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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Page Count: 40

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

START-UP CHECKLIST. . . . . . . . . . . . . . . . . . . . . . . .CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. 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.

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.)

WARNING: Before performing service or mainte-

nance operations on unit, turn off mail power switch to

unit. electrical shock could cause personal injury.

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.

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 field-

supplied gas piping at pressures of 0.5 psig or less, a

unit connected to such piping must be isolated by clos-

ing the manual gas valve(s).

installation, start-up and

service instructions

SINGLE PACKAGE ROOFTOP

ELECTRIC COOLING/GAS HEATING UNITS

581A

Sizes 155-240

—2—

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.

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)

UNIT AB

DEG.IN.DEG.IN.

ALL .28 .45 .28 .43

Fig. 1 — Roof Curb Details

PKG. NO. REF. CURB

HEIGHT

ft-in. (mm) DESCRIPTION

CRRFCURB010A00 1-2

(305) Standard Curb

14” High

CRRFCURB011A00 2-0

(610)

Standard Curb

for Units

Requiring High

Installation

CRRFCURB012A00 2-0

(610)

Side Supply

and Return

Curb for High

Installation

—3—

IMPORTANT: Curb or adapter roof curb must be level. This is

necessary to permit unit drain to function properly. Unit lev-

eling 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.

When accessory roof curb or horizontal supply roof curb is

used, unit may be installed on class A, B, or C roof covering

material.

IMPORTANT: The gasketing of the unit to the roof curb or

adapter roof curb is critical for a watertight seal. Install gas-

ket with the roof curb or adapter as shown in Fig. 1. Improp-

erly applied gasket can also result in air leaks and poor unit

performance.

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 refer-

ence; leveling tolerance is ± 1/16 in. per linear ft in any direc-

tion. 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.

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.

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 ven-

tilation 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).

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

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 build-

ing. When unit is located adjacent to public walkways, flue

assembly must be at least 7 ft above grade.

B. Roof Mount

Check building codes for weight distribution requirements.

Unit operating weight is shown in Table 1.

Instructions continued on page 8.

UNIT

581A

MAXIMUM SHIPPING

WEIGHT

DIMENSIONS

AB

lb kg ft-in. mm ft-in. mm

155 1725 782 6-111/22121 4-0 1219

180 1800 816 6-111/22121 3-2 964

240 1900 862 6-111/22121 3-4 1016

Fig. 3 — Rigging Details

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 econo-

mizer 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.

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.

Fig. 2 — Horizontal Adapter Roof Curbs

and Roof Curbs

—4—

581A180 ONLY

FIELD

SUPPLIED

POWER EXHAUST/

BAROMETRIC RELIEF

(ACCESSORY ONLY)

POWER EXHAUST/

BAROMETRIC RELIEF

(ACCESSORY ONLY)

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

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in millimeters.

3. Center of Gravity.

4. 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.

UNIT

581A

STD UNIT

WEIGHT

ECONO-

MIZER

WEIGHT

CORNER

ACORNER

BCORNER

CCORNER

DDIM A DIM B DIM C

Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-in. mm ft-in. mm

155 1725 782 110 50 427 194 390 177 438 199 470 213 3-3 991 3-5 1051 1-10 559

180 1800 816 110 50 417 189 399 181 481 218 503 228 3-2 961 3-6 1070 1-10 559

—5—

Fig. 5 — Base Unit Dimensions; 581A240

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in millimeters.

3. Center of Gravity.

4. 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.

UNIT STD. UNIT WEIGHT ECONOMIZER

WEIGHT

581A240 1900 lbs (862 kg) 110 lbs (50 kg)

—6—

Table 1 — Physical Data

LEGEND *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.

UNIT 581A 155 180 240

NOMINAL CAPACITY (tons) 12 15 20

OPERATING WEIGHT (lb)

Unit

Al/Al* 1725 1800 1900

Al/Cu* 1875 1950 2050

Cu/Cu* 2005 2080 2180

Economizer 110 110 110

Roof Curb† 200 200 200

COMPRESSOR

Quantity 22 2

Number of Refrigerant Circuits 22 2

Crankcase Heater Watts 70 70 70

Oil (oz) (Ckt 1, Ckt 2) 60,66 85,60 110,110

REFRIGERANT TYPE R-22

Expansion Device TXV

Operating Charge (lb oz)

