Bryant Single Package Rooftop Electric Cooling Gas Heating Units 581A Users Manual

581A to the manual 151a467c-bbce-40fa-82d8-4ceda81dceab

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installation, start-up and
service instructions

581A
Sizes 155-240

SINGLE PACKAGE ROOFTOP
ELECTRIC COOLING/GAS HEATING UNITS
Cancels: II 581A-155-2

II 581A-155-3
6/15/99

CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
I. Step 1 — Provide Unit Support . . . . . . . . . . . . . . 1
II. Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . 3
III. Step 3 — Field Fabricate Ductwork. . . . . . . . . . . 7
IV. Step 4 — Make Unit Duct Connections . . . . . . . 7
V. Step 5 — Install Flue Hood and Wind
Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VI. Step 6 — Trap Condensate Drain . . . . . . . . . . . . 8
VII. Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . 8
VIII. Step 8 — Make Electrical Connections . . . . . . . 8
IX. Step 9 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
X. Step 10 — Install Outdoor-Air Hood . . . . . . . . . 11
XI. Step 11 — Install All Accessories . . . . . . . . . . . 13
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-25
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-34
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 35-37

WARNING:
1. Improper installation, adjustment, alteration,
service, or maintenance can cause property
damage, personal injury, or loss of life. Refer to
the User’s Information Manual provided with
this unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call the
fire department.

START-UP CHECKLIST. . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may
apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguishers available for all brazing operations.
WARNING: Before performing service or maintenance operations on unit, turn off mail power switch to
unit. electrical shock could cause personal injury.

WARNING: Disconnect gas piping from unit when
pressure testing at pressure greater than 0.5 psig.
Pressures greater than 0.5 psig will cause gas valve
damage resulting in hazardous condition. If gas valve
is subjected to pressure greater than 0.5 psig, it must
be replaced before use. When pressure testing fieldsupplied gas piping at pressures of 0.5 psig or less, a
unit connected to such piping must be isolated by closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the
compressor out of operation. Manual reset will be required to
restart the compressor.
INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble or install accessory roof curb or horizontal supply
roof curb in accordance with instructions shipped with this
accessory. See Fig. 1 and 2. Install insulation, cant strips,
roofing, and counter flashing as shown. Ductwork can be
installed to roof curb or horizontal supply roof curb before
unit is set in place.
(Instructions continued on page 3.)

CRRFCURB010A00

CURB
HEIGHT
ft-in. (mm)
1-2
(305)

CRRFCURB011A00

2-0
(610)

CRRFCURB012A00

2-0
(610)

PKG. NO. REF.

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1 in. thick neoprene coated 11/2 lb density.
3. Dimensions in ( ) are in millimeters.

DESCRIPTION
Standard Curb
14” High
Standard Curb
for Units
Requiring High
Installation
Side Supply
and Return
Curb for High
Installation

4.

Direction of airflow.

5. Roof curb: 16 ga. (VA03-56) stl.
NOTE: To prevent the hazard of stagnant water build-up in the drain
pan of the indoor section, unit can only be pitched as shown.

Dimensions (degrees and inches)

—2—

UNIT
ALL

Fig. 1 — Roof Curb Details

A
DEG.
.28

IN.
.45

B
DEG.
.28

IN.
.43

B. Alternate Unit Support
When a curb or adapter cannot be used, install unit on a
noncombustible surface. Support unit with sleepers, using
unit curb support area. If sleepers cannot be used, support
long sides of unit with a minimum of 3 equally spaced 4-in. x
4-in. pads on each side.
II. STEP 2 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency.
Do not drop unit; keep upright. Spreader bars are not
required if top crating is left on unit. Use spreader bars over
unit to prevent sling or cable damage. Rollers may be used to
move unit across a roof. Level by using unit frame as a reference; leveling tolerance is ± 1/16 in. per linear ft in any direction. See Fig. 3 for additional information. Unit operating
weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.

NOTE: For preassembled horizontal adapter roof curb part no.
(CRRFCURB013A00), the accessory kit includes a factory-designed,
high-static, regain transition duct. For horizontal curb part no.
CRRFCURB012A00, a field-supplied transition duct is required.

A. Positioning
Maintain clearance, per Fig. 4 and 5, around and above unit
to provide minimum distance from combustible materials,
proper airflow, and service access.

Fig. 2 — Horizontal Adapter Roof Curbs
and Roof Curbs

Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air. For proper unit operation, adequate combustion and ventilation air must be provided in accordance with Section 5.3
(Air for Combustion and Ventilation) of the National Fuel
Gas Code, ANSI Z223.1 (American National Standards
Institute).

IMPORTANT: Curb or adapter roof curb must be level. This is
necessary to permit unit drain to function properly. Unit leveling tolerance is ± 1/16 in. per linear ft in any direction. Refer
to Accessory Roof Curb or Horizontal Supply Roof Curb
Installation Instructions for additional information as
required.

Although unit is weatherproof, guard against water from
higher level runoff and overhangs.

When accessory roof curb or horizontal supply roof curb is
used, unit may be installed on class A, B, or C roof covering
material.

Locate mechanical draft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building. When unit is located adjacent to public walkways, flue
assembly must be at least 7 ft above grade.

IMPORTANT: The gasketing of the unit to the roof curb or
adapter roof curb is critical for a watertight seal. Install gasket with the roof curb or adapter as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit
performance.

B. Roof Mount
Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 1.
Instructions continued on page 8.

NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Fig. 4 and 5 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner post from
packaging to protect coil from damage. Use bumper boards for spreader
bars on all units.
5. Weights do not include optional economizer. Add 110 lb (50 kg) for economizer weight.
6. Weights given are for aluminum evaporator and condenser coil plate fins.
7. Add 75 lb (34 kg) for crating on 581A155 and 180 units. Add 135 lb (61 kg)
for crating on 581A240 units.
8. Add 150 lb (68 kg) for copper condenser coil. Add 280 lb (127 kg) for
copper condenser and evaporator coils.

CAUTION: All panels must be in place when rigging.

UNIT
581A

DIMENSIONS

MAXIMUM SHIPPING
WEIGHT

A

B

lb

kg

ft-in.

mm

ft-in.

mm

155

1725

782

6-111/2

2121

4-0

1219

180

1800

816

6-111/2

2121

3-2

964

240

1900

862

6-111/2

2121

3-4

1016

Fig. 3 — Rigging Details

—3—

UNIT
581A
155
180

STD UNIT
WEIGHT
Lb
1725
1800

Kg
782
816

ECONOMIZER
WEIGHT
Lb
Kg
110
50
110
50

CORNER
A
Lb
427
417

Kg
194
189

CORNER
B
Lb
390
399

Kg
177
181

CORNER
C
Lb
438
481

Kg
199
218

CORNER
D
Lb
470
503

Kg
213
228

DIM A
ft-in.
3-3
3-2

mm
991
961

DIM B
ft-in.
3-5
3-6

mm
1051
1070

DIM C
ft-in.
1-10
1-10

mm
559
559

NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3.
4.

—4—

POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)

Center of Gravity.
Direction of airflow.

5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 7 ft-0 in. (2134) for coil removal. This dimension can be reduced
to 4 ft-0 in. (1219) if conditions permit coil removal from the top.
• 4 ft-0 in. (1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4 ft-0 in.(1219) for proper condenser coil airflow.
• Front: 4 ft-0 in. (1219) for control box access.
• Right side: 4 ft-0 in. (1219) for proper operation of damper and power
exhaust if so equipped.
• Top: 6 ft-0 in. (1829) to assure proper condenser fan operation.
• Bottom: 14 in. (356) to combustible surfaces (when not using curb).
• Control box side: 3 ft-0 in. (914) to ungrounded surfaces, non-combustible.
• Control box side: 3 ft-6 in. (1067) to block or concrete walls, or other
grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/
power exhaust as stated in Note no. 6, a removable fence or barricade
requires no clearance.
8. Dimensions are from outside of corner post. Allow 0 ft-5/16 in. (8) on each
side for top cover drip edge.

POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)

581A180 ONLY
FIELD
SUPPLIED

Fig. 4 — Base Unit Dimensions; 581A155 and 180

UNIT

STD. UNIT WEIGHT

ECONOMIZER
WEIGHT

581A240

1900 lbs (862 kg)

110 lbs (50 kg)

NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3.
4.

Center of Gravity.
Direction of airflow.

—5—

5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 7 ft-0 in. (2134) for coil removal. This dimension can be reduced to
4 ft-0 in. (1219) if conditions permit coil removal from the top.
• 4 ft-0 in. (1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4 ft-0 in.(1219) for proper condenser coil airflow.
• Front: 4 ft-0 in. (1219) for control box access.
• Right side: 4 ft-0 in. (1219) for proper operation of damper and power
exhaust if so equipped.
• Top: 6 ft-0 in. (1829) to assure proper condenser fan operation.
• Bottom: 14 in. (356) to combustible surfaces (when not using curb).
• Control box side: 3 ft-0 in. (914) to ungrounded surfaces, non-combustible.
• Control box side: 3 ft-6 in. (1067) to block or concrete walls, or other
grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/power
exhaust as stated in Note no. 6, a removable fence or barricade requires no
clearance.
8. Dimensions are from outside of corner post. Allow 0 ft-5/16 in. (8) on each
side for top cover drip edge.

Fig. 5 — Base Unit Dimensions; 581A240

Table 1 — Physical Data
UNIT 581A
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Unit
Al/Al*
Al/Cu*
Cu/Cu*
Economizer
Roof Curb†
COMPRESSOR
Quantity
Number of Refrigerant Circuits
Crankcase Heater Watts
Oil (oz) (Ckt 1, Ckt 2)

Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type... Length (in.)
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (Rpm)
Movable Pulley Maximum
Full Turns From Closed Position
Factory Speed
Factory Speed Setting (Rpm)
FURNACE SECTION
Rollout Switch Cutout Temp (F) ll
Burner Orifice Diameter (in...drill size)
Natural Gas
Thermostat Heat Anticipator Setting
Stage 1 (amps)
Stage 2 (amps)
Gas Input (Btuh) Stage 1
Stage 2
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
Gas Valve Quantity
Gas Valve Pressure Range (in. wg)
(psig)
Field Gas Connection Size (in.-FPT)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)

1725
1875
2005
110
200

1800
1950
2080
110
200

1900
2050
2180
110
200

2
2
70
60,66

2
2
70
85,60

2
2
70
110,110

20.7
11.9

19.5
13.45

Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static

Low-Medium Static
High Static

6.13
184T
873-1021
1025-1200
Ball
1550
4.9/5.9
4.9/5.9
11/8
9.4
8.0
17/16
1...BX...50
1...BX...48
13.3-14.8

213T
1002-1151
1193-1369
Ball
1550
5.4/6.6
5.4/6.6
13/8
9.4
7.9
17/16
1...BX...54
1...BX...50
14.6-15.4

58
67

37
44

37
44

4††

4††

4††

3.5
978
1327

3.5
965
1134

3.5
1095
1303

190

190

190

0.1285...30/ 0.136...29

0.1285...30/ 0.136...29

0.98
0.8
0.44
0.44
172,000/230,000
225,000/300,000
81
15-45/30-60

0.98
0.8
0.44
0.44
206,000/275,000
270,000/360,000
81
15-45/20-50

3.3
1
5.5-13.5
.235-.487
3
/4

3.3
1
5.5-13.5
.235-.487
3
/4

LEGEND

0.98
0.44

0.8
0.44
206,000/275,000
270,000/360,000
81
15-45/20-50
3.3
1
5.5-13.5
.235-.487
3
/4

426
320
27
44
30 ± 5
45 ± 5
Cleanable
2...20 x 25 x 1
1...20 x 20 x 1
Throwaway
4...20 x 20 x 2
4...16 x 20 x 2

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

Aluminum
Brake Horsepower
Copper
Thermostatic Expansion Valve

9.47 (208 v)

0.1285...30/ 0.136...29

OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)

—
—
—
—

10.33
(230 and 460 v)

3.13
4.38
56H
834-1064
1161-1426
Ball
1550
3.1/4.1
3.7/4.7
7
/8
6.0
5.2
13/16
1...BX...42
1...BX...42
13.5-15.5

LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT (F)
Opens
Closes

Al
Bhp
Cu
TXV

18.5
13.3

Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split
4...15
4...15
4...15
17.5
17.5
17.5
Centrifugal Type
2...10 X 10
2...12 x 12
2...12 x 12
Belt
Belt
Belt
5200
6000
8000
2.9
5
7.5
3.7
1725
1745
1745

EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Nominal Cfm
Std Motor Hp
Opt Motor Hp
Motor Nominal Rpm

Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)

240
20

Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
4...15
4...15
4...15
21.7
21.7
21.7
Propeller Type
10,500
10,500
14,200
3...22
3...22
2...30
1/ ...1050
1/ ...1050
1...1075
2
2
1100
1100
3400

CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts Input (Total)

Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Dia.

