Bryant Commercial Single Package Rooftop Gas Heat Electric Cooling 581B Users Manual

COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B a423d268-d56d-4b50-91fa-3f5d20db01b1

581B to the manual a423d268-d56d-4b50-91fa-3f5d20db01b1

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COMMERCIAL
SINGLE PACKAGE ROOFTOP
GAS HEAT/ELECTRIC COOLING
UNITS

FEATURES/BENEFITS
• Efficient rooftop line for cooling using scroll compressor
technology
• Efficient rooftop line for heating using dimpled heat
exchangers
• High reliability — non-corrosive condensate pans, prepainted
cabinets and primed interior panels, and all units are fully
protected by internal safeties
• Quiet operation — isolated compressor plate. All compressors mounted on independent vibration isolators. Standard,
belt-driven evaporator fan motors on all units
• Ease of maintenance achieved by self diagnostics on the
Integrated Gas Controller (IGC), standard size filters, no tool
filter access, simple compressor access, permanently lubricated fan motors, optional disconnect switch, optional hinged
access panels, and optional 115-v convenience outlet
• Performance and comfort enhancing options — High-static
motors and Perfect Humidity™ dehumidification package.
BRYANT MEANS TOP QUALITY AND RELIABILITY —
Each component utilized in the DuraPac Plus series is
designed and tested for a minimum of 15 years operation
under the harshest conditions.
Every unit is thoroughly run tested at the factory in each operating mode and evacuated prior to final charging. Every coil is
leak-tested with helium particles. Automated run testing allows
accurate undisputed tests and measurements which are second to none in the industry.
Each unit contains a factory printout indicating tested pressures, amperages, dates, and inspectors, providing certification of the unit’s status at the time of manufacture.
Units are equipped with valuable safety controls designed to
monitor and protect for the life of the unit. The standard safeties include:
• low-pressure/loss-of-charge switch

3 to 121/2 Tons

Unit 581B090-150

Unit 581B036-072
Bryant has designed the DuraPac Plus series based on
customer needs and requests to be the most efficient and reliable ever.

Model 581B
DuraPac Plus Series
Sizes 036-150

•
•
•
•

high-pressure switch
freeze-protection thermostat
internal compressor overload
exclusive Cycle-LOC™ circuit board that prevents compressor cycling
• refrigerant filter drier
The cabinet is constructed of galvanized steel, bonderized and
coated with a prepainted baked enamel finish. The paint finish
is a non-chalking type, and is capable of exceeding Federal
Test Method Standard No. 141 (Method 6061) 500-Hour Salt
Spray Test. In addition, all cabinet interior surfaces are primed,
allowing the entire unit to have a longer life and more attractive
appearance.
EASY MAINTENANCE AND INSTALLATION
All Units are Factory Shipped in the Vertical Discharge
Configuration for fit-up to standard roof curbs. (One accessory curb fits sizes 036-072; another accessory curb fits
sizes 090-150.) Contractors can order and install the roof curbs
early in the construction stage, before decisions on size
requirements have been made.
All Units Feature Heavy-Gage Roll-Formed Baserail design
with forklift slots on 3 sides of the unit and rigging holes for
easier maneuvering and installation. Stretch-wrap packaging
protects the unit during shipment and storage.
Units are Easily Converted from vertical to horizontal applications to make retrofit and add-on jobs easier. To convert from
vertical to horizontal discharge, simply relocate 2 panels. The
same basic unit can be used for a variety of applications and
can be quickly modified at the jobsite.
Standard high-performance, belt-driven, evaporator-fan motors
enable 581B036-150 units to operate in most ductwork
configurations.
Ductwork Connections are Made Easy by the logical 2 to 1
aspect ratio. On vertical discharge units, ductwork attaches
directly to the roof curb.

Form No. PDS 581B.36.5

FEATURES/BENEFITS (cont)
FACTORY-INSTALLED
OPTIONAL
DISCONNECT SWITCH

FACTORY-INSTALLED
OPTIONAL
CONVENIENCE OUTLET

SINGLE PIECE
TOP PANEL

REFRIGERATION
SYSTEM
PROTECTION

PREMIUM QUALITY
SCROLL COMPRESSORS

BALL BEARING, PERMANENTLYLUBRICATED MOTORS

DIMPLED HEAT
EXCHANGERS

NO TOOL
FILTER ACCESS

BELT DRIVEN
EVAPORATOR FANS

SLEEVE BEARING PERMANENTLYLUBRICATED MOTORS

ON-SITE CONVERTIBILITY
FROM VERTICAL TO
HORIZONTAL DISCHARGE

HIGH-EFFICIENCY
COILS AND
FIXED ORIFICE
REFRIGERANT
METERING DEVICE

SLOPED,
NON-CORROSIVE
CONDENSATE
DRAIN PAN

HIGH-EFFICIENCY COILS
FULLY MODULATING
ECONOMIZER (OPTION OR ACCESSORY)

2

FEATURES/BENEFITS (cont)
Thru-the-Bottom Service Connection Capability comes
standard with the rooftop unit to allow power and control wiring
to be routed through the unit’s basepan, thereby minimizing roof
penetrations (to prevent water leaks). Both power and control
connections are made on the same side of the unit to simplify
installation.
The Non-Corrosive, Sloped, Condensate Drain Pan is
standard and in conformance with ASHRAE (American Society
of Heating, Refrigeration, and Air Conditioning Engineers)
Standard 62 to meet many Indoor Air Quality (IAQ) specifications. The condensate drain pan offers both bottom and end
drain capability to minimize roof penetrations. The bottom drain
can be used in conjunction with thru-the-bottom connections.
An external trap must be field supplied.
Standard 2-in. Throwaway Filters are easily accessed
through an easily removable filter access panel located directly
above the air intake hood; no tools are required to change the
filters.
All Units are Designed with a Single Continuous Top Piece
to eliminate leaking at the seams or gasketing, which tends to
deteriorate over time and shift during rigging procedures.
Belt-Driven Evaporator-Fan Motors allow maximum on-site
flexibility without changing motors or drives.
Low-Voltage Wiring Connections are easily made due to the
large terminal board which is conveniently located for quick,
simple access.
QUIET, EFFICIENT OPERATION AND DEPENDABLE
PERFORMANCE
All Units are Equipped With Scroll Compressors which are
fully hermetic with internal vibration isolators for extremely quiet
operation. The scroll compressors are quieter and more reliable
than reciprocating designs. Compressors are mounted on an
independent plate for additional sound integrity and structural
support. Efficient condenser fan and motor design permits
operation at low sound levels.
Totally Enclosed Condenser-Fan Motors and permanently
lubricated bearings provide additional dependability.
All Coils Use State-of-the-Art Internally Enhanced Copper
Tubing — Coils are thoroughly tested with helium particles as
well as pressure tested at the factory. Condenser coils have louvered, aluminum lanced fins to provide maximum heat transfer
for optimum efficiency and easy cleaning.
Exclusive Dimpled Heat Exchangers optimize heat transfer
for improved efficiency. The tubular design permits hot gases to
make multiple passes across the path of the supply air. In addition, dimpled heat exchanger tubes act as baffles, forcing the
hot gases to stay in close contact with the cell walls to maximize
heat transfer and efficiency.
The California Air Quality Management NOx requirement of
40 nanograms/joule or less is met with Low kit NOx models in
036-060 sizes.
The Induced Draft Combustion System eliminates the
unsightly appearance of flue stacks, and diminishes the effects
of winds on heating operation. The inducer fan draws hot combustion gas through the heat exchanger at the optimum rate for
the most effective heat transfer. The induced draft (negative
pressure) also prevents contaminants from entering the supply
air if a leak in the heat exchanger occurs.
The Direct Spark Ignition System saves operating expense
when compared to old-style pilot ignition systems. No crossover
tube is required, therefore no sooting or pilot fouling problems
can occur.

LP (Liquid Propane) Conversion Kit — Standard units are
designed for natural gas. An LP Conversion Kit is available as
an accessory, if required. Installation of the accessory LP kit
simply involves changing the gas orifices to accommodate liquid propane gas.
Refrigerant Circuit Protection assures dependability. All units
have standard:
1) loss-of-charge/low-pressure protection switch which allows
operation at lower ambient conditions while protecting
against low-charge operation
2) freeze-protection thermostat, which protects against evaporator coil frost build-up
3) high-pressure switch, which protects against above normal
operating pressure
4) filter driers, which trap moisture and debris in the refrigeration system.
5) Bryant’s exclusive fixed orifice metering device, which precisely controls refrigerant flow, preventing slugging and
floodback, while maintaining optimum unit performance by
metering the circuits individually.
Two Independent Compressor Circuits (all 71/2 to 121/2 ton
units) provide pinpoint comfort control, improved efficiency, and
back-up capability.
The Standard Control System is readily adaptable to all conventional thermostats.
Integrated Gas Unit Controller (IGC) — All ignition components are contained in the compact Integrated Gas Controller
(IGC) that is easily accessible for service. The IGC provides
built in diagnostic capabilities. An LED simplifies troubleshooting by providing visual fault notification and system status information. The IGC board provides exclusive anti-cycle protection
for its gas heat operation. The IGC also contains burner control
logic for dependable heating operation. The LED is visible without removing the unit control box access panel. The 581B units
maximize heating efficiency through the IGC’s control of evaporator fan ON/OFF delays. The IGC helps make 581B units reliable for many years.
Patented Cycle-LOC™ Protection System provides protection against compressor cycling by monitoring compressor current draw. When lack of compressor current exists, the CycleLOC circuit board locks out the compressors. The Cycle-LOC
board may be manually reset by simply switching thermostat to
OFF, and then back to the Cooling or AUTO modes. No manipulation of the unit disconnect switch is needed.

TABLE OF CONTENTS
Page
Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . 4
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-12
Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13,14
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,16
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-44
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45-48
Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49-53
Typical Piping and Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .55-57
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58,59
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60-62

3

FEATURES/BENEFITS (cont)
Easily Accessible Refrigerant Access Ports on all discharge,
suction, and liquid lines permit easy and accurate measurements as well as simple accessibility.
Resettable 24-v Circuit Breaker On 581B090-150 Units
allows room for error without replacing transformers or fuses.
Single-Side Utility Connections provide easy access to perform any necessary service.
Color-Coded Wires permit easy tracing and diagnostics.
Belt-Driven Motors are accessible through a single access
door to facilitate servicing and adjusting after installation.
Compressors and Safety Switches are Easily Accessible for
troubleshooting and system analysis.

INDOOR AIR QUALITY (IAQ)
The Quality of Building Air is Improved as the DuraPac Plus
series utilizes certain key features that assist in improving
indoor air quality. A sloped condensate pan eliminates possible
biological growth in the rooftop unit. A face-split evaporator coil
(090-150 sizes) design proves effective in removing additional
moisture from the supply air. Two-in. filters are standard in all
rooftop units and an optional filter status sensor is available.
SERVICEABILITY
Standardized Components for the complete DuraPac Plus
line of products are found in all safety devices, condenser-fan
motors, evaporator-fan motors, and control boards, while the
gas sections use common inducer motors, limit switches, and
rollout switches. This allows for greater inventory control, familiarity of parts, and fewer stocked parts.

MODEL NUMBER NOMENCLATURE
581B

E

V

090

180

Voltage Designation
E – 460-3-60
J – 208/230-1-60
P – 208/230-3-60
T – 575-3-60

N – Low NOx Units

Fuel and Control Type
V – Natural Gas/Direct
Spark Ignition
–
–
–
–

AA
Factory-Installed Options*

581B – Single Package
High-Efficiency
Gas/Electric Unit

Nominal Tons
036 – 3
090
048 – 4
102
060 – 5
120
072 – 6
150

N

Gas Heat Input (Btuh)
072 – 72,000 180 – 180,000
115 – 115,000 220 – 224,000
125 – 125,000 250 – 250,000
150 – 150,000
Low NOx*
California Compliant 3 Phase
060N – 60,000 071 – 72,000
090N – 90,000 114 – 115,000
120N – 120,000 149 – 150,000

7-1/2
8-1/2
10
12-1/2

*Refer to the Trade Prices for ordering codes of factory-installed options.

4

ARI* CAPACITIES

dB
EER
IPLV
SEER

UNIT
581B
036
048
060
072
090
102
120
150

NOMINAL
TONS
3
4
5
6
71/2
81/2
10
121/2

STANDARD
CFM
1200
1450
1750
2100
3000
3000
3200
4300

—
—
—
—

LEGEND
Decibels
Energy Efficiency Ratio
Integrated Part-Load Value
Seasonal Energy Efficiency Ratio

COOLING
(Btuh)
36,000
47,000
60,000
74,000
90,000
102,000
120,000
140,000

TOTAL
kW
3.21
4.25
5.55
6.70
8.18
9.44
10.91
14.04

SEER†

EER

13.00
13.00
13.00
—
—
—
—
—

11.20
11.05
11.00
11.00
11.00
10.80
11.00
9.50

SOUND RATING
(dB)
76
76
80
80
82
82
84
86

IPLV**
—
—
—
—
11.6
10.9
9.7
9.8

2. Ratings are net values, reflecting the effects of circulating fan heat. Ratings are
based on:
Cooling Standard: 80 F db, 67 wb indoor entering-air temperature and 95 F
db outdoor entering-air temperature.
IPLV Standard: 80 F db, 67 F wb indoor entering-air temperature and 80 F
db outdoor entering-air temperature.

*Air-Conditioning & Refrigeration Institute.
†Applies only to units with capacity of 65,000 Btuh or less.
**The IPLV is not applicable to single-compressor units.
NOTES:
1. Rated in accordance with ARI Standard 210/240 (size 036-120 units) or 360
(size 150 units) and 270 (size 036-150 units).

Sizes 036-120 Only

Size 150 Only

HEATING CAPACITIES AND EFFICIENCIES
SIZE
581B
036071*
036072†
036114*
036115†
036060N**
036090N**
048071*
048072†
048114*
048115†
048149*
048150†
048060N**
048090N**
048120N**
060071*
060072†
060114*
060115†
060149*
060150†
060060N**
060090N**
060120N**
072072
072115
072150
090125
090180
090224
102125
102180
102224
120180
120224
120250
150224
150250

HEATING INPUT (Btuh)
Stage 2/Stage 1
—/ 72,000
72,000/ 50,000
—/115,000
115,000/ 82,000
—/ 60,000
— 90,000
—/ 72,000
72,000/ 50,000
—/115,000
115,000/ 82,000
—/150,000
150,000/120,000
—/ 60,000
—/ 90,000
—/120,000
—/ 72,000
72,000/ 50,000
—/115,000
115,000/82,000
—/150,000
150,000/120,000
—/ 60,000
—/ 90,000
—/120,000
72,000/ 50,000
115,000/ 82,000
150,000/120,000
125,000/ 90,000
180,000/120,000
224,000/180,000
125,000/ 90,000
180,000/120,000
224,000/180,000
180,000/120,000
224,000/180,000
250,000/200,000
224,000/180,000
250,000/200,000

OUTPUT CAPACITY
(Btuh)
—/ 59,040
59,040/ 41,000
—/ 92,000
92,000/ 65,600
—/ 50,000
—/ 74,000
—/ 59,040
59,040/ 41,000
—/ 92,000
93,150/ 66,420
—/120,000
120,000/ 96,000
—/ 50,000
—/ 74,000
—/101,000
—/ 59,040
59,040/ 41,000
—/ 93,150
93,150/ 66,420
—/120,000
120,000/ 96,000
—/ 50,000
—/ 74,000
—/101,000
59,040/ 41,000
93,150/ 66,420
120,000/ 96,000
102,500/ 72,900
147,600/ 98,400
183,700/147,600
102,500/ 72,900
147,600/ 98,400
183,700/147,600
147,600/ 98,400
183,700/147,600
200,000/160,000
183,700/147,600
200,000/160,000

LEGEND
AFUE — Annual Fuel Utilization Efficiency
*California rated three-phase models.
†Three-phase standard models have heating input values as shown. Single-phase standard models
have one-stage heating with heating input values as follows:
581BJV036-060072, 72,000 Btuh
581BJV036-060115, 115,000 Btuh
581BJV048-060150, 150,000 Btuh
**California SCAQMD compliant Low NOx models have combustion products that are controlled to
40 nanograms per joule or less.

5

TEMPERATURE
RISE
15-45
15-45
55-85
55-85
20-50
30-60
15-45
15-45
35-65
35-65
50-80
50-80
20-50
30-60
40-70
15-45
15-45
35-65
35-65
50-80
50-80
20-50
30-60
40-70
15-45
35-65
50-80
20-50
35-65
45-75
20-50
35-65
45-75
35-65
45-75
40-70
45-75
40-70

AFUE
(%)
82
82
80
80
81
81
82
82
81
81
80
80
81
81
82
82
82
81
81
80
80
81
81
82
82
81
80
82
82
82
82
82
82
82
82
80
82
80

STEADY-STAGE
EFFICIENCY (%)
82
82
80
82
81
81
82
82
81
81
80
80
81
81
82
82
82
81
81
80
80
81
81
82
82
81
80
82
82
82
82
82
82
82
82
80
82
80

OPTIONS AND ACCESSORIES
ITEM
Perfect Humidity™ Dehumidification Package
Integrated Economizer — Durablade
Integrated Economizer — EconoMi$er (gear driven)
EconoMi$er with Power Exhaust (Vertical Only)
Power Exhaust for EconoMi$er
High-Static Motor (except 150)
Hinged Access Panels
25% Manual Outdoor-Air Damper
50% Manual Outdoor-Air Damper
Convenience Outlet
Unit Mounted Disconnect
Two-Position Damper (25% Open)
Two-Position Damper (100% Open)
Roof Curb (14 in.)
Roof Curb (24 in.)
Thru-the-Bottom Service Connections
Thermostat and Subbase
Light Commercial Thermostat
Light Commercial Thermidistat
Time Guard® II Control Circuit (3-Phase Units Only)
Motormaster® Low Ambient Control
Motormaster II Low Ambient Control
Motormaster IV Low Ambient Control
Accusensor™ II Enthalpy Control
Accusensor III Differential Enthalpy Sensor
Liquid Propane Conversion Kit
Flue Discharge Deflector
Flue-Hood Protector Assembly
Coil Guard Grille
Condenser Coil Hail Guard
Fan/Filter Status Switch
Corrosion Resistant Coils

OPTION*
X
X
X

ACCESSORY†

X
X
X

X
X
X
X

X
X

X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X

*Indicates a factory-installed option.
†Indicates a field-installed accessory.

LOW AMBIENT CONTROLS

LIQUID PROPANE CONVERSION KIT

The 581B036-150 standard units are designed to operate in cooling at outdoor temperatures
down to 25 F. With accessory Motormaster control (condenser-fan speed modulation), or Motormaster II control (condenser-fan cycling), units can operate at outdoor temperatures down to
–20 F. The head pressure controls, which mount in the condenser section, control the
condenser-fan motor to maintain correct condensing temperature.

BURNER SPUDS
(ORIFICES)

MOTORMASTER I
MOTORMASTER II

TIME GUARD II CONTROL
Time Guard II Control automatically prevents compressor
from restarting for at least 5 minutes after a shutdown.
Field-installed accessory prevents short cycling of compressor if thermostat is rapidly changed. Time Guard II
device mounts in the control compartment of unit. The
Time Guard II device is not required when a programmable thermostat is applied.

6

Liquid propane conversion kit allows
the unit to utilize a liquid propane fuel
supply in areas where natural gas is
not available. (Kit shown is for
sizes 036-072.)

OPTIONS AND ACCESSORIES (cont)
UNIT MOUNTED DISCONNECT

ECONOMI$ER
ECONOMI$ER
PLUG

CONTROLLER

GEAR-DRIVEN
DAMPER

ACTUATOR

OUTDOOR AIR
TEMPERATURE
SENSOR

BAROMETRIC
RELIEF DAMPERS

Factory-installed, internally-mounted, NEC (National Electrical
Code) and UL (Underwriters’ Laboratories) approved non-fused
switch provides unit power shutoff with disconnect lockout protection
capability. The switch is accessible from outside the unit.

Factory-installed EconoMi$er utilizes a microprocessor-based control, gear drive damper system, low pressure drop characteristics,
built-in spring return (for close upon power loss), and an integral
barometric damper.
NOTE: EconoMi$er is only available for vertical ductwork applications and can be field or factory installed.

CONVENIENCE OUTLET
DURABLADE ECONOMIZER

Factory-installed, internally mounted and externally accessible 115-v
female receptacle. Includes 15-amp GFI (Ground Fault Interrupter)
receptacle with independent fuse protection. Voltage required to
operate convenience outlet is provided by a factory-installed
transformer.

Exclusive Durablade economizer damper design saves energy while
providing economical and reliable cooling. A sliding plate on the face
of the economizer controls the amount of outdoor air entering the
system. When the sliding plate is closed, it provides a leakproof seal
which prevents ambient air from seeping in or conditioned air from
seeping out. It can be easily adjusted for 100% outdoor air or any
proportions of mixed air. Equipped with standard controls and 30%
barometric relief capabilities.

PERFECT HUMIDITY™ DEHUMIDIFICATION PACKAGE
The Perfect Humidity dehumidification package is a factory-installed option
that provides increased dehumidification by cooling the hot liquid refrigerant
leaving the condenser coil. The package consists of a subcooling coil
located on the leaving-air side of the evaporator coil. The location of this coil
in the indoor-air stream enhances the latent capacity of the 581B units by
as much as 40%. The Perfect Humidity package includes crankcase
heater(s) and low-pressure switch(es) and operation can be controlled by a
field-installed, wall-mounted humidistat or light commercial thermidistat.

7

OPTIONS AND ACCESSORIES (cont)
HAIL GUARD

ACCUSENSOR™ II ENTHALPY CONTROL

B

REV. B

SO

D

TR

198818A

C

S

1

P

T

MINIMUM 3
POSITION

OPEN

5

4

2

P1

T1

TR

C

24VAC

2

TR1

1

3 mA MIN. AT 11 VDC

B A

ENTHALPY CONTROL

3

D

CW–SETPOINTS–CCW

RUSH AT 24VAC

CONTACTS SHOWN IN HIGH ENTHALPY
OR UNPOWERED STATE

°F

CONTACT RATINGS: 1.5A RUN, 3.5A IN

OUTDOOR TEMP.

% 90
H
DAMPER
U 70
CLOSED
M
I 60
DAMPER
D
OPEN
I 30
T
Y 10
50 55 60 65 70 75 80 85
97-3672

REV.

Hail guard accessory (field installed) protects condenser coils
against damage from hail and other flying debris.

ACCUSENSOR III DIFFERENTIAL ENTHALPY
COIL GUARD GRILLE

+

Coil guard grille protects coils against large objects and
vandalism.

Accusensor economizer controls help provide efficient, economical
economizer operation. The Accusensor I dry-bulb sensor measures outdoor temperature and is standard with the Durablade economizer.
The accessory Accusensor II solid-state enthalpy control senses both
dry and wet bulb of the outdoor air to provide an accurate enthalpy reading. Accusensor II control is available as a field-installed accessory for
the Durablade economizer.
The accessory Accusensor III differential enthalpy sensor control compares outdoor temperature and humidity to return-air temperature and
humidity and determines the most economical mixture of air. Accusensor III is available for Durablade economizers.

BRYANT COMMERCIAL PROGRAMMABLE THERMOSTAT
Designed specifically for use with Bryant commercial systems, this Bryant
programmable thermostat features LED occupied/unoccupied displays and
setback mode which can override continuous fan operation.

BRYANT LIGHT COMMERCIAL THERMIDISTAT
The light commercial thermidistat combines temperature and dehumidification control in one device and provides continuous fan operation in occupied
mode. Recommended for use with the Perfect Humidity™ package.

8

PHYSICAL DATA
UNIT SIZE 581B
NOMINAL CAPACITY
OPERATING WEIGHT (lb)
Unit
With Durablade Economizer
With EconoMi$er
With Perfect Humidity™ Dehumidification Package
Roof Curb
COMPRESSOR
Quantity
Oil (oz)
REFRIGERANT TYPE
Operating Charge (lb-oz)
Standard Unit
Unit With Perfect Humidity Dehumidification Package
CONDENSER FAN
Quantity...Diameter (in.)
Nominal Cfm
Motor Hp...Rpm
Watts Input (Total)
CONDENSER COIL
Standard Unit
Rows...Fins/in.
Total Face Area (sq ft)
Unit with Perfect Humidity Dehumidification Package
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Nominal Cfm
Maximum Continuous Bhp
Std
Hi-Static
Motor Frame Size
Std
Hi-Static
Fan Rpm Range
Std
Hi-Static
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter
Std
A/B (in.)
Hi-Static
Nominal Motor Shaft Diameter (in.)
Std
Hi-Static
Fan Pulley Pitch Diameter (in.)
Std
Hi-Static
Belt — Type...Length (in.)
Std
Hi-Static
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Std
Movable Pulley Flange (rpm)
Hi-Static
Movable Pulley Maximum Full
Std
Turns from Closed Position
Hi-Static
Factory Setting — Full Turns Open
Std
Hi-Static
Factory Speed Setting (rpm)
Std
Hi-Static
Fan Shaft Diameter at Pulley (in.)
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)

036
3

048
4

060
5

072
6

530
564
577
548
115

540
574
587
558
115

560
594
607
578
115

615
649
662
633
115

1
42

1
53

1
50

1
60

10- 0
12-13

9-10
13- 6

Scroll

R-22
5- 8
8-13

8-6
11-2

Propeller
1...22
1...22
3500
4100
1/4...825
1/4...1100
180
320
Enhanced Copper Tubes, Aluminum Lanced Fins

1...22
3500
1/4...825
180

1...17
14.6

2...17
16.5

1...17
3.9

1...17
3.9

2...17
16.5

1...22
4100
1/4...1100
320

2...17
16.5

1...17
1...17
3.9
3.9
Centrifugal Type, Belt Drive
1...10 x 10
1...10 x 10
1...10 x 10
1...10 x 10
1200
1600
2000
2400
1.20
1.20
1.30/2.40*
2.40
2.40
2.40
2.90
2.90
48
48
48/56*
56
56
56
56
56
760-1090
840-1185
1020-1460/1120-1585*
1120-1585
1075-1455
1075-1455
1300-1685
1300-1685
Ball
Ball
Ball
Ball
2100
2100
2100
2100
1.9/2.9
1.9/2.0
2.4/3.4
2.4/3.4
2.8/3.8
2.8/3.8
3.4/4.4
3.4/3.4
1/ 2
1/2
5/8
5/ 8
5/ 8
5/8
5/8
5/ 8
4.5
4.0
4.0
4.0
4.5
4.0
4.5
4.5
1...A...33
1...A...33
1....4...40
1...A...38
1...A...39
1...A...39
1...A...40
1...A...40
10.0-12.4
10.0-12.4
14.7-15.5
14.7-15.5
65
70
75
95
65
65
60
60
5
5
6
5
6
6
5
5
3
3
3
3
3 1/ 2
3 1/ 2
31/2
31/2
890
980
1240
1304
1233
1233
1396
1396
5/ 8
5/8
5/8
5/ 8
Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Fixed Orifice Metering Device
2...15
2...15
4...15
4...15
5.5
5.5
5.5
5.5

LEGEND
Bhp — Brake Horsepower

***Three-phase standard models have heating inputs as shown. Singlephase standard models have one-stage heating with heating input values
as follows:
581BJV036-060072, 72,000 Btuh
581BJV036-060115, 115,000 Btuh
581BJV048-060150, 150,000 Btuh
†††California SCAQMD compliant Low NOx models have combustion products that are controlled to 40 nanograms per joule or less.

*Single phase/three phase.
†Indicates automatic reset.
**581B 072 unit size 036-072 (72,000 Btu heat input) have 2 burners.
581B 115 unit size 036-072 (115,000 Btu heat input) have 3 burners.
581B 150 unit size 048-072 (150,000 Btu heat input) have 3 burners.
††An LP kit is available as an accessory.
llCalifornia compliant three-phase models.

9

PHYSICAL DATA (cont)
UNIT SIZE 581B
FURNACE SECTION
Rollout Switch Cutout Temp (F)†
Burner Orifice Diameter (in. ...drill size)**
Natural Gas — Std

Liquid Propane — Alt††

Thermostat Heat Anticipator Setting (amps)
(208/230/460/575 V)
Gas Input (Btuh)
First Stage/Second Stage

Efficiency (Thermal) (%)

Temperature Rise Range

071/072
114/115
149/150
060N
090N
120N
071/072
114/115
149/150
060N
090N
120N

071II
114II
149II
072***
115***
150***
060N†††
090N†††
120N†††
071
114
149
072
115
150
060N
090N
120N
071
114
149
072
115
150
060N
090N
120N

Manifold Pressure (in. wg)
Natural Gas — Std
Liquid Propane — Alt††
Maximum Static Pressure (in. wg)
Field Gas Connection Size (in.)
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
Cutout
Reset (Auto.)
LOSS-OF-CHARGE SWITCH/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT
Opens (F)
Closes (F)
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.)