Circuit 1** 20.7 19.5 18.5

Circuit 2 11.9 13.45 13.3

CONDENSER COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

Rows...Fins/in. 4...15 4...15 4...15

Total Face Area (sq ft) 21.7 21.7 21.7

CONDENSER FAN Propeller Type

Nominal Cfm 10,500 10,500 14,200

Quantity...Diameter (in.) 3...22 3...22 2...30

Motor Hp...Rpm 1/2...1050 1/2...1050 1...1075

Watts Input (Total) 1100 1100 3400

EVAPORATOR COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split

Rows...Fins/in. 4...15 4...15 4...15

Total Face Area (sq ft) 17.5 17.5 17.5

EVAPORATOR FAN Centrifugal Type

Quantity...Size (in.) 2...10 X 10 2...12 x 12 2...12 x 12

Type Drive Belt Belt Belt

Nominal Cfm 5200 6000 8000

Std Motor Hp 2.9 5 7.5

Opt Motor Hp 3.7

Motor Nominal Rpm 1725 1745 1745

Std Maximum Continuous Bhp 3.13 6.13 9.47 (208 v) 10.33

(230 and 460 v)

Opt Maximum Continuous Bhp 4.38

Motor Frame Size 56H 184T 213T

Fan Rpm Range Low-Medium Static 834-1064 873-1021 1002-1151

High Static 1161-1426 1025-1200 1193-1369

Motor Bearing Type Ball Ball Ball

Maximum Allowable Rpm 1550 1550 1550

Motor Pulley Pitch Dia. Low-Medium Static 3.1/4.1 4.9/5.9 5.4/6.6

High Static 3.7/4.7 4.9/5.9 5.4/6.6

Nominal Motor Shaft Diameter (in.) 7/811/813/8

Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 9.4 9.4

High Static 5.2 8.0 7.9

Nominal Fan Shaft Diameter (in.) 13/16 17/16 17/16

Belt, Quantity...Type... Length (in.) Low-Medium Static 1...BX...42 1...BX...50 1...BX...54

High Static 1...BX...42 1...BX...48 1...BX...50

Pulley Center Line Distance (in.) 13.5-15.5 13.3-14.8 14.6-15.4

Speed Change per Full Turn of

Movable Pulley Flange (Rpm) Low-Medium Static 58 37 37

High Static 67 44 44

Movable Pulley Maximum

Full Turns From Closed Position 4†† 4†† 4††

Factory Speed 3.5 3.5 3.5

Factory Speed Setting (Rpm) Low-Medium Static 978 965 1095

High Static 1327 1134 1303

FURNACE SECTION

Rollout Switch Cutout Temp (F) ll 190 190 190

Burner Orifice Diameter (in...drill size)

Natural Gas 0.1285...30/ 0.136...29 0.1285...30/ 0.136...29 0.1285...30/ 0.136...29

Thermostat Heat Anticipator Setting

Stage 1 (amps) 0.98 0.8 0.98 0.8 0.98 0.8

Stage 2 (amps) 0.44 0.44 0.44 0.44 0.44 0.44

Gas Input (Btuh) Stage 1 172,000/230,000 206,000/275,000 206,000/275,000

Stage 2 225,000/300,000 270,000/360,000 270,000/360,000

Efficiency (Steady State) (%) 81 81 81

Temperature Rise Range 15-45/30-60 15-45/20-50 15-45/20-50

Manifold Pressure (in. wg)

Natural Gas 3.3 3.3 3.3

Gas Valve Quantity 11 1

Gas Valve PressureRange(in.wg) 5.5-13.5 5.5-13.5 5.5-13.5

(psig) .235-.487 .235-.487 .235-.487

Field Gas Connection Size (in.-FPT) 3/43/43/4

HIGH-PRESSURE SWITCH (psig)

Cutout 426

Reset (Auto.) 320

LOW-PRESSURE SWITCH (psig)

Cutout 27

Reset (Auto.) 44

FREEZE PROTECTION THERMOSTAT (F)

Opens 30 ± 5

Closes 45 ± 5

OUTDOOR-AIR INLET SCREENS Cleanable

Quantity...Size (in.) 2...20 x 25 x 1

1...20 x 20 x 1

RETURN-AIR FILTERS Throwaway

Quantity...Size (in.) 4...20 x 20 x 2

4...16 x 20 x 2

Al — Aluminum

Bhp — Brake Horsepower

Cu — Copper

TXV — Thermostatic Expansion Valve

—7—

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 accor-

dance with the latest issue of SMACNA (Sheet Metal and Air

Conditioning Contractors National Association) and ACCA

(Air Conditioning Contractors of America) minimum instal-

lation standards for heating and air conditioning systems.

Ducts passing through an unconditioned space must be insu-

lated and covered with a vapor barrier.