180
15

R-22
TXV

REFRIGERANT TYPE
Expansion Device
Operating Charge (lb oz)
Circuit 1**
Circuit 2

Std Maximum Continuous Bhp
Opt Maximum Continuous Bhp
Motor Frame Size
Fan Rpm Range

155
12

*Evaporator coil fin material/condenser coil fin material.
†Weight of 14-in. roof curb.
**Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils, and
Circuit 2 uses the upper portion of both coils.
††Pulley has 6 turns. Due to belt and pulley, moveable pulley cannot be set to 0 to 1 turns open.
llRollout switch is manual reset.

—6—

ductwork may be connected as shown in Fig. 7 and 8. Attach
all ductwork to roof curb and roof curb basepans. Refer to
installation instructions shipped with accessory roof curb for
more information.

III. STEP 3 — FIELD FABRICATE DUCTWORK
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. Use flexible duct
connectors between unit and ducts as required. Adequately
insulate and weatherproof all ductwork located outdoors,
joints, and roof openings with counter flashing and mastic in
accordance with applicable codes. Insulate ducts passing
through unconditioned space, and use vapor barrier in accordance with the latest issue of SMACNA (Sheet Metal and Air
Conditioning Contractors National Association) and ACCA
(Air Conditioning Contractors of America) minimum installation standards for heating and air conditioning systems.

WARNING: For vertical supply and return units,
tools or parts could drop into ductwork and cause an
injury. Install a 90 degree turn in the return ductwork
between the unit and the conditioned space. If a
90 degree elbow cannot be installed, then a grille of
sufficient strength and density should be installed to
prevent objects from falling into the conditioned space.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

V. STEP 5 — INSTALL FLUE HOOD AND WIND BAFFLE
Flue hood, screen, and wind baffle are shipped secured
under main control box. To install, secure flue hood and
screen to access panel with screws provided. See Fig. 9. The
wind baffle is then installed over the flue hood.

A minimum clearance to combustibles of 1 in. for the first
24 in. of ductwork is required for all units with electric heat.
Cabinet return-air static shall not exceed –0.35 in. wg with
economizer or –0.45 in. wg without economizer.

NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 10.

IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS
Unit is shipped for thru-the-bottom duct connections. Ductwork openings are shown in Fig. 1, 4, and 5. Duct
connections are shown in Fig. 6. Field-fabricated concentric

NOTE: Dimensions A, A’, B and
B’ are obtained from field-supplied ceiling diffuser.
NOTE: Do not drill in this area; damage to basepan may result in water
leak.

Shaded areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

Fig. 6 — Air Distribution — Thru-the-Bottom
(581A180, 240 Unit Shown)

WIND
BAFFLE

INLET
LOUVERS

FLUE
SCREEN

NOTE: Do not drill in this area; damage to basepan may result in water
leak.

Fig. 7 — Concentric Duct Air Distribution
(581A180, 240 Unit Shown)

Fig. 9 — Flue Hood Location

—7—

All field wiring must comply with NEC and local requirements. Insulate low-voltage wires for highest voltage contained within conduit when low-voltage control wires are run
in the same conduit as high-voltage wires.

INDUCED DRAFT
MOTOR

INDOOR MOTOR ACCESS

COMBUSTION
FAN HOUSING

MAIN BURNER
SECTION

HEAT EXCHANGER
SECTION

Fig. 10 — Combustion Fan Housing Location
VI. STEP 6 — TRAP CONDENSATE DRAIN
See Fig. 4, 5, and 11 fore drain location. Plug is provided in
drain hole and must be removed when unit is operating. One
3/ in. half coupling is provided inside unit evaporator section
4
for condensate drain connection. An 81/2 in. x 3/4 in. diameter
nipple and a 2 in. x 3/4 in. diameter pipe nipple are coupled to
standard 3/4 in. diameter elbow to provide a straight path
down through holes in unit base rails (see Fig. 11 and 12). A
trap at least 4 inches deep must be used.

FILTER
ACCESS

3/4" FPT DRAIN
CONNECTION

1-3/8"
DRAIN HOLE

Fig. 11 — Condensate Drain Details
(581A155 Shown)

VII. STEP 7 — INSTALL GAS PIPING
The gas supply pipe enters the unit through the 11/2 in.
diameter knockout provided. The gas connection to the unit
is made to the 3/4 in. FPT gas inlet on the gas manifold. Unit
is equipped for use with natural gas. Installation must conform with local building codes or, in the absence of local
codes, with the National Fuel Gas code, ANSI Z223.1.
Install field-supplied manual gas shutoff valve with a 1/8 in.
NPT pressure tap for test gage connection at unit. Field gas
piping must include sediment trap and union. See Fig. 13.
Install sediment trap in riser leading to heating section. This
drip leg functions as a trap for dirt and condensate. Install
trap where condensate cannot freeze. Install this sediment
trap by connecting a piping tee to riser leading to heating
section, so that straight-through section of tee is vertical.
Then, connect capped nipple into lower end of tee. Extend
capped nipple below level of gas controls.

Fig. 12 — Condensate Drain Piping Details

WARNING: Do not pressure test gas supply while
connected to unit. Always disconnect union before
servicing.
IMPORTANT: Natural gas pressure at unit gas connection
must not be less than 5.5 in. wg or greater than 13.5 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.
VIII. STEP 8 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage shown on unit nameplate.
Fig. 13 — Field Gas Piping

When installing units, provide a disconnect per NEC
(National Electrical Code) requirements of adequate size
(Table 2).

—8—

Route power and ground lines through control box end panel
or unit basepan (see Fig. 4 and 5) to connections as shown on
unit wiring diagram and Fig. 14.
CAUTION: The correct power phasing is critical in
the operation of the scroll compressors. An incorrect
phasing will cause the compressor to rotate in the
wrong direction. This may lead to premature compressor failure.

Connect ground lead to chassis ground connection when
using separate ground wire. The unit has a terminal block
for field power connections. Install conduit connectors in side
panel power supply knockout openings indicated in Fig. 4
and 5. Route power lines through connector to unit control
box.
Install a Bryant approved accessory thermostat assembly
according to the installation instructions included with the
accessory. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature.

WARNING: The unit must be electrically grounded
in accordance with local codes and NEC ANSI/NFPA
70 (National Fire Protection Association).

Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through conduit in unit to lowvoltage connections as shown on unit label wiring diagram
and in Fig. 15.

Field wiring must conform to temperature limitations for
type “T” wire. All field wiring must comply with NEC and
local requirements.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C Minimum).

Transformer no. 1 is wired for 230-v unit. If 208/230-v unit is
to be run with 208-v power supply, the transformer must be
rewired as follows:
1. Remove cap from red (208 v) wire.
2. Remove cap from orange (230 v) spliced wire.

All wire larger than no. 18 AWG cannot be directly connected
at the thermostat and will require a junction box and splice
at the thermostat.
Set heat anticipator settings as follows:
VOLTAGE
208/230
460

3. Replace orange wire with red wire.
4. Recap both wires.
IMPORTANT: BE CERTAIN UNUSED WIRES ARE
CAPPED. Failure to do so may damage the transformers.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such operation
would invalidate any warranty.
B. Field Control Wiring
The unit must have a separate electrical service with a fieldsupplied, waterproof, fused disconnect switch mounted at, or
within sight from, the unit. Refer to the unit rating plate for
maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing. Be sure disconnect switch
does not obstruct unit rating plate.
The field-supplied disconnect switchbox may be mounted on
the unit over the high-voltage inlet hole in the control corner
panel.

W1
0.98
0.80

W2
0.44
0.44

The room thermostat heat anticipator must be properly
adjusted to ensure proper heating performance. Set the heat
anticipator to settings based on the table above, by using an
ammeter to determine the exact setting for stages 1 and 2.
Failure to make a proper heat anticipator adjustment may
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization;
however, the required setting may be changed slightly to provide a greater degree of comfort for a particular installation.
Refer to Accessory Remote Control Panel instructions if
required.
STEP 9 — MAKE OUTDOOR-AIR INLET ADJUSTMENTS
A. Manual Outdoor-Air Damper
All units (except those equipped with a factory-installed
economizer) have a manual outdoor-air damper to provide
ventilation air.
Damper can be preset to admit up to 25% outdoor air into
return-air compartment. To adjust, loosen securing screws
and move damper to desired setting. Retighten screws to
secure damper (Fig. 16).
B. Optional Economizer
Economizer Motor Control Module (See Fig. 17-19)
The economizer control location is shown Fig. 17. For maximum benefit of outdoor air, set economizer motor control
module to the “D” setting (Fig. 18). The economizer motor
control module is located on the economizer motor. See
Fig. 19.

NOTE: The maximum wire size for TB1 is 2/0.
LEGEND
EQUIP — Equipment
GND
— Ground
NEC
— National Electrical Code
TB
— Terminal Board

Fig. 15 — Field Control Thermostat Wiring

Fig. 14 — Field Power Wiring Connections

—9—

Table 2 — Electrical Data
UNIT
581A
015
(Standard
IFM)
015
(Optional
IFM)

NOMINAL
VOLTAGE
(3 Ph, 60
Hz)

COMPRESSOR
No. 1
No. 2

Min

Max

RLA

LRA

RLA

LRA

Qty

Hp

FLA (ea)

Hp

208/230

187

253

20.7

156

19.3

123

3

0.5

1.7

2.9

460

414

508

10

70

10

62

3

0.5

0.8

2.9

4.2

3.7

11.0/
10.5

VOLTAGE
RANGE

OFM

POWER
EXHAUST

IFM
FLA
8.8/
8.4

208/230

187

253

20.7

156

19.3

123

3

0.5

1.7

460

414

508

10

70

10

62

3

0.5

0.8

3.7

4.8

208/230

187

253

32.1

195

20.7

156

3

0.5

1.7

5.0

15.8/
15.8

460

414

508

16.4

95

10

70

3

0.5

0.8

5.0

7.9

017

208/230

187

253

42

239

33.6

225

2

1

6.6

7.5

25.0/
25.0

460

414

508

19.2

125

17.3

114

2

1

3.3

7.5

13.0

025

FLA
—
4.6
—
2.3
—
4.6
—
2.3
—
4.6
—
2.3
—
4.6
—
2.3

LRA
—
18.8
—
6.0
—
18.8
—
6.0
—
18.8
—
6.0
—
18.8
—
6.0

COMBUSTION
FAN MOTOR
FLA
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30

POWER
SUPPLY
MCA
59/59
64/63
29
31
61/61
66/65
30
32
82/82
86/86
41
43
124/124
129/129
61
63

MOCP*
70/70
80/80
35
40
80/80
80/80
35
40
110/110
110/110
50
50
150/150
150/150
80
80

EXAMPLE: Supply voltage is 460-3-60.

LEGEND
FLA
— Full Load Amps
HACR — Heating, Air Conditioning and
Refrigeration
IFM
— Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps

AB = 452 v
BC = 464 v
AC = 455 v

Average Voltage =

=

*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. Canadian 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 voltage imbalance.

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 voltage imbalance.

% Voltage Imbalance
= 100 x

max voltage deviation from average voltage

% Voltage Imbalance = 100 x

7
457

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.

—10—

Fig. 16 — 25% Outdoor-Air Section Details

Fig. 19 — Economizer Motor Control
Module Location
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan operation) and close night switch if used.
2. Set system selector switch at OFF position.
3. Turn damper adjustment knob located on control
module clockwise slowly until dampers assume
desired vent position. Do not manually operate economizer motor, since damage to motor will result.
X. STEP 10 — INSTALL OUTDOOR-AIR HOOD
The outdoor-air hood is common to 25% air ventilation and
economizer. If economizer is used, all electrical connections
have been made and adjusted at the factory. Assemble and
install hood in the field.