036

048

060

072

195

195

195

195

.113...33
.113...33
—
.102...38
.102...38
—
.089...43
.089...43
—
.082...45
.082...45
—

.113...33
.113...33
.129...30
.102...38
.102...38
.116...32
.089...43
.089...43
.102...38
.082...45
.082...45
.094...42

.113...33
.113...33
.129...30
.102...38
.102...38
.116...32
.089...43
.089...43
.102...38
.082...45
.082...45
.094...42

.113...33
.113...33
.129...30
—
—
—
.089...43
.089...43
.102...38
—
—
—

.14

.14

.14

.14

—/ 72,000
—/115,000
—
50,000/ 72,000
82,000/115,000
—
—/ 60,000
—/ 90,000
—
82
80
—
82
80
—
81
81
—
15-45
55-85
—
15-45
55-85
—
20-50
30-60
—

—/ 72,000
—/115,000
—/150,000
50,000/ 72,000
82,000/115,000
120,000/150,000
—/ 60,000
—/ 90,000
—/120,000
82
81
80
82
81
80
81
81
82
15-45
35-65
50-80
15-45
35-65
50-80
20-50
30-60
40-70

—/ 72,000
—/115,000
—/150,000
50,000/ 72,000
82,000/115,000
120,000/150,000
—/ 60,000
—/ 90,000
—/120,000
82
81
80
82
81
80
81
81
82
15-45
35-65
50-80
15-45
35-65
50-80
20-50
30-60
40-70

—
—
—
50,000/ 72,000
82,000/115,000
120,000/150,000
—
—
—
—
—
—
82
81
80
—
—
—
—
—
—
15-45
35-65
50-80
—
—
—

3.5
3.5
1.0
1/2

3.5
3.5
1.0
1/2

3.5
3.5
1.0
1/2

3.5
3.5
1.0
1/ 2

450 ± 50
428
320

7±3
22 ± 5
30 ± 5
45 ± 5
Cleanable
1...20 x 24 x 1
Throwaway
2...16 x 25 x 2

LEGEND
Bhp — Brake Horsepower

***Three-phase standard models have heating inputs as shown. Singlephase standard models have one-stage heating with heating input values
as follows:
581BJV036-060072, 72,000 Btuh
581BJV036-060115, 115,000 Btuh
581BJV048-060150, 150,000 Btuh
†††California SCAQMD compliant Low NOx models have combustion products that are controlled to 40 nanograms per joule or less.

*Single phase/three phase.
†Indicates automatic reset.
**581B 072 unit size 036-072 (72,000 Btu heat input) have 2 burners.
581B 115 unit size 036-072 (115,000 Btu heat input) have 3 burners.
581B 150 unit size 048-072 (150,000 Btu heat input) have 3 burners.
††An LP kit is available as an accessory.
llCalifornia compliant three-phase models.

10

PHYSICAL DATA (cont)
UNIT SIZE 581B
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Unit
With Durablade Economizer
With EconoMi$er
With Perfect Humidity™ Dehumidification Package
Roof Curb*
COMPRESSOR
Quantity
Oil (oz) (each compressor)
REFRIGERANT TYPE
Operating Charge (lb-oz)
Standard Unit
Circuit 1
Circuit 2
Unit With Perfect Humidity Dehumidification
Package
Circuit 1
Circuit 2
CONDENSER FAN
Quantity...Diameter (in.)
Nominal Cfm
Motor Hp...Rpm
Watts Input (Total)
CONDENSER COIL
Standard Unit
Rows...Fins/in.
Total Face Area (sq ft)
Unit with Perfect Humidity Dehumidification
Package
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Size (in.)
Type Drive
Nominal Cfm
Maximum Continuous Bhp
Std
Hi-Static
Motor Frame
Fan Rpm Range
Std
Hi-Static
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter
Std
A/B (in.)
Hi-Static
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Std
Hi-Static
Belt — Type...Length (in.)
Std
Hi-Static
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Std
Movable Pulley Flange (rpm)
Hi-Static
Movable Pulley Maximum Full
Std
Turns from Closed Position
Hi-Static
Factory Setting — Full Turns Open
Std
Hi-Static
Factory Speed Setting (rpm)
Std
Hi-Static
Fan Shaft Diameter at Pulley (in.)
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)

090
7 1/ 2

102
8 1/ 2

120
10

150
121/2

870
914
932
899
143

880
924
942
909
143

1035
1079
1097
1068
143

1050
1094
1112
1083
143

2
53

2
53

2
50

2
60

Scroll

R-22
7-10
8- 2

7-14
8- 5

9-10
10-10

9-8
9-5

10-10
12- 8

10-11
10-10

13- 0
13- 5

12-6
12-2

2...22
6500
1/4...1100
650

Propeller
2...22
2...22
6500
7000
1/4...1100
1/4...1100
650
650
Enhanced Copper Tubes, Aluminum Lanced Fins

2...22
7000
1/4...1100

650

2...17
20.5

2...17
20.5

2...17
25.0

2...17
25.0

1...17
6.3

1...17
6.3

1...17
8.4

1...17
8.4

15 x 15
Belt
3000
2.90
4.20
56
840-1085
860-1080
Ball
2100
3.4/4.4
4.0/5.0
7/8
7.0
8.0
A...51
A...55
16.75-19.25
50
60
5
5
5
5
840
860
1
3...15
8.9

Centrifugal
15 x 15
15 x 15
Belt
Belt
3400
4000
2.90
3.70
4.20
5.25
56
56
840-1085
860-1080
860-1080
830-1130
Ball
Ball
2100
2100
3.4/4.4
4.0/5.0
4.0/5.0
2.8/3.8
7/8
7/8
7.0
8.0
8.0
5.8
A...51
A...51
A...55
BX...46
16.75-19.25
15.85-17.50
50
45
60
60
5
5
5
6
5
5
5
5
840
860
860
890
1
1
Enhanced Copper Tubes, Aluminum Double-Wavy Fins
3...15
4...15
8.9
11.1

15 x 15
Belt
5000
5.25
—
56
900-1260
—
Ball
2100
2.8/3.8
—
7/8
5.8
—
BX...46
—
15.85-17.50
60
—
6
—
5
—
960
—
1
4...15
11.1

†Rollout switch lockout is manually reset by interrupting power to unit or
resetting thermostat.
NOTE: High-static motor not available on size 150 units.

LEGEND
Bhp — Brake Horsepower
*Weight of 14-in. roof curb.

11

PHYSICAL DATA (cont)
UNIT SIZE 581B
FURNACE SECTION
Rollout Switch Cutout Temp†
Burner Orifice Diameter
(in. ...drill size)
Natural Gas
Std
Liquid Propane

Accy

Thermostat Heat Anticipator
Setting (amps)
208/230 v and 575 Stage 1
Stage 2
460 v
Stage 1
Stage 2
Gas Input (Btuh)Stage1/Stage 2

HEAT

090

102

120

150

195

195

195

195

Lo
Med
Hi
Lo
Med
Hi

.120...31
.120...31
.120...31
.096...41
.096...41
.096...41

.120...31
.120...31
.120...31
.096...41
.096...41
.096...41

.120...31
.120...31
.129...30
.096...41
.096...41
.102...38

.120...31
.129...30
—
.096...41
.102...38
—

Lo
Med
Hi

.14
.20
.14
.20
125,000/—
120,000/180,000
180,000/224,000

.14
.20
.14
.20
125,000/—
120,000/180,000
180,000/224,000

Lo
Med
Hi

82
20-50
35-65
45-75

82
20-50
35-65
45-75

.14
.20
.14
.20
120,000/180,000
180,000/224,000
200,000/250,000
82, 80 (in 250,000 Btuh
heat range)
35-65
35-65
40-70

.14
.20
.14
.20
180,000/224,000
200,000/250,000
—/—
82, 80 (in 250,000 Btuh
heat range)
35-65
40-70
—

3.5
3.5
1

3.5
3.5
1

3.5
3.5
1

3.5
3.5
1

0.180-0.487
5.0-13.5

0.180-0.487
5.0-13.5

0.180-0.487
5.0-13.5

0.180-0.487
5.0-13.5

1/2

1/2

3/4

3/4

3/4

3/4

3/4

3/4

3/4

3/4

3/4

—

Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
Std
Liquid Propane
Accy
Gas Valve Quantity
Gas Valve Pressure Range
Psig
in. wg
Field Gas Connection
Size (in.)

Lo
Med
Hi

HIGH-PRESSURE SWITCH (psig)
Standard Compressor
Internal Relief (Differential)
Cutout
Reset (Auto.)
LOSS-OF-CHARGE (LOW-PRESSURE)
SWITCH (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION
THERMOSTAT (F)
Opens
Closes
OUTDOOR-AIR INLET SCREENS

450 ± 50

500 ± 50

428
320

428
320

7±3
22 ± 7

Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.)

4...16 x 20 x 2

4...16 x 20 x 2

30 ± 5
45 ± 5
Cleanable
1...20 x 24 x 1
1...16 x 25 x 1
Throwaway
4...20 x 20 x 2

4...20 x 20 x 2

†Rollout switch lockout is manually reset by interrupting power to unit or
resetting thermostat.
NOTE: High-static motor not available on size 150 units.

LEGEND
Bhp — Brake Horsepower
*Weight of 14-in. roof curb.

12

BASE UNIT DIMENSIONS

UNIT
581B
036
048
060
072

A
B
C
D
E
F
G

STANDARD
UNIT
WEIGHT
Lb
Kg
530
240
540
245
560
254
615
279

DURABLADE
ECONOMIZER
WEIGHT
Lb
Kg
34
15.4
34
15.4
34
15.4
34
15.4

ECONOMI$ER
WEIGHT
Lb
47
47
47
47

CONNECTION SIZES
13/8″ Dia [35] Field Power Supply Hole
2″″ Dia [51] Power Supply Knockout
13/4″ Dia [44] Charging Port Hole
7/8″ Dia [22] Field Control Wiring Hole
3/4″-14 NPT Condensate Drain
1/2″-14 NPT Gas Connection
21/2″ Dia [64] Power Supply Knockout

Kg
21.3
21.3
21.3
21.3

CORNER
WEIGHT
(A)
Lb
Kg
127 57.6
129 58.5
134 60.8
147 66.7

CORNER
WEIGHT
(B)
Lb
Kg
122 55.3
124 56.2
129 58.5
142 64.4

CORNER
WEIGHT
(C)
Lb
Kg
138 62.6
141 64.0
146 66.2
160 72.6

CORNER
WEIGHT
(D)
Lb
Kg
143 64.9
146 66.2
151 68.5
166 75.3

BOTTOM POWER CHART, THESE HOLES REQUIRED FOR
USE WITH ACCESSORY PACKAGES — CRBTMPWR001A00,
3A00 (1/2″, 3/4″) OR CRBTMPWR002A00, 4A00 (1/2″, 11/4″)
THREADED
CONDUIT SIZE
1/2″
3/4″
11/4″
(003) 1/2″ FPT
(004) 3/4″ FPT

WIRE
USE
24 V
Power*
Power*
Gas
Gas

REQURED
HOLE SIZES (MAX.)
7/8″ [22.2]
11/8″ [28.4]
13/4″ [44.4]
11/4″ [31.8]
15/8″ [41.3]

*Select either 3/4″ or 11/4″ for power, depending on wire size.
NOTES:
1. Dimensions in [
2.

] are in millimeters.

Center of gravity.

3.

Direction of airflow.

4. On vertical discharge units, ductwork to be attached to accessory roof curb only. For horizontal
discharge units, field-supplied flanges should be attached to horizontal discharge openings, and
all ductwork should be attached to the flanges.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Between unit, flue side and combustible surfaces, 48 inches.
b. Bottom of unit to combustible surfaces (when not using curb), 1 inch.
Bottom of base rail to combustible surfaces (when not using curb) 0 inches.
c. Condenser coil, for proper airflow, 36 in. one side, 12 in. the other. The side getting the
greater clearance is optional.
d. Overhead, 60 in. to assure proper condenser fan operation.
e. Between units, control box side, 42 in. per NEC (National Electrical Code).
f. Between unit and ungrounded surfaces, control box side, 36 in. per NEC.
g. Between unit and block or concrete walls and other grounded surfaces, control box side,
42 in. per NEC.
h. Horizontal supply and return end, 0 inches.
6. With the exception of the clearance for the condenser coil and combustion side as stated in
notes 5a, b and c, a removable fence or barricade requires no clearance.
7. Units may be installed on combustible floors made from wood or Class A, B, or C roof covering
material if set on base rail.
8. The vertical center of gravity is 1′-6″ [457] up from the bottom of the base rail.

581B036-072

13

BASE UNIT DIMENSIONS (cont)
UNIT
581B
090
102
120
150

A
B
C
D
E
F
G

STANDARD
UNIT WEIGHT
Lb
Kg
870
880
1035
1050

395
399
469
476

DURABLADE
ECONOMIZER WEIGHT
Lb
Kg
44
44
44
44

20
20
20
20

ECONOMI$ER
WEIGHT
Lb
Kg
62
62
62
62

CONNECTION SIZES
13/8″ Dia [35] Field Power Supply Hole
21/2″ Dia [64] Power Supply Knockout
13/4″ Dia [44] Charging-Port Hole
7/8″ Dia [22] Field Control Wiring Hole
3/4″-14 NPT Condensate Drain
1/2″-14 NPT Gas Conn. — 581B090 & 102 —125 Heat
3/4″-14 NPT Gas Conn. — 581B090 to 120 — 180 Heat
581B 090 to 150 — 224 Heat, 581B120 & 150 — 250 Heat
2″ Dia [51] Power Supply Knockout

28.1
28.1
28.1
28.1

CORNER
WEIGHT (A)
Lb
Kg
189
191
225
228

86
87
102
103

CORNER
WEIGHT (B)
Lb
Kg
161
163
192
195

73
74
87
88

CORNER
WEIGHT (C)
Lb
Kg

CORNER
WEIGHT (D)
ft-in.
mm

ft-in.

mm

ft-in.

mm

ft-in.

mm

ft-in.

mm

239
242
285
289

280
284
333
338

2-07/8
1-27/8
1-27/8
1-27/8

632
378
378
378

3-55/16
3-55/16
4-15/16
4-15/16

1050
1050
1253
1253

2-911/16
2-911/16
3-03/8
3-03/8

856
856
924
924

2- 27/16
2- 27/16
2-107/16
2-107/16

672
672
875
875

109
110
129
131

BOTTOM POWER CHART, THESE HOLES
REQUIRED FOR USE WITH ACCESSORY PACKAGES —
CRBTMPWR001A00, 2A00 (1/2″, 3/4″) OR
CRBTMPWR002A00, 4A00 (1/2″, 11/4″)
THREADED
CONDUIT SIZE

WIRE
USE

1/2″

24 V

REQUIRED
HOLE SIZES (MAX.)
7/ 8″

[22.2]

3/4″

Power*

11/4″

Power*

11/8″ [28.4]
13/4″ [44.4]

(003) 1/2″ FPT

Gas

11/4″ [31.8]

(004) 3/4″ FPT

Gas

15/8″ [41.3]

*Select either 3/4″ or 11/4″ for power, depending on wire
size.

581B090-150

14

127
129
151
153

“H”

“J”

NOTES:
1. Dimensions in [
2.
3.

“K”

“L”

] are in millimeters.

Center of gravity.
Direction of airflow.

4. On vertical discharge units, ductwork to be attached to
accessory roof curb only. For horizontal discharge units,
field-supplied flanges should be attached to horizontal discharge openings, and all ductwork should be attached to the
flanges.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Between unit, flue side and combustible surfaces,
48 inches.
b. Bottom of unit to combustible surfaces (when not using
curb), 1 inch. Bottom of base rail to combustible surfaces
(when not using curb) 0 inches.
c. Condenser coil, for proper airflow, 36 in. one side, 12 in.
the other. The side getting the greater clearance is
optional.
d. Overhead, 60 in. to assure proper condenser fan
operation.
e. Between units, control box side, 42 in. per NEC (National
Electrical Code).
f. Between unit and ungrounded surfaces, control box side,
36 in. per NEC.
g. Between unit and block or concrete walls and other
grounded surfaces, control box side, 42 in. per NEC.
h. Horizontal supply and return end, 0 inches.
6. With the exception of the clearance for the condenser coil
and combustion side as stated in notes 5a, b and c, a removable fence or barricade requires no clearance.
7. Units may be installed on combustible floors made from
wood or Class A, B, or C roof covering material if set on
base rail.
8. The vertical center of gravity is 1′-7″ [483] for 090 and 102,
1′-11″ [584] for 120 and 150 up from the bottom of the base
rail.

ACCESSORY DIMENSIONS — 581B036-072
UNIT
SIZE
581B

“A”

ROOF CURB
ACCESSORY

036-072

1′-2″ [356]
2′-0″ [610]

CRRFCURB001A00
CRRFCURB002A00

UNIT SIZE
581B

B

C

D ALT
DRAIN
HOLE

“E”
GAS
3/4″
[19] NPT

036-072

1′-911/16″ 1′-4″
[551]
[406]

13/4″
[44.5]

1/2″
[12.7] NPT
3/4″
[19] NPT

“F”
POWER
3/4″

[19] NPT
11/4″ [31.7]

3/4″

[19] NPT

11/4″ [31.7]

“G”
CONTROL

CONNECTOR
PKG. ACCY.

1/2″
[12.7] NPT

CRBTMPWR001A00
CRBTMPWR002A00

1/2″
[12.7] NPT

CRBTMPWR003A00
CRBTMPWR004A00

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on curb).
6. Service clearance 4 ft on each side.
7.
Direction of airflow.
8. Connector packages CRBTMPWR001A00 and 002A00 are for thru-the-curb connections. Packages CRBTMP003A00 and 004A00 are for thru-the-bottom connections.

15

ACCESSORY DIMENSIONS — 581B090-150
CONNECTOR
PKG. ACCY.

B

C

D ALT
DRAIN
HOLE

3/4″

CRBTMPWR001A00
CRBTMPWR002A00
CRBTMPWR003A00
CRBTMPWR004A00

“E”
GAS

2′-87/16″
[827]

1′-1015/16″
[583]

13/4″
[44.5]

[19] NPT
1/2″
[12.7] NPT
3/4″
[19] NPT

“F”
POWER
3/4″

[19] NPT)
11/4″ [31.7]

3/4″

[19] NPT

11/4″ [31.7]

“G”
CONTROL
1/2″

[12.7]
1/2″
[12.7]

ROOF CURB
ACCESSORY
CRRFCURB003A00
CRRFCURB004A00

“A”

UNIT SIZE
581B

1′-2″ [356]
2′-0″ [610]

090-150

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1-in. thick polyurethane foam,
13/4 lb density.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: 16-gage steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance 4 ft on each side.
7.

Direction of airflow.

8. Connector packages CRBTMPWR001A00 and
002A00 are for thru-the-curb type. Packages
CRBTMPWR003A00 and 004A00 are for thruthe-bottom type connections.

16

SELECTION PROCEDURE (With 581B048 Example)
I DETERMINE COOLING AND HEATING REQUIREMENTS AT DESIGN CONDITIONS.
Given:
Required Cooling Capacity (TC) . . . . . . . . . . 44,600 Btuh
Sensible Heat Capacity (SHC). . . . . . . . . . . . 32,000 Btuh
Required Heating Capacity . . . . . . . . . . . . . . 85,000 Btuh
Condenser Entering-Air Temperature . . . . . . . . . . . . 95 F
Evaporator Entering-Air Temperature . . . . . . . . .82 F edb,
67 F ewb
Evaporator Air Quantity . . . . . . . . . . . . . . . . . . . .1600 cfm
External Static Pressure (ESP) . . . . . . . . . . . . 0.75 in. wg
Electrical Characteristics (V-Ph-Hz). . . . . . . . . . . 230-1-60
II SELECT UNIT BASED ON REQUIRED COOLING
CAPACITY.
Enter the Cooling Capacities table (page 18) at condenser
entering temperature of 95 F, evaporator-air entering at
1600 cfm and 80 F db and 67 F wb. The 581B--048115
unit will provide cooling capacity of 48,900 Btuh and a
sensible heat capacity of 34,700 Btuh. For evaporator-air
temperature other than 80 F edb, calculate sensible heat
capacity correction, as required, using the formula found in
Note 3 following the Cooling Capacities tables.
For this example:
Correction factor = 1.10 x (1 – .21) x (82 – 80) = 1.738
Multiply the correction factor of 1.738 by 1600 cfm (a total
of 2781). From the Gross Cooling Capacities tables find
that the sensible heat capacity at 80 F is 34.7 MBtuh
(equivalent to 34,700 Btuh). Add 34,700 and 2781 to get
the corrected sensible heat capacity of 37,481.
NOTE: Unit ratings are gross capacities and do not
include the effect of evaporator-fan motor heat. To calculate net capacities, see Step V.
III SELECT HEATING CAPACITY OF UNIT TO PROVIDE
DESIGN CONDITION REQUIREMENTS.
In the Heating Capacities and Efficiencies table (page 5)
note that unit 581B--048115 will provide output capacity of
92,000 Btuh, which is adequate for the given application.

IV DETERMINE FAN SPEED AND POWER REQUIREMENTS AT DESIGN CONDITIONS.
Before entering the Fan Performance tables, calculate the
total static pressure required based on unit components.
From the given and the Pressure Drop tables (page 40),
find:
External static pressure
.75 in. wg
Durablade economizer
.05 in. wg
Total static pressure
= .80 in. wg
Enter the Fan Performance table for 581B--048115 vertical
discharge unit on page 27. At 1600 cfm, the standard
motor will deliver 1.1 in. wg static pressure and 1.17 Bhp.
This will adequately handle the job requirements.
Using evaporator-fan motor efficiency table and formula on
page 40, determine watts.
1.17 (746)
Watts =
.75
Watts = 1164
V DETERMINE NET COOLING CAPACITY.
Cooling capacities are gross and do not include indoor-fan
motor (IFM) heat. Determine net capacity using the following formula:
Net capacity = gross capacity – IFM heat
=

48,900 Btuh

– 1164 Watts
Btuh
)
Watts
3972 Btuh

(3.413
=

48,900 Btuh

Net capacity =

44,928 Btuh

–

Net sensible capacity = 37,481 Btuh – 3972 Btuh
= 33,509 Btuh

17

PERFORMANCE DATA
COOLING CAPACITIES
581B036 (3 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

900/0.14

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

72
41.9
20.4
2.19
40.7
19.9
2.46
39.3
19.5
2.75
37.7
18.8
3.06
36.0
18.3
3.41
34.2
17.6
3.78

67
38.7
25.2
2.16
37.5
24.7
2.42
36.1
24.1
2.71
34.6
23.5
3.02
33.0
22.9
3.36
31.3
22.2
3.73

Temp (F) Air Entering Evaporator — Cfm/BF
1200/0.17
1500/0.20
Temp (F) Air Entering Evaporator — Ewb
62
72
67
62
72
67
35.7
43.5
40.8
37.7
44.8
41.8
29.7
21.8
28.2
33.8
23.3
30.7
2.12
2.21
2.18
2.15
2.23
2.19
34.5
42.1
39.3
36.4
43.5
40.4
29.2
21.5
27.7
33.2
23.2
30.3
2.39
2.47
2.44
2.41
2.50
2.45
33.1
40.8
37.8
34.9
42.0
38.9
28.4
21.1
27.2
32.5
22.8
29.9
2.73
2.69
2.79
2.74
2.66
2.77
31.7
39.3
36.2
33.4
40.1
37.2
27.8
20.7
26.6
31.8
22.1
29.3
2.98
3.09
3.04
3.01
3.10
3.06
29.7
37.4
34.5
31.5
38.1
35.5
26.7
19.9
26.1
30.9
21.3
28.7
3.31
3.43
3.39
3.34
3.44
3.41
27.8
35.6
32.7
29.4
36.3
33.6
25.8
19.4
25.4
29.4
20.8
28.0
3.66
3.80
3.76
3.71
3.81
3.78

62
39.0
37.0
2.16
37.6
36.4
2.42
36.1
35.6
2.71
34.7
34.7
3.03
33.2
33.2
3.37
31.9
31.8
3.75

581B048 (4 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

1200/0.17
72
54.0
26.1
2.81
52.2
25.4
3.20
50.7
24.9
3.64
48.8
24.3
4.12
46.5
23.4
4.64
43.8
22.5
5.19

67
50.7
32.7
2.80
48.9
32.0
3.19
46.9
31.1
3.61
44.5
30.2
4.09
41.1
28.9
4.59
37.5
27.4
5.13

62
44.2
37.5
2.76
41.9
36.4
3.15
39.5
35.0
3.57
36.7
33.6
4.03
34.3
32.4
4.53
32.4
31.5
5.05

72
55.9
27.6
2.83
54.1
26.9
3.22
51.9
26.1
3.65
49.8
25.3
4.12
47.7
24.9
4.65
45.1
24.1
5.20

Temp (F) Air Entering Evaporator — Cfm/BF
1450/0.19
1600/0.21
Temp (F) Air Entering Evaporator — Ewb (F)
67
62
72
67
52.2
47.7
56.4
52.8
35.1
41.8
28.2
36.2
2.81
2.78
2.83
2.80
50.4
45.9
54.5
51.0
34.5
40.8
27.5
35.7
3.20
3.17
3.22
3.20
48.4
43.5
52.5
48.9
33.6
39.6
26.8
34.7
3.62
3.60
3.65
3.62
46.2
40.7
50.2
46.7
32.8
38.2
26.0
33.9
4.09
4.06
4.12
4.09
43.3
37.0
48.0
44.4
31.8
36.3
25.4
33.4
4.62
4.55
4.64
4.63
39.0
33.8
45.3
40.1
30.2
33.7
24.7
31.9
5.15
5.09
5.19
5.17

Standard Ratings
BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

2000/0.24
62
49.1
43.8
2.79
47.2
42.8
3.18
45.2
41.8
3.60
42.1
40.3
4.07
38.5
38.3
4.56
35.4
35.4
5.11

72
58.1
30.2
2.84
55.3
28.6
3.22
53.9
28.8
3.67
51.5
27.9
4.14
48.9
27.1
4.65
46.3
26.5
5.20

67
54.5
39.5
2.82
52.3
38.5
3.20
50.1
37.5
3.63
48.2
37.4
4.11
45.7
36.9
4.63
42.6
35.9
5.19

62
50.6
47.5
2.79
48.7
46.6
3.18
46.7
45.6
3.61
44.7
44.4
4.08
42.0
42.0
4.60
38.8
38.8
5.15

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible heat capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb = hewb –
4.5 x cfm
Where hewb = Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (db – 80).

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

18

PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
581B060 (5 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

72
72.5
35.7
3.55
70.5
35.0
4.00
68.3
34.5
4.50
65.9
33.7
5.05
62.8
32.5
5.62
59.9
31.7
6.28

Temp (F) Air Entering Evaporator — Cfm/BF
1750/0.09
2000/0.11
Temp (F) Air Entering Evaporator — Ewb (F)
67
62
72
67
67.3
61.1
73.0
68.4
45.5
54.2
36.8
48.0
3.50
3.46
3.55
3.51
65.1
57.9
72.2
66.4
44.8
52.8
37.0
47.6
3.96
3.90
4.03
3.97
62.5
54.3
69.3
63.8
43.8
51.1
36.0
46.7
4.45
4.37
4.51
4.46
59.8
51.7
66.9
61.1
42.8
49.7
35.3
45.7
4.99
4.90
5.06
5.00
56.7
49.1
64.0
58.2
41.6
48.2
34.4
44.6
5.58
5.49
5.65
5.60
53.4
46.2
60.8
54.9
40.4
46.2
33.3
43.4
6.21
6.13
6.29
6.24

72
88.8
45.0
4.63
86.4
44.5
5.16
83.4
43.4
5.71
80.0
42.2
6.29
75.9
40.8
6.87
71.8
39.5
7.48

Temp (F) Air Entering Evaporator — Cfm/BF
2100/0.06
2400/0.06
Temp (F) Air Entering Evaporator — Ewb (F)
67
62
72
67
82.7
76.6
90.5
84.4
57.4
68.9
47.2
61.2
4.50
4.38
4.67
4.55
80.3
74.1
88.2
81.7
56.6
68.0
46.8
60.2
5.03
4.90
5.21
5.06
77.3
71.3
85.1
78.9
55.3
66.6
45.8
59.2
5.57
5.44
5.77
5.62
73.8
68.0
81.6
75.3
54.0
65.2
44.6
57.8
6.13
6.00
6.34
6.17
70.0
64.1
77.6
71.3
52.6
63.2
43.3
56.4
6.71
6.56
6.93
6.75
65.5
59.1
72.9
66.8
51.0
59.1
41.7
55.0
7.30
7.13
7.51
7.35

1500/0.08
72
70.8
34.1
3.53
68.9
33.5
3.98
66.8
32.8
4.48
64.3
32.0
5.03
61.5
31.0
5.61
58.7
30.0
6.27

67
65.4
42.7
3.49
63.2
41.8
3.94
60.6
40.7
4.43
57.7
39.6
4.96
54.8
38.4
5.55
51.6
37.2
6.19

62
58.5
49.9
3.44
55.3
48.4
3.87
52.4
47.0
4.35
49.9
45.8
4.87
47.3
44.5
5.46
44.5
43.1
6.09

2500/0.13
62
62.8
57.8
3.47
60.2
56.8
3.92
56.6
55.0
4.40
54.1
53.5
4.93
51.6
51.6
5.52
49.0
48.9
6.17

72
74.8
39.6
3.57
73.2
39.3
4.04
71.2
39.1
4.55
68.4
38.4
5.08
65.4
37.4
5.67
62.2
36.4
6.31

67
70.3
53.0
3.54
68.1
52.5
3.99
65.6
51.8
4.48
62.8
51.0
5.02
59.9
50.0
5.61
56.8
48.9
6.27

62
64.8
63.4
3.48
62.9
62.4
3.94
60.6
60.5
4.44
58.4
58.4
4.98
56.1
56.1
5.57
53.5
53.4
6.22

581B072 (6 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

1800/0.05
72
86.7
43.0
4.58
84.1
42.0
5.10
81.3
41.0
5.65
77.9
39.7
6.22
74.7
38.7
6.84
70.3
37.2
7.43

67
80.7
53.7
4.46
78.2
52.6
4.97
75.3
51.4
5.52
72.0
50.2
6.08
68.4
48.8
6.68
63.6
47.0
7.25

62
74.4
63.8
4.33
72.0
62.7
4.85
69.2
61.4
5.39
66.1
60.0
5.94
61.8
58.1
6.49
57.2
55.8
7.03

Standard Ratings
BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

3000/0.08
62
78.2
73.6
4.41
75.7
72.5
4.93
72.9
71.2
5.48
69.6
69.3
6.04
66.5
66.4
6.63
61.9
61.9
7.22

72
92.6
51.2
4.72
90.2
50.6
5.26
87.2
50.2
5.83
83.4
49.0
6.40
78.7
46.9
6.96
74.0
45.4
7.54

67
86.3
67.4
4.58
84.0
67.4
5.12
80.6
65.8
5.66
77.1
64.5
6.22
73.0
63.2
6.80
68.6
61.8
7.41

62
81.0
80.7
4.47
78.8
78.7
4.99
76.2
76.2
5.55
73.2
73.2
6.12
70.1
70.0
6.72
66.4
66.3
7.33

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible heat capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb = hewb –
4.5 x cfm
Where hewb = Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (db – 80).