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.

IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS

Unit is shipped for thru-the-bottom duct connections. Duct-

work openings are shown in Fig. 1, 4, and 5. Duct

connections are shown in Fig. 6. Field-fabricated concentric

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.

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.

NOTE: When properly installed, flue hood will line up with

combustion fan housing. See Fig. 10.

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.

WIND

BAFFLE

FLUE

SCREEN

INLET

LOUVERS

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

leak.

Fig. 6 — Air Distribution — Thru-the-Bottom

(581A180, 240 Unit Shown)

NOTE: Dimensions A, A’, B and

B’ are obtained from field-supplied ceiling diffuser.

Shaded areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

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

—8—

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

3/4 in. half coupling is provided inside unit evaporator section

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.

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 con-

form 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.

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.

When installing units, provide a disconnect per NEC

(National Electrical Code) requirements of adequate size

(Table 2).

All field wiring must comply with NEC and local require-

ments. Insulate low-voltage wires for highest voltage con-

tained within conduit when low-voltage control wires are run

in the same conduit as high-voltage wires.

WARNING: Do not pressure test gas supply while

connected to unit. Always disconnect union before

servicing.

INDUCED DRAFT

MOTOR

MAIN BURNER

SECTION

COMBUSTION

FAN HOUSING HEAT EXCHANGER

SECTION

Fig. 10 — Combustion Fan Housing Location

3/4" FPT DRAIN

CONNECTION 1-3/8"

DRAIN HOLE

INDOOR MOTOR ACCESS

FILTER

ACCESS

Fig. 11 — Condensate Drain Details

(581A155 Shown)

Fig. 12 — Condensate Drain Piping Details

Fig. 13 — Field Gas Piping

—9—

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.

Field wiring must conform to temperature limitations for

type “T” wire. All field wiring must comply with NEC and

local requirements.

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.

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, volt-

ages 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 field-

supplied, 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.

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.

Route thermostat cable or equivalent single leads of colored

wire from subbase terminals through conduit in unit to low-

voltage connections as shown on unit label wiring diagram

and in Fig. 15.

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).

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:

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 pro-

vide 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 maxi-

mum 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.

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 compres-

sor failure.

WARNING: The unit must be electrically grounded

in accordance with local codes and NEC ANSI/NFPA

70 (National Fire Protection Association).

VOLTAGE W1 W2

208/230 0.98 0.44

460 0.80 0.44

NOTE: The maximum wire size for TB1 is 2/0.

LEGEND

Fig. 14 — Field Power Wiring Connections

EQUIP — Equipment

GND — Ground

NEC — National Electrical Code

TB — Terminal Board Fig. 15 — Field Control Thermostat Wiring

—10—

Table 2 — Electrical Data

LEGEND

*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.

% Voltage Imbalance

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

= 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.

= 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.

UNIT

581A

NOMINAL

VOLTAGE

(3 Ph, 60

Hz)

VOLTAGE

RANGE COMPRESSOR OFM IFM POWER

EXHAUST COMBUSTION

FAN MOTOR POWER

SUPPLY

No. 1 No. 2

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP*

015

(Standard

IFM)

208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 2.9

8.8/

8.4 —

4.6 —

18.8 0.57

0.57 59/59

64/63 70/70

80/80

460 414 508 10 70 10 62 3 0.5 0.8 2.9 4.2 —

2.3 —

6.0 0.30

0.30 29

31 35

40

015

(Optional

IFM)

208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 3.7 11.0/

10.5 —

4.6 —

18.8 0.57

0.57 61/61

66/65 80/80

80/80

460 414 508 10 70 10 62 3 0.5 0.8 3.7 4.8 —

2.3 —

6.0 0.30

0.30 30

32 35

40

017 208/230 187 253 32.1 195 20.7 156 3 0.5 1.7 5.0 15.8/

15.8 —

4.6 —

18.8 0.57

0.57 82/82

86/86 110/110

110/110

460 414 508 16.4 95 10 70 3 0.5 0.8 5.0 7.9 —

2.3 —

6.0 0.30

0.30 41

43 50

50

025 208/230 187 253 42 239 33.6 225 2 1 6.6 7.5 25.0/

25.0 —

4.6 —

18.8 0.57

0.57 124/124

129/129 150/150

150/150

460 414 508 19.2 125 17.3 114 2 1 3.3 7.5 13.0 —

2.3 —

6.0 0.30

0.30 61

63 80

80

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

= 100 x max voltage deviation from average voltage

average voltage

Average Voltage = 452 + 464 + 455

3

= 1371

3

% Voltage Imbalance = 100 x 7

457

—11—

Damper Vent Position Setting

1. Set fan switch at ON position (continuous fan opera-

tion) 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 econo-

mizer 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.