Fig. 17 — Economizer Damper Assembly-End View

NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (sizes 180 and 240), and filter support
bracket are secured opposite the condenser end of the unit.
The screens, hood side panels, remaining section of filter
support bracket, seal strip, and other hardware are in a
package located inside the return-air filter access panel
(Fig. 20).
1. Attach seal strip to upper filter retainer. See Fig. 21.
2. Assemble hood top panel, side panels, upper filter
retainer, and drain pan (see Fig. 22).

LED —

LEGEND
Light-Emitting Diode

Fig. 18 — Economizer Motor Control Module
(Part Number W7459A)

Fig. 20 — Outdoor-Air Hood Component Location

—11—

3. Secure lower filter retainer and long section of filter
support bracket to unit. See Fig. 22. Leave screws
loose on 180 and 240 units.

8. Insert outdoor-air inlet screens and spacer in channel
created by lower filter retainer and filter support
bracket.

4. Slide baffle (sizes 180 and 240) behind lower filter
retainer and tighten screws.

9. Attach remaining short section of filter support
bracket.

5. Loosen sheet metal screws for top panel of base unitlocated above outdoor-air inlet opening, and remove
screws for hood side panels located on the sides of the
outdoor-air inlet opening.

A. Enthalpy Control Installation
NOTE: The accessory outdoor-air enthalpy sensor must be
installed BEFORE the economizer hoods are installed on the
unit or hoods will have to be removed.

6. Match notches in hood top panel with unit top panel
screws. Insert hood flange between top panel flange
and unit. Tighten screws.

1. Remove and discard the factory-installed jumper
assembly containing the 800-ohm resistor on the
economizer control module (between terminals SR
and +). See Fig. 18.

7. Hold hood side panel flanges flat against unit, and
install screws removed in Step 5.

2. Remove black wire assembly containing the 620-ohm
resistor from between economizer control module terminal SO and the outdoor-air thermostat (OAT). Place
this wire assembly (containing the 620-ohm resistor)
between economizer control module terminals SR and
+, replacing the jumper removed in Step 1. See
Fig. 18.
3. Disconnect the blue wire from the OAT.
4. Remove OAT from the outside of the economizer. See
Fig. 17.
5. Mount the enthalpy sensor (Fig. 23) to the economizer on the outside of the unit (in the same location
from which the OAT was removed) using the 2 screws
provided. See Fig. 17.
6. Reconnect the blue wire removed in Step 3 to the
enthalpy sensor terminal +.

Fig. 21 — Seal Strip Location

7. Cut the violet wire provided to desired length and
terminate with quick-connect terminal provided.
Route the violet wire from the enthalpy sensor terminal S, through the snap bushing, and to the economizer control module terminal SO. See Fig. 18.

BAFFLE (180 AND 240 SIZES ONLY)

8. Set changeover set point to the desired location. See
Fig. 24.
LOWER FILTER
RETAINER

FILTER SUPPORT
BRACKET

NOTE: For maximum benefit of outdoor air, set the enthalpy
control to the “A” setting. At this setting, when the relative
humidity is 50% and the outdoor air is below 74 F, the relay
contacts on the sensor will be closed.
9. Reinstall economizer hoods if removed.
IMPORTANT: Be sure all seal strips and RTV sealant are
intact. A watertight seal to inside of unit must be
maintained.

HOOD TOP
PANEL

HOOD SIDE
PANELS (2)
BAFFLE
(180 AND
240
ONLY)

LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN

Fig. 23 — Outdoor-Air and Return-Air
Enthalpy Sensor

UPPER FILTER RETAINER

NOTE: The outdoor air hood comes with a baffle which is used on
sizes 180 and 240 only. Discard baffle for size 155 units.

Fig. 22 — Outdoor-Air Hood Details

—12—

CONTROL
CURVE
A
B
C
D

11. Reinstall economizer hood if removed.

CONTROL
POINT
(Approx Deg)
AT 50% RH
73
68
63
58

IMPORTANT: Be sure all seal strips and RTV sealant are
intact. A watertight seal to inside of unit must be
maintained.
XI. STEP 11 — INSTALL ALL ACCESSORIES
After all the factory-installed options have been adjusted,
install all field-installed accessories. Refer to the accessory
installation instructions included with each accessory.
A. Motormaster® I Control Installation (581A155 and 180
Only)
Install Field-Fabricated Wind Baffles
Wind baffles must be field-fabricated for all units to ensure
proper cooling cycle operation at low ambient temperatures.
See Fig. 25 for baffle details. Use 20-gage, galvanized sheet
metal, or similar corrosion-resistant metal for baffles. Use
field-supplied screws to attach baffles to unit. Screws should
be 1/4-in. diameter and 5/8-in. long. Drill required screw holes
for mounting baffles.
CAUTION: To avoid damage to the refrigerant coils
and electrical components, use recommended screw
sizes only. Use care when drilling holes.

RH —

Relative Humidity

Fig. 24 — Psychrometric Chart for Solid-State
Enthalpy Control

Install Motormaster I Controls

B. Differential Enthalpy Control
NOTE: The accessory outdoor-air enthalpy sensor must be
installed BEFORE the economizer hoods are installed on the
unit or hoods will have to be removed.
1. Remove and discard the factory-installed jumper
assembly containing the 800-ohm resistor on the
economizer control module (between terminals SR
and +). See Fig. 18.

Only one Motormaster I control is required per unit. The
Motormaster I control must be used in conjunction with the
Accessory 0° F Low Ambient Kit (purchased separately). The
Motormaster I device controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are sequenced off by the Accessory 0° F
Low Ambient Kit.
Accessory 0° F Low Ambient Kit — Install the Accessory 0° F
Low Ambient Kit per instruction supplied with accessory.

2. Disconnect black wire from economizer control module terminal SO and blue wire from the OAT (outdoorair thermostat).
3. Remove OAT and black wire assembly containing the
620-ohm resistor from the outside of the economizer
(see Fig. 17).
4. Mount the outdoor-air enthalpy sensor (first sensor)
to the economizer on the outside of the unit (in the
same location from which the OAT was removed)
using the 2 screws provided. See Fig. 17.
5. Reconnect the blue wire removed in Step 2 to the
enthalpy sensor terminal +.
6. Cut the violet wire provided to desired length and
terminate with quick-connect terminal provided.
Route the violet wire from the enthalpy sensor terminal S, through the snap bushing, and to the economizer control module terminal SO.
7. Mount the second enthalpy sensor in the return-air
duct (return-air sensor).
8. Route the blue wire (provided) from terminal + on the
return-air enthalpy sensor to the economizer control
module terminal +.
9. Route the violet wire (provided) from terminal S on
the return-air enthalpy sensor to the economizer control module terminal SR.
10. Turn changeover set point dial clockwise past the “D”
setting, or the control will not operate on a differential. See Fig. 18.

NOTE: Dimensions in (

—13—

) are in mm.

Fig. 25 — Wind Baffle Details

Sensor Assembly — Install the sensor assembly in the location shown in Fig. 26.
Motor Mount — To ensure proper fan height, replace the
existing motor mount with the new motor mount provided
with accessory.
Transformer (460-v Units Only) — On 460 volt units, a transformer is required. The transformer is provided with the
accessory and must be field-installed.
Motormaster® I Control — Recommended mounting location
is on the inside of the panel to the left of the control box. The
control should be mounted on the inside of the panel, vertically, with leads protruding from bottom of extrusion.
B. Motormaster III Control Installation (581A240)
Install Field-Fabricated Wind Baffles
Wind baffles must be field-fabricated for all units to ensure
proper cooling cycle operation at low ambient temperatures.
See Fig. 25 for baffle details. Use 20-gage, galvanized sheet
metal, or similar corrosion-resistant metal for baffles. Use
field-supplied screws to attach baffles to unit. Screws should
be 1/4-in. diameter and 5/8-in. long. Drill required screw holes
for mounting baffles.

Replace Outdoor Motor
Replace outdoor-fan motor no. 1 with motor included in
accessory kit. Existing motor is not Motormaster III
compatible.
Install Motormaster III Controls
Only one Motormaster III control is required per unit.
Sensor — Install the sensor for thermistor input control in
the location shown in Fig. 26. Connect sensor leads to the
purple and grey control signal leads on the Motormaster III
control.
Signal Selection Switch — Remove the cover of the Motormaster III control. Set the switch to accept the thermistor
sensor input signal. Set the frequency to match the unit
power supply (60 Hz).
Motormaster III Control — Recommended mounting location
is beneath the control box, mounted to the partition that separates the control box section from the indoor section.
NOTE: If unit power is supplied through the roof curb and
basepan of the unit, mount the Motormaster III control on
the corner post adjacent to the conduit running from the
basepan to the bottom of the control box.
START-UP

CAUTION: To avoid damage to the refrigerant
coils and electrical components, use recommended
screw sizes only. Use care when drilling holes.

Use the following information and Start-Up Checklist on
page CL-1 to check out unit PRIOR to start-up.
I. UNIT PREPARATION
Check that unit has been installed in accordance with these
installation instructions and all applicable codes.
II. SERVICE VALVES
Ensure that the liquid line service valve is open. Damage to
the compressor could result if it is left closed.
III. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or
remove compressor holddown bolts.
IV. REFRIGERANT SERVICE PORTS
Each refrigerant system has a total of 3 Schrader-type service gage ports. One port is located on the suction line, one
on the compressor discharge line, and one on the liquid line.
In addition Schrader-type valves are located underneath the
low-pressure switches. Be sure that caps on the ports are
tight.
V. COMPRESSOR ROTATION
It is important to be certain the compressors are rotating in
the proper direction. To determine whether or not compressors are rotating in the proper direction:

MOTORMASTER
SENSOR
LOCATION

1. Connect service gages to suction and discharge pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure does not rise to normal levels:
HAIRPIN END

1. Note that the evaporator fan is probably also rotating
in the wrong direction.

NOTES:
1. All sensors are located on the eighth hairpin up from the bottom.
2. Field installed tubing insulation is required to be installed over the
TXV (thermostatic expansion valve) bulb and capillary tube for
proper operation at low ambients. Tubing insulation is only required
on the portion of suction line located between indoor and outdoor
section.

Fig. 26 — Motormaster I and Motormaster III Sensor
Locations

2. Turn off power to the unit.
3. Reverse any two of the incoming power leads.
4. Turn on power to the compressor.
The suction and discharge pressure levels should now move
to their normal start-up levels.

—14—

NOTE: When compressors are rotating in the wrong direction, the unit will have increased noise levels and will not
provide heating and cooling.
After a few minutes of reverse operation, the scroll compressor internal overload protection will open, which will activate the unit’s lockout and requires a manual reset. Reset is
accomplished by turning the thermostat on and off.

mance, see Evaporator Fan Performance Adjustment section
on page 26.
NOTE: A 31/2-in. bolt and threaded plate are included in the
installer’s packet. They can be added to the motor support
channel below the motor mounting plate to aid in raising the
fan motor.

VI. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten
as required.

IX. CONDENSER FANS AND MOTORS
Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustment section (page 27) as required. Be
sure that fans rotate in the proper direction.

VII. CRANKCASE HEATER(S)
Crankcase heater(s) is energized as long as there is power to
the unit and the compressor is not operating.

X. RETURN-AIR FILTERS
Check that correct filters are installed in filter tracks (see
Table 1). Do not operate unit without return-air filters.

IMPORTANT: Unit power must be on for 24 hours prior to
start-up. Otherwise, damage to compressor may result.

XI. OUTDOOR-AIR INLET SCREENS
Outdoor-air inlet screens must be in place before operating
unit.

VIII. EVAPORATOR FAN
Fan belt and variable pulleys are factory-installed. Remove
tape from the fan pulley. See Tables 3-10 for Fan Performance Data. Be sure that fans rotate in the proper direction.
See Table 11 for air quantity limits. See Table 12 for Evaporator Fan Motor Specifications. See Table 13 for static pressure information for accessories and options. See Table 14 for
fan rpm at various motor pulley settings. To alter fan perfor-

XII. ACCESSORY ECONOMIZER ADJUSTMENT
Remove filter access panel. Check that outdoor-air damper is
closed and return-air damper is open.
Economizer operation and adjustment are described in Base
Unit Operation section on page 24, and in Economizer
Adjustment section on page 28.