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

19

PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
581B090 (71/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75

85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

2250/0.10
72
105.5
50.6
5.15
102.5
49.7
5.86
98.9
48.5
6.65
95.3
47.3
7.51
91.0
45.9
8.43
86.2
44.1
9.38

67
96.9
63.6
5.07
93.6
62.4
5.79
90.1
61.2
6.58
86.2
59.6
7.44
82.0
58.0
8.33
77.8
56.4
9.29

Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.11
3750/0.14
Temp (F) Air Entering Evaporator — Ewb
62
72
67
62
72
67
87.6
107.3
99.6
90.7
110.3
101.9
75.7
53.3
69.2
83.7
58.0
76.6
5.04
5.16
5.11
5.06
5.20
5.13
83.6
105.1
96.5
87.5
107.7
99.0
73.9
52.8
68.4
82.2
57.3
75.9
5.73
5.89
5.82
5.77
5.93
5.86
79.3
101.6
92.9
83.5
103.8
95.3
71.9
51.9
67.2
80.2
56.2
74.9
6.49
6.69
6.61
6.53
6.72
6.64
75.7
97.6
88.8
79.6
100.0
91.0
70.2
50.7
65.9
78.0
55.3
73.6
7.31
7.55
7.48
7.36
7.59
7.50
71.6
93.2
84.5
75.4
95.6
86.6
68.1
49.3
64.2
75.3
54.2
72.1
8.20
8.46
8.37
8.27
8.52
8.42
68.1
88.3
80.0
71.9
90.0
81.9
66.3
47.5
62.6
71.8
52.1
70.1
9.14
9.43
9.34
9.24
9.47
9.38

62
93.8
92.2
5.07
90.6
90.0
5.78
87.4
87.3
6.57
84.1
84.1
7.41
80.7
80.7
8.34
77.2
77.2
9.32

581B102 (81/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

2550/0.08
72
119.5
56.5
5.92
115.5
55.1
6.77
111.3
53.7
7.71
107.2
52.2
8.75
101.9
50.2
9.80
97.3
48.7
11.03

67
105.7
65.7
5.84
101.9
64.3
6.69
97.7
62.8
7.62
93.5
61.3
8.64
89.2
59.5
9.73
84.3
57.7
10.90

62
94.8
77.8
5.77
90.6
76.1
6.61
86.6
74.2
7.52
82.5
72.7
8.54
78.0
70.7
9.64
73.1
68.5
10.70

Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.09
3400/0.11
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
123.1
109.1
98.7
124.8
110.7
100.2
60.2
71.7
86.3
62.2
75.8
92.8
5.95
5.88
5.81
5.96
5.89
5.83
119.7
105.4
94.8
121.4
106.9
96.1
58.9
70.5
85.1
61.3
74.5
90.5
6.83
6.74
6.67
6.85
6.76
6.67
115.0
101.2
90.6
117.2
102.6
91.7
68.9
82.9
60.0
73.0
88.6
57.4
7.68
7.59
7.80
7.69
7.58
7.76
110.5
96.7
85.9
112.1
97.9
87.6
56.0
67.4
81.2
58.4
71.4
86.6
8.80
8.70
8.61
8.82
8.71
8.62
104.7
91.8
81.5
106.7
93.1
83.3
53.7
65.7
79.5
56.6
69.5
83.1
9.86
9.79
9.72
9.90
9.79
9.71
100.0
86.8
76.0
101.3
87.9
78.7
52.4
63.9
76.0
54.8
67.9
78.7
11.08
10.96
10.81
11.11
10.99
10.88

Standard Ratings
BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

4250/0.13
72
126.3
67.8
5.99
124.0
66.2
6.88
120.1
65.0
7.84
114.9
63.5
8.86
109.2
61.5
9.95
102.9
59.1
11.14

67
112.8
83.3
5.91
109.1
82.9
6.79
104.8
81.5
7.74
99.9
79.5
8.75
94.9
77.8
9.84
89.5
75.7
11.03

62
103.4
101.2
5.85
98.7
98.5
6.71
94.5
94.5
7.66
90.5
90.5
8.67
86.3
86.3
9.75
81.9
81.9
10.93

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible heat capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb = hewb –
4.5 x cfm
Where hewb = Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (db – 80).

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

20

PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
581B120 (10 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

62
115.0
97.4
7.12
110.0
95.2
8.02
103.0
92.2
8.98
96.5
89.4
10.00
90.8
86.6
11.20
86.2
84.5
12.50

Temp (F) Air Entering Evaporator — Cfm/BF
3200/0.03
4000/0.04
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
141.2
130.4
118.1
145.2
134.0
122.1
66.7
84.4
101.5
71.3
93.1
113.5
7.37
7.23
7.13
7.46
7.31
7.17
138.9
126.6
113.6
142.6
130.6
117.7
66.3
83.6
99.7
71.0
92.8
112.0
8.32
8.16
8.03
8.40
8.24
8.09
135.1
121.9
107.2
138.8
125.8
112.8
65.2
82.0
97.0
70.6
91.5
109.7
9.18
9.00
9.44
9.27
9.07
9.35
129.8
116.6
99.7
133.7
120.3
107.1
63.6
80.2
93.5
69.4
89.6
106.8
10.47
10.30
10.07
10.57
10.38
10.21
124.3
110.3
92.2
127.9
114.4
100.8
61.9
77.8
90.0
67.6
87.6
100.7
11.68
11.51
11.25
11.77
11.60
11.41
118.5
103.0
87.4
121.6
107.1
96.0
60.0
75.0
87.3
65.8
85.1
96.0
13.02
12.81
12.55
13.10
12.92
12.74

62
132.8
111.6
9.18
125.8
116.4
10.19
118.0
112.5
11.41
110.7
108.6
12.36
103.2
103.2
13.50
97.5
97.4
14.65

Temp (F) Air Entering Evaporator — Cfm/BF
4300/0.09
5000/0.11
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
168.5
157.7
143.6
171.7
160.6
148.3
95.7
114.1
121.0
101.6
121.5
129.7
9.67
9.44
9.26
9.75
9.51
9.25
163.8
152.7
136.6
166.8
155.6
143.6
82.8
108.2
128.8
86.7
116.1
140.0
10.47
10.49
10.27
10.81
10.57
10.33
157.7
146.7
128.8
161.1
149.6
137.5
80.5
106.1
124.8
85.1
114.4
136.3
11.64
11.71
11.49
11.78
11.80
11.56
151.5
139.5
120.6
153.9
142.4
128.3
78.9
104.0
119.9
83.2
111.6
128.3
13.04
12.77
12.45
13.10
12.84
12.57
143.0
125.0
110.6
146.1
128.8
118.2
76.0
98.1
110.5
80.5
107.0
118.2
14.20
13.93
13.63
14.29
14.03
13.78
131.6
108.7
100.7
136.1
112.0
105.7
72.4
91.9
100.3
77.6
100.4
105.6
15.42
15.08
14.85
15.51
15.18
15.03

3000/0.03
72
140.3
65.6
7.35
137.7
65.0
8.29
133.8
63.9
9.33
128.7
62.3
10.46
123.2
60.4
11.66
117.5
58.5
12.99

67
129.4
82.2
7.21
125.3
81.2
8.13
120.7
79.6
9.16
115.4
77.6
10.28
109.1
75.1
11.47
101.8
72.5
12.77

5000/0.04
72
147.5
77.9
7.51
144.6
76.9
8.45
141.7
76.9
9.51
136.7
76.0
10.66
130.9
74.6
11.89
124.1
72.5
13.19

67
136.6
103.7
7.37
133.3
103.1
8.31
128.5
102.5
9.33
122.8
100.6
10.43
116.8
98.7
11.66
110.3
96.9
13.01

62
125.3
124.7
7.22
122.3
122.2
8.16
118.5
118.4
9.19
114.5
114.3
10.31
110.1
109.9
11.58
104.8
104.8
12.91

581B150 (121/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

3750/0.08
72
164.3
91.0
9.56
159.5
78.3
10.60
154.0
76.6
11.59
148.0
74.4
12.94
139.1
71.3
14.12
127.1
67.2
15.31

67
154.8
107.5
9.43
149.4
102.0
10.50
143.2
99.5
11.62
134.1
95.9
12.69
120.4
90.5
13.83
106.2
85.1
14.99

Standard Ratings
BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

6250/0.13
72
174.7
49.4
9.83
170.2
93.3
10.92
164.4
75.5
12.08
157.0
89.3
13.18
148.9
87.2
14.37
139.5
84.6
15.60

67
164.6
110.6
9.61
159.5
130.0
10.69
153.6
112.1
11.90
145.8
125.2
12.93
135.7
122.1
14.14
118.4
114.2
15.28

62
153.5
142.3
9.38
149.4
149.3
10.43
144.3
135.8
11.69
138.7
138.7
12.76
129.5
129.5
13.97
116.4
116.3
15.22

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible heat capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb = hewb –
4.5 x cfm
Where hewb = Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (db – 80).

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

21

PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION
581B036 (3 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

900/0.14

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

72
41.3
17.5
2.19
38.6
15.2
2.46
35.9
13.0
2.74
33.8
10.9
3.05
31.8
9.0
3.40
28.7
6.9
3.78

67
37.3
22.4
2.14
34.4
20.1
2.40
31.4
17.9
2.68
29.7
15.8
3.00
28.0
13.7
3.36
26.3
12.2
3.73

Temp (F) Air Entering Evaporator — Cfm/BF
1200/0.17
1500/0.20
Temp (F) Air Entering Evaporator — Ewb
62
72
67
62
72
67
34.3
43.5
39.2
35.9
45.5
41.6
26.7
19.6
25.5
31.2
21.5
28.5
2.10
2.21
2.16
2.14
2.24
2.19
31.6
41.3
37.5
33.3
43.5
38.6
25.1
17.1
23.2
29.0
18.9
26.3
2.37
2.47
2.43
2.40
2.51
2.45
28.8
39.2
35.9
30.6
41.3
35.7
23.3
14.5
21.1
26.9
16.1
24.2
2.63
2.76
2.74
2.67
2.80
2.75
27.4
36.3
32.2
28.7
38.1
32.8
21.0
12.5
18.9
24.6
14.0
21.7
2.97
3.09
3.04
2.99
3.12
3.07
25.5
33.2
28.7
26.5
34.9
30.0
18.4
10.3
16.8
22.3
11.9
19.3
3.31
3.45
3.38
3.32
3.48
3.41
23.4
29.7
25.5
22.9
31.3
27.1
17.3
7.9
14.5
20.6
9.2
17.3
3.66
3.84
3.77
3.71
3.87
3.79

62
38.2
35.2
2.16
35.5
32.9
2.42
32.9
30.6
2.71
30.4
28.1
3.03
27.9
25.2
3.37
25.5
22.3
3.75

581B048 (4 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

1200/0.17
72
52.9
22.7
2.87
49.2
19.8
3.26
45.8
17.2
3.71
41.6
13.5
4.20
37.2
9.9
4.73
32.4
7.2
5.29

67
47.5
28.4
2.86
43.8
25.5
3.25
40.1
22.5
3.68
37.0
19.5
4.17
33.2
16.4
4.68
28.1
12.9
5.23

62
41.5
33.4
2.82
37.1
30.4
3.21
32.8
27.3
3.64
29.7
23.9
4.11
27.1
20.7
4.62
24.9
18.3
5.15

72
55.7
26.1
2.89
52.1
22.2
3.28
48.2
18.4
3.72
43.2
14.7
4.20
38.4
11.3
4.74
33.8
8.4
5.30

Temp (F) Air Entering Evaporator — Cfm/BF
1450/0.19
1600/0.21
Temp (F) Air Entering Evaporator — Ewb
67
62
72
67
50.9
47.5
57.0
51.7
34.1
38.9
25.9
33.7
2.87
2.84
2.89
2.86
47.2
43.6
52.9
47.9
29.5
35.8
22.4
31.1
3.26
3.23
3.28
3.26
43.6
39.4
48.8
44.0
24.8
32.6
19.0
28.1
3.69
3.67
3.72
3.69
38.9
35.4
43.9
39.7
21.7
29.2
15.0
23.7
4.17
4.14
4.20
4.17
34.0
30.8
39.4
35.5
18.5
25.6
11.2
19.7
4.71
4.64
4.73
4.72
28.1
27.4
35.3
30.5
14.5
21.9
16.8
21.1
5.25
5.19
5.29
5.27

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

2000/0.24
62
48.1
41.6
2.85
43.7
38.7
3.24
39.3
35.9
3.67
34.7
30.6
4.15
30.0
25.4
4.65
26.6
21.2
5.21

72
60.5
29.4
2.90
55.4
24.2
3.28
51.7
20.7
3.74
46.5
16.4
4.22
41.3
12.4
4.74
36.1
9.5
5.30

67
55.6
39.1
2.88
51.4
36.0
3.26
47.4
33.0
3.70
41.4
27.8
4.19
35.2
22.4
4.72
32.0
18.3
5.29

62
52.1
47.5
2.85
47.0
44.3
3.24
43.0
41.0
3.68
37.5
35.1
4.16
31.9
28.6
4.69
28.7
24.1
5.25

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (hlwb)
hlwb = hewb –

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

22

PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION (cont)
581B060 (5 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

72
74.7
31.7
3.64
70.6
27.5
4.07
66.5
23.5
4.55
61.8
20.0
5.09
56.6
16.5
5.64
51.3
12.5
6.28

Temp (F) Air Entering Evaporator — Cfm/BF
1750/0.09
2000/0.11
Temp (F) Air Entering Evaporator — Ewb
67
62
72
67
67.3
61.0
78.5
71.2
40.5
51.2
34.5
44.2
3.58
3.49
3.65
3.60
63.2
56.3
75.5
66.8
37.6
48.0
30.7
41.6
4.01
3.92
4.11
4.00
58.8
51.3
70.4
61.9
34.5
44.6
26.0
38.6
4.47
4.37
4.56
4.42
54.5
47.7
65.1
57.2
31.2
40.1
22.1
34.3
4.97
4.88
5.11
4.96
50.0
44.2
59.6
52.5
27.8
35.7
18.2
30.0
5.52
5.45
5.69
5.55
45.0
39.0
54.1
46.8
22.2
31.5
13.5
24.0
6.18
6.09
6.33
6.18

72
84.9
37.5
4.67
80.9
33.0
5.22
76.3
28.2
5.80
71.4
23.4
6.45
66.0
18.8
7.10
58.4
15.7
7.83

Temp (F) Air Entering Evaporator — Cfm/BF
2100/0.06
2400/0.06
Temp (F) Air Entering Evaporator — Ewb
67
62
72
67
78.0
70.9
85.9
79.5
49.1
59.7
38.8
51.1
4.57
4.46
4.70
4.57
73.4
65.8
82.0
74.4
44.7
55.8
34.7
47.4
5.11
4.96
5.26
5.09
68.3
60.5
77.5
69.3
40.0
51.6
30.2
43.7
5.66
5.48
5.84
5.68
64.3
56.2
72.1
64.6
36.5
48.0
25.4
38.4
6.27
6.10
6.46
6.29
60.1
51.5
66.4
59.6
32.9
44.1
20.7
33.3
6.91
6.74
7.12
6.95
52.4
46.1
57.6
52.1
27.5
39.0
17.5
27.5
7.67
7.49
7.89
7.72

1500/0.08
72
69.9
29.0
3.61
65.9
25.3
4.05
61.9
21.6
4.53
57.7
18.1
5.05
53.4
14.7
5.60
48.7
10.9
6.26

67
62.7
36.9
3.55
59.1
34.0
3.97
55.2
31.1
4.43
51.1
27.8
4.93
47.2
24.6
5.49
42.0
19.6
6.12

62
56.2
43.9
3.51
51.7
41.9
3.91
47.7
40.0
4.35
44.9
35.7
4.84
42.0
31.5
5.40
36.9
28.0
6.02

2500/0.13
62
64.8
55.4
3.51
60.7
52.0
3.95
55.7
47.9
4.41
50.8
43.5
4.92
46.2
39.0
5.48
40.9
34.0
6.13

72
81.7
37.8
3.62
78.1
33.8
4.08
74.2
30.0
4.58
68.4
26.1
5.11
62.6
22.1
5.69
56.9
16.5
6.33

67
75.5
52.0
3.58
70.8
47.4
4.02
65.9
42.8
4.49
60.3
38.9
5.03
54.9
34.9
5.61
49.2
28.0
6.27

62
69.3
62.8
3.51
65.1
58.0
3.96
60.6
52.6
4.44
56.1
48.5
4.98
51.6
44.3
5.57
45.9
38.8
6.22

581B072 (6 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

1800/0.05
72
82.6
36.0
4.60
78.2
31.4
5.16
73.8
27.0
5.75
68.4
22.3
6.37
63.4
18.1
7.04
55.5
15.3
7.80

67
75.6
44.8
4.52
71.6
41.2
5.03
67.4
37.6
5.60
62.6
33.5
6.22
57.8
29.5
6.89
49.6
24.0
7.61

62
68.5
55.4
4.36
64.5
51.7
4.89
60.2
47.9
5.44
55.9
43.5
6.06
50.7
38.9
6.68
45.8
35.2
7.38

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

3000/0.08
62
73.5
64.0
4.45
67.9
60.1
4.97
62.3
56.2
5.53
58.3
50.2
6.16
54.5
43.8
6.83
49.5
38.4
7.58

72
89.1
41.8
4.77
85.8
37.6
5.32
82.0
33.6
5.90
75.7
29.1
6.53
68.8
24.3
7.16
59.2
20.9
7.92

67
82.7
58.1
4.61
78.2
54.3
5.17
72.8
49.2
5.73
67.0
45.2
6.36
60.8
41.4
7.01
52.8
34.6
7.78

62
77.0
70.2
4.51
72.3
66.7
5.04
67.5
62.9
5.60
62.4
56.2
6.24
57.5
49.7
6.92
53.1
44.4
7.70

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (hlwb)
hlwb = hewb –

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

23

PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION (cont)
581B090 (71/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

2250/0.10
72
98.4
44.5
5.05
94.2
39.7
5.74
89.9
34.8
6.42
84.6
30.0
7.26
79.2
25.2
8.10
72.8
20.1
9.10

67
91.1
55.4
4.96
85.8
51.3
5.65
80.5
47.2
6.33
75.3
42.5
7.16
70.1
37.8
7.99
64.5
33.4
8.94

Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.11
3750/0.14
Temp (F) Air Entering Evaporator — Ewb
62
72
67
62
72
67
81.1
103.7
97.9
91.8
105.8
101.3
67.0
50.4
65.4
80.5
54.5
72.4
4.87
5.09
5.04
4.97
5.16
5.04
76.9
100.3
92.4
85.2
103.5
96.8
62.7
46.2
58.3
75.7
50.6
68.2
5.55
5.81
5.75
5.64
5.89
5.74
72.6
96.9
86.8
78.6
101.1
92.2
58.3
41.9
51.2
71.0
46.6
63.9
6.22
6.52
6.45
6.31
6.62
6.43
68.0
91.6
81.3
73.4
94.5
86.3
53.9
36.9
49.3
66.4
41.4
59.2
7.05
7.36
7.25
7.15
7.46
7.29
63.3
86.2
75.8
68.1
87.9
80.3
49.4
31.9
47.4
61.9
36.1
54.4
7.87
8.20
8.05
7.98
8.30
8.14
57.2
78.0
69.8
62.3
81.6
73.2
44.1
25.4
42.5
56.5
31.1
48.9
8.83
9.23
9.05
8.95
9.26
9.10

62
94.1
89.5
4.99
89.0
84.3
5.70
83.8
79.1
6.40
78.4
73.8
7.23
72.9
68.5
8.05
69.2
64.7
8.99

581B102 (81/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

2550/0.08
72
112.4
49.1
6.10
105.7
43.6
6.92
98.9
38.0
7.73
91.8
32.6
8.80
84.7
27.2
9.86
77.6
21.8
10.93

67
102.2
62.4
5.96
95.7
57.1
6.78
89.1
51.7
7.59
82.3
46.3
8.64
75.5
40.9
9.69
68.7
35.5
10.74

62
92.6
75.0
5.86
86.5
69.9
6.63
80.4
64.8
7.40
73.8
59.5
8.47
67.3
54.2
9.53
60.7
48.9
10.60

Temp (F) Air Entering Evaporator — Cfm/BF
3000/0.09
3400/0.11
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
115.2
106.4
96.4
119.6
110.3
101.3
52.9
68.5
82.3
56.2
73.3
89.5
6.18
6.05
5.95
6.18
6.05
5.95
110.0
100.6
91.0
114.0
103.7
94.6
47.8
62.8
76.9
50.7
67.9
82.8
6.97
6.90
6.75
7.01
6.85
6.75
104.7
94.8
85.5
108.4
97.0
87.9
42.7
57.0
71.4
45.2
62.4
76.2
7.75
7.75
7.56
7.84
7.65
7.54
97.3
87.6
78.6
100.4
89.8
80.8
37.0
51.9
66.8
39.3
56.7
70.0
8.80
8.76
8.58
8.89
8.69
8.59
89.8
80.5
71.7
92.5
82.5
73.8
31.4
46.9
62.2
33.4
51.0
63.8
9.86
9.77
9.61
9.95
9.74
9.65
82.4
73.3
64.8
84.5
75.3
66.7
25.7
41.8
57.6
27.5
45.3
57.6
10.91
10.78
10.64
11.00
10.78
10.70

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

4250/0.13
72
127.6
62.8
6.18
118.2
74.7
7.01
108.8
86.5
7.84
102.3
68.6
8.93
95.8
50.6
10.01
89.3
32.7
11.10

67
117.6
83.3
6.10
110.9
77.7
6.91
104.1
72.0
7.71
95.3
65.5
8.77
86.6
59.1
9.84
77.8
52.6
10.90

62
108.0
101.7
6.00
101.2
94.8
6.80
94.3
87.9
7.60
85.8
80.9
8.67
77.4
73.9
9.75
68.9
66.9
10.82

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (hlwb)
hlwb = hewb –

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

24

PERFORMANCE DATA (cont)
COOLING CAPACITIES, UNITS WITH PERFECT HUMIDITY™ OPTION (cont)
581B120 (10 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

62
111.4
93.7
6.72
104.6
87.2
7.59
97.8
80.6
8.46
90.4
73.8
9.6
83.1
66.9
10.8
75.7
60.1
11.94

Temp (F) Air Entering Evaporator — Cfm/BF
3200/0.03
4000/0.04
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
135.8
124.3
113.0
138.4
129.5
123.5
61.3
79.1
97.4
68.0
89.5
109.4
7.01
6.89
6.77
7.10
6.92
6.77
128.9
118.1
107.0
132.5
121.5
116.6
53.9
72.0
91.2
61.0
82.7
102.4
7.94
7.78
7.51
8.02
7.84
7.69
121.9
111.8
101.0
126.5
113.4
109.7
46.5
64.8
84.9
53.9
75.9
95.4
8.86
8.66
8.26
8.94
8.76
8.60
113.1
103.2
93.4
117.2
105.0
100.7
38.8
57.8
78.9
45.6
68.2
86.8
10.0
9.8
9.5
10.1
9.9
9.8
104.3
94.6
85.9
107.8
96.7
91.7
31.2
50.7
72.9
37.3
60.6
78.3
11.2
11.0
10.7
11.3
11.1
11.0
95.5
86.0
78.3
98.5
88.3
82.7
23.5
43.7
66.8
29.0
52.9
69.7
12.38
12.13
11.92
12.48
12.27
12.25

62
132.3
112.1
8.59
123.7
103.8
9.58
115.1
95.5
10.57
105.8
86.5
11.82
96.4
77.5
13.08
87.1
68.5
14.33

Temp (F) Air Entering Evaporator — Cfm/BF
4300/0.09
5000/0.11
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
160.0
148.4
136.2
162.8
150.6
138.2
72.5
94.8
121.3
76.9
99.6
127.5
9.35
9.08
8.80
9.40
9.18
8.9
150.7
140.1
127.2
154.1
140.8
127.9
63.5
86.5
112.2
68.7
91.0
118.1
10.36
10.08
9.77
10.40
10.34
10.03
141.4
131.8
118.3
145.3
131.0
117.6
54.4
78.1
103.2
60.5
82.3
108.7
11.37
11.08
10.74
11.40
11.50
11.1
131.7
121.0
108.7
134.8
119.9
107.7
45.4
69.0
93.9
51.2
74.2
101.3
12.67
12.34
11.96
12.70
12.67
12.28
122.1
110.2
99.0
124.2
108.8
97.8
36.4
59.8
84.7
41.9
66.1
93.8
13.98
13.59
13.18
14.00
13.83
13.41
112.4
99.4
89.3
113.7
97.7
87.8
27.4
50.7
75.5
32.6
58.0
86.4
15.28
14.85
14.40
15.30
15.00
14.54

3000/0.03
72
134.3
60.0
7.03
127.6
51.5
7.96
120.9
43.0
8.88
112.0
36.1
10.0
103.0
29.2
11.2
94.1
22.3
12.35

67
122.5
76.1
6.84
115.4
68.8
7.86
108.3
61.5
8.87
99.9
54.1
10.0
91.5
46.7
11.1
83.1
39.3
12.15

5000/0.04
72
143.3
75.2
7.15
137.2
68.6
8.02
131.1
62.0
8.89
122.1
53.0
10.1
113.0
44.0
11.3
104.0
35.0
12.53

67
136.5
100.9
7.03
128.0
93.6
7.94
119.4
86.2
8.85
110.5
78.3
10.0
101.6
70.3
11.2
92.7
62.4
12.30

62
130.2
123.3
6.88
122.9
115.9
7.79
115.5
108.4
8.69
105.9
99.7
9.9
96.4
90.9
11.1
86.8
82.2
12.28

581B150 (121/2 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
75
85
95
105
115
125

BF
Edb
Ewb
kW
SHC
TC

—
—
—
—
—
—

TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW

3750/0.08
72
156.3
66.6
9.28
147.6
58.7
10.29
138.9
50.8
11.29
129.1
42.1
12.59
119.2
33.5
13.90
109.4
24.8
15.20

67
144.2
87.6
8.98
136.2
80.0
9.93
128.2
72.3
10.87
117.8
63.5
12.14
107.3
54.8
13.40
96.9
46.0
14.67

LEGEND
Bypass Factor
Entering Dry Bulb
Entering Wet Bulb
Compressor Motor Power Input
Sensible Heat Capacity (1000 Btuh) Gross
Total Capacity (1000 Btuh) Gross

6250/0.13
72
169.0
87.0
9.43
161.1
77.7
10.45
153.1
68.5
11.46
140.9
57.7
12.79
128.7
46.8
14.11
116.5
36.0
15.44

67
157.5
115.5
9.18
148.0
107.8
10.18
138.4
100.0
11.17
126.9
90.2
12.46
115.3
80.5
13.75
103.8
70.7
15.04

62
145.6
142.7
8.93
135.4
133.2
9.88
125.1
123.7
10.83
115.9
113.6
12.08
106.7
103.5
13.33
97.5
93.5
14.58

NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb = tedb –
1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (hlwb)
hlwb = hewb –

total capacity (Btuh)
4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil.
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).