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).

Fig. 16 — 25% Outdoor-Air Section Details

Fig. 17 — Economizer Damper Assembly-End View

LEGEND

Fig. 18 — Economizer Motor Control Module

(Part Number W7459A)

LED — Light-Emitting Diode

Fig. 19 — Economizer Motor Control

Module Location

Fig. 20 — Outdoor-Air Hood Component Location

—12—

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.

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

retainer and tighten screws.

5. Loosen sheet metal screws for top panel of base unit-

located above outdoor-air inlet opening, and remove

screws for hood side panels located on the sides of the

outdoor-air inlet opening.

6. Match notches in hood top panel with unit top panel

screws. Insert hood flange between top panel flange

and unit. Tighten screws.

7. Hold hood side panel flanges flat against unit, and

install screws removed in Step 5.

8. Insert outdoor-air inlet screens and spacer in channel

created by lower filter retainer and filter support

bracket.

9. Attach remaining short section of filter support

bracket.

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.

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.

2. Remove black wire assembly containing the 620-ohm

resistor from between economizer control module ter-

minal 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 econo-

mizer 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 +.

7. Cut the violet wire provided to desired length and

terminate with quick-connect terminal provided.

Route the violet wire from the enthalpy sensor termi-

nal S, through the snap bushing, and to the econo-

mizer control module terminal SO. See Fig. 18.

8. Set changeover set point to the desired location. See

Fig. 24.

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

UPPER FILTER RETAINER

BAFFLE (180 AND 240 SIZES ONLY)

LOWER FILTER

RETAINER

FILTER SUPPORT

BRACKET

Fig. 21 — Seal Strip Location

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

Fig. 23 — Outdoor-Air and Return-Air

Enthalpy Sensor

—13—

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.

2. Disconnect black wire from economizer control mod-

ule terminal SO and blue wire from the OAT (outdoor-

air 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 termi-

nal S, through the snap bushing, and to the econo-

mizer 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 con-

trol module terminal SR.

10. Turn changeover set point dial clockwise past the “D”

setting, or the control will not operate on a differen-

tial. See Fig. 18.

11. Reinstall economizer hood if removed.

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.

Install Motormaster I Controls

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 out-

door 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.

CAUTION: To avoid damage to the refrigerant coils

and electrical components, use recommended screw

sizes only. Use care when drilling holes.

Fig. 24 — Psychrometric Chart for Solid-State

Enthalpy Control

RH — Relative Humidity

NOTE: Dimensions in ( ) are in mm.

Fig. 25 — Wind Baffle Details

CONTROL

CURVE

CONTROL

POINT

(Approx Deg)

AT 50% RH

A

B

C

D

73

68

63

58

—14—

Sensor Assembly — Install the sensor assembly in the loca-

tion 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 trans-

former 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, verti-

cally, 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 Motor-

master 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 sep-

arates 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

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 ser-

vice 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 compres-

sors are rotating in the proper direction:

1. Connect service gages to suction and discharge pres-

sure 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 pres-

sure does not rise to normal levels:

1. Note that the evaporator fan is probably also rotating

in the wrong direction.

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.

CAUTION: To avoid damage to the refrigerant

coils and electrical components, use recommended

screw sizes only. Use care when drilling holes.

MOTORMASTER

SENSOR

LOCATION

HAIRPIN END

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

—15—

NOTE: When compressors are rotating in the wrong direc-

tion, the unit will have increased noise levels and will not

provide heating and cooling.

After a few minutes of reverse operation, the scroll compres-

sor internal overload protection will open, which will acti-

vate the unit’s lockout and requires a manual reset. Reset is

accomplished by turning the thermostat on and off.

VI. INTERNAL WIRING

Check all electrical connections in unit control boxes; tighten

as required.

VII. CRANKCASE HEATER(S)

Crankcase heater(s) is energized as long as there is power to

the unit and the compressor is not operating.

IMPORTANT: Unit power must be on for 24 hours prior to

start-up. Otherwise, damage to compressor may result.

VIII. EVAPORATOR FAN

Fan belt and variable pulleys are factory-installed. Remove

tape from the fan pulley. See Tables 3-10 for Fan Perfor-

mance Data. Be sure that fans rotate in the proper direction.