Table 3 — Fan Performance — 581A155225 (Low Heat Units with Standard Indoor Fan Motor)
CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Rpm
753
755
788
822
857
891
927
962
998
1035

0.2
Watts
915
991
1129
1280
1443
1620
1810
2014
2233
2466

Rpm
1226
1240
1255
1272
1291
—
—
—
—
—

1.2
Watts
1971
2116
2274
2444
2628
—
—
—
—
—

CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Bhp
1.05
1.14
1.30
1.47
1.66
1.86
2.08
2.32
2.57
2.84

Bhp
2.27
2.43
2.61
2.81
3.02
—
—
—
—
—

Rpm
838
865
894
923
953
984
1015
1047
1080
—

AVAILABLE EXTERNAL STATIC
0.4
0.6
Watts
Bhp
Rpm
Watts
1066
1.23
945
1278
1198
1.38
968
1414
1341
1.54
992
1562
1497
1.72
1017
1722
1666
1.92
1044
1896
1847
2.12
1071
2082
2043
2.35
1099
2282
2252
2.59
1129
2496
2476
2.85
—
—
—
—
—
—

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
1.47
1044
1500
1.63
1063
1639
1.80
1084
1791
1.98
1106
1956
2.18
1130
2133
2.39
1154
2323
2.62
1180
2528
2.87
—
—
—
—
—
—
—
—

Bhp
1.73
1.89
2.06
2.25
2.45
2.67
2.91
—
—
—

Rpm
1138
1154
1172
1191
1212
1234
—
—
—
—

1.0
Watts
1731
1873
2029
2196
2377
2572
—
—
—
—

Bhp
1.99
2.15
2.33
2.53
2.73
2.96
—
—
—
—

Rpm
1311
1322
1335
1350
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
1.4
1.6
Watts
Bhp
Rpm
Watts
2218
2.55
1391
2474
2366
2.72
1401
2623
2526
2.91
—
—
2700
3.10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

PRESSURE (in. wg)
1.8
Bhp
Rpm
Watts
—
—
2.85
3.02
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—
—

Rpm
—
—
—
—
—
—
—
—
—
—

2.0
Watts
—
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 834 to 1064 rpm. Alternate
high-static drive range is 1161 to 1426. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 3.13. The maximum continuous watts is 2700. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—15—

Table 4 — Fan Performance — 581A155225 (Low Heat Units with Optional Indoor Fan Motor)
CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Rpm
753
755
788
822
857
891
927
962
998
1035

0.2
Watts
942
1020
1159
1311
1474
1650
1840
2042
2259
2489

Rpm
1226
1240
1255
1272
1291
1310
1332
1354
1377
1401

1.2
Watts
1968
2111
2267
2436
2616
2810
3018
3238
3473
3722

CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Bhp
1.08
1.17
1.33
1.51
1.70
1.90
2.12
2.35
2.60
2.86

Bhp
2.26
2.43
2.61
2.80
3.01
3.23
3.47
3.72
3.99
4.28

Rpm
838
865
894
923
953
984
1015
1047
1080
1114

AVAILABLE EXTERNAL STATIC
0.4
0.6
Watts
Bhp
Rpm
Watts
1091
1.25
945
1298
1223
1.41
968
1433
1366
1.57
992
1581
1522
1.75
1017
1740
1690
1.94
1044
1912
1871
2.15
1071
2097
2065
2.37
1099
2295
2272
2.61
1129
2506
2492
2.87
1159
2730
2727
3.14
1189
2969

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
1.49
1044
1513
1.65
1063
1652
1.82
1084
1803
2.00
1106
1966
2.20
1130
2141
2.41
1154
2329
2.64
1180
2530
2.88
1207
2745
3.14
1234
2973
3.41
1262
3215

Bhp
1.74
1.90
2.07
2.26
2.46
2.68
2.91
3.16
3.42
3.70

Rpm
1138
1154
1172
1191
1212
1234
1257
1281
1307
1333

1.0
Watts
1737
1878
2032
2197
2376
2567
2771
2989
3221
3466

Bhp
2.00
2.16
2.34
2.53
2.73
2.95
3.19
3.44
3.70
3.99

Rpm
1311
1322
1335
1350
1366
1384
1403
1424
1445
—

AVAILABLE EXTERNAL STATIC
1.4
1.6
Watts
Bhp
Rpm
Watts
2206
2.54
1391
2451
2351
2.70
1401
2598
2509
2.89
1412
2757
2680
3.08
1425
2929
2863
3.29
1440
3115
3059
3.52
1456
3314
3269
3.76
1473
3526
3492
4.02
1491
3751
3730
4.29
—
—
—
—
—
—

PRESSURE (in. wg)
1.8
Bhp
Rpm
Watts
2.82
1468
2702
2.99
1476
2850
3.17
1486
3011
3.37
1497
3185
3.58
1510
3372
3.81
1525
3573
4.05
—
—
4.31
—
—
—
—
—
—
—
—

Bhp
3.11
3.28
3.46
3.66
3.88
4.11
—
—
—
—

Rpm
1543
1549
—
—
—
—
—
—
—
—

2.0
Watts
2959
3108
—
—
—
—
—
—
—
—

Bhp
3.40
3.57
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 834 to 1064 rpm. Alternate
high-static drive range is 1161 to 1426. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the optional motor is 4.38. The maximum continuous watts is 3775. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—16—

Table 5 — Fan Performance — 581A180270 (Low Heat Units)
CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500

Rpm
753
747
741
810
844
879
915
950
986
1022

CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500

Rpm
1044
1065
1086
1132
1157
1182
1208
1235
1262
—

CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500

Rpm
1322
1337
1353
1388
—
—
—
—
—
—

0.2
Watts
1307
1384
1465
1911
2164
2439
2737
3057
3401
3770
1.2
Watts
2345
2561
2795
3324
3619
3935
4274
4636
5021
—
2.2
Watts
3781
4025
4290
4881
—
—
—
—
—
—

Bhp
1.53
1.62
1.72
2.24
2.54
2.86
3.21
3.59
3.99
4.42

Bhp
2.75
3.00
3.28
3.90
4.24
4.62
5.01
5.44
5.82
—

Bhp
4.43
4.72
5.03
5.72
—
—
—
—
—
—

Rpm
761
790
820
882
914
947
980
1013
1047
1081

Rpm
1105
1124
1144
1187
1210
1234
1259
1285
—
—

Rpm
1372
1386
1401
—
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.4
0.6
0.8
Watts
Bhp
Rpm
Watts
Bhp
Rpm
Watts
1330
1.56
840
1572
1.84
912
1822
1515
1.78
866
1765
2.07
936
2023
1718
2.01
893
1977
2.32
961
2243
2182
2.56
950
2459
2.88
1014
2741
2444
2.87
980
2730
3.20
1042
3021
2729
3.20
1010
3023
3.55
1070
3322
3035
3.56
1041
3338
3.91
1099
3645
3364
3.95
1072
3675
4.31
1129
3991
3717
4.36
1104
4037
4.74
1159
4361
4095
4.80
1136
4423
5.19
1189
4755
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Watts
Bhp
Rpm
Watts
Bhp
Rpm
Watts
2619
3.07
1163
2899
3.40
1218
3187
2841
3.33
1180
3127
3.67
1235
3420
3082
3.61
1199
3375
3.96
1252
3674
3624
4.25
1240
3929
4.61
1291
4241
3925
4.60
1262
4239
4.97
1312
4557
4249
4.98
1285
4569
5.36
1334
4894
4595
5.39
1309
4922
5.77
—
—
4964
5.82
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC
2.4
2.6
Watts
Bhp
Rpm
Watts
4088
4.79
1419
4400
4337
5.09
1433
4655
4607
5.40
1448
4930
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 873 to 1021 rpm. Alternate
high-static drive range is 1025 to 1200. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 6.13. The maximum continuous watts is 5180. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

PRESSURE (in. wg)
2.8
Bhp
Rpm
Watts
5.16
1466
4719
5.46
1479
4978
5.78
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
2.14
2.37
2.63
3.21
3.54
3.90
4.28
4.68
5.11
5.58

Rpm
980
1002
1025
1075
1100
1127
1155
1183
1211
1241

1.0
Watts
2080
2289
2516
3029
3317
3626
3957
4311
4689
5091

Bhp
2.44
2.68
2.95
3.55
3.89
4.25
4.64
5.06
5.50
5.97

Bhp
3.74
4.01
4.31
4.97
5.34
5.74
—
—
—
—

Rpm
1271
1287
1304
1341
1361
—
—
—
—
—

2.0
Watts
3481
3720
3979
4558
4880
—
—
—
—
—

Bhp
4.08
4.36
4.67
5.35
5.72
—
—
—
—
—

Bhp
5.53
5.84
—
—
—
—
—
—
—
—

Rpm
1511
—
—
—
—
—
—
—
—
—

3.0
Watts
5042
—
—
—
—
—
—
—
—
—

Bhp
5.91
—
—
—
—
—
—
—
—
—

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—17—

Table 6 — Fan Performance — 581A240270 (Low Heat Units)
CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000

Rpm
824
881
939
998
1056
1116
1175
1235
1295

0.2
Watts
2607
3030
3488
3982
4512
5077
5678
6315
6988

Rpm
1141
1181
1223
1267
1313
1360
1408
1458
1508

1.2
Watts
3829
4247
4702
5194
5721
6285
6885
7521
8193

Rpm
1399
1429
1462
1498
1535
—
—
—
—

2.2
Watts
5118
5527
5974
6459
6981
—
—
—
—

CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000

Bhp
3.09
3.59
4.14
4.72
5.35
6.02
6.74
7.49
8.29

Bhp
4.54
5.04
5.58
6.16
6.79
7.46
8.17
8.92
9.72

Bhp
6.07
6.56
7.09
7.66
8.28
—
—
—
—

Rpm
894
947
1001
1055
1111
1167
1224
1282
1340

Rpm
1196
1234
1274
1316
1359
1405
1451
1499
1549

Rpm
1446
1475
1507
1540
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
0.4
0.6
Watts
Bhp
Rpm
Watts
2844
3.37
961
3085
3266
3.88
1009
3507
3725
4.42
1060
3965
4218
5.00
1111
4458
4748
5.63
1164
4988
5314
6.30
1218
5553
5915
7.02
1272
6154
6552
7.77
1327
6791
7225
8.57
1383
7465

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
3.66
1023
3330
4.16
1069
3751
4.70
1116
4208
5.29
1165
4701
5.92
1215
5230
6.59
1266
5795
7.30
1319
6395
8.06
1372
7033
8.86
1426
7706

Bhp
3.95
4.45
4.99
5.58
6.20
6.87
7.59
8.34
9.14

Rpm
1083
1126
1170
1217
1264
1314
1364
1415
1468

1.0
Watts
3578
3998
4454
4946
5474
6039
6639
7276
7949

Bhp
4.24
4.74
5.28
5.87
6.49
7.16
7.88
8.63
9.43

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Watts
Bhp
Rpm
Watts
Bhp
Rpm
Watts
4082
4.84
1249
4337
5.15
1301
4596
4499
5.34
1285
4753
5.64
1334
5009
4953
5.88
1323
5205
6.18
1371
5460
5443
6.46
1363
5694
6.76
1409
5947
5970
7.08
1405
6220
7.38
1449
6472
6533
7.75
1449
6783
8.05
1491
7034
7132
8.46
1494
7381
8.76
1535
7631
7768
9.22
1540
8016
9.51
—
—
8440
10.01
—
—
—
—
—

Bhp
5.45
5.94
6.48
7.06
7.68
8.34
9.05
—
—

Rpm
1351
1383
1417
1454
1493
1533
—
—
—

2.0
Watts
4856
5267
5716
6202
6726
7286
—
—
—

Bhp
5.76
6.25
6.78
7.36
7.98
8.64
—
—
—

Bhp
7.02
—
—
—
—
—
—
—
—

Rpm
—
—
—
—
—
—
—
—
—

3.0
Watts
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
2.4
2.6
Watts
Bhp
Rpm
Watts
5381
6.38
1492
5647
5789
6.87
1520
6052
6234
7.40
1550
6495
6717
7.97
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 1002 to 1151 rpm. Alternate
high-static drive range is 1193 to 1369. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 9.47 (for 208-v
units) and 10.33 (for 230 and 460-v units). The maximum continuous
watts is 7915 (for 208-v units) and 8640 (for 230 and 460-v units).
Do not adjust motor rpm such that motor maximum bhp and/or watts
is exceeded at the maximum operating cfm.