25

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS
581B036 (3 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.1
Rpm
581
644
687
733
754
810
841

Bhp
0.18
0.22
0.26
0.32
0.38
0.45
0.53

EXTERNAL STATIC PRESSURE (in. wg)
0.3
0.4
Rpm
Bhp
Rpm
Bhp
805
0.25
736
0.22
782
0.28
835
0.30
806
0.30
867
0.35
843
0.35
903
0.41
891
0.43
942
0.48
937
0.51
984
0.57
985
0.61
1029
0.66

Rpm
865
900
929
960
991
1032
1073

Bhp
0.43
0.49
0.55
0.64
0.70
0.78
0.84

EXTERNAL STATIC PRESSURE (in. wg)
0.9
1.0
Rpm
Bhp
Rpm
Bhp
1039
0.47
1061
0.51
1061
0.55
1088
0.60
1091
0.61
1109
0.66
1109
0.68
1156
0.73
1152
0.76
1190
0.82
1181
0.83
1237
0.88
1225
0.89
1271
0.95

Rpm
1083
1111
1127
1203
1228
1293
1371

0.2
Bhp
0.12
0.19
0.22
0.26
0.29
0.35
0.42

Rpm
673
709
746
785
826
868
911

0.5

0.6
Bhp
0.29
0.35
0.40
0.47
0.53
0.62
0.72

Rpm
911
937
964
994
1047
1067
1109

Bhp
0.54
0.66
0.73
0.81
0.87
0.94
1.00

Rpm
1105
1136
1145
1250
1266
1349
1383

Bhp
0.34
0.38
0.40
0.50
0.60
0.67
0.77

581B036 (3 TONS) — STANDARD MOTOR (cont)
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.7
Rpm
957
992
1013
1045
1075
1110
1150

0.8
Bhp
0.39
0.44
0.49
0.56
0.64
0.73
0.78

Rpm
988
1039
1068
1090
1122
1160
1190

1.1

1.2
Bhp
0.58
0.72
0.80
0.86
0.94
0.99
1.05

581B036 (3 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.2
Rpm
673
709
746
785
826
868
911

0.4
Bhp
0.18
0.22
0.28
0.32
0.38
0.45
0.53

Rpm
805
835
867
903
942
984
1029

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.25
911
0.34
988
0.30
937
0.38
1039
0.35
964
0.40
1068
1090
0.41
994
0.50
1122
0.48
1047
0.60
1087
0.67
1160
0.57
1109
0.77
1190
0.66

0.8

1.0
Bhp
0.43
0.49
0.55
0.64
0.70
0.84
1.00

Rpm
1061
1086
1109
1156
1190
1237
1271

Bhp
0.73
0.80
0.85
0.94
1.07
1.19
1.34

Rpm
1224
1258
1268
1340
1402
1494
1532

Bhp
0.47
0.55
0.61
0.68
0.76
0.85
0.95

581B036 (3 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

Bhp —
FIOP —

1.2
Rpm
1105
1136
1145
1210
1266
1349
1363

1.4
Bhp
0.57
0.63
0.67
0.74
0.84
0.93
1.05

Rpm
1140
1172
1181
1248
1306
1391
1406

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
0.63
1170
0.68
1198
0.69
1203
0.75
1232
0.73
1213
0.80
1242
0.81
1282
0.88
1312
0.92
1341
1.00
1373
1.02
1429
1.11
1463
1.15
1465
1.25
1500

1.8

2.0
Bhp
0.77
0.86
0.91
1.01
1.14
1.26
1.43

4. Maximum continuous bhp is 1.20 for standard motor, 2.40 for high-static
motor. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected. See Evaporator-Fan Motor
Data tables on pages 41 and 42 for additional information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
6. Interpolation is permissible. Do not extrapolate.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 2.)
2. Motor drive range is 760 to 1090 rpm for standard motor; 1075 to 1455 rpm
for high-static motor. All other rpms require a field-supplied drive.
3. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

26

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B048 (4 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)

0.1
Rpm
596
633
672
711
751
791
831
872
913

1200
1300
1400
1500
1600
1700
1800
1900
2000

Rpm
722
754
788
822
871
907
929
965
1002

EXTERNAL STATIC PRESSURE (in. wg)
0.3
0.4
0.6
Bhp
Rpm
Bhp
Rpm
872
0.31
779
0.36
902
0.36
809
0.42
840
0.48
933
0.42
873
0.55
963
0.49
0.56
907
0.63
993
0.65
941
0.72
1024
0.74
976
0.81
1057
0.84
1011
0.92
1091
1125
0.95
1046
1.03

Bhp
0.48
0.55
0.62
0.69
0.77
0.87
0.97
1.08
1.21

Rpm
915
943
972
1002
1033
1064
1095
1127
1160

Rpm
1056
1090
1120
1147
1174
1203
1233
1263
1294

EXTERNAL STATIC PRESSURE (in. wg)
1.1
1.2
1.4
Bhp
Rpm
Bhp
Rpm
0.72
1083
0.74
1134
0.85
1121
0.89
1171
0.96
1153
1.00
1210
1.06
1180
1.13
1241
1207
1.25
1269
1.17
1.29
1235
1.37
1296
1.41
1263
1.49
1323
1.54
1294
1.63
1351
1.68
1325
1.78
1362

Bhp
0.80
0.94
1.12
1.27
1.40
1.53
1.67
1.81
1.97

Rpm
1185
1219
1257
1295
1326
1354
1381
1408
1436

0.2
Bhp
0.20
0.24
0.30
0.35
0.42
0.49
0.58
0.67
0.77

Rpm
665
699
735
770
835
873
881
919
958

Bhp
0.25
0.30
0.36
0.42
0.49
0.57
0.66
0.75
0.86

0.7

0.8
Bhp
0.54
0.61
0.69
0.77
0.85
0.96
1.06
1.17
1.30

Rpm
957
984
1011
1041
1072
1103
1132
1162
1195

Bhp
0.88
1.00
1.17
1.37
1.54
1.70
1.85
2.00
2.16

Rpm
1231
1268
1307
1339
1376
1407
1436
1463
1489

Bhp
0.60
0.67
0.75
0.84
0.93
1.04
1.14
1.25
1.38

581B048 (4 TONS) — STANDARD MOTOR (cont)
AIRFLOW
(Cfm)

0.9
Rpm
993
1021
1049
1077
1107
1137
1167
1197
1229

1200
1300
1400
1500
1600
1700
1800
1900
2000

1.0
Bhp
0.65
0.74
0.82
0.92
1.00
1.12
1.23
1.35
1.48

Rpm
1028
1058
1086
1113
1141
1171
1202
1232
1262

Bhp
0.69
0.80
0.89
0.99
1.09
1.20
1.32
1.45
1.58

1.6

1.8
Bhp
0.99
1.10
1.25
1.43
1.65
1.84
2.02
2.19
2.36

581B048 (4 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

0.2
Rpm
665
699
735
770
835
873
881
919
958

0.4
Bhp
0.25
0.30
0.36
0.42
0.49
0.57
0.66
0.75
0.86

Rpm
779
809
840
873
907
941
976
1011
1046

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.36
872
0.48
957
0.42
902
0.55
984
0.48
933
0.62
1011
0.55
963
0.69
1041
0.63
993
0.77
1072
1103
0.72
1024
0.87
1132
0.81
1057
0.97
1091
1.08
1162
0.92
1125
1.21
1195
1.03

0.8

1.0
Bhp
0.60
0.67
0.75
0.84
0.93
1.04
1.14
1.25
1.38

Rpm
1028
1058
1086
1113
1141
1171
1202
1232
1262

Bhp
0.99
1.10
1.25
1.43
1.65
1.84
2.02
2.19
2.36

Rpm
1374
1309
1349
1382
1420
1452
1482
—
—

Bhp
0.69
0.80
0.89
0.99
1.09
1.20
1.32
1.45
1.58

581B048 (4 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

Bhp —
FIOP —

1.2
Rpm
1083
1121
1153
1180
1207
1235
1263
1294
1325

1.4
Bhp
0.74
0.89
1.00
1.13
1.25
1.37
1.49
1.63
1.78

Rpm
1134
1171
1210
1241
1269
1296
1323
1351
1362

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
0.80
1185
0.88
1331
0.94
1219
1.00
1268
1.12
1257
1.17
1307
1.27
1295
1.37
1339
1.40
1326
1.54
1376
1.53
1354
1.70
1407
1.67
1381
1.85
1436
1.81
1408
2.00
1463
1.97
1436
2.16
1489

2.0
Bhp
1.09
1.21
1.37
1.57
1.81
2.02
2.22
—
—

5. Maximum continuous bhp is 1.2 for standard motor, 2.4 for high-static motor.
Extensive motor and electrical testing on these units ensures that the full
range of the motor can be utilized with confidence. Using your fan motors up
to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.

1.8

indicates field-supplied motor and drive required.

3. Motor drive range is 840 to 1185 rpm for standard motor; 1075 to 1455 rpm
for high-static motor. All other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

27

PERFORMANCE DATA — (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B060 (5 TONS) — STANDARD MOTOR — SINGLE-PHASE UNITS
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
0.1
0.2
0.4
0.6
0.8
1.0
(Cfm)
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1027
0.73
1107
0.88
1185
1.04
1500
771
0.37
828
0.44
935
0.58
1056
0.81
1127
0.97
1215
1.14
1600
816
0.45
869
0.51
968
0.66
1094
0.91
1175
1.09
1245
1.26
1700
902
0.61
940
0.60
1007
0.75
1322
1.33
1063
0.82
1147
0.97
1248
1.20
1800
942
0.70
978
0.66
1356
1.47
1023
0.78
1097
0.91
1175
1.11
1266
1.29
1900
982
0.80
1303
1.41
1397
1.52
1022
0.91
1068
0.90
1132
1.01
1218
1.23
2000
1261
1.35
1340
1.53
1428
1.66
1063
0.99
1115
1.00
1180
1.17
2100
1104
1.13
1159
1.15
1214
1.28
1310
1.52
1375
1.63
1459
1.80
2200
1248
1.38
1358
1.69
1410
1.72
1488
1.93
1130
1.26
1202
1.29
2300
1174
1.37
1237
1.41
1292
1.55
1392
1.81
1460
1.90
1532
2.14
2400
1201
1.48
1272
1.53
1335
1.71
1427
1.94
1518
2.16
1575
2.35
2500

1.2
Rpm
1257
1286
1315
1395
1430
1459
1489
1528
1561
1584
1633

Bhp
1.20
1.31
1.44
1.46
1.58
1.67
1.80
1.95
2.13
2.28
2.53

1.4
Rpm
Bhp
1330
1.38
1353
1.49
1381
1.52
1475
1.56
1504
1.69
1532
1.82
1567
1.99
1603
2.17
1637
2.35
1671
2.55
1698
2.72

1.6
Rpm
Bhp
1411
1.59
1421
1.68
1443
1.69
1542
1.71
1556
1.82
1588
1.97
1626
2.16
1666
2.37
1710
2.54
1756
2.70
—
—

1.2
Rpm
1257
1286
1315
1395
1430
1459
1489
1528
1561
1584
1633

Bhp
1.20
1.31
1.44
1.46
1.58
1.67
1.80
1.95
2.13
2.28
2.53

1.4
Rpm
Bhp
1330
1.38
1353
1.49
1381
1.52
1475
1.56
1504
1.69
1532
1.82
1567
1.99
1603
2.17
1637
2.35
1671
2.55
1698
2.72

1.6
Rpm
Bhp
1411
1.59
1421
1.68
1443
1.69
1542
1.71
1556
1.82
1588
1.97
1626
2.16
1666
2.37
1710
2.54
1756
2.70
—
—

581B060 (5 TONS) — STANDARD MOTOR — THREE-PHASE UNITS
AIRFLOW
(Cfm)

0.1
Rpm
771
816
902
942
982
1022
1063
1104
1130
1174
1201

1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

Bhp
0.37
0.45
0.61
0.70
0.80
0.91
0.99
1.13
1.26
1.37
1.48

0.2
Rpm
828
869
940
978
1023
1068
1115
1159
1202
1237
1272

Bhp
0.44
0.51
0.60
0.66
0.78
0.90
1.00
1.15
1.29
1.41
1.53

0.4
Rpm
935
968
1007
1063
1097
1132
1180
1214
1248
1292
1335

Bhp
0.58
0.66
0.75
0.82
0.91
1.01
1.17
1.28
1.38
1.55
1.71

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1185
1.04
1027
0.73
1107
0.88
1127
0.97
1215
1.14
1056
0.81
1175
1.09
1245
1.26
1094
0.91
1147
0.97
1248
1.20
1322
1.33
1175
1.11
1266
1.29
1356
1.47
1218
1.23
1303
1.41
1397
1.52
1261
1.35
1340
1.53
1428
1.66
1310
1.52
1375
1.63
1459
1.80
1358
1.69
1410
1.72
1488
1.93
1392
1.81
1460
1.90
1532
2.14
1427
1.94
1518
2.16
1575
2.35

581B060 (5 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)

0.2
Rpm
808
846
884
924
965
1008
1051
1095
1140
1185
1231

1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

0.4
Bhp
0.42
0.49
0.57
0.66
0.76
0.87
0.99
1.12
1.26
1.41
1.57

Rpm
914
950
983
1018
1057
1096
1136
1173
1210
1249
1289

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.56
1001
0.69
1084
0.64
1034
0.78
1111
0.72
1068
0.88
1145
0.82
1105
0.98
1179
0.92
1143
1.10
1212
1.04
1177
1.22
1247
1.17
1210
1.35
1284
1322
1.30
1245
1.49
1356
1.47
1284
1.65
1323
1.80
1389
1.61
1363
2.00
1424
1.78

0.8

1.0
Bhp
0.85
0.94
1.03
1.13
1.26
1.40
1.54
1.70
1.80
2.03
2.22

Rpm
1168
1194
1218
1246
1280
1300
1347
1380
1418
1456
1500

Bhp
1.91
2.01
2.03
2.15
2.31
2.49
2.77
2.97
3.42
—
—

Rpm
1349
1401
1459
1548
1594
1624
1654
1691
1755
—
—

Bhp
1.01
1.11
1.21
1.32
1.43
1.57
1.72
1.89
2.07
2.26
2.45

581B060 (5 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

1.2
Rpm
1199
1263
1295
1319
1343
1374
1409
1442
1475
1565
1596

1.4
Bhp
1.19
1.28
1.39
1.52
1.64
1.77
1.91
2.08
2.26
2.47
2.95

Rpm
1126
1275
1351
1389
1415
1438
1465
1498
1554
1649
1682

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
1.46
1250
1.69
1301
1.49
1299
1.78
1352
1.58
1352
1.80
1407
1.71
1435
1.91
1494
1.80
1478
2.05
1538
1.99
1505
2.21
1566
2.14
1533
2.45
1596
1632
2.30
1568
2.64
1627
3.03
1693
2.64
1726
3.31
—
2.89
3.45
1760
3.96
—

2.0
Bhp
2.12
2.23
2.26
2.40
2.57
2.77
3.08
3.31
3.81
—
—

5. Maximum continuous bhp is 1.30 for single-phase standard motors, 2.40 for
3-phase standard motors, and 2.90 for high-static motors. Extensive motor
and electrical testing on these units ensures that the full range of the motor
can be utilized with confidence. Using your fan motors up to the ratings
shown will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected. See Evaporator-Fan Motor Data tables on
pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.

1.8

indicates field-supplied motor and drive required.

3. Motor drive range is 1020 to 1460 rpm for single-phase standard motors,
1120 to 1585 for 3-phase standard motors, and 1300 to 1685 for high-static
motors. All other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

28

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B072 (6 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)

0.1
Rpm
942
982
1022
1063
1104
1130
1174
1201
1246
1285
1304
1345
1378

1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000

Bhp
0.70
0.80
0.91
0.99
1.13
1.26
1.37
1.48
1.62
1.75
1.87
2.07
2.26

0.2
Rpm
978
1023
1068
1115
1159
1202
1237
1272
1320
1361
1402
1446
1489

Bhp
0.66
0.78
0.90
1.00
1.15
1.29
1.41
1.53
1.68
1.82
1.95
2.16
2.36

0.4
Rpm
1063
1097
1132
1180
1214
1248
1292
1335
1368
1400
1439
1477
1529

Bhp
0.82
0.91
1.01
1.17
1.28
1.38
1.55
1.71
1.81
1.91
2.08
2.16
2.52

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1147
0.97
1248
1.20
1322
1.33
1175
1.11
1266
1.29
1356
1.47
1218
1.23
1303
1.41
1397
1.52
1261
1.35
1340
1.53
1428
1.66
1310
1.52
1375
1.63
1459
1.80
1358
1.69
1410
1.72
1488
1.93
1392
1.81
1460
1.90
1532
2.14
1427
1.94
1518
2.16
1575
2.35
1562
2.42
1620
2.59
1458
2.06
1602
2.64
1666
2.85
1490
2.19
1543
2.43
1642
2.86
—
—
1585
2.65
—
—
—
—
1598
2.73
—
—
—
—

1.2
Rpm
1395
1430
1459
1489
1528
1561
1584
1633
1675
—
—
—
—

Bhp
1.46
1.58
1.67
1.80
1.95
2.13
2.28
2.53
2.77
—
—
—
—

1.4
Rpm
1475
1504
1532
1567
1603
1637
1671
1698
—
—
—
—
—

Bhp
1.56
1.69
1.82
1.99
2.17
2.35
2.55
2.72
—
—
—
—
—

1.6
Rpm
1542
1556
1588
1626
1666
1710
1756
—
—
—
—
—
—

Bhp
1.71
1.82
1.97
2.16
2.37
2.54
2.70
—
—
—
—
—
—

581B072 (6 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000

0.2
Rpm
978
1023
1068
1115
1159
1202
1237
1272
1320
1361
1402
1446
1489

0.4
Bhp
0.66
0.78
0.90
1.00
1.15
1.29
1.41
1.53
1.68
1.82
1.95
2.16
2.36

Rpm
1063
1097
1132
1180
1214
1248
1292
1335
1368
1400
1439
1477
1529

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.82
1147
0.97
1248
0.91
1175
1.11
1266
1303
1.01
1218
1.23
1340
1.17
1261
1.35
1310
1.52
1375
1.28
1358
1.69
1410
1.38
1392
1.81
1460
1.55
1.71
1427
1.94
1518
1.81
1458
2.06
1562
1.91
1490
2.19
1602
2.08
1543
2.43
1642
1753
2.16
1585
2.65
1767
2.52
1598
2.73

0.8

1.0
Bhp
1.20
1.29
1.41
1.53
1.63
1.72
1.90
2.16
2.42
2.64
2.86
3.58
3.69

Rpm
1322
1356
1397
1428
1459
1488
1532
1575
1620
1666
1775
—
—

Bhp
1.94
2.06
2.23
2.44
2.68
2.87
—
—
—
—
—
—
—

Rpm
1667
1682
1717
1758
—
—
—
—
—
—
—
—
—

Bhp
1.33
1.47
1.52
1.66
1.80
1.93
2.14
2.35
2.59
2.85
3.62
—
—

581B072 (6 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000

Bhp
FIOP

—
—

1.2
Rpm
1395
1430
1459
1489
1528
1561
1584
1633
1675
1776
—
—
—

1.4
Bhp
1.46
1.58
1.67
1.80
1.95
2.13
2.28
2.53
2.77
3.45
—
—
—

Rpm
1475
1504
1532
1567
1603
1637
1671
1698
1768
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
1.56
1542
1.71
1607
1.69
1556
1.82
1621
1.82
1588
1.97
1655
1.99
1626
2.16
1694
2.17
1666
2.37
1736
2.35
1710
2.54
1782
2.55
—
1756
2.70
1779
3.13
—
2.72
3.26
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2.0
Bhp
2.16
2.30
2.49
2.73
—
—
—
—
—
—
—
—
—

5. Maximum continuous bhp is 2.40 for standard motors, 2.90 for high-static
motors. Extensive motor and electrical testing on these units ensures that
the full range of the motor can be utilized with confidence. Using your fan
motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. See Evaporator-Fan
Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.

1.8

indicates field-supplied motor and drive required.

3. Motor drive range is 1120 to 1585 rpm for standard motors, 1300 to
1685 rpm for high-static motors. All other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

29

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B090 (71/2 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)

0.2
Rpm
506
514
521
536
551
559
567
582
598
614
630
646
662
679
695
712
729
745
754

2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.4
Bhp
0.52
0.55
0.57
0.63
0.69
0.72
0.75
0.83
0.90
0.98
1.07
1.16
1.26
1.36
1.47
1.59
1.71
1.84
1.91

Rpm
586
593
600
613
626
634
641
655
670
684
699
714
729
744
759
774
790
805
813

0.6
Bhp
0.72
0.76
0.79
0.85
0.93
0.97
1.00
1.08
1.17
1.25
1.35
1.45
1.55
1.66
1.78
1.90
2.03
2.17
2.24

Rpm
656
662
668
680
693
700
706
719
732
745
759
773
787
801
816
830
845
860
868

Bhp
0.95
0.99
1.02
1.09
1.17
1.21
1.25
1.34
1.43
1.53
1.63
1.74
1.86
1.98
2.10
2.23
2.37
2.52
2.59

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
Rpm
Bhp
Rpm
Bhp
Rpm
718
1.18
776
1.43
838
841
724
1.22
781
1.78
843
730
1.26
786
1.50
849
741
1.34
796
1.59
859
753
1.43
808
1.69
864
759
1.48
814
1.74
869
764
1.52
819
1.79
880
776
1.61
831
1.89
842
2.00
892
789
1.71
854
2.11
903
802
1.81
866
2.23
915
815
1.92
878
2.35
926
828
2.04
841
2.16
891
2.48
938
950
854
2.29
904
2.61
963
867
2.42
917
2.75
976
881
2.56
930
2.90
943
3.05
988
895
2.71
956
3.22
—
909
2.87
917
2.95
963
3.30
—

1.4
Bhp
1.78
1.81
1.83
1.88
1.96
2.01
2.06
2.17
2.29
2.42
2.54
2.67
2.81
2.95
3.10
3.25
3.41
—
—

Rpm
898
902
905
910
912
915
918
927
938
949
961
972
983
995
1007
—
—
—
—

1.6
Bhp
2.21
2.25
2.28
2.31
2.31
2.34
2.37
2.47
2.58
2.71
2.85
3.00
3.14
3.30
3.45
—
—
—
—

Rpm
935
939
943
952
963
968
973
976
983
993
1003
1015
1026
—
—
—
—
—
—

Bhp
2.58
2.60
2.62
2.74
2.81
2.81
2.81
2.84
2.92
3.03
3.17
3.32
3.47
—
—
—
—
—
—

581B090 (71/2 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.2
Rpm
506
514
521
536
551
559
567
582
598
614
630
646
662
679
695
712
729
745
754

0.4
Bhp
0.52
0.55
0.57
0.63
0.69
0.72
0.75
0.83
0.90
0.98
1.07
1.16
1.26
1.36
1.47
1.59
1.71
1.84
1.91

Rpm
586
593
600
613
626
634
641
655
670
684
699
714
729
744
759
774
790
805
813

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.72
656
0.95
718
0.76
662
0.99
724
0.79
668
1.02
730
0.85
680
1.09
741
0.93
693
1.17
753
0.97
700
1.21
759
1.00
706
1.25
764
1.08
719
1.34
776
1.17
732
1.43
789
1.25
745
1.53
802
1.35
759
1.63
815
1.45
773
1.74
828
1.55
787
1.86
841
1.66
801
1.98
854
867
1.78
816
2.10
881
1.90
830
2.23
895
2.03
845
2.37
909
2.17
860
2.52
868
2.59
917
2.24

0.8

1.0
Bhp
1.18
1.22
1.26
1.34
1.43
1.48
1.52
1.61
1.71
1.81
1.92
2.04
2.16
2.29
2.42
2.56
2.71
2.87
2.95

Rpm
776
781
786
796
808
814
819
831
842
854
866
878
891
904
917
930
943
956
963

Bhp
2.92
2.94
2.96
3.10
3.18
3.18
3.18
3.21
3.30
3.43
3.59
3.76
3.93
4.30
4.49
4.97
5.22
5.97
6.12

Rpm
1011
1015
1020
1029
1041
1047
1052
1055
1063
1074
1084
1097
1109
1127
1141
1167
1181
1218
1227

Bhp
1.43
1.48
1.50
1.59
1.69
1.74
1.79
1.89
2.00
2.11
2.23
2.35
2.48
2.61
2.75
2.90
3.05
3.22
3.30

581B090 (71/2 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

Bhp
FIOP

—
—

1.2
Rpm
838
841
843
849
859
864
869
880
892
903
915
926
938
950
963
976
988
1019
1026

1.4
Bhp
1.78
1.81
1.83
1.88
1.96
2.01
2.06
2.17
2.29
2.42
2.54
2.67
2.81
2.95
3.10
3.25
3.41
3.90
4.00

Rpm
898
902
905
910
912
915
918
927
938
949
961
972
983
995
1007
1030
1043
1075
1083

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
2.21
935
2.58
974
2.25
939
2.60
979
2.28
943
2.62
983
2.31
952
2.74
992
2.31
963
2.81
1004
2.34
968
2.81
1009
2.37
973
2.81
1014
2.47
976
2.84
1017
2.58
983
2.92
1024
2.71
993
3.03
1035
2.85
1003
3.17
1045
3.00
1015
3.32
1058
3.14
1026
3.47
1069
1086
3.30
1043
3.80
3.45
1055
3.97
1100
1079
4.40
1125
3.82
1093
4.61
1139
4.01
4.58
1127
5.27
1174
4.70
1135
5.41
1183

1.8

2.0
Bhp
3.26
3.29
3.31
3.46
3.55
3.55
3.55
3.59
3.69
3.83
4.01
4.20
4.39
4.80
5.02
5.56
5.83
6.67
6.83

4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 2.90 for standard motors, 4.20 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 840 to 1085 rpm for standard motors; 860 to 1080 rpm
for high-static motors. All other rpms require a field-supplied drive.

30

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B102

(81/2

TONS) — STANDARD MOTOR

AIRFLOW
(Cfm)

0.2
Rpm
559
567
582
598
614
630
646
662
679
695
712
729
745
754
762
779
796
813
830
839
847

2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750
3800
3900
4000
4100
4200
4250
4300

0.4
Bhp
0.72
0.75
0.83
0.90
0.98
1.07
1.16
1.26
1.36
1.47
1.59
1.71
1.84
1.91
1.98
2.12
2.27
2.42
2.59
2.68
2.76

Rpm
634
641
655
670
684
690
714
729
744
759
774
790
805
813
821
836
852
868
884
890
900

0.6
Bhp
0.97
1.00
1.08
1.17
1.25
1.35
1.45
1.55
1.66
1.78
1.90
2.03
2.17
2.24
2.31
2.46
2.61
2.78
2.95
3.04
3.13

Rpm
700
706
719
732
745
759
773
787
801
816
830
845
860
868
875
890
905
920
935
—
—

Bhp
1.21
1.25
1.34
1.43
1.53
1.63
1.74
1.86
1.98
2.10
2.23
2.37
2.52
2.59
2.66
2.82
2.98
3.15
3.33
—
—

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
Rpm
Bhp
Rpm
Bhp
Rpm
864
759
1.48
814
1.74
869
764
1.52
819
1.79
880
776
1.61
831
1.89
842
2.00
892
789
1.71
854
2.11
903
802
1.81
866
2.23
915
815
1.92
878
2.35
926
828
2.04
841
2.16
891
2.48
938
950
854
2.29
904
2.61
963
867
2.42
917
2.75
976
881
2.56
930
2.90
943
3.05
988
895
2.71
956
3.22
—
909
2.87
917
2.95
963
3.30
—
924
3.03
970
3.38
—
938
3.19
—
—
—
953
3.37
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
2.01
2.06
2.17
2.29
2.42
2.54
2.67
2.81
2.95
3.10
3.25
3.41
—
—
—
—
—
—
—
—
—

1.4
Rpm
915
918
927
938
949
961
972
983
995
1007
—
—
—
—
—
—
—
—
—
—
—

Bhp
2.34
2.37
2.47
2.58
2.71
2.85
3.00
3.14
3.30
3.45
—
—
—
—
—
—
—
—
—
—
—

1.6
Rpm
968
973
976
983
993
1003
1016
1026
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
2.81
2.81
2.84
2.92
3.03
3.17
3.32
3.47
—
—
—
—
—
—
—
—
—
—
—
—
—

581B102 (81/2 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750
3800
3900
4000
4100
4200
4250
4300

0.2
Rpm
559
567
582
598
614
630
646
682
679
695
712
729
745
754
762
779
796
813
830
839
847

0.4
Bhp
0.72
0.75
0.83
0.90
0.98
1.07
1.16
1.26
1.36
1.47
1.59
1.71
1.84
1.91
1.98
2.12
2.27
2.42
2.59
2.68
2.76

Rpm
634
641
655
670
684
690
714
729
744
759
774
790
805
813
821
836
852
868
884
890
900

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.97
700
1.21
759
1.00
706
1.25
764
1.08
719
1.34
776
1.17
732
1.43
789
1.25
745
1.53
802
1.35
759
1.63
815
1.45
773
1.74
828
1.55
787
1.86
841
1.66
801
1.98
854
867
1.78
816
2.10
881
1.90
830
2.23
895
2.03
845
2.37
860
2.52
909
2.17
868
2.59
917
2.24
875
2.66
924
2.31
890
2.82
938
2.46
905
2.98
953
2.61
2.78
920
3.15
974
2.95
935
3.33
990
3.04
965
3.88
1022
1034
3.13
976
3.99

0.8

1.0
Bhp
1.48
1.52
1.61
1.71
1.81
1.92
2.04
2.16
2.29
2.42
2.56
2.71
2.87
2.95
3.03
3.19
3.37
3.74
3.96
4.61
4.74

Rpm
814
819
831
842
854
866
878
891
904
917
930
943
956
963
970
981
996
1019
1036
1069
1081

Bhp
3.02
3.02
3.05
3.13
3.25
3.40
3.56
3.72
3.84
4.01
4.15
4.35
4.58
4.70
4.81
5.19
5.48
6.09
6.44
7.50
7.72

Rpm
1012
1017
1021
1028
1038
1049
1062
1073
1069
1081
1081
1094
1098
1106
1114
1127
1145
1170
1190
1228
1242

Bhp
1.74
1.79
1.89
2.00
2.11
2.23
2.35
2.48
2.61
2.75
2.90
3.05
3.22
3.30
3.38
3.65
3.85
4.28
4.52
5.27
5.42

581B102 (81/2 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750
3800
3900
4000
4100
4200
4250
4300
Bhp
FIOP

—
—

1.2
Rpm
864
869
880
892
903
915
926
938
950
963
976
988
992
999
1006
1017
1034
1057
1074
1109
1121

1.4
Bhp
2.01
2.06
2.17
2.29
2.42
2.54
2.67
2.81
2.95
3.10
3.25
3.41
3.59
3.68
3.77
4.07
4.30
4.77
5.05
5.88
6.05

Rpm
915
918
927
938
949
961
972
983
995
1007
1007
1019
1023
1030
1038
1049
1066
1090
1108
1143
1156

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
2.34
968
2.81
991
2.37
973
2.81
996
2.47
976
2.84
999
2.58
983
2.92
1006
2.71
993
3.03
1017
2.85
1003
3.17
1027
3.00
1016
3.32
1040
3.14
1026
3.47
1050
3.30
1022
3.58
1046
3.45
1034
3.74
1059
3.56
1034
3.86
1058
3.74
1047
4.05
1071
1050
4.27
1075
3.94
4.04
1058
4.38
1083
1066
4.48
1091
4.14
4.46
1077
4.84
1103
4.71
1095
5.11
1121
5.24
1119
5.67
1146
5.54
1138
6.00
1165
6.45
1174
6.98
1202
6.64
1188
7.19
1216

2.0
Bhp
3.21
3.21
3.25
3.34
3.46
3.62
3.80
3.97
4.09
4.27
4.42
4.63
4.88
5.00
5.12
5.53
5.84
6.49
6.86
7.98
8.22

4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 2.90 for standard motors, 4.20 for high-static
motors. Extensive motor and electrical testing on these units ensures that
the full range of the motor can be utilized with confidence. Using your fan
motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. See Evaporator-Fan
Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.