See Table 11 for air quantity limits. See Table 12 for Evapo-

rator Fan Motor Specifications. See Table 13 for static pres-

sure information for accessories and options. See Table 14 for

fan rpm at various motor pulley settings. To alter fan perfor-

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.

IX. CONDENSER FANS AND MOTORS

Condenser fans and motors are factory set. Refer to Con-

denser-Fan Adjustment section (page 27) as required. Be

sure that fans rotate in the proper direction.

X. RETURN-AIR FILTERS

Check that correct filters are installed in filter tracks (see

Table 1). Do not operate unit without return-air filters.

XI. OUTDOOR-AIR INLET SCREENS

Outdoor-air inlet screens must be in place before operating

unit.

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)

LEGEND

*Standard low-medium static drive range is 834 to 1064 rpm. Alternate

high-static drive range is 1161 to 1426. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the standard motor is 3.13. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.20.40.60.81.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 753 915 1.05 838 1066 1.23 945 1278 1.47 1044 1500 1.73 1138 1731 1.99

4000 755 991 1.14 865 1198 1.38 968 1414 1.63 1063 1639 1.89 1154 1873 2.15

4250 788 1129 1.30 894 1341 1.54 992 1562 1.80 1084 1791 2.06 1172 2029 2.33

4500 822 1280 1.47 923 1497 1.72 1017 1722 1.98 1106 1956 2.25 1191 2196 2.53

4750 857 1443 1.66 953 1666 1.92 1044 1896 2.18 1130 2133 2.45 1212 2377 2.73

5000 891 1620 1.86 984 1847 2.12 1071 2082 2.39 1154 2323 2.67 1234 2572 2.96

5250 927 1810 2.08 1015 2043 2.35 1099 2282 2.62 1180 2528 2.91 — — —

5500 962 2014 2.32 1047 2252 2.59 1129 2496 2.87 — — — — — —

5750 998 2233 2.57 1080 2476 2.85 — — — — — — — — —

6000 1035 2466 2.84 — — — — — — — — — — — —

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.21.41.61.82.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 1226 1971 2.27 1311 2218 2.55 1391 2474 2.85 ——————

4000 1240 2116 2.43 1322 2366 2.72 1401 2623 3.02 — — — — — —

4250 1255 2274 2.61 1335 2526 2.91 — — — — — — — — —

4500 1272 2444 2.81 1350 2700 3.10 — — — — — — — — —

4750 1291 2628 3.02 — — — — — — — — — — — —

5000 ———————————————

5250 ———————————————

5500 ———————————————

5750 ———————————————

6000 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—16—

Table 4 — Fan Performance — 581A155225 (Low Heat Units with Optional Indoor Fan Motor)

LEGEND

*Standard low-medium static drive range is 834 to 1064 rpm. Alternate

high-static drive range is 1161 to 1426. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the optional motor is 4.38. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.20.40.60.81.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 753 942 1.08 838 1091 1.25 945 1298 1.49 1044 1513 1.74 1138 1737 2.00

4000 755 1020 1.17 865 1223 1.41 968 1433 1.65 1063 1652 1.90 1154 1878 2.16

4250 788 1159 1.33 894 1366 1.57 992 1581 1.82 1084 1803 2.07 1172 2032 2.34

4500 822 1311 1.51 923 1522 1.75 1017 1740 2.00 1106 1966 2.26 1191 2197 2.53

4750 857 1474 1.70 953 1690 1.94 1044 1912 2.20 1130 2141 2.46 1212 2376 2.73

5000 891 1650 1.90 984 1871 2.15 1071 2097 2.41 1154 2329 2.68 1234 2567 2.95

5250 927 1840 2.12 1015 2065 2.37 1099 2295 2.64 1180 2530 2.91 1257 2771 3.19

5500 962 2042 2.35 1047 2272 2.61 1129 2506 2.88 1207 2745 3.16 1281 2989 3.44

5750 998 2259 2.60 1080 2492 2.87 1159 2730 3.14 1234 2973 3.42 1307 3221 3.70

6000 1035 2489 2.86 1114 2727 3.14 1189 2969 3.41 1262 3215 3.70 1333 3466 3.99

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.21.41.61.82.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 1226 1968 2.26 1311 2206 2.54 1391 2451 2.82 1468 2702 3.11 1543 2959 3.40