PRESSURE (in. wg)
2.8
Bhp
Rpm
Watts
6.70
1537
5914
7.18
—
—
7.71
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—18—

Table 7 — Fan Performance — 581A155300 (High Heat Units with Standard Indoor Fan Motor
CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Rpm
753
764
798
832
868
903
939
976
1012
1049

0.2
Watts
915
1006
1147
1301
1467
1648
1842
2050
2273
2511

Rpm
1227
1241
1258
1275
1295
—
—
—
—
—

1.2
Watts
1973
2120
2281
2454
2642
—
—
—
—
—

CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Bhp
1.05
1.16
1.32
1.50
1.69
1.89
2.12
2.36
2.61
2.89

Bhp
2.27
2.44
2.62
2.82
3.04
—
—
—
—
—

Rpm
844
872
901
931
962
994
1026
1059
1093
—

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.4
0.6
0.8
Watts
Bhp
Rpm
Watts
Bhp
Rpm
Watts
1077
1.24
949
1287
1.48
1047
1507
1211
1.39
972
1425
1.64
1067
1648
1357
1.56
997
1576
1.81
1089
1803
1516
1.74
1024
1739
2.00
1112
1970
1688
1.94
1051
1916
2.20
1136
2151
1873
2.15
1079
2106
2.42
1161
2345
2073
2.38
1109
2309
2.66
1188
2553
2286
2.63
1139
2528
2.91
—
—
2514
2.89
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
1.73
1.90
2.07
2.27
2.47
2.70
2.9
—
—
—

Rpm
1139
1156
1175
1195
1217
1240
—
—
—
—

1.0
Watts
1735
1880
2038
2209
2393
2590
—
—
—
—

Bhp
2.00
2.16
2.34
2.54
2.75
2.98
—
—
—
—

Rpm
1310
1323
1337
—
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
1.4
1.6
Watts
Bhp
Rpm
Watts
2218
2.55
1390
2471
2368
2.72
1400
2623
2531
2.91
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—
—

Rpm
—
—
—
—
—
—
—
—
—
—

2.0
Watts
—
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 834 to 1064 rpm. Alternate
high-static drive range is 1161 to 1426. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 3.13. The maximum continuous watts is 2700. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

PRESSURE (in. wg)
1.8
Bhp
Rpm
Watts
—
—
2.84
3.02
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—19—

Table 8 — Fan Performance — 581A155300 (High Heat Units with Optional Indoor Fan Motor)
CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Rpm
753
764
798
832
868
903
939
976
1012
1049

0.2
Watts
942
1035
1177
1331
1498
1677
1871
2077
2298
2533

Rpm
1227
1241
1258
1275
1295
1315
1337
1360
1384
1410

1.2
Watts
1970
2116
2274
2445
2629
2826
3037
3262
3500
3753

CFM
3750
4000
4250
4500
4750
5000
5250
5500
5750
6000

Bhp
1.08
1.19
1.35
1.53
1.72
1.93
2.15
2.39
2.64
2.91

Bhp
2.27
2.43
2.62
2.81
3.02
3.25
3.49
3.75
4.03
4.32

Rpm
844
872
901
931
962
994
1026
1059
1093
1127

AVAILABLE EXTERNAL STATIC
0.4
0.6
Watts
Bhp
Rpm
Watts
1101
1.27
949
1306
1236
1.42
972
1444
1382
1.59
997
1594
1540
1.77
1024
1757
1711
1.97
1051
1932
1896
2.18
1079
2120
2093
2.41
1109
2321
2304
2.65
1139
2536
2529
2.91
1170
2765
2768
3.18
1201
3008

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
1.50
1047
1520
1.66
1067
1661
1.83
1089
1814
2.02
1112
1980
2.22
1136
2158
2.44
1161
2350
2.67
1188
2554
2.92
1215
2773
3.18
1244
3005
3.46
1273
3252

Bhp
1.75
1.91
2.09
2.28
2.48
2.70
2.94
3.19
3.46
3.74

Rpm
1139
1156
1175
1195
1217
1240
1264
1289
1315
1342

1.0
Watts
1741
1885
2041
2209
2390
2585
2793
3015
3250
3500

Bhp
2.00
2.17
2.35
2.54
2.75
2.97
3.21
3.47
3.74
4.03

Rpm
1310
1323
1337
1352
1369
1388
1408
1429
1452
—

AVAILABLE EXTERNAL STATIC
1.4
1.6
Watts
Bhp
Rpm
Watts
2206
2.54
1390
2448
2353
2.71
1400
2597
2513
2.89
1413
2759
2687
3.09
1426
2934
2873
3.30
1442
3122
3073
3.53
1458
3324
3286
3.78
1477
3540
3513
4.04
1496
3769
3755
4.32
—
—
—
—
—
—

PRESSURE (in. wg)
1.8
Bhp
Rpm
Watts
2.82
1467
2696
2.99
1475
2847
3.17
1486
3010
3.37
1498
3187
3.59
1511
3377
3.82
1527
3581
4.07
—
—
4.34
—
—
—
—
—
—
—
—

Bhp
3.10
3.27
3.46
3.67
3.88
4.12
—
—
—
—

Rpm
1541
1548
—
—
—
—
—
—
—
—

2.0
Watts
2951
3102
—
—
—
—
—
—
—
—

Bhp
3.39
3.57
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 834 to 1064 rpm. Alternate
high-static drive range is 1161 to 1426. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the optional motor is 4.38. The maximum continuous watts is 3775. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—20—

Table 9 — Fan Performance — 581A180360 (High Heat Units)
CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500

Rpm
753
747
775
849
886
924
962
1000
1038
1077

0.2
Watts
1307
1384
1571
2054
2329
2628
2951
3298
3672
4072

Rpm
1060
1082
1106
1157
1184
1212
1241
1270
—
—

1.2
Watts
2414
2644
2894
3459
3774
4114
4478
4866
—
—

Rpm
1332
1349
1367
1407
—
—
—
—
—
—

2.2
Watts
3841
4100
4380
5007
—
—
—
—
—
—

CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500
CFM
4500
4800
5100
5700
6000
6300
6600
6900
7200
7500

Bhp
1.53
1.62
1.84
2.41
2.73
3.08
3.46
3.87
4.31
4.78

Bhp
2.83
3.10
3.39
4.06
4.43
4.83
5.25
5.71
—
—

Bhp
4.50
4.81
5.14
5.87
—
—
—
—
—
—

Rpm
786
818
850
918
952
987
1023
1059
1095
1131

AVAILABLE EXTERNAL STATIC
04
0.6
Watts
Bhp
Rpm
Watts
1404
1.65
861
1644
1603
1.88
890
1852
1822
2.14
920
2079
2323
2.73
982
2598
2607
3.06
1015
2891
2915
3.42
1047
3207
3246
3.81
1081
3547
3603
4.23
1115
3912
3986
4.67
1149
4303
4394
5.15
1184
4720

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
1.93
932
1893
2.17
958
2108
2.44
986
2344
3.05
1044
2879
3.39
1074
3180
3.76
1105
3504
4.16
1136
3853
4.59
1168
4225
5.05
1201
4625
5.54
1234
5050

Bhp
2.22
2.47
2.75
3.38
3.73
4.11
4.52
4.96
5.42
5.92

Rpm
997
1022
1048
1102
1130
1160
1190
1220
1251
—

1.0
Watts
2150
2373
2616
3166
3474
3807
4163
4543
4950
—

Bhp
2.52
2.78
3.07
3.71
4.08
4.46
4.88
5.33
5.81
—

Rpm
1119
1140
1163
1211
1236
1263
1290
—
—
—

AVAILABLE EXTERNAL STATIC
1.4
1.6
Watts
Bhp
Rpm
Watts
2685
3.15
1175
2964
2922
3.43
1195
3207
3178
3.73
1216
3470
3757
4.41
1262
4061
4080
4.79
1287
4391
4427
5.19
1312
4745
4798
5.63
1338
5122
—
—
—
—
—
—
—
—
—
—
—
—

PRESSURE (in. wg)
1.8
Bhp
Rpm
Watts
3.48
1230
3250
3.76
1248
3498
4.07
1268
3767
4.76
1312
4371
5.15
1335
4707
5.57
1359
5067
6.01
—
—
—
—
—
—
—
—
—
—
—

Bhp
3.81
4.10
4.42
5.13
5.52
5.94
—
—
—
—

Rpm
1282
1299
1319
1360
1382
—
—
—
—
—

2.0
Watts
3542
3795
4071
4686
5029
—
—
—
—
—

Bhp
4.15
4.45
4.77
5.50
5.90
—
—
—
—
—

Rpm
1381
1397
1414
—
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
2.4
2.6
Watts
Bhp
Rpm
Watts
4145
4.86
1428
4456
4409
5.17
1443
4725
4695
5.51
1460
5016
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

PRESSURE (in. wg)
2.8
Bhp
Rpm
Watts
5.23
1473
4772
5.54
1488
5046
5.88
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
5.60
5.92
—
—
—
—
—
—
—
—

Rpm
1518
—
—
—
—
—
—
—
—
—

3.0
Watts
5095
—
—
—
—
—
—
—
—
—

Bhp
5.98
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 873 to 1021 rpm. Alternate
high-static drive range is 1025 to 1200. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 6.13. The maximum continuous watts is 5180. Do not adjust motor rpm such that
motor maximum bhp and/or watts is exceeded at the maximum
operating cfm.

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—21—

Table 10 — Fan Performance — 581A240360 (High Heat Units)
CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000

Rpm
868
929
991
1054
1117
1180
1244
1308
1372

0.2
Watts
2752
3201
3687
4211
4773
5373
6011
6687
7401

Rpm
1171
1215
1262
1310
1360
1412
1465
1519
—

1.2
Watts
3965
4410
4894
5415
5976
6575
7212
7888
—

Rpm
1422
1456
1493
1533
—
—
—
—
—

2.2
Watts
5243
5679
6155
6670
—
—
—
—
—

CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
CFM
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000

Bhp
3.26
3.80
4.37
5.00
5.66
6.37
7.13
7.93
8.78

Bhp
4.70
5.23
5.81
6.42
7.09
7.80
8.56
9.36
—

Bhp
6.22
6.74
7.30
7.91
—
—
—
—
—

Rpm
934
991
1049
1109
1168
1229
1290
1352
1414

AVAILABLE EXTERNAL STATIC
0.4
0.6
Watts
Bhp
Rpm
Watts
2987
3.54
997
3227
3436
4.08
1051
3675
3923
4.65
1105
4161
4447
5.28
1161
4686
5009
5.94
1218
5247
5609
6.65
1277
5847
6247
7.41
1335
6485
6924
8.21
1395
7162
7638
9.06
1455
7876

PRESSURE (in. wg)
0.8
Bhp
Rpm
Watts
3.83
1058
3470
4.36
1108
3917
4.94
1159
4403
5.56
1213
4926
6.22
1267
5488
6.94
1323
6088
7.69
1380
6726
8.50
1437
7402
9.34
1496
8117

Bhp
4.12
4.65
5.22
5.84
6.51
7.22
7.98
8.78
9.63

Rpm
1115
1162
1211
1262
1314
1368
1423
1479
1535

1.0
Watts
3716
4163
4647
5170
5731
6331
6968
7644
8358

Bhp
4.41
4.94
5.51
6.13
6.80
7.51
8.27
9.07
9.92

Rpm
1224
1266
1311
1357
1405
1455
1506
—
—

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Watts
Bhp
Rpm
Watts
Bhp
Rpm
Watts
4216
5.00
1276
4469
5.30
1326
4726
4659
5.53
1316
4911
5.83
1364
5165
5142
6.10
1358
5392
6.40
1404
5645
5663
6.72
1403
5912
7.01
1447
6164
6222
7.38
1449
6471
7.68
1492
6721
6821
8.09
1497
7068
8.39
1538
7318
7457
8.85
1547
7705
9.14
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
5.61
6.13
6.70
7.31
7.97
8.68
—
—
—

Rpm
1374
1411
1449
1490
1533
—
—
—
—

2.0
Watts
4983
5421
5899
6416
6973
—
—
—
—

Bhp
5.91
6.43
7.00
7.61
8.27
—
—
—
—

Rpm
1468
1501
1536
—
—
—
—
—
—

AVAILABLE EXTERNAL STATIC
2.4
2.6
Watts
Bhp
Rpm
Watts
5505
6.53
1513
5768
5938
7.04
1544
6199
6412
7.61
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—

Rpm
—
—
—
—
—
—
—
—
—

3.0
Watts
—
—
—
—
—
—
—
—
—

Bhp
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
*Standard low-medium static drive range is 1002 to 1151 rpm. Alternate
high-static drive range is 1193 to 1369. Other rpms require a fieldsupplied drive.
NOTES:
1. Maximum continuous bhp for the standard motor is 9.47 (for 208-v
units) and 10.33 (for 230 and 460-v units). The maximum continuous
watts is 7915 (for 208 and 575-v units) and 8640 (for 230 and 460-v
units). Do not adjust motor rpm such that motor maximum bhp and/
or watts is exceeded at the maximum operating cfm.