1.8

indicates field-supplied motor and drive required.

3. Motor drive range is 840 to 1085 rpm for standard motors, 860 to 1080 rpm
for high-static motors. All other rpms require a field-supplied drive.

31

PERFORMANCE DATA (cont)
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
581B120 (10 TONS) — STANDARD AND HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

Bhp
FIOP

—
—

0.2
Rpm Bhp
556
0.65
569
0.70
583
0.76
597
0.83
611
0.90
625
0.97
639
1.04
729
1.36
745
1.46
761
1.56
777
1.67
793
1.79
810
1.91
826
2.04
842
2.17
859
2.31
876
2.45
892
2.60
909
2.77
926
2.93
942
3.11

0.4
Rpm Bhp
624
0.81
636
0.87
649
0.94
662
1.00
675
1.08
688
1.15
701
1.23
790
1.58
805
1.69
820
1.80
836
1.92
851
2.05
867
2.18
883
2.32
898
2.46
914
2.60
930
2.76
945
2.91
961
3.07
977
3.24
993
3.41

0.6
Rpm Bhp
682 0.95
693 1.01
705 1.08
717 1.16
730 1.23
742 1.32
755 1.41
847 1.79
861 1.89
875 2.01
889 2.14
904 2.27
918 2.41
933 2.55
948 2.70
962 2.85
977 3.01
992 3.18
1008 3.36
1024 3.54
1039 3.73

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
737 0.99
745 1.04
750 1.12
809 1.24
862 1.38
748 1.08
755 1.12
757 1.20
905 1.52
758 1.17
787 1.30
769 1.36
965 1.82
770 1.29
815 1.37
780 1.43
830 1.50
838 1.63
992 2.11
781 1.41
840 1.64
860 1.85 1011 2.45
792 1.49
850 1.87
890 2.21 1026 2.55
803 1.57
902 2.06
955 2.29 1008 2.55 1060 2.80
915 2.17
967 2.41 1019 2.67 1070 2.94
928 2.29
979 2.55 1029 2.80 1079 3.07
941 2.40
991 2.68 1040 2.94 1089 3.22
955 2.52 1004 2.82 1052 3.08 1100 3.36
968 2.65 1017 2.96 1064 3.23 1110 3.51
982 2.79 1030 3.11 1076 3.40 1121 3.67
996 2.93 1043 3.25 1088 3.56 1133 3.84
1010 3.09 1056 3.40 1101 3.73 1144 4.00
1024 3.26 1070 3.55 1114 3.90 1157 4.19
1039 3.43 1083 3.71 1126 4.07 1169 4.38
1053 3.61 1097 3.88 1140 4.25 1181 4.58
1068 3.80 1111 4.06 1153 4.41 1194 4.77
1080 3.99 1125 4.25 1166 4.59 1207 4.97

1.8
Rpm Bhp
899 1.56
943 1.88
982 2.19
1000 2.40
1030 2.62
1072 2.74
1095 2.89
1152 3.27
1163 3.44
1173 3.60
1183 3.76
1193 3.93
1202 4.09
1212 4.27
1222 4.44
1232 4.62
1242 4.81
1252 5.00
1263 5.20
—
—
—
—

2.0
Rpm Bhp
950 1.92
971 2.21
992 2.41
1025 2.59
1050 2.72
1099 2.90
1119 3.08
1190 3.46
1203 3.65
1214 3.83
1225 4.00
1236 4.19
1245 4.38
1255 4.56
1265 4.74
1274 4.93
1284 5.13
—
—
—
—
—
—
—
—

4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 3.70 for standard motors, 5.25 for high-static
motors. Extensive motor and electrical testing on these units ensures that
the full range of the motor can be utilized with confidence. Using your fan
motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. See Evaporator-Fan
Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.

1.6
Rpm Bhp
875 1.40
903 1.53
971 1.86
991 2.10
1015 2.43
1028 2.62
1063 2.75
1108 3.05
1118 3.19
1128 3.34
1137 3.49
1147 3.65
1157 3.81
1167 3.97
1178 4.14
1188 4.31
1199 4.49
1210 4.68
1222 4.87
1234 5.09
—
—

indicates high static motor and drive required.

3. Motor drive range is 860 to 1080 rpm for standard motors; 830 to 1130 rpm
for high-static motors. All other rpms require a field-supplied drive.

581B150 (121/2 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

Bhp
FIOP

—
—

0.2
Rpm Bhp
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
876 2.45
892 2.60
909 2.77
926 2.93
942 3.11
959 3.29
976 3.47
993 3.67
1010 3.87
1027 4.07
1043 4.29
1060 4.51
1077 4.74
1094 4.98
1111 5.22
—
—
—
—

0.4
Rpm Bhp
—
—
—
—
—
—
—
—
—
—
867 2.18
883 2.32
898 2.46
914 2.60
930 2.76
945 2.91
961 3.07
977 3.24
993 3.41
1009 3.60
1025 3.78
1041 3.98
1057 4.18
1073 4.39
1090 4.61
1106 4.83
1122 5.07
—
—
—
—
—
—
—
—

0.6
Rpm Bhp
—
—
861 1.89
875 2.01
889 2.14
904 2.27
918 2.41
933 2.55
948 2.70
962 2.85
977 3.01
992 3.18
1008 3.36
1024 3.54
1039 3.73
1055 3.92
1071 4.12
1086 4.33
1102 4.54
1118 4.76
1133 4.99
1149 5.22
—
—
—
—
—
—
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
902 2.06
955 2.29 1008 2.55 1060 2.80
915 2.17
967 2.41 1019 2.67 1070 2.94
928 2.29
979 2.55 1029 2.80 1079 3.07
941 2.40
991 2.68 1040 2.94 1089 3.22
955 2.52 1004 2.82 1052 3.08 1100 3.36
968 2.65 1017 2.96 1064 3.23 1110 3.51
982 2.79 1030 3.11 1076 3.40 1121 3.67
996 2.93 1043 3.25 1088 3.56 1133 3.84
1010 3.09 1056 3.40 1101 3.73 1144 4.00
1024 3.26 1070 3.55 1114 3.90 1157 4.19
1039 3.43 1083 3.71 1126 4.07 1169 4.38
1053 3.61 1097 3.88 1140 4.25 1181 4.58
1068 3.80 1111 4.06 1153 4.41 1194 4.77
1080 3.99 1125 4.25 1166 4.59 1207 4.97
1097 4.19 1139 4.46 1180 4.78 1220 5.18
1112 4.40 1153 4.67 1194 4.98
—
—
1127 4.61 1168 4.90 1208 5.19
—
—
1142 4.84 1182 5.13
—
—
—
—
1157 5.07
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

1.6
Rpm Bhp
1108 3.05
1118 3.19
1128 3.34
1137 3.49
1147 3.65
1157 3.81
1167 3.97
1178 4.14
1188 4.31
1199 4.49
1210 4.68
1222 4.87
1234 5.09
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

1.8
Rpm Bhp
1152 3.27
1163 3.44
1173 3.60
1183 3.76
1193 3.93
1202 4.09
1212 4.27
1222 4.44
1232 4.62
1242 4.81
1252 5.00
1263 5.20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2.0
Rpm Bhp
1190 3.46
1203 3.65
1214 3.83
1225 4.00
1236 4.19
1245 4.38
1255 4.56
1265 4.74
1274 4.93
1284 5.13
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

4. Maximum continuous bhp is 5.25 for standard motor. Extensive motor and
electrical testing on these units ensures that the full range of the motor can
be utilized with confidence. Using your fan motors up to the ratings shown
will not result in nuisance tripping or premature motor failure. Unit warranty
will not be affected. See Evaporator-Fan Motor Data table on pages 41 and
42 for additional information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
6. Interpolation is permissible. Do not extrapolate.

LEGEND
Brake Horsepower Input to Fan
Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 2.)
2. Standard drive range is 900 to 1260 rpm.
3. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

32

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS
581B036 (3 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.1
Rpm
526
570
614
658
703
725
755

Bhp
0.08
0.13
0.16
0.23
0.27
0.31
0.38

EXTERNAL STATIC PRESSURE (in. wg)
0.3
0.4
Rpm
Bhp
Rpm
Bhp
656
0.12
734
0.22
800
0.26
738
0.19
812
0.29
758
0.23
780
0.28
840
0.32
808
0.32
868
0.37
845
0.38
891
0.42
870
0.43
924
0.48

Rpm
818
848
863
889
916
937
969

Bhp
0.35
0.39
0.43
0.50
0.56
0.60
0.68

EXTERNAL STATIC PRESSURE (in. wg)
0.9
1.0
Rpm
Bhp
Rpm
Bhp
989
0.38
1028
0.42
1020
0.44
1064
0.48
1052
0.49
1100
0.52
1076
0.53
1136
0.59
1094
0.61
1172
0.65
1108
0.67
1208
0.70
1117
0.70
1245
0.74

Rpm
1074
1124
1163
1201
1239
1278
1315

0.2
Bhp
0.06
0.09
0.13
0.16
0.20
0.29
0.33

Rpm
584
627
670
710
752
776
816

0.5

0.6
Bhp
0.25
0.29
0.32
0.36
0.41
0.47
0.53

Rpm
875
895
914
938
963
983
1014

Bhp
0.45
0.52
0.56
0.61
0.69
0.75
0.80

Rpm
1120
1185
1225
1266
1306
1347
1385

Bhp
0.27
0.31
0.35
0.40
0.45
0.51
0.58

581B036 (3 TONS) — STANDARD MOTOR (cont)
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.7
Rpm
924
936
960
988
1012
1027
1056

0.8
Bhp
0.32
0.35
0.39
0.45
0.51
0.56
0.63

Rpm
953
977
1005
1038
1061
1071
1097

1.1

1.2
Bhp
0.50
0.55
0.60
0.64
0.72
0.79
0.85

581B036 (3 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

0.2
Rpm
584
627
670
710
752
776
816

0.4
Bhp
0.08
0.13
0.16
0.23
0.27
0.31
0.38

Rpm
734
800
812
840
868
891
924

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.22
875
0.27
953
0.26
895
0.31
977
0.29
914
0.35
1005
0.32
938
0.40
1038
0.37
963
0.45
1061
0.42
983
0.51
1071
1097
0.48
1014
0.58

0.8

1.0
Bhp
0.36
0.39
0.43
0.50
0.56
0.60
0.68

Rpm
1028
1064
1100
1136
1172
1208
1245

Bhp
0.69
0.77
0.83
0.92
1.01
1.11
1.22

Rpm
1240
1312
1357
1402
1446
1492
1534

Bhp
0.42
0.48
0.52
0.59
0.65
0.70
0.74

581B036 (3 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
900
1000
1100
1200
1300
1400
1500

1.2
Rpm
1120
1185
1225
1266
1306
1347
1385

1.4
Bhp
0.54
0.60
0.65
0.72
0.79
0.87
0.96

Rpm
1155
1222
1263
1306
1347
1389
1428

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
0.59
1186
0.64
1215
0.66
1255
0.71
1285
0.71
1298
0.77
1328
0.79
1341
0.86
1373
0.87
1383
0.94
1416
0.95
1427
1.03
1461
1.05
1467
1.14
1502

1.8

2.0
Bhp
0.73
0.82
0.88
0.98
1.07
1.18
1.30

4. Maximum continuous bhp is 1.20 for standard motors; 2.40 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Bryant representative to verify.
6. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2. Motor drive range is 760 to 1090 rpm for standard motors; 1075 to 1455 rpm
for high-static motors. All other rpms require a field-supplied drive.
3. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

33

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B048 (4 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

0.1
Rpm
569
604
640
676
713
750
788
826
864

Rpm
701
731
761
793
825
857
890
924
958

EXTERNAL STATIC PRESSURE (in. wg)
0.3
0.4
0.6
Bhp
Rpm
Bhp
Rpm
859
0.29
761
0.34
887
0.34
788
0.39
914
0.39
817
0.45
847
0.51
940
0.45
877
0.58
967
0.51
0.59
908
0.66
997
0.67
939
0.75
1026
0.76
971
0.84
1056
0.86
1004
0.94
1087

Bhp
0.46
0.52
0.59
0.65
0.73
0.81
0.91
1.01
1.12

Rpm
901
928
955
982
1009
1037
1065
1094
1125

Rpm
1068
1086
1104
1129
1156
1183
1211
1238
1265

EXTERNAL STATIC PRESSURE (in. wg)
1.1
1.2
1.4
Bhp
Rpm
Bhp
Rpm
0.79
1106
0.87
1134
0.84
1128
0.91
1183
0.93
1139
1.01
1218
1.02
1162
1.09
1228
1250
1.13
1185
1.20
1.23
1215
1.31
1276
1.35
1243
1.43
1303
1.47
1271
1.56
1330
1.59
1298
1.69
1358

Bhp
0.98
1.10
1.14
1.24
1.35
1.48
1.61
1.74
1.89

Rpm
1189
1226
1286
1303
1319
1334
1359
1386
1413

0.2
Bhp
0.18
0.22
0.27
0.32
0.38
0.45
0.52
0.60
0.70

Rpm
641
673
705
738
772
806
841
876
912

Bhp
0.23
0.28
0.33
0.38
0.44
0.51
0.59
0.68
0.77

0.7

0.8
Bhp
0.52
0.59
0.66
0.73
0.81
0.90
1.01
1.10
1.21

Rpm
943
968
996
1024
1051
1077
1104
1132
1162

Bhp
1.12
1.23
1.34
1.40
1.51
1.64
1.78
1.93
2.08

Rpm
1245
1297
1320
1343
1382
1398
1418
1439
1466

Bhp
0.58
0.65
0.72
0.81
0.89
1.01
1.07
1.18
1.30

581B048 (4 TONS) — STANDARD MOTOR (cont)
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

0.9
Rpm
987
1006
1033
1060
1087
1114
1141
1168
1197

1.0
Bhp
0.64
0.71
0.79
0.88
1.01
1.07
1.17
1.28
1.39

Rpm
1030
1044
1069
1095
1123
1151
1178
1204
1231

Bhp
0.70
0.77
0.86
0.95
1.05
1.15
1.26
1.37
1.48

1.6

1.8
Bhp
1.21
1.35
1.48
1.60
1.68
1.80
1.95
2.11
2.27

581B048 (4 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

0.2
Rpm
641
673
705
738
772
806
841
876
912

0.4
Bhp
0.23
0.28
0.33
0.38
0.44
0.51
0.59
0.68
0.77

Rpm
761
788
817
847
877
908
939
971
1004

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.34
859
0.46
943
0.39
887
0.52
968
0.45
914
0.59
996
0.51
940
0.65
1024
0.58
967
0.73
1051
1077
0.66
997
0.81
1104
0.75
1026
0.91
1132
0.84
1056
1.01
1087
1.12
1162
0.94

0.8

1.0
Bhp
0.58
0.65
0.72
0.81
0.89
1.01
1.07
1.18
1.30

Rpm
1030
1044
1069
1095
1123
1151
1178
1204
1231

Bhp
0.70
0.77
0.86
0.95
1.05
1.15
1.26
1.37
1.48

581B048 (4 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
1200
1300
1400
1500
1600
1700
1800
1900
2000

1.2
Rpm
1106
1128
1139
1162
1185
1215
1243
1271
1298

1.4
Bhp
0.87
0.91
1.01
1.09
1.20
1.31
1.43
1.56
1.69

Rpm
1134
1183
1218
1228
1250
1276
1303
1330
1358

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
0.98
1189
1.12
1245
1.10
1226
1.23
1297
1.14
1286
1.34
1320
1.24
1303
1.40
1343
1.35
1319
1.51
1382
1.48
1334
1.64
1398
1.61
1359
1.78
1418
1.74
1386
1.93
1439
1.89
1413
2.08
1466

1.8

2.0
Bhp
1.21
1.35
1.48
1.60
1.68
1.80
1.95
2.11
2.27

Rpm
1292
1346
1370
1393
1434
1451
1471
1493
1521

Bhp
1.35
1.51
1.65
1.79
1.88
2.01
2.18
2.36
2.54

5. Maximum continuous bhp is 1.20 for standard motors; 2.40 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 840 to 1185 rpm for standard units; 1075 to 1455 rpm for
high-static motors. All other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

34

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B060 (5 TONS) — STANDARD MOTOR — SINGLE-PHASE UNITS
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
0.1
0.2
0.4
0.6
0.8
1.0
(Cfm)
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1073
0.80
1154
0.95
1500
741
0.38
798
0.43
895
0.54
990
0.67
1102
0.90
1182
1.04
1600
783
0.45
838
0.51
933
0.63
1016
0.75
1049
0.84
1134
1.00
1206
1.14
1700
825
0.53
878
0.60
969
0.72
1047
0.90
1139
1.05
1193
1.14
1276
1.30
1800
885
0.63
942
0.73
1301
1.38
1084
1.02
1160
1.11
1223
1.24
1900
928
0.73
982
0.83
1254
1.36
1329
1.44
1022
0.94
1121
1.12
1188
1.22
2000
971
0.84
1272
1.45
1354
1.58
1063
1.10
1140
1.18
1196
1.27
2100
1015
0.97
1060
1.10
1104
1.20
1159
1.23
1229
1.41
1306
1.53
1363
1.70
2200
1196
1.37
1264
1.56
1340
1.66
1397
1.86
1104
1.25
1130
1.27
2300
1174
1.37
1245
1.57
1305
1.63
1373
1.84
1440
1.95
1138
1.30
2400
1183
1.43
1201
1.50
1284
1.65
1338
1.75
1402
1.99
1469
2.04
2500

1.2
Bhp
1218
1251
1281
1341
1374
1396
1413
1434
1459
1502
1524

1.4
Rpm
1.12
1.20
1.31
1.40
1.53
1.66
1.75
1.81
1.88
2.06
2.24

Bhp
1295
1310
1342
1413
1437
1460
1475
1487
1520
1552
1585

Rpm
1.12
1.20
1.31
1.40
1.53
1.66
1.75
1.81
1.88
2.06
2.24

Bhp
1295
1310
1342
1413
1437
1460
1475
1487
1520
1552
1585

1.6
Rpm
1.36
1.40
1.48
1.55
1.62
1.68
1.73
1.85
2.07
2.24
2.42

Bhp
1360
1385
1398
1474
1490
1509
1529
1554
1576
1604
1638

Rpm
1.36
1.40
1.48
1.55
1.62
1.68
1.73
1.85
2.07
2.24
2.42

Bhp
1360
1385
1398
1474
1490
1509
1529
1554
1576
1604
1638

Rpm
1.40
1.49
1.53
1.58
1.67
1.77
1.92
2.07
2.24
2.42
2.60

581B060 (5 TONS) — STANDARD MOTOR — 3-PHASE UNITS
AIRFLOW
(Cfm)
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

0.1
Rpm
Bhp
741
0.38
783
0.45
825
0.53
885
0.63
928
0.73
971
0.84
1015
0.97
1060
1.10
1104
1.25
1138
1.30
1183
1.43

0.2
Rpm
798
838
878
942
982
1022
1063
1104
1130
1174
1201

Bhp
0.43
0.51
0.60
0.73
0.83
0.94
1.10
1.20
1.27
1.37
1.50

0.4
Rpm
895
933
969
1047
1084
1121
1140
1159
1196
1245
1284

Bhp
0.54
0.63
0.72
0.90
1.02
1.12
1.18
1.23
1.37
1.57
1.65

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1154
0.95
990
0.67
1073
0.80
1182
1.04
1016
0.75
1102
0.90
1134
1.00
1206
1.14
1049
0.84
1139
1.05
1193
1.14
1276
1.30
1160
1.11
1223
1.24
1301
1.38
1188
1.22
1254
1.36
1329
1.44
1196
1.27
1272
1.45
1354
1.58
1229
1.41
1306
1.53
1363
1.70
1264
1.56
1340
1.66
1397
1.86
1305
1.63
1373
1.84
1440
1.95
1338
1.75
1402
1.99
1469
2.04

1.2
Bhp
1218
1251
1281
1341
1374
1396
1413
1434
1459
1502
1524

1.4

1.6
Rpm
1.40
1.49
1.53
1.58
1.67
1.77
1.92
2.07
2.24
2.42
2.60

581B060 (5 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

0.2
Rpm
789
826
865
905
945
984
1024
1064
1104
1145
1186

0.4
Bhp
0.40
0.46
0.54
0.62
0.72
0.82
0.93
1.05
1.18
1.32
1.48

Rpm
896
931
966
1002
1037
1072
1108
1145
1183
1222
1262

EXTERNAL STATIC PRESSURE (in. wg)
0.6
Bhp
Rpm
Bhp
Rpm
0.53
990
0.67
1072
0.61
1020
0.75
1101
0.69
1051
0.84
1133
0.78
1084
0.93
1163
0.88
1119
1.04
1194
0.98
1154
1.16
1226
1.10
1192
1.29
1259
1.22
1225
1.43
1294
1330
1.36
1260
1.57
1365
1.45
1296
1.73
1331
1.89
1400
1.68

0.8

1.0
Bhp
0.83
0.91
1.01
1.10
1.21
1.33
1.47
1.62
1.78
1.94
2.12

Rpm
1153
1178
1205
1235
1266
1297
1327
1359
1392
1426
1461

Bhp
1.22
1.61
1.89
2.09
2.25
2.40
2.55
2.71
2.88
3.07
3.28

Rpm
1345
1373
1470
1528
1566
1594
1620
1645
1676
1710
1746

Bhp
1.00
1.09
1.18
1.29
1.40
1.53
1.66
1.80
1.97
2.15
2.34

581B060 (5 TONS) — HIGH-STATIC MOTOR (cont)
AIRFLOW
(Cfm)
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500

1.2
Rpm
1221
1252
1278
1303
1330
1362
1393
1423
1454
1485
1518

1.4
Bhp
1.17
1.27
1.37
1.48
1.59
1.73
1.87
2.02
2.18
2.36
2.55

Rpm
1256
1311
1345
1371
1396
1422
1452
1483
1515
1544
1574

EXTERNAL STATIC PRESSURE (in. wg)
1.6
Bhp
Rpm
Bhp
Rpm
1283
1.32
1303
1.30
1.45
1340
1.58
1330
1.57
1397
1.76
1424
1.69
1433
1.90
1480
1.80
1460
2.03
1517
1.94
1485
2.16
1544
2.08
1510
2.31
1570
2.24
1538
2.46
1594
2.41
1571
2.64
1623
1657
2.59
1604
2.84
1633
3.03
1692
2.78

1.8

2.0
Bhp
1.34
1.77
2.08
2.30
2.47
2.64
2.80
2.98
3.17
3.38
3.61

5. Maximum continuous bhp is 1.30 for single-phase standard units, 2.40 for
3-phase standard motors, and 2.90 for high-static motors. Extensive motor
and electrical testing on these units ensures that the full range of the motor
can be utilized with confidence. Using your fan motors up to the ratings shown
will not result in nuisance tripping or premature motor failure. Unit warranty
will not be affected. See Evaporator-Fan Motor Data tables on pages 41 and
42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 1020 to 1460 rpm for single-phase standard units, 1120
to 1585 for 3-phase standard units, and 1300 to 1685 for high-static units. All
other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

35

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B072 (6 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000

0.1
Rpm
885
928
971
1015
1060
1104
1138
1183
1210
1254
1274
1318
1362

0.2
Bhp
0.63
0.73
0.84
0.97
1.10
1.25
1.30
1.43
1.58
1.76
1.82
1.95
2.20

Rpm
942
982
1022
1063
1104
1130
1174
1201
1243
1285
1304
1345
1378

0.4
Bhp
0.73
0.83
0.94
1.10
1.20
1.27
1.37
1.50
1.67
1.80
1.85
2.05
2.30

Rpm
1047
1084
1121
1140
1159
1196
1245
1284
1312
1354
1374
1412
1451

Bhp
0.90
1.02
1.12
1.18
1.23
1.37
1.57
1.65
1.76
1.95
2.12
2.32
2.40

EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
1139
1.05
1193
1.14
1276
1.30
1160
1.11
1223
1.24
1301
1.38
1188
1.22
1254
1.36
1329
1.44
1196
1.27
1272
1.45
1354
1.58
1229
1.41
1306
1.53
1363
1.70
1264
1.56
1340
1.66
1397
1.86
1305
1.63
1373
1.84
1440
1.95
1338
1.75
1402
1.99
1469
2.04
1366
1.96
1435
2.10
1494
2.19
1536
2.46
1403
2.14
1474
2.21
1459
2.25
1514
2.42
1570
2.66
1496
2.45
1529
2.61
1603
2.87
1534
2.66
1560
2.81
1611
3.01

1.2
Rpm
1341
1374
1396
1413
1434
1459
1502
1524
1552
1584
1624
1671
—

1.4
Bhp
1.40
1.53
1.66
1.75
1.81
1.88
2.06
2.24
2.40
2.61
2.85
3.03
—

Rpm
1413
1437
1460
1475
1487
1520
1552
1585
1616
1646
1677
—
—

1.6
Bhp
1.55
1.62
1.68
1.73
1.85
2.07
2.24
2.42
2.63
2.83
2.99
—
—

Rpm
1474
1490
1509
1529
1554
1576
1604
1638
1671
1706
—
—
—

Bhp
1.58
1.67
1.77
1.92
2.07
2.24
2.42
2.60
2.80
2.97
—
—
—

581B072 (6 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000

0.2
Rpm Bhp
942 0.73
982 0.83
1022 0.94
1063 1.10
1104 1.20
1130 1.27
1174 1.37
1201 1.50
1246 1.67
1285 1.80
1304 1.85
1345 2.05
1378 2.30

0.4
Rpm Bhp
1047 0.90
1084 1.02
1121 1.12
1140 1.18
1159 1.23
1196 1.37
1245 1.57
1284 1.65
1312 1.76
1354 1.95
1374 2.12
1412 2.32
1451 2.40

0.6
Rpm Bhp
1139 1.05
1160 1.11
1188 1.22
1196 1.27
1229 1.41
1264 1.56
1305 1.63
1338 1.75
1366 1.96
1403 2.14
1459 2.25
1496 2.54
1534 2.66

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
1193 1.14 1276 1.30 1341 1.40 1413 1.55
1223 1.24 1301 1.38 1374 1.53 1437 1.62
1264 1.36 1329 1.44 1396 1.66 1460 1.68
1272 1.45 1354 1.58 1413 1.75 1475 1.73
1306 1.53 1363 1.70 1434 1.81 1487 1.85
1340 1.66 1397 1.86 1459 1.88 1520 2.07
1373 1.84 1440 1.95 1502 2.06 1552 2.24
1402 1.99 1469 2.04 1524 2.24 1585 2.42
1435 2.10 1494 2.19 1552 2.40 1616 2.63
1474 2.21 1536 2.46 1584 2.61 1646 2.83
1514 2.42 1570 2.66 1624 2.85 1677 2.99
1529 2.61 1603 2.87 1671 3.03 1742 3.43
1560 2.81 1611 3.01 1692 3.49 1764 3.95

1.6
Rpm Bhp
1474 1.58
1490 1.67
1509 1.77
1529 1.92
1554 2.07
1576 2.24
1604 2.42
1638 2.60
1671 2.80
1706 2.97
1739 3.33
—
—
—
—

1.8
Rpm Bhp
1522 1.74
1538 1.84
1558 1.95
1578 2.11
1604 2.28
1627 2.46
1656 2.66
1691 2.86
1726 3.09
1761 3.27
1795 3.67
—
—
—
—

2.0
Rpm Bhp
1566 1.89
1583 2.00
1603 2.12
1624 2.30
1651 2.48
1674 2.68
1704 2.90
1740 3.12
1775 3.35
—
—
—
—
—
—
—
—

5. Maximum continuous bhp is 2.4 for standard motors; 2.9 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 1120 to 1585 rpm for standard motors; 1300 to 1685 rpm
for high-static motors. All other rpms require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

36

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B090 (71/2 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.2
Rpm
499
507
513
528
542
550
557
573
588
604
620
636
652
668
684
701
717
733
742

0.4
Bhp
0.50
0.53
0.55
0.60
0.66
0.69
0.72
0.79
0.86
0.94
1.02
1.11
1.21
1.31
1.41
1.53
1.65
1.77
1.84

Rpm
580
586
592
606
619
627
634
648
662
676
690
704
718
732
747
762
777
792
800

0.6
Bhp
0.70
0.73
0.76
0.83
0.90
0.94
0.97
1.05
1.13
1.21
1.30
1.39
1.49
1.59
1.70
1.82
1.94
2.07
2.14

Rpm
652
658
663
674
686
692
698
711
723
737
750
764
778
793
807
821
835
849
856

Bhp
0.94
0.97
1.00
1.06
1.13
1.17
1.21
1.29
1.38
1.48
1.58
1.69
1.80
1.92
2.04
2.16
2.29
2.42
2.49