4000 1240 2111 2.43 1322 2351 2.70 1401 2598 2.99 1476 2850 3.28 1549 3108 3.57

4250 1255 2267 2.61 1335 2509 2.89 1412 2757 3.17 1486 3011 3.46 — — —

4500 1272 2436 2.80 1350 2680 3.08 1425 2929 3.37 1497 3185 3.66 — — —

4750 1291 2616 3.01 1366 2863 3.29 1440 3115 3.58 1510 3372 3.88 — — —

5000 1310 2810 3.23 1384 3059 3.52 1456 3314 3.81 1525 3573 4.11 — — —

5250 1332 3018 3.47 1403 3269 3.76 1473 3526 4.05 — — — — — —

5500 1354 3238 3.72 1424 3492 4.02 1491 3751 4.31 — — — — — —

5750 1377 3473 3.99 1445 3730 4.29 — — — — — — — — —

6000 1401 3722 4.28 — — — — — — — — — — — —

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—17—

Table 5 — Fan Performance — 581A180270 (Low Heat Units)

LEGEND

*Standard low-medium static drive range is 873 to 1021 rpm. Alternate

high-static drive range is 1025 to 1200. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the standard motor is 6.13. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 753 1307 1.53 761 1330 1.56 840 1572 1.84 912 1822 2.14 980 2080 2.44

4800 747 1384 1.62 790 1515 1.78 866 1765 2.07 936 2023 2.37 1002 2289 2.68

5100 741 1465 1.72 820 1718 2.01 893 1977 2.32 961 2243 2.63 1025 2516 2.95

5700 810 1911 2.24 882 2182 2.56 950 2459 2.88 1014 2741 3.21 1075 3029 3.55

6000 844 2164 2.54 914 2444 2.87 980 2730 3.20 1042 3021 3.54 1100 3317 3.89

6300 879 2439 2.86 947 2729 3.20 1010 3023 3.55 1070 3322 3.90 1127 3626 4.25

6600 915 2737 3.21 980 3035 3.56 1041 3338 3.91 1099 3645 4.28 1155 3957 4.64

6900 950 3057 3.59 1013 3364 3.95 1072 3675 4.31 1129 3991 4.68 1183 4311 5.06

7200 986 3401 3.99 1047 3717 4.36 1104 4037 4.74 1159 4361 5.11 1211 4689 5.50

7500 1022 3770 4.42 1081 4095 4.80 1136 4423 5.19 1189 4755 5.58 1241 5091 5.97

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1044 2345 2.75 1105 2619 3.07 1163 2899 3.40 1218 3187 3.74 1271 3481 4.08

4800 1065 2561 3.00 1124 2841 3.33 1180 3127 3.67 1235 3420 4.01 1287 3720 4.36

5100 1086 2795 3.28 1144 3082 3.61 1199 3375 3.96 1252 3674 4.31 1304 3979 4.67

5700 1132 3324 3.90 1187 3624 4.25 1240 3929 4.61 1291 4241 4.97 1341 4558 5.35

6000 1157 3619 4.24 1210 3925 4.60 1262 4239 4.97 1312 4557 5.34 1361 4880 5.72

6300 1182 3935 4.62 1234 4249 4.98 1285 4569 5.36 1334 4894 5.74 — — —

6600 1208 4274 5.01 1259 4595 5.39 1309 4922 5.77 — — — — — —

6900 1235 4636 5.44 1285 4964 5.82 — — — — — — — — —

7200 1262 5021 5.82 — — — — — — — — — — — —

7500 — — —— — —— — —— — —— — —

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.22.42.62.83.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1322 3781 4.43 1372 4088 4.79 1419 4400 5.16 1466 4719 5.53 1511 5042 5.91

4800 1337 4025 4.72 1386 4337 5.09 1433 4655 5.46 1479 4978 5.84 — — —

5100 1353 4290 5.03 1401 4607 5.40 1448 4930 5.78 — — — — — —

5700 1388 4881 5.72 — — — — — — — — — — — —

6000 ———————————————

6300 ———————————————

6600 ———————————————

6900 ———————————————

7200 ———————————————

7500 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—18—

Table 6 — Fan Performance — 581A240270 (Low Heat Units)

LEGEND

*Standard low-medium static drive range is 1002 to 1151 rpm. Alternate

high-static drive range is 1193 to 1369. Other rpms require a field-

supplied 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.