PRESSURE (in. wg)
2.8
Bhp
Rpm
Watts
—
—
6.84
7.35
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2. Static pressure losses (i.e., economizer) must be added to external
static pressure before entering Fan Performance table.
3. Interpolation is permissible. Do not extrapolate.4
4. Fan performance is based on wet coils, clean filters, and
casing losses. See Table 13 for accessory/FIOP static pressure
information.
5. Extensive motor and drive testing on these units ensures that the full
bhp and watts range of the motor can be utilized with confidence.
Using your fan motors up to the watts or bhp rating shown will not
result in nuisance tripping or premature motor failure. Unit warranty
will not be affected.
6. Use of a field-supplied motor may affect wiring size. Contact your
Bryant representative for details.

—22—

Table 11 — Air Quantity Limits
UNIT
581A
155
180
240

MINIMUM
CFM
3600
4500
6000

MAXIMUM
CFM
6,000
7,500
10,000

Table 12 — Evaporator Fan Motor Specifications
UNIT
581A
155
(Standard
Motor)
155
(Optional
Motor)

NOMINAL
Hp
2.9
2.9
2.9
3.7
3.7
3.7
5
5
5
7.5
7.5
7.5

180
240

MAX
WATTS
2700
2700
2700
3775
3775
3775
5180
5180
5180
7915
8640
8640

VOLTAGE
208
230
460
208
230
460
208
230
460
208
230
460

EFF.
85.8%
85.8%
85.8%
85.8%
85.8%
85.8%
87.5%
87.5%
87.5%
88.5%
88.5%
88.5%

MAX
BHP
3.13
3.13
3.13
4.38
4.38
4.38
6.13
6.13
6.13
9.47
10.33
10.33

MAX
BkW
2.34
2.34
2.34
3.27
3.27
3.27
4.57
4.57
4.57
7.06
7.71
7.71

MAX
AMPS
9.46
8.6
4.3
10.5
10.5
4.8
15.8
15.8
7.9
22
22
13

BHP — Brake Horsepower

Table 13 — Accessory/FIOP Economizer Static Pressure (in. wg)
UNIT
581A

UNIT
VOLTAGE

155, 180

All

240

All

ECONOMIZER
PRESSURE DROP
.03
.03
.05
.07
.10
.07
.09
.11
.12

CFM
3,750
4,000
5,000
6,000
7,500
6,000
7,200
9,000
10,000

LEGEND
bhp — Brake Horsepower
FIOP — Factory-Installed Option

NOTES:
1. The factory-assembled horizontal adapter substantially improves fan
performance. See Fig. 27.
2. The static pressure must be added to external static pressure. The
sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance table to determine blower rpm,
bhp, and watts.

Table 14 — Fan RPM at Motor Pulley Setting*
/2

1

1 /2

2

21/2

3

31/2

4

41/2

5

51/2

6

††

††

††

††

1064

1035

1006

978

949

920

891

863

834

155**

††

††

††

††

1426

1393

1360

1327

1294

1261

1227

1194

1161

180†

††

††

††

††

1021

1002

984

965

947

928

910

891

873

180**

††

††

††

††

1200

1178

1156

1134

1112

1091

1069

1047

1025

240†

††

††

††

††

1151

1132

1114

1095

1077

1058

1040

1021

1002

240**

††

††

††

††

1369

1347

1325

1303

1281

1259

1237

1215

1193

581A

0

155†

1

1

*Approximate fan rpm shown.
†Indicates standard drive package.
**Indicates alternate drive package.
††Due to belt and pulley style, pulley cannot be set to this number of turns open.

—23—

When ignition occurs the IGC board will continue to monitor
the condition of the rollout and limit switches, the hall effect
sensor, as well as the flame sensor. If the unit is controlled
through a room thermostat set for fan auto.,45 seconds after
ignition occurs, the indoor-fan motor will be energized (and
the outdoor-air dampers will open to their minimum position). If for some reason the overtemperature limit opens
prior to the start of the indoor fan blower, on the next
attempt, the 45-second delay will be shortened to 5 seconds
less than the time from initiation of heat to when the limit
tripped. Gas will not be interrupted to the burners and heating will continue. Once modified, the fan on delay will not
change back to 45 seconds unless power is reset to the
control.

Fig. 27 — Fan Performance Using Accessory
Power Exhaust
XIII. GAS HEAT
Verify gas pressures before turning on heat as follows:
1. Turn off manual gas stop.
2. Connect pressure gage to supply gas pressure tap
(see Fig. 13).
3. Connect pressure gage to manifold pressure tap on
gas valve.
4. Turn on manual gas stop and set thermostat to
HEAT position. After the unit has run for several
minutes, verify that incoming pressure is 5.5 in. wg
or greater, and that the manifold pressure is
3.3 in. wg. If manifold pressure must be adjusted,
refer to Gas Valve Adjustment section on page 29.
5. After unit has been in operation for 5 minutes, check
temperature rise across the heat exchangers. See unit
informative plate for correct rise limits of the heat
supplied. Air quantities may need to be adjusted to
bring the actual rise to within the allowable limits.

When additional heat is required, W2 closes and initiates
power to the second stage of the main gas valve. When the
thermostat is satisfied, W1 and W2 open and the gas valve
closes, interrupting the flow of gas to the main burners. If
the call for W1 lasted less than 1 minute, the heating cycle
will not terminate until 1 minute after W1 became active. If
the unit is controlled through a room thermostat set for fan
auto., the indoor-fan motor will continue to operate for an
additional 45 seconds then stop (and the outdoor-air dampers will close). If the overtemperature limit opens after the
indoor motor is stopped within 10 minutes of W1 becoming
inactive, on the next cycle the time will be extended by
15 seconds. The maximum delay is 3 minutes. Once modified, the fan off delay will not change back to 45 seconds
unless power is reset to the control.
A LED indicator is provided on the IGC to monitor operation. The IGC is located by removing the side panel and
viewing the IGC through the view port located in the control
box access panel. See Fig. 28. During normal operation, the
LED is continuously on. See Table 15 for error codes.
Table 15 — IGC LED Indications
ERROR CODE
Normal Operation
HardwareFailure
Fan On/Off Delay
Modified
Limit Switch Fault
Flame Sense Fault
Five Consecutive Limit
Switch Faults
Ignition Lockout Fault
Inducer Switch Fault
Rollout Switch Fault
Internal Control Fault

XIV. BASE UNIT OPERATION
A. Cooling, Units Without Economizer
When thermostat calls for cooling, terminals G and Y1 are
energized. The indoor (evaporator) fan contactor (IFC) andcompressor contactor no. 1 (C1) are energized and evaporator-fan motor (IFM), compressor no. 1 and condenser fan
start. The condenser-fan motors run continuously while unit
is 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.

LED INDICATION
On
Off
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes

LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode

B. Heating, Units Without Economizer
NOTE: The 581A155-240 units have 2 stages of heat.
When the thermostat calls for heating, power is sent to W on
the IGC (integrated gas unit controller) board. An LED
(light-emitting diode) on the IGC board will be on during
normal operation. A check is made to ensure that the rollout
switch and limit switch are closed and the induced-draft
motor is running. The induced-draft motor is then energized,
and when speed is proven with the hall effect sensor on the
motor, the ignition activation period begins. The burners will
ignite within 5 seconds.
If the burners do not light, there is a 22-second delay before
another 5-second attempt. If the burners still do not light,
this sequence is repeated for 15 minutes. After the 15 minutes have elapsed, if the burners still have not lighted, heating is locked out. To reset the control, break 24-v power to
the thermostat.

NOTES:
1. There is a 3-second pause between error code displays.
2. If more than one error code exists, all applicable error codes will be
displayed in numerical sequence.
3. Error codes on the IGC will be lost if power to the unit is interrupted.

C. Cooling, Units With Economizer
Upon a call for cooling, when outdoor ambient is above the
changeover control setting, the economizer damper moves to
VENT position. The compressors and evaporator and condenser fans energize and operate as per Cooling, Units Without Economizer section on this page.
Upon a first call for cooling, when outdoor ambient is below
the changeover control setting, the evaporator fan starts and
the economizer is fully open. The compressors remain off.

—24—

Upon a second-stage call for cooling, compressor no. 1 is
energized and mechanical cooling is integrated with economizer cooling. If the outdoor-air temperature drops below
50 F, a cooling lockout switch prevents the compressors from
running.
When supply-air temperature drops below a fixed set point,
the economizer damper modulates to maintain the temperature at the fixed set point.
D. Freeze Protection Thermostats
A freeze protection thermostat is located on the top and bottom of the evaporator coil. It detects frost build-up and locks
out the compressors, allowing the coil to clear. Once frost has
melted, the compressors can be reenergized by resetting the
compressor lockout.
E. Heating, Units With Economizer
Outdoor-air damper stays at VENT position while evaporator fan is operating. Refer to Heating, Units without Economizer section on page 24 for heating sequence of operation.

Use caution with ceramic heat exchanger baffles. When
installing retaining clip, be sure the center leg of the clip
extends inward toward baffle. See Fig. 29.
H. Combustion-Air Blower
Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect
blower wheel bi-monthly to determine proper cleaning
frequency.
To inspect blower wheel, remove heat exchanger access
panel. Shine a flashlight into opening to inspect wheel. If
cleaning is required, remove motor and wheel assembly by
removing screws holding motor mounting plate to top of combustion fan housing (Fig. 28). The motor and wheel assembly
will slide up and out of the fan housing. Remove the blower
wheel from the motor shaft and clean with a detergent or solvent. Replace motor and wheel assembly.

SERVICE

INDUCED DRAFT
MOTOR

WARNING: Before performing service or maintenance operations on unit, turn off main power switch
to unit. Electrical shock could cause personal injury.

INTEGRATED GAS
UNIT CONTROLLER
(HIDDEN)

IGC LED
VIEW
PORT

CONTROL BOX
ACCESS PANEL

I. CLEANING
Inspect unit interior at beginning of each heating and cooling
season and as operating conditions require. Remove unit top
panel and/or side panels for access to unit interior.
A. Evaporator Coil
Clean as required with commercial coil cleaner. Wash both
sides of coil and flush with clean water.
B. Condenser Coil
Clean condenser coil annually and as required by location
and outdoor-air conditions. Inspect coil monthly; clean as
required.
C. Condensate Drain
Check and clean each year at start of cooling season. In winter, keep drains and traps dry.

COMBUSTION
FAN HOUSING

MAIN BURNER FLUE BOX MAIN GAS FIELD GAS
SECTION
COVER
VALVE
CONNECTION

Fig. 28 — Typical Gas Heating Section

D. Filters
Clean or replace at start of each heating and cooling season,
or more often if operating conditions require. Refer to Table 1
for type and size.

CERAMIC
BAFFLE

E. Outdoor-Air Inlet Screens
Clean screens with steam or hot water and a mild detergent.
Do not use throwaway filters in place of screens. See Table 1
for quantity and size.

CLIP

F. Main Burner
At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe
the main burner flames. Refer to Main Burners section on
page 29.
G. Flue Gas Passageways
The flue collector box and heat exchanger cells may be
inspected by removing heat exchanger access panel (Fig. 4
and 5), flue box cover, and main burner assembly (Fig. 28).
Refer to Main Burners section on page 29 for burner removal
sequence. If cleaning is required, remove heat exchanger baffles and clean tubes with a wire brush.

HEAT EXCHANGER
TUBES

NOTE: One baffle and clip will be in each upper tube of the heat
exchanger.