EXTERNAL STATIC PRESSURE (in. wg)
0.8
0.9
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
717
1.17
748
1.30
779
1.43
722
1.22
752
1.34
783
1.46
727
1.26
756
1.38
786
1.49
738
1.34
766
1.46
795
1.58
748
1.41
777
1.55
806
1.68
754
1.45
783
1.60
812
1.74
759
1.49
787
1.64
816
1.79
770
1.58
798
1.73
827
1.88
782
1.66
809
1.82
837
1.98
848
2.08
794
1.76
821
1.92
849
2.18
806
1.86
832
2.02
844
2.13
870
2.29
818
1.97
856
2.25
882
2.40
831
2.09
844
2.21
869
2.37
894
2.53
857
2.35
882
2.51
907
2.66
871
2.48
895
2.64
919
2.80
932
2.95
885
2.63
908
2.79
922
2.95
945
3.11
899
2.78
907
2.86
929
3.03
952
3.20

1.2
Rpm
839
843
846
853
859
864
868
878
889
900
910
920
931
942
954
966
978
990
997

1.4
Bhp
1.78
1.81
1.84
1.88
1.94
1.99
2.04
2.16
2.29
2.41
2.52
2.64
2.76
2.89
3.02
3.15
3.30
3.45
3.54

Rpm
905
908
910
912
919
920
921
928
937
947
958
968
979
989
1000
1011
1022
1034
1040

Bhp
2.21
2.25
2.25
2.31
2.37
2.39
2.41
2.45
2.57
2.70
2.85
2.99
3.13
3.26
3.40
3.55
3.69
3.84
3.93

1.6
Rpm
951
955
959
967
971
974
976
983
986
993
1002
1012
1023
1034
1044
1054
1065
1076
1082

Bhp
2.57
2.59
2.61
2.68
2.73
2.76
2.78
2.88
2.91
3.01
3.15
3.30
3.47
3.63
3.79
3.94
4.10
4.26
5.27

5. Maximum continuous bhp is 2.9 for standard motors. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. See Evaporator-Fan Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 840 to 1085 rpm for standard motors. All other rpms
require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

581B090 (71/2 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.2
Rpm Bhp
499
0.50
507
0.53
513
0.55
528
0.60
542
0.66
550
0.69
557
0.72
573
0.79
588
0.86
604
0.94
620
1.02
636
1.11
652
1.21
668
1.31
684
1.41
701
1.53
717
1.65
733
1.77
742
1.84

0.4
Rpm Bhp
580
0.70
586
0.73
592
0.76
606
0.83
619
0.90
627
0.94
634
0.97
648
1.05
662
1.13
676
1.21
690
1.30
704
1.39
718
1.49
732
1.59
747
1.70
762
1.82
777
1.94
792
2.07
800
2.14

0.6
Rpm Bhp
652
0.94
658
0.97
663
1.00
674
1.06
686
1.13
692
1.17
698
1.21
711
1.29
723
1.38
737
1.48
750
1.58
764
1.69
778
1.80
793
1.92
807
2.04
821
2.16
835
2.29
849
2.42
856
2.49

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
905 2.21
717
1.17
779
1.43
839
1.78
908 2.25
722
1.22
783
1.46
843
1.81
910 2.25
727
1.26
786
1.49
846
1.84
912 2.31
738
1.34
795
1.58
853
1.88
919 2.37
748
1.41
806
1.68
859
1.94
864
1.99
920 2.39
754
1.45
812
1.74
868
2.04
921 2.41
759
1.49
816
1.79
878
2.16
928 2.45
770
1.58
827
1.88
889
2.29
937 2.57
782
1.66
837
1.98
900
2.41
947 2.70
794
1.76
848
2.08
910
2.52
958 2.85
806
1.86
849
2.18
870
2.29
920
2.64
968 2.99
818
1.97
882
2.40
931
2.76
979 3.13
831
2.09
894
2.53
942
2.89
989 3.26
844
2.21
907
2.66
954
3.02 1000 3.40
857
2.35
871
2.48
919
2.80
966
3.15 1011 3.55
885
2.63
932
2.95
978
3.30 1022 3.69
899
2.78
945
3.11
990
3.45 1034 3.84
907
2.86
952
3.20
997
3.54 1040 3.93

1.6
Rpm Bhp
951 2.57
955 2.59
959 2.61
967 2.68
971 2.73
974 2.76
976 2.78
983 2.88
986 2.91
993 3.01
1002 3.15
1012 3.30
1023 3.47
1034 3.63
1044 3.79
1054 3.94
1065 4.10
1076 4.26
1082 4.27

1.8
Rpm Bhp
986 2.87
991 2.89
995 2.91
1003 2.99
1007 3.05
1010 3.08
1012 3.10
1020 3.21
1023 3.25
1030 3.36
1039 3.51
1050 3.69
1061 3.87
1072 4.05
1083 4.23
1093 4.40
1105 4.57
1116 4.75
1122 4.78

2.0
Rpm Bhp
1019 3.16
1023 3.19
1028 3.21
1036 3.30
1041 3.36
1044 3.40
1046 3.42
1053 3.54
1057 3.58
1064 3.70
1074 3.88
1084 4.06
1096 4.27
1108 4.47
1119 4.66
1129 4.85
1141 5.05
1153 5.24
1159 5.25

5. Maximum continuous bhp is 4.2 for high-static motors. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. See Evaporator-Fan Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 860 to 1080 rpm for high-static motors. All other rpms
require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

37

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B102 (81/2 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750
3800
3900
4000
4100
4200
4250
4300

0.2
Rpm
550
557
573
588
604
620
636
652
668
684
701
717
733
742
750
767
783
800
817
826
834

0.4
Bhp
0.69
0.72
0.79
0.86
0.94
1.02
1.11
1.21
1.31
1.41
1.53
1.65
1.77
1.84
1.90
2.04
2.18
2.34
2.49
2.58
2.66

Rpm
627
634
648
662
676
690
704
718
732
747
762
777
792
800
807
822
838
854
869
877
885

0.6
Bhp
0.94
0.97
1.05
1.13
1.21
1.30
1.39
1.49
1.59
1.70
1.82
1.94
2.07
2.14
2.21
2.35
2.50
2.66
2.82
2.91
3.00

Rpm
692
698
711
723
737
750
764
778
793
807
821
835
849
856
863
877
891
905
920
928
935

Bhp
1.17
1.21
1.29
1.38
1.48
1.58
1.69
1.80
1.92
2.04
2.16
2.29
2.42
2.49
2.56
2.71
2.86
3.02
3.19
3.28
3.37

EXTERNAL STATIC PRESSURE (in. wg)
0.8
0.9
1.0
Rpm
Bhp
Rpm
Bhp
Rpm
Bhp
754
1.45
783
1.60
812
1.74
759
1.49
787
1.64
816
1.79
770
1.58
798
1.73
827
1.88
782
1.66
809
1.82
837
1.98
848
2.08
794
1.76
821
1.92
849
2.18
806
1.86
832
2.02
844
2.13
870
2.29
818
1.97
856
2.25
882
2.40
831
2.09
844
2.21
869
2.37
894
2.53
857
2.35
882
2.51
907
2.66
871
2.48
895
2.64
919
2.80
885
2.63
908
2.79
932
2.95
922
2.95
945
3.11
899
2.78
929
3.03
952
3.20
907
2.86
914
2.93
936
3.11
958
3.28
928
3.09
950
3.27
972
3.45
942
3.26
964
3.45
986
3.63
956
3.43
978
3.62
1000
3.81
970
3.60
992
3.80
1015
4.00
977
3.69
999
3.90
1022
4.10
984
3.78
1006
3.99
1029
4.20

1.2
Rpm
864
868
878
889
900
910
920
931
942
954
966
978
990
997
1003
1015
1028
1042
1055
1062
1069

1.4
Bhp
1.99
2.04
2.16
2.29
2.41
2.52
2.64
2.76
2.89
3.02
3.15
3.30
3.45
3.54
3.62
3.80
3.99
4.18
4.38
4.49
4.59

Rpm
920
921
928
937
947
958
968
979
989
1000
1011
1022
1034
1040
1045
1057
1070
1082
1095
1102
1108

Bhp
2.39
2.41
2.45
2.57
2.70
2.85
2.99
3.13
3.26
3.40
3.55
3.69
3.84
3.93
4.01
4.18
4.36
4.56
4.76
4.87
4.98

1.6
Rpm
974
976
983
986
993
1002
1012
1023
1034
1044
1054
1065
1076
1082
1087
1098
1110
1122
1134
—
—

Bhp
2.76
2.78
2.88
2.91
3.01
3.15
3.30
3.47
3.63
3.79
3.94
4.10
4.26
4.27
4.43
4.60
4.78
4.97
5.16
—
—

4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 2.9 for standard motors. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. See Evaporator-Fan Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 840 to 1085 rpm for standard motors. All other rpms
require a field-supplied drive.

581B102 (81/2 TONS) — HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750
3800
3900
4000
4100
4200
4250
4300

0.2
Rpm Bhp
550
0.69
557
0.72
573
0.79
588
0.86
604
0.94
620
1.02
636
1.11
652
1.21
668
1.31
684
1.41
701
1.53
717
1.65
733
1.77
742
1.84
750
1.90
767
2.04
783
2.18
800
2.34
817
2.49
826
2.58
834
2.66

0.4
Rpm Bhp
627
0.94
634
0.97
648
1.05
662
1.13
676
1.21
690
1.30
704
1.39
718
1.49
732
1.59
747
1.70
762
1.82
777
1.94
792
2.07
800
2.14
807
2.21
822
2.35
838
2.50
854
2.66
869
2.82
877
2.91
885
3.00

0.6
Rpm Bhp
692
1.17
698
1.21
711
1.29
723
1.38
737
1.48
750
1.58
764
1.69
778
1.80
793
1.92
807
2.04
821
2.16
835
2.29
849
2.42
856
2.49
863
2.56
877
2.71
891
2.86
905
3.02
920
3.19
928
3.28
935
3.37

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
864 1.99
920 2.39
754
1.45
812 1.74
868 2.04
921 2.41
759
1.49
816 1.79
878 2.16
928 2.45
770
1.58
827 1.88
889 2.29
937 2.57
782
1.66
837 1.98
900 2.41
947 2.70
794
1.76
848 2.08
910 2.52
958 2.85
806
1.86
849 2.18
870 2.29
920 2.64
968 2.99
818
1.97
882 2.40
931 2.76
979 3.13
831
2.09
894 2.53
942 2.89
989 3.26
844
2.21
907 2.66
954 3.02 1000 3.40
857
2.35
871
2.48
919 2.80
966 3.15 1011 3.55
885
2.63
932 2.95
978 3.30 1022 3.69
899
2.78
945 3.11
990 3.45 1034 3.84
907
2.86
952 3.20
997 3.54 1040 3.93
914
2.93
958 3.28 1003 3.62 1045 4.01
928
3.09
972 3.45 1015 3.80 1057 4.18
942
3.26
986 3.63 1028 3.99 1070 4.36
956
3.43 1000 3.81 1042 4.18 1082 4.56
970
3.60 1015 4.00 1055 4.38 1095 4.76
977
3.69 1022 4.10 1062 4.49 1102 4.87
984
3.78 1029 4.20 1069 4.59 1108 4.98

1.6
Rpm Bhp
974 2.76
976 2.78
983 2.88
986 2.91
993 3.01
1002 3.15
1012 3.30
1023 3.47
1034 3.63
1044 3.79
1054 3.94
1065 4.10
1076 4.26
1082 4.27
1087 4.43
1098 4.60
1110 4.78
1122 4.97
1134 5.16
1140 5.27
1147 5.38

1.8
Rpm Bhp
1005 3.04
1008 3.06
1015 3.17
1018 3.20
1025 3.31
1034 3.47
1045 3.63
1056 3.82
1067 3.99
1078 4.17
1088 4.33
1099 4.51
1111 4.69
1117 4.70
1122 4.87
1133 5.06
1146 5.26
1158 5.47
1171 5.68
1177 5.80
1184 5.92

2.0
Rpm Bhp
1034 3.31
1037 3.33
1044 3.45
1047 3.49
1055 3.61
1064 3.77
1075 3.95
1087 4.16
1098 4.35
1109 4.54
1119 4.72
1131 4.91
1143 5.10
1149 5.12
1155 5.31
1166 5.51
1179 5.73
1192 5.95
1204 6.18
1211 6.31
1218 6.45

5. Maximum continuous bhp is 4.2 for high-static motors. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. See Evaporator-Fan Motor Data tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
7. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates field-supplied motor and drive required.
3. Motor drive range is 860 to 1080 rpm for high-static motors. All other rpms
require a field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

38

PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
581B120 (10 TONS) — STANDARD AND HIGH-STATIC MOTOR
AIRFLOW
(Cfm)
3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

0.2
Rpm Bhp
478
0.57
500
0.62
519
0.69
537
0.77
561
0.86
592
0.98
632
1.12
677
1.20
691
1.28
705
1.37
720
1.47
734
1.56
749
1.66
764
1.77
779
1.88
793
1.99
808
2.11
822
2.24
837
2.37
852
2.51
867
2.65

0.4
Rpm Bhp
658
0.92
669
0.97
680
1.03
692
1.10
704
1.17
715
1.24
727
1.32
748
1.43
761
1.52
773
1.62
786
1.71
800
1.82
813
1.92
826
2.04
840
2.16
854
2.28
868
2.42
882
2.56
896
2.71
910
2.86
924
3.01

0.6
Rpm Bhp
721
1.08
731
1.16
741
1.23
751
1.30
761
1.37
773
1.45
784
1.54
810
1.65
822
1.75
834
1.86
847
1.97
860
2.09
873
2.21
886
2.33
899
2.46
912
2.59
925
2.73
937
2.86
950
3.00
963
3.15
977
3.30

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
851 1.50
898 1.78
942 2.01
796 1.23
861 1.57
907 1.86
951 2.09
808 1.30
873 1.65
916 1.95
960 2.18
818 1.38
884 1.72
925 2.03
969 2.27
828 1.47
837 1.57
896 1.82
934 2.12
978 2.36
847 1.66
907 1.92
945 2.22
987 2.46
857 1.76
917 2.03
957 2.32
996 2.55
869 1.89
928 2.17
984 2.43 1036 2.68
880 1.98
937 2.28
993 2.55 1046 2.81
891 2.08
947 2.39 1002 2.66 1055 2.94
902 2.19
957 2.50 1011 2.79 1064 3.07
914 2.31
967 2.60 1021 2.91 1072 3.20
926 2.44
978 2.71 1030 3.04 1081 3.34
938 2.57
989 2.83 1040 3.18 1090 3.48
951 2.71 1000 2.96 1050 3.31 1100 3.63
963 2.86 1012 3.09 1061 3.43 1109 3.78
975 3.00 1024 3.25 1071 3.56 1119 3.93
988 3.16 1036 3.42 1082 3.70 1129 4.09
1001 3.32 1048 3.59 1093 3.86 1139 4.24
1014 3.48 1060 3.76 1105 4.02 1150 4.38
1027 3.65 1073 3.94 1117 4.20 1161 4.54

1.6
Rpm Bhp
983 2.17
992 2.24
1000 2.32
1009 2.41
1018 2.51
1027 2.60
1036 2.71
1080 2.90
1092 3.05
1102 3.20
1112 3.34
1121 3.49
1130 3.64
1139 3.79
1148 3.94
1157 4.09
1166 4.26
1175 4.43
1185 4.60
1194 4.77
1204 4.95

1.8
Rpm Bhp
1023 2.46
1031 2.51
1039 2.58
1048 2.66
1057 2.75
1066 2.85
1075 2.96
1114 3.07
1129 3.25
1143 3.42
1155 3.59
1165 3.76
1175 3.92
1185 4.08
1194 4.25
1203 4.42
1212 4.58
1221 4.76
1230 4.93
1239 5.12
—
—

2.0
Rpm Bhp
1063 2.61
1070 2.75
1077 2.88
1086 2.95
1094 3.02
1102 3.12
1111 3.22
1135 3.17
1156 3.39
1174 3.59
1190 3.80
1203 3.99
1215 4.18
1226 4.36
1236 4.54
1246 4.72
1255 4.91
1264 5.09
—
—
—
—
—
—

4. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.
5. Maximum continuous bhp is 3.70 for standard motors and 5.25 for high-static
motors. Extensive motor and electrical testing on these units ensures that the
full range of the motor can be utilized with confidence. Using your fan motors
up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected. See Evaporator-Fan Motor Data
tables on pages 41 and 42 for additional information.
6. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.
indicates high static motor and drive required.
3. Motor drive range is 860 to 1080 rpm for standard motors and 830 to 1130 for
high-static motors. All other rpms require a field-supplied drive.

581B150 (121/2 TONS) — STANDARD MOTOR
AIRFLOW
(Cfm)
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

0.2
Rpm Bhp
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
867 2.65
882 2.79
896 2.95
911 3.11
926 3.27
940 3.44
955 3.62
970 3.80
985 3.99
1000 4.18
1015 4.39
1030 4.59
1046 4.81

0.4
Rpm Bhp
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
868 2.42
882 2.56
896 2.71
910 2.86
924 3.01
938 3.17
952 3.33
967 3.50
981 3.68
995 3.86
1010 4.04
1024 4.23
1039 4.42
1053 4.62
1068 4.83
1083 5.04
—
—

0.6
Rpm Bhp
—
—
—
—
—
—
—
—
860 2.09
873 2.21
886 2.33
899 2.46
912 2.59
925 2.73
937 2.86
950 3.00
963 3.15
977 3.30
990 3.46
1003 3.63
1017 3.80
1030 3.98
1044 4.17
1058 4.38
1072 4.59
1086 4.80
1100 5.02
1114 5.25
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
0.8
1.0
1.2
1.4
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
928 2.17
984 2.43 1036 2.68
869 1.89
937 2.28
993 2.55 1046 2.81
880 1.98
947 2.39 1002 2.66 1055 2.94
891 2.08
902 2.19
957 2.50 1011 2.79 1064 3.07
914 2.31
967 2.60 1021 2.91 1072 3.20
926 2.44
978 2.71 1030 3.04 1081 3.34
938 2.57
989 2.83 1040 3.18 1090 3.48
951 2.71 1000 2.96 1050 3.31 1100 3.63
963 2.86 1012 3.09 1061 3.43 1109 3.78
975 3.00 1024 3.25 1071 3.56 1119 3.93
988 3.16 1036 3.42 1082 3.70 1129 4.09
1001 3.32 1048 3.59 1093 3.86 1139 4.24
1014 3.48 1060 3.76 1105 4.02 1150 4.38
1027 3.65 1073 3.94 1117 4.20 1161 4.54
1040 3.82 1085 4.12 1129 4.40 1172 4.71
1053 4.00 1098 4.30 1141 4.60 1183 4.91
1066 4.18 1111 4.50 1153 4.80 1194 5.08
1079 4.35 1124 4.70 1166 5.01
—
—
1092 4.54 1137 4.91 1178 5.22
—
—
1105 4.73 1150 5.12
—
—
—
—
1118 4.93
—
—
—
—
—
—
1131 5.14
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

1.6
Rpm Bhp
1080 2.90
1092 3.05
1102 3.20
1112 3.34
1121 3.49
1130 3.64
1139 3.79
1148 3.94
1157 4.09
1166 4.26
1175 4.43
1185 4.60
1194 4.77
1204 4.95
1214 5.13
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

1.8
Rpm Bhp
1114 3.07
1129 3.25
1143 3.42
1155 3.59
1165 3.76
1175 3.92
1185 4.08
1194 4.25
1203 4.42
1212 4.58
1221 4.76
1230 4.93
1239 5.12
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2.0
Rpm Bhp
1135 3.17
1156 3.39
1174 3.59
1190 3.80
1203 3.99
1215 4.18
1226 4.36
1236 4.54
1246 4.72
1255 4.91
1264 5.09
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

4. Maximum continuous bhp is 5.25 for the standard motor. Extensive motor and
electrical testing on these units ensures that the full range of the motor can be
utilized with confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. See Evaporator-Fan Motor Data table on pages 41 and 42 for additional information.
5. Use of a field-supplied motor may affect wire sizing. Contact your Bryant
representative to verify.
6. Interpolation is permissible. Do not extrapolate.

LEGEND
Bhp — Brake Horsepower Input to Fan
FIOP — Factory-Installed Option
NOTES:
1. Boldface indicates field-supplied drive required. (See Note 2.)
2. Standard drive range is 900 to 1260 rpm.
3. Values include losses for filters, unit casing, and wet coils. See page 40 for
accessory/FIOP static pressure information.

39

PERFORMANCE DATA (cont)
OUTDOOR SOUND POWER (TOTAL UNIT)
UNIT
581B
036,048
060,072
090-102
120
150
ARI
dB

ARI
RATING
(dB)
76
80
82
84
86

OCTAVE BANDS
63

125

250

500

1000

2000

4000

8000

55.9
59.1
62.2
64.6
63.7

66.0
68.9
69.3
71.1
69.9

64.0
68.7
71.5
73.3
72.5

66.2
71.9
74.7
76.9
78.2

68.4
74.0
76.2
77.6
81.1

64.5
68.9
72.9
73.7
77.3

61.7
65.7
68.7
70.6
73.3

57.3
59.0
61.5
63.7
66.8

LEGEND
— Air Conditioning and Refrigeration Institute
— Sound Levels (decibels)

ECONOMIZER STATIC PRESSURE DROP (in. wg)
581B036-072
UNIT

900
.05
—

Durablade
EconoMi$er

1200
.05
.09

1400
.05
.12

1600
.05
.15

CFM
1800
.05
.19

2000
.05
.24

2200
.05
.29

2400
.05
.35

2600
.05
—

5500
.08
—

6000
.09
—

ECONOMIZER STATIC PRESSURE DROP (in. wg)
581B090-150
ECONOMIZER

2200
.02
—

Durablade
EconoMi$er

2500
.02
—

3000
.030
.125

3500
.040
.180

CFM
4000
.05
.27

4500
.06
.34

5000
.07
.40

EVAPORATOR-FAN MOTOR EFFICIENCY
UNIT SIZE
581B
036,048
060*
072
090,102
120
150

EFFICIENCY %
75
74/84
84
80
85
87

*Single phase/3 phase.
NOTE: Convert bhp to watts using the following formula:
watts =

bhp (746)
motor efficiency

FIOP PERFECT HUMIDITY™ DEHUMIDIFICATION
PACKAGE STATIC PRESSURE DROP (in. wg)
UNIT SIZE
581B

UNIT NOMINAL
TONS

036
048
060
072
090
102
120
150

3
4
5
6
71/2
81/2
10
121/2

LEGEND
FIOP — Factory-Installed Option

40

300
.04
.07
.09
.12
.08
.10
.08
.11

CFM PER TON
400
500
.07
.09
.12
.15
.15
.21
.20
.28
.13
.18
.15
.22
.13
.18
.18
.26

PERFORMANCE DATA (cont)
581B FAN RPM AT MOTOR PULLEY SETTING WITH STANDARD MOTOR
STANDARD MOTOR
Unit
581B
036
048
060
(single-phase)
060 (3-phase)
and 072
090,102
120
150

1/2

Motor Pulley Turns Open
21/2
3
31 / 2
925
890
860
1015
980
945

1055
1150

1
1025
1115

11/2
990
1080

2
960
1045

1460

1425

1385

1350

1315

1275

1240

1585

1540

1490

1445

1400

1350

1085
1080
1260

1060
1060
1220

1035
1035
1185

1010
1015
1155

985
990
1130

960
970
1100

0
1090
1185

4
825
910

41 / 2
795
875

5
760
840

51/2
—
—

6
—
—

1205

1165

1130

1095

1055

1020

1305

1260

1210

1165

1120

—

—

935
950
1075

910
930
1045

890
905
1015

865
885
990

840
860
960

—
—
930

—
—
900

581B FAN RPM AT MOTOR PULLEY SETTING WITH HIGH-STATIC MOTOR
HIGH-STATIC MOTOR
Unit
581B
036
048
060
072
090
102
120

0
1455
1455
1685
1685
1080
1080
1130

1/2

1423
1423
1589
1589
1025
1025
1112

1
1392
1392
1557
1557
1007
1007
1087

11 / 2
1360
1360
1525
1525
988
988
1062

2
1328
1328
1493
1493
970
970
1037

Motor Pulley Turns Open
21 / 2
3
31/2
1297
1265
1233
1297
1265
1233
1460
1428
1396
1460
1428
1396
952
933
915
952
933
915
1212
987
962

4
1202
1202
1364
1364
897
897
937

41/2
1170
1170
1332
1332
878
878
912

5
1138
1138
1300
1300
860
860
887

51/2
1107
1107
—
—
—
—
962

6
1075
1075
—
—
—
—
830

EVAPORATOR-FAN MOTOR DATA — STANDARD MOTOR
UNIT
581B

UNIT
PHASE
Single

MAXIMUM
CONTINUOUS BHP*
1.20

MAXIMUM
OPERATING WATTS*
1000

Three

1.20

1000

Single

1.20

1000

Three

1.20

1000

Single

1.30

1650

Three

2.40

2120

072

Three

2.40

2120

090,102

Three

2.90

2615

120

Three

3.70

3775

150

Three

5.25

4400

036

048

060

UNIT VOLTAGE
208/230
208/230
460
575
208/230
208/230
460
575
208/230
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575

MAXIMUM
AMP DRAW
4.9
4.9
2.2
2.2
4.9
4.9
2.2
2.2
10.1
6.7
3.0
3.0
6.7
3.0
3.0
8.6
3.9
3.9
12.2
5.5
5.5
17.3
8.5
8.5

*Extensive motor and electrical testing on these units ensures that the
full horsepower and watts range of the motors can be utilized with confidence. Using your fan motors up to the ratings shown in this table will
not result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.

LEGEND
Bhp — Brake Horsepower

41

PERFORMANCE DATA (cont)
EVAPORATOR-FAN MOTOR DATA — HIGH-STATIC MOTORS
UNIT
581B

UNIT
PHASE

MAXIMUM
CONTINUOUS BHP*

MAXIMUM
OPERATING WATTS*

036

Three

2.40

2120

046

Three

2.40

2120

060

Three

2.90

2615

072

Three

2.90

2615

090,102

Three

4.20

3775

120

Three

5.25

4400

UNIT VOLTAGE
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575

MAXIMUM
AMP DRAW
6.7
3.0
3.0
6.7
3.0
3.0
8.6
3.9
3.9
8.6
3.9
3.9
12.2
5.5
5.5
17.5
8.5
8.5

*Extensive motor and electrical testing on these units ensures that the full
horsepower and watts range of the motors can be utilized with confidence.
Using your fan motors up to the ratings shown in this table will not result in
nuisance tripping or premature motor failure. Unit warranty will not be
affected.

LEGEND
Bhp — Brake Horsepower

Durablade Economizer Barometric Relief
Damper Characteristics — 581B090-150

Durablade Economizer Barometric Relief
Damper Characteristics — 581B036-072

42

PERFORMANCE DATA (cont)
0.35
STATIC PRESSURE (in. wg)

50

FLOW (CFM)

40
30
20
10

0.25
0.20
0.15
0.10
0.05
0.00
1200
2000
3 TO 6 TON
7 1/2 TO 12 1/2 TON

0
0
0.5
0.75
0.25
3 TO 6 TON
STATIC PRESSURE (in. wg)
7 1/2 TO 12 1/2 TON

0.30

1

2800

3600

4400

FLOW (CFM)

EconoMi$er Return-Air Pressure Drop

EconoMi$er Outdoor-Air Leakage

STATIC PRESSURE (in. wg)

0.25
0.20
0.15
0.10
0.05
0.00
0
500
3 TO 6 TON
7 1/2 TO 12 1/2 TON

1000

1500

2000

FLOW (CFM)

EconoMi$er Barometric Relief
Damper Characteristics

5000
FLOW (cfm)

FLOW (cfm)

2500
2000
2 FANS
OPERATING

1500

1 FAN
OPERATING

1000
500

4000
3000

2 FANS
OPERATING

2000

1 FAN
OPERATING

1000
0
0

0
0

0.1

0.2

0.3

0.4

0.1

0.2

0.3

0.4

0.5

STATIC PRESSURE (in. wg)

0.5

STATIC PRESSURE (in. wg)

EconoMi$er Power Exhaust Performance
(581B036-072)

EconoMi$er Power Exhaust Performance
(581B090-150)

43

PERFORMANCE DATA (cont)
ALTITUDE COMPENSATION*
581B036-072

ELEVATIO
N
(ft)

0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000

72,000 AND 115,000/
60,000 and 90,000
BTUH NOMINAL
INPUT*
Natural
Liquid
Gas
Propane
Orifice
Orifice
Size†
Size†
33/38
43/45
34/39
43/46
35/40
44/47
36/41
44/47
36/41
44/48
37/42
45/48
37/42
45/49
38/43
46/49
39/43
47/50
41/44
48/50
43/45
48/51
44/45
49/51
44/46
49/52
45/47
50/52

ALTITUDE COMPENSATION*
581B090-150

150,000/120,000 BTUH
NOMINAL INPUT
Natural
Gas
Orifice
Size†
30/32
30/33
31/34
32/35
33/35
34/36
35/37
36/37
37/38
38/40
39/41
40/42
41/43
42/43

ELEVATION
(ft)

Liquid
Propane
Orifice
Size†
38/42
39/42
40/43
41/43
42/43
43/44
43/44
44/45
44/46
45/47
45/48
46/49
47/49
47/50

0-2,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000

125,000-224,000 BTUH
NOMINAL INPUT
Natural
Liquid
Gas
Propane
Orifice
Orifice
Size†
Size†
31
41
32
42
32
42
32
42
33
43
34
43
35
44
36
44
37
45
38
46
39
47
40
47
41
48
42
48

*As the height above sea level increases, there is less oxygen per cubic
foot of air. Therefore, heat input rate should be reduced at higher
altitudes.
†Orifices available through your local Bryant distributor.