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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 824 2607 3.09 894 2844 3.37 961 3085 3.66 1023 3330 3.95 1083 3578 4.24

6,500 881 3030 3.59 947 3266 3.88 1009 3507 4.16 1069 3751 4.45 1126 3998 4.74

7,000 939 3488 4.14 1001 3725 4.42 1060 3965 4.70 1116 4208 4.99 1170 4454 5.28

7,500 998 3982 4.72 1055 4218 5.00 1111 4458 5.29 1165 4701 5.58 1217 4946 5.87

8,000 1056 4512 5.35 1111 4748 5.63 1164 4988 5.92 1215 5230 6.20 1264 5474 6.49

8,500 1116 5077 6.02 1167 5314 6.30 1218 5553 6.59 1266 5795 6.87 1314 6039 7.16

9,000 1175 5678 6.74 1224 5915 7.02 1272 6154 7.30 1319 6395 7.59 1364 6639 7.88

9,500 1235 6315 7.49 1282 6552 7.77 1327 6791 8.06 1372 7033 8.34 1415 7276 8.63

10,000 1295 6988 8.29 1340 7225 8.57 1383 7465 8.86 1426 7706 9.14 1468 7949 9.43

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1141 3829 4.54 1196 4082 4.84 1249 4337 5.15 1301 4596 5.45 1351 4856 5.76

6,500 1181 4247 5.04 1234 4499 5.34 1285 4753 5.64 1334 5009 5.94 1383 5267 6.25

7,000 1223 4702 5.58 1274 4953 5.88 1323 5205 6.18 1371 5460 6.48 1417 5716 6.78

7,500 1267 5194 6.16 1316 5443 6.46 1363 5694 6.76 1409 5947 7.06 1454 6202 7.36

8,000 1313 5721 6.79 1359 5970 7.08 1405 6220 7.38 1449 6472 7.68 1493 6726 7.98

8,500 1360 6285 7.46 1405 6533 7.75 1449 6783 8.05 1491 7034 8.34 1533 7286 8.64

9,000 1408 6885 8.17 1451 7132 8.46 1494 7381 8.76 1535 7631 9.05 — — —

9,500 1458 7521 8.92 1499 7768 9.22 1540 8016 9.51 — — — — — —

10,000 1508 8193 9.72 1549 8440 10.01 — — — — — — — — —

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1399 5118 6.07 1446 5381 6.38 1492 5647 6.70 1537 5914 7.02 — — —

6,500 1429 5527 6.56 1475 5789 6.87 1520 6052 7.18 — — — — — —

7,000 1462 5974 7.09 1507 6234 7.40 1550 6495 7.71 — — — — — —

7,500 1498 6459 7.66 1540 6717 7.97 — — — — — — — — —

8,000 1535 6981 8.28 — — — — — — — — — — — —

8,500 ———————————————

9,000 ———————————————

9,500 ———————————————

10,000 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—19—

Table 7 — Fan Performance — 581A155300 (High Heat Units with Standard Indoor Fan Motor

LEGEND

*Standard low-medium static drive range is 834 to 1064 rpm. Alternate

high-static drive range is 1161 to 1426. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the standard motor is 3.13. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 753 915 1.05 844 1077 1.24 949 1287 1.48 1047 1507 1.73 1139 1735 2.00

4000 764 1006 1.16 872 1211 1.39 972 1425 1.64 1067 1648 1.90 1156 1880 2.16

4250 798 1147 1.32 901 1357 1.56 997 1576 1.81 1089 1803 2.07 1175 2038 2.34

4500 832 1301 1.50 931 1516 1.74 1024 1739 2.00 1112 1970 2.27 1195 2209 2.54

4750 868 1467 1.69 962 1688 1.94 1051 1916 2.20 1136 2151 2.47 1217 2393 2.75

5000 903 1648 1.89 994 1873 2.15 1079 2106 2.42 1161 2345 2.70 1240 2590 2.98

5250 939 1842 2.12 1026 2073 2.38 1109 2309 2.66 1188 2553 2.9 — — —

5500 976 2050 2.36 1059 2286 2.63 1139 2528 2.91 — — — — — —

5750 1012 2273 2.61 1093 2514 2.89 — — — — — — — — —

6000 1049 2511 2.89 — — — — — — — — — — — —

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.21.41.61.82.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 1227 1973 2.27 1310 2218 2.55 1390 2471 2.84 ———

———

4000 1241 2120 2.44 1323 2368 2.72 1400 2623 3.02 — — — — — —

4250 1258 2281 2.62 1337 2531 2.91 — — — — — — — — —

4500 1275 2454 2.82 — — — — — — — — — — — —

4750 1295 2642 3.04 — — — — — — — — — — — —

5000 ———————————————

5250 ———————————————

5500 ———————————————

5750 ———————————————

6000 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—20—

Table 8 — Fan Performance — 581A155300 (High Heat Units with Optional Indoor Fan Motor)