—25—

Fig. 29 — Removing Heat Exchanger Ceramic Baffles
and Clips

II. LUBRICATION

2. Slide fan pulley along fan shaft.

A. Compressors
Each compressor is charged with the correct amount of oil at
the factory. Conventional white oil (Sontex 200LT) is used.
White oil is compatible with 3GS oil, and 3GS oil may be
used if the addition of oil is required. See compressor nameplate for original oil charge. A complete recharge should be
four ounces less than the original oil charge When a compressor is exchanged in the field it is possible that a major
portion of the oil from the replaced compressor may still be
in the system. While this will not affect the reliablity of the
replacement compressor, the extra oil will add rotor drag and
increase power usage. To remove this excess oil, an access
valve may be added to the lower portion of the suction line at
the inlet of the compressor. The compressor should then be
run for 10 minutes, shut down and the access valve opened
until no oil flows. This should be repeated twice to make sure
the proper oil level has been achieved.

3. Make angular alignment by loosening motor from
mounting plate.

B. Fan Shaft Bearings
For size 155 units, bearings are permanently lubricated. No
field lubrication is required. For size 180 and 240 units,
lubricate bearings at least every 6 months with suitable
bearing grease. Extended grease line is provided for far side
fan bearing (opposite drive side). Typical lubricants are
given below:
MANUFACTURER
Texaco
Mobil
Sunoco
Texaco

LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2

IV. EVAPORATOR FAN SERVICE AND REPLACEMENT
A. 581A155 Units (See Fig. 31)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Loosen carriage nuts A and B holding motor mount
assembly to fan scroll side plates.
4. Loosen screw C.
5. Rotate motor mount assembly (with motor attached)
as far as possible away from evaporator coil.
6. Remove belt.
7. Rotate motor mount assembly back past original
position toward evaporator coil.
8. Remove motor mounting nuts D and E (both sides).
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
B. 581A180 and 240 Units (See Fig. 32)
The 581A180 and 240 units use a fan motor mounting system that features a slide-out motor mounting plate. To
replace or service the motor, slide out the bracket.
1. Remove the evaporator-fan access panel and the
heating control access panel.

*Preferred lubricant because it contains rust and oxidation inhibitors.

C. Condenser and Evaporator-Fan Motor Bearings
The
condenserand
evaporator-fan motors
have
permanently sealed bearings, so no field lubrication is
necessary.

2. Remove the center post (located between the evaporator fan and heating control access panels) and all
screws securing it.
3. Loosen nuts on the 2 carriage bolts in the motor
mounting base.

III. EVAPORATOR FAN PERFORMANCE ADJUSTMENT
(Fig. 30-32)
Fan motor pulleys are factory set for speed shown in Table 1.

4. Using jacking bolt under motor base, raise motor to
top of slide and remove belt. Secure motor in this
position by tightening the nuts on the carriage bolts.

To change fan speeds:

5. Remove the belt drive.

1. Shut off unit power supply.
2. Size 155 only:
Loosen belt by loosening carriage nuts holding motor
mount assembly to fan scroll side plates (A and B).
Size 180, 240 only:
Loosen nuts on the 2 carriage bolts in the mounting
base. Install jacking bolt and plateunder motor base
(bolt and plate are shipped in installer’s packet).
Using bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tightening the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 30).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1.
See Table 11 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub
and tighten setscrew. (See Table 1 for speed change
for each full turn of pulley flange.)
6. Replace and tighten belts (see Belt Tension Adjustment section on page 27).
To align fan and motor pulleys:

Fig. 30 — Evaporator-Fan Alignment and Adjustment

1. Loosen fan pulley setscrews.

—26—

10. Disconnect wiring connections and remove the 4
mounting bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
V. BELT TENSION ADJUSTMENT
To adjust belt tension:
1. Loosen fan motor bolts.
2. Size 155 Units:
Move motor mounting plate up or down for proper
belt tension (1/2 in. deflection with one finger).
Size 180 and 240 Units:
Turn motor jacking bolt to move motor mounting
plate up or down for proper belt tension (3/8 in. deflection at midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure
motor in fixed position.
VI. CONDENSER-FAN ADJUSTMENT
A. 581A155 and 180 Units (Fig. 33)
1. Shut off unit power supply.
2. Remove access panel(s) closest to the fan to be
adjusted.
3. Loosen fan hub setscrews.
4. Adjust fan height on shaft using a straightedge
placed across the fan orifice.

Fig. 31 — 581A155 Evaporator-Fan Motor Adjustment

5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
B. 581A240 Units (Fig. 34)
1. Shut off unit power supply.
2. Remove fan top-grille assembly and loosen fan hub
screws.
3. Adjust fan height on unit, using a straightedge
placed across the fan orifice.

NOTE: Dimension is in inches.

Fig. 33 — Condenser Fan Adjustment, 581A155 and 180

NOTE: A 31/2-in. bolt and threaded plate are included in the installer’s
packet. They should be added to the motor support channel below the
motor mounting plate to aid in raising the motor. The plate part number
is 50DP503842. The adjustment bolt is 3/8 - 16 x 13/4-in. LG.

Fig. 32 — 581A180 and 240 Evaporator-Fan Motor Section

6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor support channel that interfere with the motor slide path.

NOTE: Dimension is in inches.

9. Slide out the motor and motor mounting plate.

—27—

Fig. 34 — Condenser Fan Adjustment, 581A240

4. Tighten setscrews and replace rubber hubcap to prevent hub from rusting to motor shaft.

5. Set the outdoor-air thermostat (OAT), located in the
economizer section of the unit (see Fig. 17) to 75 F.

5. Fill hub recess with permagum if rubber hubcap is
missing.

6. If the outdoor temperature is below 75 F, the economizer will control the mixed air with the mixed-air
sensor. If the outdoor air is above 75 F, place a jumper
around the contacts of the OAT.

VII. ECONOMIZER ADJUSTMENT
See Tables 16 and 17 for checkout and outdoor air temperature simulation. Make certain the outdoor-air damper is
fully closed and the return-air damper is fully open before
completing the following steps:

7. Jumper terminal T to terminal T1 on the module (see
Fig. 18). The economizer will go to the full open position. The outdoor-air damper will go to the full open
position, and the return-air damper will go to the full
closed position.

1. Turn on power to the unit.
2. Turn the thermostat fan switch to the ON position.
The damper will go to the vent position.

8. Adjust mechanical linkage, if necessary, for correct
positioning. If may be necessary to remove the filters
to adjust the linkage.

3. Adjust the vent position with the minimum damperposition adjustment on the economizer motor control
module. See Fig. 18.

9. Remove the jumper from around the contacts of the
OAT if installed in Step 6. Remove the jumper from
terminals T and T1 installed in Step 7.

4. Set the system selector switch to COOL position and
set the cooling temperature selector to its lowest
setting.
NOTE: The Cooling mode may also be simulated by
removing the thermostat wires from terminals Y1
and Y2 and installing a jumper between terminals R
and Y1. Refer to unit label diagram for terminal
locations.
Table 16 — Economizer Checkout Procedures
A.

B.
C.
D.

E.

TEST PROCEDURE
Disconnect power at
TR and TR1.
Disconnect jumper
between P and
P1. See Fig. 18.
Jumper TR to 1.
Jumper T1 to T.
Disconnect outdoor-air
thermostat connections
from SO and +.
Factory-installed
800 ohm resistor
should remain connected
to SR and +.
Reconnect power to
terminals TR and TR1.

RESULTS

IX. REFRIGERANT CHARGE
Amount of refrigerant charge is listed on unit nameplate and
in Table 1. Refer to Carrier GTAC II; Module 5; Charging,
Recovery, Recycling, and Reclamation section for charging
methods and procedures. Unit panels must be in place when
unit is operating during charging procedure.

A. No Charge
Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to
Table 1).

RESULTS

1. LED should be on.
2. Motor drives toward open.

Table 17 — High and Low Outdoor-Air Simulation
TEST PROCEDURE
A. Reconnect factory-installed
800 ohm resistor
between terminals
SR and +.
B. Connect 1200 ohm
checkout resistor between
terminals SO and +.
C. Turn set point potentiometer
to position A.

VIII. POWER FAILURE
Dampers have a spring return. In event of power failure,
dampers will return to fully closed position until power is
restored. Do not manually operate damper motor.

NOTE: Do not use recycled refrigerant as it may contain
contaminants.

1. LED (light-emitting diode)
should be off.
2. Motor is in closed position.
TEST PROCEDURE
Disconnect factory-installed
resistor from terminals
SR and +.

10. If the Cooling mode was simulated to operate the unit
in Step 4, remove the jumper and reconnect the thermostat wires to terminals Y1 and Y2.

RESULTS

Low outdoor-air test results:
1. LED (light-emitting
diode)should be on.
2. Motor drives toward open.
D. Turn set point potentiometer
to position D.
E. Disconnect 1200 ohm
checkout resistor.

B. Low Charge Cooling
Using appropriate cooling charging chart (see Fig. 35), add
or remove refrigerant until conditions of the chart are met.
Note that charging chart is different from those normally
used. An accurate pressure gage and temperature-sensing
device is required. Charging is accomplished by ensuring the
proper amount of liquid sub-cooling. Measure liquid line
pressure at the liquid line service valve using pressure gage.
Connect temperature sensing device to the liquid line near
the liquid line service valve and insulate it so that outdoor
ambient temperature does not affect reading.
C. To Use the Cooling Charging Chart
Use the above temperature and pressure readings, and find
the intersection point on the cooling charging chart. If intersection point on chart is above line, add refrigerant. If intersection point on chart is below line, carefully recover some of
the charge. Recheck suction pressure as charge is adjusted.
NOTE: Indoor-air CFM must be within normal operating
range of unit. All outdoor fans must be operating.
The TXV (thermostatic expansion valve) is set to maintain
between 15 and 20 degrees of superheat at the compressors.
The valves are factory set and should not require
re-adjustment.

High outdoor-air test results:
1. LED should be off.
2. Motor drives toward closed.

—28—

9. Remove 2 screws that hold the burner support plate
flange to the vestibule plate.

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
140

10. Lift burner assembly out of unit.
B. Cleaning and Adjustment
1. Remove burner rack from unit as described in Main
Burner Removal section above.

120
ADD CHARGE IF ABOVE CURVE

100

2. Inspect burners, and if dirty, remove burners from
rack.

80

3. Using a soft brush, clean burners and crossover port
as required.
4. Adjust spark gap. See Fig. 37.
REDUCE CHARGE IF BELOW CURVE

5. Reinstall burners on rack.

60

6. Reinstall burner rack as described above.
40
50

150
100
200
250
350
300
LIQUID PRESSURE AT LIQUID VALVE (PSIG)

XII. FILTER DRIER
Replace whenever
atmosphere.

400

Fig. 35 — Cooling Charging Chart

refrigerant

system

is

exposed

to

XIII. PROTECTIVE DEVICES
A. Compressor Protection

X. GAS VALVE ADJUSTMENT

Overcurrent

A. Natural Gas
The gas valve opens and closes in response to the thermostat
or limit control.

Each compressor has internal line break motor protection.

When power is supplied to valve terminals D1 and C2, the
main valve opens to its preset position.
The regular factory setting is stamped on the valve body
(3.3 in. wg).

Overtemperature
Each compressor has an internal protector to protect it
against excessively high discharge gas temperatures.
Crankcase Heater

2. Turn main gas valve to OFF position.

The 581A units are equipped with a 70-watt crankcase
heater to prevent absorption of liquid refrigerant by oil in
the crankcase when the compressor is idle. The crankcase
heater is energized whenever there is main power to the unit
and the compressor is not energized.

3. Remove 1/8-in. pipe plug from manifold or gas valve
pressure tap connection. Install a suitable pressuremeasuring device.

IMPORTANT: After prolonged shutdown or servicing, energize the crankcase heaters for 24 hours before starting the
compressors.

To adjust regulator:
1. Set thermostat at setting for no call for heat.

4. Set main gas valve to ON position.

Compressor Lockout

5. Set thermostat at setting to call for heat.

7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure.

If any of the safeties (high-pressure, low-pressure, freeze
protection thermostat, compressor internal thermostat) trip,
or if there is loss of power to the compressors, the cooling
lockout (CLO) will lock the compressors off. To reset, manually move the thermostat setting.

8. Once desired pressure is established, set thermostat
setting for no call for heat, turn off main gas valve,
remove pressure-measuring device, and replace 1/8-in.
pipe plug and screw cap.