*As the height above sea level increases, there is less oxygen per cubic foot of air.
Therefore, heat input rate should be reduced at higher altitudes.
†Orifices available through your Bryant distributor.

ALTITUDE DERATING FACTOR*
581B036-150
ELEVATION
0-2000
2001-3000
3001-4000
4001-5000
5001-6000

250,000 BTUH
NOMINAL INPUT
Natural
Liquid
Gas
Propane
Orifice
Orifice
Size†
Size†
30
38
30
39
31
40
32
41
33
42
34
43
35
43
36
44
37
44
38
45
39
45
40
46
41
47
42
47

MAXIMUM HEATING VALUE
(Btu/ft3)
1100
1050
1000
950
900

*Derating of the unit is not required unless the heating value of the
gas exceeds the values listed in the table above, or if the elevation
exceeds 6000 ft. Derating conditions must be 4% per thousand ft
above sea level. For example, at 4000 ft, if the heating value of the
gas exceeds 1000 Btu/ft3, the unit will require a 16% derating. For
elevations above 6000 ft, the same formula applies. For example, at
7000 ft, the unit will require a 28% derating of the maximum heating
value per the National Fuel Gas Code.

44

ELECTRICAL DATA
581B036-072 STANDARD MOTOR (Units Without Electrical Convenience Outlet)
NOMINAL
VOLTAGE
(V-Ph-Hz)

UNIT
581B

036
(3 Tons)

048
(4 Tons)

060
(5 Tons)

072
(6 Tons)

208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
187
414
518
187
187
414
518
187
187
414
518
187
414
518

Max
254
254
508
632
254
254
508
632
254
254
508
632
254
508
632

COMPRESSOR

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
16.0
10.3
5.1
4.2
23.7
13.5
7.4
5.8
28.8
17.3
9.0
7.1
20.5
9.6
7.7

FLA
0.7
0.7
0.4
0.4
0.7
0.7
0.4
0.4
1.5
1.5
0.8
0.8
1.4
0.6
0.6

FLA
4.9
4.9
2.2
2.2
4.9
4.9
2.2
2.2
8.8
5.8
2.6
2.6
5.8
2.6
2.6

FLA
.57
.57
.30
.30
.57
.57
.30
.30
.57
.57
.30
.30
.57
.30
.30

LRA
88.0
77.0
39.0
31.0
129.0
99.0
49.5
40.0
169.0
123.0
62.0
50.0
156.0
70.0
56.0

POWER
SUPPLY
WITH OUTLET
MCA
MOCP†
25.6/25.6
35/35
18.5/18.5
25/25
9.0
15
7.3
15
35.2/35.2
45/45
22.5/22.5
30/30
11.9
15
9.3
15
46.3/46.3
60/60
28.9/28.9
35/35
14.7
20
11.6
15
32.8/32.8
40/40
15.2
20
12.2
15

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
25/25
101/101
18/18
90/ 90
9
46
7
36
34/34
142/142
22/22
112/112
12
56
9
45
45/45
216/216
28/28
168/168
14
84
11
67
32/32
200/200
15
92
13
78

581B036-072 STANDARD MOTOR (Units With Electrical Convenience Outlet)
NOMINAL
VOLTAGE
(V-Ph-Hz)

UNIT
581B

036
(3 Tons)

048
(4 Tons)

060
(5 Tons)

072
(6 Tons)

208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-1-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
187
414
518
187
187
414
518
187
187
414
518
187
414
518

Max
254
254
508
632
254
254
508
632
254
254
508
632
254
508
632

COMPRESSOR

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
16.0
10.3
5.1
4.2
23.7
13.5
7.4
5.8
28.8
17.3
9.0
7.1
20.5
9.6
7.7

FLA
0.7
0.7
0.4
0.4
0.7
0.7
0.4
0.4
1.5
1.5
0.8
0.8
1.4
0.6
0.6

FLA
4.9
4.9
2.2
2.2
4.9
4.9
2.2
2.2
8.8
5.8
2.6
2.6
5.8
2.6
2.6

FLA
.57
.57
.30
.30
.57
.57
.30
.30
.57
.57
.30
.30
.57
.30
.30

LRA
88.0
77.0
39.0
31.0
129.0
99.0
49.5
40.0
169.0
123.0
62.0
50.0
156.0
70.0
56.0

LEGEND
FLA —
HACR —
IFM
—
LRA —
MCA —
MOCP —
NEC —
OFM —
RLA —
UL
—

POWER
SUPPLY
WITH OUTLET
MCA
MOCP†
31.6/31.6
40/40
24.5/24.5
30/30
11.7
15
9.5
15
41.2/41.2
50/50
28.5/28.5
35/35
14.6
20
11.5
15
52.3/52.3
60/60
34.9/34.9
40/40
17.4
20
13.8
20
38.8/38.8
45/45
17.9
20
14.3
20

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
30/30
106/106
24/24
95/95
11
48
9
38
39/39
147/147
27/27
117/117
14
58
11
47
50/50
221/221
34/34
173/173
17
86
13
69
37/37
205/205
17
94
15
79

Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v

Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Laboratories

Average Voltage =

452 + 464 + 455
3

1371
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x 457
=

*Used to determine minimum disconnect per NEC.
†Fuse or HACR circuit breaker.

NOTES:
1. In compliance with NEC requirements for multimotor and combination
load equipment (refer to NEC Articles 430 and 440), the overcurrent
protective device for the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent of
voltage imbalance.
max voltage deviation from average voltage
= 100 x
average voltage

= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

45

ELECTRICAL DATA (cont)
581B036-072 HIGH-STATIC MOTOR (Units Without Electrical Convenience Outlet)
UNIT
581B

036

048

060

072

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
414
518
187
414
518
187
414
518
187
414
518

Max
254
508
632
254
508
632
254
508
632
254
508
632

COMPRESSOR
(each)
RLA
10.3
5.1
4.2
13.5
7.4
5.8
17.3
9.0
7.1
20.5
9.6
7.7

LRA
77.0
39.0
31.0
99.0
49.5
40.0
123.0
62.0
50.0
156.0
70.0
56.0

OFM

IFM

COMBUSTION
FAN MOTOR

FLA
0.7
0.4
0.4
0.7
0.4
0.4
1.5
0.8
0.8
1.4
0.6
0.6

FLA
5.8
2.6
2.6
5.8
2.6
2.6
7.5
3.4
3.4
7.5
3.4
3.4

RLA
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3

POWER
SUPPLY
MCA
19.4/19.4
9.4
7.7
23.4/23.4
12.3
9.7
30.6/30.6
15.5
12.2
30.6/30.6
15.5
12.2

MOCP†
25/25
15
15
30/30
15
15
35/35
20
15
35/35
20
15

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
19/19
120/120
9
60
8
48
23/23
142/142
12
71
9
57
30/30
187/187
15
94
12
76
30/30
187/187
15
94
12
76

581B036-072 HIGH-STATIC MOTOR (Units With Electrical Convenience Outlet)
UNIT
581B

036

048

060

072

FLA —
HACR —
IFM —
LRA —
MCA —
MOCP—
NEC —
OFM —
RLA —
UL
—

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE

COMPRESSOR
(each)

OFM

IFM

COMBUSTION
FAN MOTOR

Min
187
414
518
187
414
518
187
414
518
187
414
518

RLA
10.3
5.1
4.2
13.5
7.4
5.8
17.3
9.0
7.1
20.5
9.6
7.7

FLA
0.7
0.4
0.4
0.7
0.4
0.4
1.5
0.8
0.8
1.4
0.6
0.6

FLA
5.8
2.6
2.6
5.8
2.6
2.6
7.5
3.4
3.4
7.5
3.4
3.4

RLA
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3

Max
254
508
632
254
508
632
254
508
632
254
508
632

LRA
77.0
39.0
31.0
99.0
49.5
40.0
123.0
62.0
50.0
156.0
70.0
56.0

POWER
SUPPLY
MCA
25.4/25.4
12.1
9.8
29.4/29.4
15.0
11.8
36.6/36.6
18.2
14.4
40.5/40.5
18.7
15.0

MOCP†
30/30
15
15
35/35
20
15
40/40
20
20
45/45
25
20

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
25
124/124
12
63
10
50
29
146/146
14
73
11
59
36
192/192
18
96
14
77
39
224/224
18
104
15
89

Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v

LEGEND
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Laboratories

Average Voltage =
=

452 + 464 + 455
3
1371
3

= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x 7
457

*Used to determine minimum disconnect per NEC.
†Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. UL,
Canada units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent
of voltage imbalance.
max voltage deviation from average voltage
= 100 x
average voltage

= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.

46

ELECTRICAL DATA (cont)
581B090-150 STANDARD MOTOR (Units Without Electrical Convenience Outlet)
UNIT
581B

090

102

120

150

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
414
518
187
414
518
187
414
518
187
414
518

Max
254
508
632
254
508
632
254
508
632
254
508
632

COMPRESSOR

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
12.4
6.4
4.8
15.0
8.2
5.8
18.9
9.0
7.1
19.0
9.0
7.4

FLA
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7

FLA
7.5
3.4
3.4
7.5
3.4
3.4
10.6
4.8
4.8
15.0
7.4
7.4

FLA
.57
.30
.30
.57
.30
.30
.57
.30
.30
.57
.30
.30

LRA
88.0
44.0
34.0
99.0
49.5
40.0
125.0
62.5
50.0
156.0
70.0
54.0

POWER
SUPPLY
WITH OUTLET
MCA
MOCP
38.2/38.2
45/45†
19.2
25†
14.6
20†
44.1/44.1
50/50†
23.3
30†
16.9
20†
55.9/55.9
60/60†
26.5
30†
20.9
25†
60.6/60.6
70/70
29.1
35†
23.7
30†

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
40/40
242/242
20
121
16
95
46/46
264/264
24
132
18
107
59/59
341/341
28
171
22
136
64/64
426/426
31
197
25
154

581B090-150 STANDARD MOTOR (Units With Electrical Convenience Outlet)
UNIT
581B

090

102

120

150

FLA —
HACR —
IFM —
LRA —
MCA —
MOCP—
NEC —
OFM —
RLA —
UL
—

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
414
518
187
414
518
187
414
518
187
414
518

Max
254
508
632
254
508
632
254
508
632
254
508
632

COMPRESSOR

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
12.4
6.4
4.8
15.0
8.2
5.8
18.9
9.0
7.1
19.0
9.0
7.4

FLA
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7

FLA
7.5
3.4
3.4
7.5
3.4
3.4
10.6
4.8
4.8
15.0
7.4
7.4

FLA
.57
.30
.30
.57
.30
.30
.57
.30
.30
.57
.30
.30

LRA
88.0
44.0
34.0
99.0
49.5
40.0
125.0
62.5
50.0
156.0
70.0
54.0

POWER
SUPPLY
WITH OUTLET
MCA
MOCP
44.2/44.2
50/50†
21.9
25†
16.8
20†
50.1/50.1
60/60†
26.0
30†
19.1
25†
61.9/61.9
70/70
29.2
35†
23.1
25†
66.6/66.6
80/70
31.8
35†
25.9
30†

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
46/46
247/247
23
124
18
97
52/52
269/269
27
135
20
109
64/64
345/345
30
173
24
139
70/70
430/430
33
199
27
156

Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v

LEGEND
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Laboratories

Average Voltage =
=

452 + 464 + 455
3
1371
3

= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.

*Used to determine minimum disconnect per NEC.
†Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. The
UL, Canadian approved units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent
of voltage imbalance.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage

47

ELECTRICAL DATA (cont)
581B090-120 HIGH-STATIC MOTOR (Units Without Electrical Convenience Outlet)
UNIT
581B

090

102

120

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
414
518
187
414
518
187
414
518

Max
254
508
632
254
508
632
254
508
632

COMPRESSOR
(each)

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
12.4
6.4
4.8
15.0
8.2
5.8
17.3
9.0
7.1

FLA
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7

FLA
10.6
4.8
4.8
10.6
4.8
4.8
15.0
7.4
7.4

RLA
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3

LRA
88.0
44.0
34.0
99.0
49.5
40.0
125.0
62.0
50.0

POWER
SUPPLY
MCA
41.3
20.6
15.8
47.2
24.7
18.0
56.7
29.1
23.0

MOCP
45†
25†
20†
60†
30†
20†
70
35†
25†

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
44
267
22
134
17
95
50
264
26
132
19
107
61
360
29
181
23
136

581B090-120 HIGH-STATIC MOTOR (Units With Electrical Convenience Outlet)
UNIT
581B

090

102

120

FLA —
HACR —
IFM —
LRA —
MCA —
MOCP—
NEC —
OFM —
RLA —
UL
—

NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60

VOLTAGE
RANGE
Min
187
414
518
187
414
518
187
414
518

Max
254
508
632
254
508
632
254
508
632

COMPRESSOR
(each)

OFM

IFM

COMBUSTION
FAN MOTOR

RLA
12.4
6.4
4.8
15.0
8.2
5.8
17.3
9.0
7.1

FLA
1.4
0.7
0.7
1.4
0.7
0.7
1.4
0.7
0.7

FLA
10.6
4.8
4.8
10.6
4.8
4.8
15.0
7.4
7.4

RLA
0.6
0.3
0.3
0.6
0.3
0.3
0.6
0.3
0.3

LRA
88.0
44.0
34.0
99.0
49.5
40.0
125.0
62.0
50.0

POWER
SUPPLY
MCA
47.3
23.3
18.5
53.2
27.4
20.7
62.7
31.8
25.7

MOCP
50†
25†
20†
60†
30†
25†
70
35†
30†

MINIMUM UNIT
DISCONNECT
SIZE*
FLA
LRA
49
267
24
134
19
95
55
264
28
132
21
107
66
360
32
181
25
147

Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v

LEGEND
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Laboratories

Average Voltage =
=

452 + 464 + 455
3
1371
3

= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.

*Used to determine minimum disconnect per NEC.
†Fuse or HACR circuit breaker per NEC.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. The
UL, Canada approved units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
greater than 2%. Use the following formula to determine the percent
of voltage imbalance.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage

48

APPLICATION DATA
The location of the coil in the indoor airstream enhances
the latent capacity of the 581B rooftop units by up to 40%.
Many buildings suffer damage or have poor indoor-air quality due to overly humid conditions. Building humidity must
be controlled for the following reasons:
a. INDOOR-AIR QUALITY — Humidity is a major factor in
the growth and propagation of mold and mildew in a
building. The mold and mildew can spread quickly and
grow in carpets and ductwork and on walls, and often
causes cases of sick building syndrome. This syndrome
can lead to employee absenteeism due to illness, lower
worker productivity, and increased health care costs.
The American Society of Heating, Refrigeration, and
Air Conditioning Engineers (ASHRAE) recommends
that relative humidity levels in buildings be maintained
below 70%.
b. COMFORT LEVELS — High humidity levels cause the
occupied space to become uncomfortable, because
humidity interferes with the body’s natural cooling process (evaporation at the skin surface).
c. HUMIDITY DAMAGE — Humidity causes property
damage, such as stained wallpaper and ceiling tiles.
Humidity can also damage books and artwork, and
create strong odors in carpets. In addition, humidity can
contribute to unacceptable product quality in industrial
processes.
d. IMPROPER VENTILATION — Buildings in hot and
humid geographical areas cannot be properly ventilated
due to high humidity levels outdoors, resulting in poor
indoor-air quality.
e. EQUIPMENT INEFFICIENCY — Humidity can cause
inefficient operation of refrigerators and freezers.
f. INCREASED ENERGY COSTS — Because of high
humidity levels and less comfortable conditions, thermostat set points are lowered to force the HVAC (heating, ventilation, and air conditioning) equipment to run
longer and work harder to lower the humidity levels.
Also, in an attempt to control humidity, system designers typically oversize HVAC equipment and add reheat
capability to get the desired latent capacity. This results
in higher initial equipment costs, as well as increased
energy expenses throughout the life of the unit.
Applications
There are many different rooftop unit applications that are
susceptible to problems caused by high humidity levels.
Some common applications include:
a. RESTAURANTS — The kitchen areas of restaurants
have many humidity-producing activities, such as dish
washing and cooking.
b. SUPERMARKETS — High humidity levels cause inefficiency in operation of refrigeration and freezer systems.
c. MUSEUMS AND LIBRARIES — Humidity can damage
books and artwork.
d. GYMNASIUMS, LOCKER ROOMS, AND HEALTH
CLUBS — Shower areas and human perspiration
cause uncomfortable occupied space conditions.
e. HOT AND HUMID CLIMATES — The southeastern
United States is a good example of this application. The
Perfect Humidity dehumidification package becomes
particularly useful when increased amounts of the hot
and humid outdoor air need to be brought into the building for proper ventilation.
16. PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE
DESIGN EFFECTS — To fully understand the operation of
the Perfect Humidity dehumidification package, refer to the
pressure enthalpy curve, and analyze the Perfect Humidity
package effects on the refrigerant in the rooftop unit. The
pressure enthalpy curve shows the refrigerant cycle for a
581B rooftop unit.

1. CONDENSATE DRAIN PAN — A sloped condensate drain
pan is supplied on all units. The condensate pan must be
externally trapped. Condensate drains are located on both
the bottom and end of the unit.
2. DUCTWORK — All ductwork must be attached to flanges.
If no flanges are present, they must be field supplied.
Secure vertical discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to flanges.
Field-supplied flanges can be attached to horizontal discharge openings and all ductwork attached to flanges.
3. TO CONVERT FROM VERTICAL DISCHARGE TO HORIZONTAL DISCHARGE (Durablade Economizer Only):
a. Remove economizer/two-position damper to gain access
to return duct opening.
b. Move the horizontal-discharge duct opening covers to
the vertical discharge openings.
c. Rotate economizer 90 degrees (until the economizer/
two-position damper motor faces the condenser section).
d. Rotate the barometric relief damper 90 degrees.
e. Install block-off plate over the opening on the access
panel.
4. THERMOSTAT — Use of 2-stage cooling thermostat is
recommended for all size 036-072 units equipped with
economizer.
5. HEATING-TO-COOLING CHANGEOVER — All units are
automatic changeover from heating to cooling when automatic changeover thermostat and subbase are used.
6. AIRFLOW — Units are draw-thru on cooling and blow-thru
on heating.
7. MAXIMUM AIRFLOW — To minimize possibility of condensate blow-off from evaporator, airflow through units should
not exceed 500 cfm/ton.
8. MINIMUM AIRFLOW — Minimum airflow for cooling is
300 cfm/ton.
9. MINIMUM AMBIENT OPERATING TEMPERATURE —
Minimum ambient operating temperature for size 036-150
standard units is 25 F. With accessory Motormaster® or
Motormaster II control, units can operate at outdoor temperatures down to –20 F.
10. MAXIMUM OPERATING OUTDOOR-AIR TEMPERATURE
— Maximum outdoor-air operating temperature for cooling
is 125 F.
11. HIGH ALTITUDES — These may require a change to the
gas orifice. Refer to Altitude Compensation tables on
page 43.
12. MINIMUM TEMPERATURE — Minimum temperature of air
entering the dimpled heat exchanger is 50 F continuous
and 45 F intermittent.
13. MOTOR DATA — Due to Bryant’s internal unit design
(draw-thru over the motor), air path, and specially designed
motors, the full horsepower (maximum continuous bhp)
listed in the Physical Data table and the notes following
each Fan Performance table can be utilized with extreme
confidence.
Using Bryant motors to the values listed in the Physical
Data, Fan Performance, and Evaporator-Fan Motor Data
tables will not result in nuisance tripping or premature
motor failure. In addition, the unit warranty will not be
affected.
14. THRU-THE-BOTTOM CONNECTIONS — The accessory
thru-the-bottom connections are needed to ensure proper
connections when routing wiring and piping through the
basepan and roof curb. This accessory is used for electric
and control power only.
15. PERFECT HUMIDITY™ DEHUMIDIFICATION PACKAGE
— This option provides greater dehumidification by further
subcooling the hot liquid refrigerant leaving the condenser
coil. The Perfect Humidity package consists of a subcooling
coil located on the leaving-air side of the evaporator coil.

49

APPLICATION DATA (cont)
Standard Unit Refrigerant Cycle
At point no. 1 in the pressure enthalpy curve, vapor leaving the
compressor at a high pressure and a high temperature enters
the condenser. The condenser removes heat from the refrigerant, lowers its temperature, and changes it to a liquid. At point
no. 2, the liquid leaves the condenser and enters a fixed expansion device that lowers the pressure of the refrigerant. At point
no. 3, the liquid enters the evaporator coil, where the refrigerant
increases in temperature and changes back to a vapor. At point
no. 4, the vapor leaves the evaporator and reenters the compressor.
Refrigerant Cycle Using Perfect Humidity™ Dehumidification
Package
When a subcooler coil is added to the rooftop unit, the refrigerant is affected in such a way that the unit latent capacity is
increased. The refrigerant cycle follows the same path from
point no. 1 to point no. 2 as the standard refrigerant cycle without a subcooler (see the pressure enthalpy curve). However, at
point no. 2, the liquid refrigerant enters the subcooler coil where
the temperature is lowered further. At point no. 2A, this subcooled liquid enters the TXV, which drops the pressure of the
liquid. At point no. 2B, the liquid enters the fixed orifice metering
device. The refrigerant leaves this device as a saturated vapor
and enters the evaporator at point no. 2C. The improved refrigeration effect can now be seen between point no. 2C and point
no. 3. The increase in the total refrigeration effect is the additional enthalpy gained from point no. 2C to point no. 3. However,
the subcooler coil rejects this added refrigeration effect to the
air downstream of the evaporator coil, thus maximizing the overall latent effect. This improved latent effect is a direct result of
the addition of the Perfect Humidity subcooler coil to the refrigerant cycle.
Latent Capacity Effects
Refer to the psychrometric chart to see how the sensible heat
factor decreases when the optional Perfect Humidity dehumidification package is installed. This chart contains data for the
5-ton 581B unit operation, both with and without the Perfect
Humidity package, at 1750 cfm. Point no. 1 on the chart represents the return-air dry bulb (80 F) and wet bulb (67 F) conditions. Point no. 2 represents the supply-air conditions for a
standard 581B rooftop unit without the Perfect Humidity dehumidification package. Point no. 3 represents the supply-air conditions for a 581B rooftop unit with the Perfect Humidity
package. By connecting point no. 1 and point no. 2 on the chart
and finding the intersection on the sensible heat factor scale,
the sensible heat factor is 0.73. Connect point no. 1 and point
no. 3, and see that the sensible heat factor is 0.58. This is a
17.5% increase in latent capacity for the given conditions. This
increase in latent capacity allows the 581B rooftop units to
remove more moisture from the conditioned space; thus lowering the humidity levels.
Dehumidification Effects
Further evidence of dehumidification can be seen by analyzing
the pounds of water per pound of dry air found in the supply air.
At point no. 2 in the psychrometric chart, there are 65 grains
(0.0092 lb) of moisture per pound of dry air. At point no. 3, there
are 58 grains (0.0083 lb) of moisture per pound of dry air. This
is a 12.1% decrease in the amount of water in the supply air.
17. PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE
OPERATING PERFORMANCE — Perfect Humidity dehumidification package operation does not affect the electrical
data. The electrical data remains the same either with or
without the Perfect Humidity package.
The operating and shipping weights will be slightly
increased with the addition of the Perfect Humidity subcooler. See the Physical Data table for added base unit
weight with this option.
Refer to cooling performance data, both with and without
the Perfect Humidity dehumidification package. Note the

greatly improved latent capacity with the Perfect Humidity
dehumidification package.
Static pressure is also slightly affected by the addition of
the Perfect Humidity dehumidification package. See Static
Pressure Drop table on page 40 when using this option.
18. PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE
FEATURES AND BENEFITS
• The Perfect Humidity dehumidification package can improve
the humidity control of your rooftop equipment by up to 40%.
This greatly reduces the risk of sick building syndrome by
reducing biological growth in both ductwork and the rest of the
building.
• The Perfect Humidity dehumidification package improves
comfort levels in the building by better controlling the humidity.
This improved comfort level allows building tenants to raise
the cooling set point on the thermostats for accumulated
energy savings.
• Better humidity control lowers the risk of humidity-induced
property damage.
• The Perfect Humidity dehumidification package permits building refrigerators and freezers to operate more efficiently due
to lower relative humidity levels. This is the perfect solution for
supermarket applications.
• The Perfect Humidity subcooling circuit can be operated by a
humidity sensor. If the sensor is used, the Perfect Humidity
circuit will then only operate when needed. If the humidity levels in the occupied space are acceptable (such as in the
spring and fall seasons), the Perfect Humidity circuit will not
operate. The rooftop unit is then able to operate to its full sensible potential, which provides more efficient performance and
energy savings.
• At lower outdoor temperatures, rooftop units with dehumidification devices are subject to low suction pressure conditions.
The Perfect Humidity dehumidification package contains a
low-pressure switch that deactivates the Perfect Humidity
dehumidification package under low suction pressure conditions without deactivating the compressors.
• Improved humidity control allows increased outdoor-air ventilation in hot and humid geographical areas. Humidity control
also helps to improve the indoor-air quality of the building.
• The Perfect Humidity dehumidification package is factory
installed. There are no additional field installation costs. There
is also no need to purchase a roof curb from another manufacturer, as standard Bryant roof curbs will accommodate the
581B rooftop units which have the Perfect Humidity dehumidification package option installed.
• The Perfect Humidity dehumidification package is engineered
and manufactured by Bryant for Bryant rooftop units. All application support, service, and warranty issues can therefore be
handled through one company.
• The slightly lower sensible capacities obtained when using the
Perfect Humidity dehumidification package allow the unit to
operate for an extended period of time. The more the unit
operates, the more air is exposed to the subcooling coil. This
rooftop unit increased latent capacity results in lower relative
humidity levels in the occupied space.
• It is no longer necessary to oversize equipment and add
reheat devices to properly dehumidify your building. In a typical scenario, a building owner may need 39,000 Btuh of sensible capacity and 23,000 Btuh of latent capacity (62,000 total
Btuh). To accomplish this without the Perfect Humidity dehumidification package, a 71/2-ton unit with a reheat device
would be necessary to attain the higher latent capacity
required. This results in a large up-front expense to oversize
the equipment from a standard 5-ton to a 71/2-ton unit.
The building owner can now purchase a 5-ton unit with the
Perfect Humidity dehumidification package for a small additional up-front charge, and no reheat device will be necessary
to satisfy the cooling requirements. This reduces both installation costs and operating costs throughout the life of the
product.

50

APPLICATION DATA (cont)

Perfect Humidity™ Dehumidification Option

51

52
Pressure Enthalpy Curve

NOTE: Numbers 1 through 4 indicate point numbers referred to in Perfect Humidity™ Dehumidification Package Design Effects section.

APPLICATION DATA (cont)

LEGEND
db — Dry Bulb
wb — Wet Bulb

Point 1 — Entering Air (F) 80 db/67 wb
Point 2 — Leaving Air (F) 58.9 db/56.4 wb
(Without Subcooler)
Point 3 — Leaving Air (F) 63.0 db/56.8 wb
(With Subcooler)

Psychrometric Chart (581B072 Shown)

APPLICATION DATA (cont)

53

TYPICAL PIPING AND WIRING

Vertical Discharge

LEGEND
NEC — National Electrical Code

Horizontal Discharge

54

TYPICAL WIRING SCHEMATIC

581B036-072 Typical Wiring Schematic and Component Arrangement
(208/230 V 3-Phase Unit Shown)

55

TYPICAL WIRING SCHEMATIC (cont)

581B036-072 Typical Wiring Schematic and Component Arrangement
(208/230 V 3-Phase Unit Shown) (cont)
LEGEND
AHA
C
CAP
CC
CLO
COMP
D
EC
ECON
EPS
EQUIP
ER
FPT
FSS
FU
GND
GVR
HPS
HS
HV
I
IDM
IFC

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Adjustable Heat Anticipator
Contactor, Compressor
Capacitor
Cooling Compensator
Compressor Lockout
Compressor Motor
Diode
Enthalpy Control
Economizer
Emergency Power Supply
Equipment
Economizer Relay
Freeze-Protection Thermostat
Filter-Status Switch
Fuse
Ground
Gas Valve Relay
High-Pressure Switch
Hall-Effect Sensor
High Voltage
Ignitor
Induced-Draft Motor
Indoor (Evaporator) Fan Contactor

IFM
IGC
LED
LPS
LS
MGV
MTR
OAT
OFM
OLR
P
PL
QT
R
RS
SAT
SEN
SW1
SW2
SW3
SW4
TC

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Indoor (Evaporator) Fan Motor
Integrated Gas Unit Controller
Light-Emitting Diode
Low-Pressure/Loss-of-Charge Switch
Limit Switch
Main Gas Valve
Motor
Outdoor-Air Thermostat
Outdoor (Condenser) Fan Motor
Overload
Plug
Plug Assembly
Quadruple Terminal
Relay
Rollout Switch
Supply-Air Thermostat
Sensor
Switch Fully Open
Switch Fully Closed
Switch Minimum Vent Position
Switch Maximum Vent Position
Thermostat-Cooling

TH
— Thermostat-Heating
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential only.
Not to represent wiring.