B. Evaporator Fan Motor Protection
On size 155 units, an internal protector with auto-reset is
included in the indoor fan motor as a protection against
overcurrent.

XI. MAIN BURNERS
For all applications, main burners are factory set and should
require no adjustment.

On size 180 and 240 units, a manual reset, calibrated trip,
magnetic circuit breaker protects against overcurrent. Do
not bypass connections or increase the size of the breaker to
correct trouble. Determine the cause and correct it before
resetting the breaker.

6. Remove screw cap covering regulator adjustment
screw (See Fig. 36).

A. Main Burner Removal
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Remove unit control box access panel, burner section
access panel, and center post (Fig. 4 and 5).
4. Disconnect gas piping from gas valve inlet.
5. Remove wires from gas valve.
6. Remove wires from rollout switch.
7. Remove sensor wire and ignitor cable from IGC
board.
8. Remove 2 screws securing manifold bracket to
basepan.

—29—

Fig. 36 — Gas Valve

C. Condenser-Fan Motor Protection
Each condenser-fan motor is internally protected against
overtemperature.
D. High- and Low-Pressure Switches
If either switch trips, or if the compressor overtemperature
switch activates, that refrigerant circuit will be automatically locked out by the CLO. To reset, manually move the
thermostat setting.
E. Freeze Protection Thermostat (FPT)
An FPT is located on the top and bottom of the evaporator
coil. They detect frost build-up and turn off the compressor,
allowing the coil to clear. Once the frost has melted, the compressor can be reenergized by resetting the compressor
lockout.

XIV. RELIEF DEVICES
All units have relief devices to protect against damage from
excessive pressures (i.e., fire). These devices protect the high
and low side.
XV. CONTROL CIRCUIT, 24-V
This control circuit is protected against overcurrent by a
3.2 amp circuit breaker. Breaker can be reset. If it trips,
determine cause of trouble before resetting
XVI. REPLACEMENT PARTS
A complete list of replacement parts may be obtained from
any Carrier distributor upon request.
XVII. DIAGNOSTIC LEDS
The IGC control board has a LED for diagnostic purposes.
The IGC error codes are shown in Table 15.

—30—

SEE
DETAIL
"C"

581A155225
SEE
DETAIL
"C"

581A180270, 581A240270, AND 581A155300

SEE
DETAIL
"C"

581A180360 AND 581A240360

Fig. 37 — Spark Gap Adjustment

—31—

LEGEND
Fig. 38 — Typical Wiring Schematic and Fig. 39 — Typical Component Arrangement

AHA
BKR W/AT
BR
C
CAP
CB
CC
CH
CLO
CLS
COMP
CR
CT
DM
DU
EQUIP
FPT
FU
GND
GVR
HPS
HS
HV
IDM

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

Adjustable Heat Anticipator
Breaks with Amp Turns
Burner Relay
Contactor, Compressor
Capacitor
Circuit Breaker
Cooling Compensator
Crankcase Heater
Compressor Lockout
Compressor Lockout Switch
Compressor Motor
Control Relay
Current Transformer
Damper Motor
Dummy Terminal
Equipment
Freeze Protection Thermostat
Fuse
Ground
Gas Valve Relay
High-Pressure Switch
Hall Effect Sensor
High Voltage
Induced-Draft Motor

IFC
IFCB

—
—

IFM
IGC
L
LED
LOR
LPS
LS
MAT
MGV
NEC
OAT
OFC
OFM
PL
QT
R
RS
SN
SW
TB
TRAN

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

Indoor (Evaporator) Fan Contactor
Indoor (Evaporator) Fan Circuit
Breaker
Indoor (Evaporator) Fan Motor
Integrated Gas Unit Controller
Light
Light-Emitting Diode
Lockout Relay
Low-Pressure Switch
Limit Switch
Mixed-Air Thermostat
Main Gas Valve
National Electrical Code
Outdoor-Air Thermostat
Outdoor (Condenser) Fan Contactor
Outdoor (Condenser) Fan Motor
Plug Assembly
Quadruple Terminal
Relay
Rollout Switch
Sensor
Switch
Terminal Block
Transformer

NOTES:
1. Compressor and fan motors thermally protected; 3-phase motors protected against primary single-phasing conditions.
2. If any of the original wire furnished must be replaced, it must be replaced with type 90 C
wire or its equivalent.
3. Jumpers are omitted when unit is equipped with economizer.
4. IFCB must trip amps is equal to or less than 140% full load amps.
5. On 208/230-v unit, TRAN1 is factory wired to ORN lead for 230-v power supply. If unit is
to run on 208-v power supply, TRAN1 must be rewired. Disconnect the BLK wire on
TRAN1 and connect wire to 208-v RED wire. Insulate 230-v ORN wire.
6. The CLO locks out the compressor to prevent short cycling on compressor overload
and safety devices. Before replacing CLO, check these devices.
7. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single-pole, double-throw contact. An underlined number signifies a normally
closed contact. A plain (no line) number signifies a normally open contact.

Fig. 38 — Typical Wiring Schematic (581A180, 208/230 V Shown)

—32—

Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Splice (Field Supplied)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To Indicate Common Potential Only,
Not To Represent Wiring

Fig. 38 — Typical Wiring Schematic (581A180, 208/230 V Unit Shown) (cont)

—33—

ECONOMIZER OPTION/ACCESSORY

Fig. 39 — Typical Component Arrangement (581A180 Shown)

—34—

TROUBLESHOOTING
Refer to Tables 18 and 19 for troubleshooting details.
Table 18 — Cooling Service Analysis
PROBLEM
Compressor and condenser fan will
not start.

Compressor will not start but
condenser fan runs.

CAUSE
Power failure.
Fuse blown or circuit breaker tripped.
Defective thermostat, contactor, transformer,
or control relay.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Faulty wiring or loose connections in
compressor circuit.
Compressor motor burned out, seized, or
internal overload open.
Defective overload.
Compressor locked out.
One leg of 3-phase power dead.

Compressor cycles (other than
normally satisfying thermostat).

Refrigerant overcharge or undercharge.

Defective compressor.
Insufficient line voltage.
Blocked condenser.
Defective overload.
Defective thermostat.
Faulty condenser-fan motor.
Restriction in refrigerant system.
Compressor operates continuously. Dirty air filter.
Unit undersized for load.
Thermostat set too low.
Low refrigerant charge.
Air in system.
Condenser coil dirty or restricted.
Dirty air filter.
Excessive head pressure.
Dirty condenser coil.
Refrigerant overcharged.
Faulty TXV.

Head pressure too low.
Excessive suction pressure.

Suction pressure too low.

Compressor no. 2 will not run.

Air in system.
Condenser air restricted or air short-cycling.
Low refrigerant charge.
Restriction in liquid tube.
High heat load.
Faulty TXV.
Refrigerant overcharged.
Dirty air filter.
Low refrigerant charge.
Metering device or low side restricted.
Faulty TXV.
Insufficient evaporator airflow.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
Unit in economizer mode.

LEGEND
TXV — Thermostatic Expansion Valve

—35—

REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room
temperature.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Determine cause for safety trip and reset
lockout.
Replace fuse or reset circuit breaker.
Determine cause.
Recover refrigerant, evacuate system, and recharge to
nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove.
Replace filter.
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair, and recharge.
Recover refrigerant, evacuate system, and recharge.
Clean coil or remove restriction.
Replace filter.
Clean coil.
Recover excess refrigerant.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Remove restriction.
Check for source and eliminate.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover excess refrigerant.
Replace filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Increase air quantity. Check filter and replace if necessary.
Reset thermostat.
Replace.
Proper operation; no remedy necessary.

Table 19 — Heating Service Analysis
PROBLEM
Burners will not ignite.

CAUSE
Misaligned spark electrodes.
No gas at main burners.

Water in gas line.
No power to furnace.
No 24 v power supply to control circuit.

Inadequate heating.

Miswired or loose connections.
Burned-out heat anticipator in thermostat.
Broken thermostat wires.
Dirty air filter.
Gas input to unit too low.
Unit undersized for application.
Restricted airflow.
Blower speed too low.
Limit switch cycles main burners.
Too much outdoor air.

Poor flame characteristics.

Incomplete combustion (lack of combustion air)
results in:
Aldehyde odors, CO, sooting flame, or floating
flame.

Burners will not turn off.

Unit is locked into Heating mode for a one minute
minimum.

LEGEND
GR — Ground

—36—

REMEDY
Check flame ignition and sensor electrode positioning. Adjust
as needed.
Check gas line for air; purge as necessary. After purging gas
line of air, allow gas to dissipate for at least 5 minutes before
attempting to relight unit.
Check gas valve.
Drain water and install drip leg to trap water.
Check power supply, fuses, wiring, and circuit breaker.
Check transformer. Transformers with internal overcurrent
protection require a cool-down period before resetting. Check
24-v circuit breaker; reset if necessary.
Check all wiring and wire nut connections.
Replace thermostat.
Run continuity check. Replace wires if necessary.
Clean or replace filter as necessary.
Check gas pressure at manifold. Clock gas meter for input.
If too low, increase manifold pressure or replace with correct
orifices.
Replace with proper unit or add additional unit.
Clean filter, replace filter, or remove any restrictions.
Install alternate motor, if applicable, or adjust pulley to increase
fan speed.
Check rotation of blower, thermostat heat anticipator settings,
and temperature rise of unit. Adjust as needed.
Adjust minimum position.
Check economizer operation.
Check all screws around flue outlets and burner compartment.
Tighten as necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust gas
line or manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Wait until mandatory one minute time period has elapsed or
power to unit.

Refer to Fig. 40 for IGC troubleshooting information.

LEGEND
IDM —
IGC —

Induced-Draft Motor
Integrated Gas Unit Controller

NOTE: Thermostat Fan Switch in the “AUTO” position.

Fig. 40 — IGC Control (Heating and Cooling)

—37—

PACKAGED SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including:
• Unit Familiarization

• Maintenance

• Installation Overview

• Operating Sequence

A large selection of product, theory, and skills programs are available, using popular video-based formats and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes “hands-on” experience with the products in our labs can
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks.
Course descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[

] Packaged Service Training

Copyright 1999 Bryant Heating & Cooling Systems

[

] Classroom Service Training

CATALOG NO. 5358-101

START-UP CHECKLIST
MODEL NO.:

SERIAL NO.:

DATE:

TECHNICIAN:

I. PRE-START-UP


 VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

 VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT (155) OR ADJUSTMENT BOLT AND PLATE

 OPEN LIQUID LINE SERVICE VALVE

 VERIFY INSTALLATION OF ECONOMIZER HOOD

 VERIFY INSTALLATION OF EXHAUST HOOD

 VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS

 VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT

 VERIFY GAS PRESSURE TO UNIT GAS VALVE IS WITHIN SPECIFIED RANGE

 CHECK GAS PIPING FOR LEAKS

 CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE

 CHECK THAT OUTDOOR AIR INLET SCREEN IS IN PLACE

 VERIFY THAT UNIT IS LEVEL

 CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREWIS TIGHT

 VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED

 VERIFY THAT SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION

 VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED 24 HOURS BEFORE START-UP

CUT ALONG DOTTED LINE

(180, 240 ONLY)

II. START-UP
L1-L2

L2-L3

L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1

L1

L2

L3

— COMPRESSOR NO. 2

L1

L2

L3

SUPPLY FAN AMPS

EXHAUST FAN AMPS

TEMPERATURES
OUTDOOR-AIR TEMPERATURE

F DB (Dry Bulb)

RETURN-AIR TEMPERATURE

F DB

COOLING SUPPLY AIR

F

GAS HEAT SUPPLY AIR

F

PRESSURES
GAS INLET PRESSURE

F WB (Wet Bulb)

CUT ALONG DOTTED LINE

ELECTRICAL
SUPPLY VOLTAGE

IN. WG

GAS MANIFOLD PRESSURE

STAGE NO. 1

IN. WG

STAGE NO. 2

REFRIGERANT SUCTION

CIRCUIT NO. 1

PSIG

CIRCUIT NO. 2

PSIG

REFRIGERANT DISCHARGE

CIRCUIT NO. 1

PSIG

CIRCUIT NO. 2

PSIG


 VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 29.

IN. WG

GENERAL
ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS




Copyright 1999 Bryant Heating & Cooling Systems

CL-1

CATALOG NO. 5358-101



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