NOTES:
1. If any of the original wire furnished must be replaced, it must be replaced with Type 90 C wire or its equivalent.
2. Three-phase motors are protected under primary single-phasing conditions.
3. Thermostats: HH07AT170, 172
Subbase: HH93AZ176, 177, 178 and 179
4. Set heat anticipator at .14 amp for first stage and .14 amp for second stage.
5. Use copper conductors only.
6. TRAN is wired for 230 v unit. If unit is to be run with 208 v power supply, disconnect BLK wire from 230 v tap and
connect to 208 v tap (RED). Insulate end of 230 v tap.

56

TYPICAL WIRING SCHEMATIC (cont)
LEGEND
AHA
BR
C
CAP
CB
CC
CLO
COMP
CONN
CR
D
EC
ECON
EPS
EQUIP
ER
FPT
FS
FSS
FU
GND
GVR
HPS
HS
HV
I
IDM
IFC

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

IFM
—
IFMOVL —
IGC
LPS

—
—

LS
MGV
MTR
NC
NO
OAT
OFC

—
—
—
—
—
—
—

OFM
P
PL
QT
R
RS
SAT
SEN
SW1
SW2
SW3
SW4
TC
TH
TRAN

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Adjustable Heat Anticipator
Burner Relay
Contactor, Compressor
Capacitor
Circuit Breaker
Cooling Compensator
Compressor Lockout
Compressor Motor
Connection
Control Relay
Diode
Enthalpy Control
Economizer
Emergency Power Supply
Equipment
Economizer Relay
Freeze-Protection Thermostat
Flame Sensor
Filter Status Switch
Fuse
Ground
Gas Valve Relay
High-Pressure Switch
Hall Effect Sensor
High Voltage
Ignitor
Induced-Draft Motor
Indoor (Evaporator) Fan
Contactor
Indoor (Evaporator) Fan Motor
Indoor-Fan Motor Overload
Switch
Integrated Gas Unit Controller
Low-Pressure/Loss-of-Charge
Switch
Limit Switch
Main Gas Valve
Motor
Normally Closed
Normally Open
Outdoor-Air Thermostat
Outdoor (Condenser) Fan
Contactor
Outdoor (Condenser) Fan Motor
Plug
Plug Assembly
Quadruple Terminal
Relay
Rollout Switch
Supply-Air Thermostat
Sensor
Switch Fully Open
Switch Fully Closed
Switch Minimum Vent Position
Switch Maximum Vent Position
Thermostat-Cooling
Thermostat-Heating
Transformer
Field Splice
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential
only. Not to represent wiring.

581B090-150 Typical Wiring Schematic

57

CIRCUIT
BREAKER

VOLTS

CB

24 V

CB1
(150 Std)

208/230-3-60

MFG. PT. NO.
Potter & Brumfield
W2BX-1024-3.2
Heinemann

Airpax

CF3-2204-15

209-3-2599-485

MUST
TRIP
AMPS
3.2

17.3

CONTROLS
greater than 57 F, the EconoMi$er modulates open, allowing a
greater amount of outdoor air to enter the unit. If the SAT drops
below 53 F, the outdoor-air damper modules closed to reduce
the amount of outdoor air. When the SAT is between 53 and
57 F, the EconoMi$er maintains its position.
Heating, Units Without Economizer — When the thermostat
calls for heating, terminal W1 is energized. The induced-draft
motor is energized and the burner ignition sequence begins.
The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a flame is ignited. On units equipped for two stages
of heat, when additional heat is needed, W2 is energized and
the high-fire solenoid on the main gas valve (MGV) is energized. When the thermostat is satisfied and W1 is deenergized,
the IFM stops after a 45-second time-off delay.
Heating, Units With Economizer or Two-Position Damper —
When the thermostat calls for heating, terminal W1 is energized. The induced-draft motor is energized and the burner ignition sequence begins. The indoor (evaporator) fan motor (IFM)
is energized 45 seconds after a flame is ignited and the damper
moves to the minimum position. If the accessory two-position
damper is used, the outdoor-air damper opens to the minimum
position whenever the evaporator fan runs. On units equipped
for two stages of heat, when additional heat is needed, W2 is
energized and the high-fire solenoid on the main gas valve
(MGV) is energized. When the thermostat is satisfied and W1 is
deenergized, the IFM stops after a 45-second time-off delay.
The economizer damper then moves to the fully closed position.
When using continuous fan, the damper will remain in the minimum position.
OPERATING SEQUENCE FOR 581B090-150 UNITS
Cooling, Units Without Economizer — When thermostat calls
for cooling, terminals G and Y1 are energized. The indoor
(evaporator) fan contactor (IFC) and compressor contactor no. 1
(C1) are energized, and evaporator-fan motor, compressor
no. 1, and condenser fans start. The condenser-fan motors run
continuously while unit is cooling. For units with 2 stages of
cooling, if the thermostat calls for a second stage of cooling by
energizing Y2, compressor contactor no. 2 (C2) is energized
and compressor no. 2 starts.
When the thermostat is satisfied, C1 and C2 are deenergized
and the compressors and outdoor (condenser) fan motors
(OFM) shut off. After a 30-second delay, the indoor (evaporator)
fan motor (IFM) shuts off. If the thermostat fan selector switch is
in the ON position, the evaporator motors will run continuously.
Cooling, Units With Durablade Economizer — When the
outdoor-air temperature (OAT) is above the OAT setting and the
room thermostat calls for cooling, the compressor contactor
no. 1 is energized to start compressor no. 1 and outdoor (condenser) fan motors (OFM). The indoor (evaporator) fan motor
(IFM) is energized and the economizer damper moves to the
minimum position. Upon a further call for cooling, compressor
contactor no. 2 will be energized, starting compressor no. 2.
After the thermostat is satisfied and the IFM is deenergized, the
damper moves to the fully closed position.
When the outdoor-air temperature is below the OAT setting and
the thermostat calls for Y1 and G, the economizer damper
moves to the minimum position when the evaporator fan starts.
The first stage of cooling is provided by the economizer. If the
supply-air temperature is above 57 F, a switch on the supply-air
thermostat is closed between the T2 terminal and the 24 vac
terminal. This causes the damper to continue to modulate open
until the supply-air temperature falls below 55 F or the damper
reaches the fully open position.
When the supply-air temperature is between 55 F and 52 F, the
supply-air thermostat has open switches between the T2 and
24 vac terminals and between the T1 and 24 vac terminals. This
causes the economizer damper to remain in an intermediate
open position.

OPERATING SEQUENCE FOR 581B036-072 UNITS
Cooling, Units Without Economizer — When thermostat calls
for cooling, terminals G and Y1 and the compressor contactor
(C) are energized. The indoor (evaporator) fan motor (IFM),
compressor, and outdoor (condenser) fan motor (OFM) start.
The OFM runs continuously while the unit is in cooling. When
the thermostat is satisfied, C is deenergized and the compressor and OFM shut off. After a 30-second delay, the IFM shuts
off. If the thermostat fan selector switch is in the ON position,
the evaporator motor will run continuously.
Cooling, Units With Durablade Economizer — When the
outdoor-air temperature is above the outdoor-air temperature
(OAT) setting and the room thermostat calls for cooling, the
compressor contactor is energized to start the compressor and
outdoor (condenser) fan motor (OFM). The indoor (evaporator)
fan motor (IFM) is energized and the economizer damper
moves to the minimum position. After the thermostat is satisfied, the damper moves to the fully closed position when IFM is
deenergized.
When the outdoor-air temperature is below the OAT setting and
the thermostat calls for Y1 and G, the economizer damper
moves to the minimum position when the evaporator fan starts.
The first stage of cooling is provided by the economizer. If the
supply-air temperature is above 57 F, a switch on the supply-air
thermostat is closed between the T2 terminal and the 24 vac
terminal. This causes the damper to continue to modulate open
until the supply-air temperature falls below 55 F or the damper
reaches the fully open position.
When the supply-air temperature is between 55 F and 52 F, the
supply-air thermostat has open switches between the T2 and
24 vac terminals and between the T1 and 24 vac terminals. This
causes the economizer damper to remain in an intermediate
open position.
If the supply-air temperature falls below 52 F, a switch on the
supply-air thermostat is closed between the T1 terminal and the
24 vac terminal. This causes the damper to modulate closed
until the supply-air temperature rises above 55 F or the damper
reaches the minimum position.
When the supply-air temperature is between 55 F and 57 F, the
supply-air thermostat has open switches between the T2 and
24 vac terminals. This causes the economizer damper to
remain in an intermediate open position.
If the outdoor air alone cannot satisfy the cooling requirements
of the conditioned space, economizer cooling is integrated with
mechanical cooling, providing second stage cooling. The compressor and condenser fan will be energized and the position of
the economizer damper will be determined by the supply-air
temperature.
When the second stage of cooling is satisfied, the compressor
and condenser-fan motor will be deenergized. The damper
position will be determined by the supply-air temperature.
When the first stage of cooling is satisfied, the IFM shuts off
after a 30-second delay. The damper then moves to fully closed
position.
Cooling, Units With EconoMi$er — When the outdoor-air
temperature (OAT) is above the ECON SP set point and the
room thermostat calls for Stage 1 cooling (R to G +Y1), the
indoor-fan motor (IFM) is energized and the EconoMi$er
damper modulates to minimum position. The compressor contactor is energized starting the compressor and outdoor-fan
motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.
When the OAT is below the ECON SP set point and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the
EconoMi$er modulates to the minimum position when the IFM
is energized. The EconoMi$er provides Stage 1 of cooling by
modulating the return and outdoor air dampers to maintain a
55 F supply air set point. If the supply-air temperature (SAT) is

58

CONTROLS (cont)
If the supply-air temperature falls below 52 F, a switch on the
supply-air thermostat is closed between the T1 terminal and the
24 vac terminal. This causes the damper to modulate closed
until the supply-air temperature rises above 55 F or the damper
reaches the minimum position.
When the supply-air temperature is between 55 F and 57 F, the
supply-air thermostat has open switches between the T2 and
24 vac terminals. This causes the economizer damper to
remain in an intermediate open position.
If the outdoor air alone cannot satisfy the cooling requirements
of the conditioned space, economizer cooling is integrated with
mechanical cooling, providing second stage cooling. Compressor no. 1 and condenser fan will be energized, and the position
of the economizer damper will be determined by the supply-air
temperature. Compressor no. 2 is locked out.
When the second stage of cooling is satisfied, the compressor
and condenser fan motors will be deenergized. The damper
position will be determined by the supply-air temperature.
When the first stage of cooling is satisfied, the IFM shuts off
after a 30-second delay. The damper then moves to fully closed
position.
Cooling, Units With EconoMi$er — When the outdoor-air
temperature (OAT) is above the ECON SP set point and the
room thermostat calls for Stage 1 cooling (R to G +Y1), the
indoor-fan motor (IFM) is energized and the EconoMi$er
damper modulates to minimum position. The compressor contactor is energized starting the compressor and outdoor-fan
motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.
When the OAT is below the ECON SP set point and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the
EconoMi$er modulates to the minimum position when the IFM
is energized. The EconoMi$er provides Stage 1 of cooling by
modulating the return and outdoor air dampers to maintain a
55 F supply air set point. If the supply-air temperature (SAT) is
greater than 57 F, the EconoMi$er modulates open, allowing a
greater amount of outdoor air to enter the unit. If the SAT drops
below 53 F, the outdoor-air damper modules closed to reduce
the amount of outdoor air. When the SAT is between 53 and
57 F, the EconoMi$er maintains its position.
Heating, Units Without Economizer — When the thermostat
calls for heating, terminal W1 is energized. In order to prevent
thermostat short-cycling, the unit is locked into the Heating
mode for at least 1 minute when W1 is energized. The induceddraft motor (IDM) is then energized and the burner ignition
sequence begins. The indoor (evaporator) fan motor (IFM) is
energized 45 seconds after a flame is ignited. When additional
heat is needed, W2 is energized and the high-fire solenoid on
the main gas valve (MGV) is energized. When the thermostat is
satisfied and W1 and W2 are deenergized, the IFM stops after a
45-second time-off delay.
Heating, Units With Economizer or Two-Position Damper —
When the thermostat calls for heating, terminal W1 is energized. In order to prevent thermostat short-cycling, the unit is
locked into the Heating mode for at least 1 minute when W1 is
energized. The induced-draft motor is then energized and the
burner ignition sequence begins. The indoor (evaporator) fan
motor (IFM) is energized 45 seconds after a flame is ignited and
the damper moves to the minimum position. If the accessory
two-position damper is used, the outdoor-air damper opens to
the minimum position whenever the evaporator fan runs. When
additional heat is needed, W2 is energized and the high-fire
solenoid on the main gas valve (MGV) is energized. When the

thermostat is satisfied and W1 and W2 are deenergized, the
IFM stops after a 45-second time-off delay. The economizer
damper then moves to the fully closed position. When using
continuous fan, the damper will remain in the minimum position.
OPERATING SEQUENCE FOR 581B036-150 SIZE UNITS
Units With Perfect Humidity™ Dehumidification Package —
When thermostat calls for cooling, terminals G and Y1 is energized. The indoor (evaporator) fan motor (IFM), compressor (C),
and outdoor (condenser) fan motor (OFM) start. The OFM runs
continuously while the unit is in cooling. As shipped from the
factory, Perfect Humidity dehumidification circuit is always energized. If Perfect Humidity circuit modulation is desired, a fieldinstalled, wall-mounted LC Thermidistat or humidistat are
required.
If the Perfect Humidity humidistat is installed and calls for the
Perfect Humidity subcooler coil to operate, the humidistat internal switch closes. This energizes and closes the liquid line solenoid valve coil (LLSV) of the Perfect Humidity circuit, forcing the
hot liquid refrigerant of the liquid line to enter the subcooler coil.
As the hot liquid passes through the subcooler coil, it is
exposed to the cold supply airflow coming off from the evaporator coil and the liquid is further cooled to a temperature
approaching the evaporator coil leaving-air temperature. The
state of the refrigerant leaving the subcooler coil is a highly subcooled liquid refrigerant. The liquid then enters a thermostatic
expansion valve (TXV) where the liquid is dropped to a lower
pressure. The TXV does not have a pressure drop great
enough to change the liquid to a 2-phase fluid. The TXV can
throttle the pressure drop of the liquid refrigerant and maintain
proper conditions at the compressor suction valve over a wide
range of operating conditions. The liquid then enters a second
fixed restrictor expansion device for a second pressure drop to
a 2-phase fluid. The liquid proceeds to the evaporator coil at a
temperature lower than normal cooling operation. This lower
temperature is what increases the latent capacity of the rooftop.
The 2-phase refrigerant passes through the evaporator and is
changed into a vapor. The air passing over the evaporator coil
will become colder than during normal operation as a result of
the colder refrigerant temperatures. However, as it passes over
the subcooler coil, the air will be warmed slightly.
As the refrigerant leaves the evaporator, the refrigerant passes
a low-pressure switch in the suction line. This low-pressure
switch will deactivate the Perfect Humidity package when the
suction pressure reaches 60 psig. The low-pressure switch is
an added safety device to protect against evaporator coil
freeze-up. The low-pressure switch will only deactivate and
open the liquid line solenoid valve in the Perfect Humidity circuit.
The compressors will continue to run as long as there is a call
for cooling, regardless of the position of the low-pressure
switch. The solenoid valve and the Perfect Humidity package
will be re-activated only when the call for cooling has been satisfied, the low-pressure switch has closed, and a new call for
cooling exists. The crankcase heaters on the scroll compressor
provide additional protection for the compressor due to the
additional refrigerant charge in the subcooler.
When the humidistat is satisfied, the humidistat internal switch
opens cutting power to and opening the LLSV. The refrigerant is
routed back through the evaporator and the subcooler coil is
removed from the refrigerant loop.
When the thermostat is satisfied, C1 is deenergized and the
compressor and OFM shut off. After a 30-second delay, the IFM
shuts off. If the thermostat fan selector switch is in the ON position, the IFM will run continuously.

59

GUIDE SPECIFICATIONS
C. Fans:
1. Indoor blower (evaporator fan) shall be of the
belt-driven, double inlet, forward-curved centrifugal
type. Belt drive shall include an adjustable-pitch
motor pulley.
2. Indoor blower (evaporator fan) shall be made from
steel with a corrosion-resistant finish and shall be
dynamically balanced.
3. Bearings shall be of the sealed, permanently lubricated, ball-bearing type for longer life and lower
maintenance.
4. Condenser fan shall be of the direct-driven propeller
type and shall discharge air vertically upward.
5. Condenser fan shall have aluminum blades riveted to
corrosion-resistant steel spiders and shall be dynamically balanced.
6. Condenser-fan motor shall be totally enclosed.
7. Induced draft blower shall be of the direct-driven, single inlet, forward curved, centrifugal type, shall be
made from steel with a corrosion-resistant finish, and
shall be dynamically balanced.
D. Compressor(s):
1. Fully hermetic scroll type, internally protected.
2. Factory rubber-shock mounted and internally spring
mounted for vibration isolation.
3. On independent circuits (sizes 090-150).
E. Coils:
1. Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to enhanced copper
tubes with all joints brazed.
2. Tube sheet openings shall be belled to prevent tube
wear.
3. Evaporator coil shall be of the face-split design.
F. Heating Section:
1. Induced draft combustion type with energy saving
direct spark ignition system, redundant main gas
valve.
2. The heat exchanger shall be of the tubular section
type constructed of a minimum of 20 gage steel
coated with a nominal 1.2 mil aluminum-silicone alloy
for corrosion resistance.
3. Burners shall be of the in-shot type constructed of
aluminum coated steel.
4. All gas piping shall enter the unit cabinet at a single
location.
5. The Integrated Gas Control (IGC) board shall provide
timed control of evaporator fan functioning and
burner ignition. An LED (light-emitting diode) shall
provide diagnostic information. The LED shall be visible without removing the control box access panel.
6. IGC board contains anti-cycle protection for gas heat
operation (after 4 continuous cycles on high temperature limit switch and one cycle on the flame rollout
switch).
G. Refrigerant Components:
Refrigerant circuit components shall include:
1. Fixed-orifice type feed system.
2. Refrigerant strainer.
3. Service gage connections on suction, discharge, and
liquid lines.
4. Filter drier.
5. Ability to route gage hoses through unit top cover
(unit sizes 036-072 only).
H. Filter Section:
1. Standard filter section shall consist of factoryinstalled low-velocity, throwaway 2-in. thick fiberglass
filters of commercially available sizes.
2. Filter face velocity shall not exceed 300 fpm at nominal airflows.
3. Filter section shall use only one size filter.
4. Filters shall be accessible through an access panel
with ‘‘no-tool’’ removal.

PACKAGED ROOFTOP COOLING UNIT WITH GAS HEAT —
CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 3 TO 121/2 TONS, NOMINAL COOLING
72,000 TO 250,000 BTUH,
NOMINAL INPUT HEATING
BRYANT MODEL NUMBER: 581B
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop- or slab-mounted, electrically controlled
heating and cooling utilizing a scroll compressor for cooling duty and gas combustion for heating duty. Unit shall
discharge supply air vertically or horizontally as shown on
contract drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/
240 or 360 and 270.
B. Unit shall be designed to conform to ASHRAE 15, latest
revision, and in accordance with UL 1995.
C. Unit shall be UL tested and certified in accordance with
ANSI Z21.47 Standard and UL listed and certified under
Canadian Standards as a total package for safety
requirements.
D. Roof curb shall be designed to conform to NRCA
Standards.
E. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.
F. Unit casing shall be capable of exceeding Federal Test
Method Standard No. 141 (Method 6061) 500-hour Salt
Spray Test.
G. Each 581B unit is subjected to completely automated run
testing on the assembly line. Each unit contains a factorysupplied printout indicating tested pressures, amperages,
data, and inspectors; providing certification of the unit
status at the time of manufacture.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit(s) shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT (STANDARD)
A. General:
Factory-assembled, single-piece heating and cooling unit.
Contained within the unit enclosure shall be all factory
wiring, piping, controls, refrigerant charge (R-22), and
special features required prior to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel,
bonderized and coated with a baked enamel finish
on all externally exposed surfaces, and have primercoated interior surfaces on all panels.
2. Evaporator-fan cabinet interior shall be insulated with
a minimum 1/2-in. thick flexible fiberglass insulation
coated on the air side. Aluminum foil-faced fiberglass
insulation shall be used in the heating compartment.
3. Cabinet panels shall be easily removable for
servicing.
4. Holes shall be provided in the base rails for rigging
shackles to facilitate overhead rigging, and forklift
slots shall be provided to facilitate maneuvering.
5. Unit shall have a factory-installed, sloped condensate drain pan made of a non-corrosive material, providing a minimum 3/4-in. connection with both vertical
and horizontal drains and shall comply with
ASHRAE 62.
6. Unit shall have factory-installed filter access panel to
provide filter access with tool-less removal.
7. Unit shall have standard thru-the-bottom power connection capability.

60

GUIDE SPECIFICATIONS (cont)
I. Controls and Safeties:
1. Unit Controls:
Unit shall be complete with self-contained lowvoltage control circuit protected by a fuse on the 24-v
transformer side.
2. Safeties:
a. Unit shall incorporate a solid-state compressor
protector which provides anti-cycle reset capability at the space thermostat, should any of the
following standard safety devices trip and shut off
compressor.
1) Compressor overtemperature, overcurrent.
2) Loss-of-charge/low-pressure switch.
3) Freeze-protection thermostat, evaporator coil.
4) High-pressure switch.
The lockout protection shall be easily disconnected at the control board, if necessary.
b. Heating section shall be provided with the following minimum protections:
1) High-temperature limit switches.
2) Induced draft motor speed sensor.
3) Flame rollout switch.
4) Flame proving controls
J. Operating Characteristics:
1. Unit shall be capable of starting and running at 125 F
ambient outdoor temperature, meeting maximum
load criteria of ARI Standard 210/240 or 360 at ±10%
voltage.
2. Compressor with standard controls shall be
capable of operation down to 25 F ambient outdoor
temperature.
K. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
factory-predrilled location.
L. Motors:
1. Compressor motors shall be cooled by refrigerant
passing through motor windings and shall have line
break thermal and current overload protection.
2. Indoor blower (evaporator-fan) motor shall have permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
3. Totally enclosed condenser-fan motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
4. Induced-draft motor shall have permanently lubricated, sealed bearings and inherent automatic reset
thermal overload protection.
M. Special Features:
Certain features are not applicable when the features
designated by * are specified. For assistance in amending
the specifications, contact your local sales office.
1. Roof Curbs:
a. Formed galvanized steel with wood nailer strip
and capable of supporting entire unit weight.
b. Allows for installing and securing ductwork to curb
prior to mounting unit on the curb.
*2. Integrated Economizers:
a. Integrated integral-modulating type capable of
simultaneous economizer and compressor
operation.
b. Includes all hardware and controls to provide
cooling with outdoor air.
c. Equipped with low-leakage dampers not to
exceed 3% leakage, at 1 in. wg pressure differential (Durablade economizer).
d. Capable of introducing up to 100% outdoor air in
both minimum and fully open positions.
e. Equipped with a gravity relief sliding plate damper
(Durablade economizer). Damper shall close
upon unit shutoff.

3.

4.

5.

6.

*7.

*8.

9.

10.

61

f. EconoMi$er shall be equipped with a barometric
relief damper with up to 100% of return air (036072) or 90% of return air (090-150) relief. The
Durablade economizer is equipped with 30% of
return-air relief (036-150).
g. Designed to close damper during loss-of-power
situations with emergency power supply (Durablade economizer) or spring return built into
motor (EconoMi$er).
h. Dry bulb outdoor-air thermostat protection shall
be provided as standard.
i. Durablade economizer is a guillotine-style
damper, and the EconoMi$er is a parallel blade
design.
50% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset
to admit up to 50% outdoor air for year-round
ventilation.
25% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset
to admit up to 25% outdoor air for year-round
ventilation.
100% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 100% outdoor air.
b. Damper shall close upon indoor (evaporator) fan
shutoff.
c. Designed to close damper during loss of power
situations.
d. Equipped with 15% barometric relief damper.
25% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 25% outdoor air.
b. Damper shall close upon indoor (evaporator) fan
shutoff.
Solid-State Enthalpy Control:
a. For use with variable sliding economizer package
only.
b. Capable of sensing outdoor-air enthalpy content
(temperature and humidity) and controlling economizer cut-in point to have minimum heat content
air passing over the evaporator coil for most efficient system operation.
Differential Enthalpy Sensor:
a. For use with economizer only.
b. Capable of comparing enthalpy content (temperature and humidity) of outdoor and indoor air and
controlling economizer cut-in point at the most
economical level.
Outdoor-Air Enthalpy Sensor:
The outdoor-air enthalpy sensor shall be used with
the EconoMi$er device to provide single enthalpy
control. When used in conjunction with a return-air
enthalpy sensor, the EconoMi$er device will provide
differential enthalpy control. The sensor allows the
EconoMi$er controller to determine if outside air is
suitable for free cooling.
Return-Air Enthalpy Sensor:
The return-air enthalpy sensor shall be used with the
EconoMi$er device. When used in conjunction with
an outdoor-air enthalpy sensor, the EconoMi$er
device will provide differential enthalpy control.

GUIDE SPECIFICATIONS (cont)
11. Return-Air Temperature Sensor:
The return-air temperature sensor shall be used with
the EconoMi$er device. When used in conjunction
with an outdoor-air temperature sensor, the
EconoMi$er device will provide differential temperature control.
12. Indoor-Air Quality (CO2) Sensor:
Shall have the ability to provide demand ventilation
indoor-air quality (IAQ) control through the
EconoMi$er with an IAQ sensor.
The IAQ sensor shall be available in duct mount, wall
mount and wall mount with LED display. The set
point shall have adjustment capability.
*13. Low Ambient Control Packages:
Each package consists of solid-state control and
condenser-coil temperature sensor to maintain condensing temperature between 90 F and 110 F at outdoor ambient temperatures down to –20 F by
condenser-fan speed modulation or condenser-fan
cycling.
*14. Thermostat and Subbase:
Provides staged cooling and heating automatic (or
manual) changeover, fan control, and indicator light.
15. Thru-The-Bottom Service Connection:
Kit shall provide connectors to permit electrical connections to be brought to the unit through the
basepan.
16. Condenser Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
17. Condenser Coil Guard Grille:
The grille protects the condenser coil from damage
by large objects without increasing unit clearances.
18. Compressor Cycle Delay:
Unit shall be prevented from restarting for a minimum of 5 min. after shutdown.
19. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or
indoor-air filter (CLEAN/DIRTY). Status shall be displayed over communication bus when used with
direct digital controls or with an indicator light at the
thermostat.
20. Unit-Mounted, Non-Fused Disconnect Switch:
Shall be factory-installed, internally-mounted, NEC
and UL approved non-fused switch shall provide unit
power shutoff. Shall be accessible from outside the
unit and shall provide power off lockout capability.
21. Convenience Outlet:
Shall be factory-installed and internally-mounted
with easily accessible 115-v female receptacle. Shall
include 15 amp GFI receptacle with independent
fuse protection. Voltage required to operate convenience outlet shall be provided by a factoryinstalled step-down transformer. Shall be accessible
from outside the unit.
22. High-Static Motor and Drive:
High-static motor and drive shall be factory-installed
to provide additional performance range.
23. EconoMi$er and Power Exhaust:
Package shall provide control of internal building
pressure. The system shall exhaust up to 100% of
return air.

24. Power Exhaust for Accessory EconoMi$er:
Two two-stage power exhausts shall be used in conjunction with EconoMi$er to provide the system with
the capability to exhaust up to 100% of return air.
The power exhaust is a field-installed accessory for
vertical and horizontal applications.
25. Flue Hood Protector Assembly:
Provides protection from the hot sides of the gas flue
hood.
26. Liquid Propane Kit:
Package shall contain all the necessary hardware
and instructions to convert a standard natural gas
unit for use with liquefied propane.
27. NOx Reduction Unit:
Unit shall have reduced nitrous oxide (NOx) emissions to meet the California Air Quality Management
NOx requirement of 40 nanograms/joule or less on
036-060 sizes.
28. Flue Discharge Deflector:
Package shall contain single-piece deflector and
hardware to exhaust the flue discharge up and away
from unit. The flue discharge deflector shall allow
minimum flue side clearances to combustibles to be
reduced to 18 inches.
29. Dehumidification Package:
The dehumidification package is a factory-installed
option that provides increased dehumidification by
further subcooling the hot liquid refrigerant leaving
the condenser coil. The package consists of a subcooling coil located on the leaving-air side of the
evaporator coil. The location of this coil in the indoor
airstream greatly enhances the latent capacity of the
units.
The package shall be equipped with crankcase
heater(s), low pressure switch(es), and thermostatic
expansion valve(s) (TXV). Low pressure switch(es)
prevents evaporator coil freeze up and TXV(s)
assure a positive superheat condition. If the operation of the subcooling coil is controlled by a fieldinstalled, wall-mounted humidistat or LC Thermidistat, the dehumidification circuit will then operate only
when needed. Optional field connections for the
humidistat are made in the low voltage compartment
of the unit control box.
30. Light Commercial Thermidistat:
Field-installed, wall mounted thermidistat is used to
control temperature and activation of Perfect
Humidity™ package. The thermidistat can be set for
humidity settings from 50% to 90% relative humidity.
31. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic thermostat. Shall use built-in compressor cycle delay
control for both heating and cooling duty.
32. Humidistat:
Field-installed, wall-mounted humidistat is used to
control activation of the dehumidification package.
The humidistat can be set for humidity levels
between 20% and 80% relative humidity.
33. Hinged Panel Option:
Hinged panel option provides hinged access panels
for the filter, compressor, evaporator fan, and control
box areas. Filter hinged panels permit tool-less entry
for changing filters. Each hinged panel is permanently attached to the rooftop unit.

62

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS

Copyright 2000 Bryant Heating & Cooling Systems

Printed in U.S.A.

12/00

Catalog No. 5258-103



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