LEGEND

*Standard low-medium static drive range is 834 to 1064 rpm. Alternate

high-static drive range is 1161 to 1426. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the optional motor is 4.38. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.20.40.60.81.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 753 942 1.08 844 1101 1.27 949 1306 1.50 1047 1520 1.75 1139 1741 2.00

4000 764 1035 1.19 872 1236 1.42 972 1444 1.66 1067 1661 1.91 1156 1885 2.17

4250 798 1177 1.35 901 1382 1.59 997 1594 1.83 1089 1814 2.09 1175 2041 2.35

4500 832 1331 1.53 931 1540 1.77 1024 1757 2.02 1112 1980 2.28 1195 2209 2.54

4750 868 1498 1.72 962 1711 1.97 1051 1932 2.22 1136 2158 2.48 1217 2390 2.75

5000 903 1677 1.93 994 1896 2.18 1079 2120 2.44 1161 2350 2.70 1240 2585 2.97

5250 939 1871 2.15 1026 2093 2.41 1109 2321 2.67 1188 2554 2.94 1264 2793 3.21

5500 976 2077 2.39 1059 2304 2.65 1139 2536 2.92 1215 2773 3.19 1289 3015 3.47

5750 1012 2298 2.64 1093 2529 2.91 1170 2765 3.18 1244 3005 3.46 1315 3250 3.74

6000 1049 2533 2.91 1127 2768 3.18 1201 3008 3.46 1273 3252 3.74 1342 3500 4.03

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.21.41.61.82.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

3750 1227 1970 2.27 1310 2206 2.54 1390 2448 2.82 1467 2696 3.10 1541 2951 3.39

4000 1241 2116 2.43 1323 2353 2.71 1400 2597 2.99 1475 2847 3.27 1548 3102 3.57

4250 1258 2274 2.62 1337 2513 2.89 1413 2759 3.17 1486 3010 3.46 — — —

4500 1275 2445 2.81 1352 2687 3.09 1426 2934 3.37 1498 3187 3.67 — — —

4750 1295 2629 3.02 1369 2873 3.30 1442 3122 3.59 1511 3377 3.88 — — —

5000 1315 2826 3.25 1388 3073 3.53 1458 3324 3.82 1527 3581 4.12 — — —

5250 1337 3037 3.49 1408 3286 3.78 1477 3540 4.07 — — — — — —

5500 1360 3262 3.75 1429 3513 4.04 1496 3769 4.34 — — — — — —

5750 1384 3500 4.03 1452 3755 4.32 — — — — — — — — —

6000 1410 3753 4.32 — — — — — — — — — — — —

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—21—

Table 9 — Fan Performance — 581A180360 (High Heat Units)

LEGEND

*Standard low-medium static drive range is 873 to 1021 rpm. Alternate

high-static drive range is 1025 to 1200. Other rpms require a field-

supplied drive.

NOTES:

1. Maximum continuous bhp for the standard motor is 6.13. The maxi-

mum 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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2040.60.81.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 753 1307 1.53 786 1404 1.65 861 1644 1.93 932 1893 2.22 997 2150 2.52

4800 747 1384 1.62 818 1603 1.88 890 1852 2.17 958 2108 2.47 1022 2373 2.78

5100 775 1571 1.84 850 1822 2.14 920 2079 2.44 986 2344 2.75 1048 2616 3.07

5700 849 2054 2.41 918 2323 2.73 982 2598 3.05 1044 2879 3.38 1102 3166 3.71

6000 886 2329 2.73 952 2607 3.06 1015 2891 3.39 1074 3180 3.73 1130 3474 4.08

6300 924 2628 3.08 987 2915 3.42 1047 3207 3.76 1105 3504 4.11 1160 3807 4.46

6600 962 2951 3.46 1023 3246 3.81 1081 3547 4.16 1136 3853 4.52 1190 4163 4.88

6900 1000 3298 3.87 1059 3603 4.23 1115 3912 4.59 1168 4225 4.96 1220 4543 5.33

7200 1038 3672 4.31 1095 3986 4.67 1149 4303 5.05 1201 4625 5.42 1251 4950 5.81

7500 1077 4072 4.78 1131 4394 5.15 1184 4720 5.54 1234 5050 5.92 — — —

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.21.41.61.82.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1060 2414 2.83 1119 2685 3.15 1175 2964 3.48 1230 3250 3.81 1282 3542 4.15

4800 1082 2644 3.10 1140 2922 3.43 1195 3207 3.76 1248 3498 4.10 1299 3795 4.45

5100 1106 2894 3.39 1163 3178 3.73 1216 3470 4.07 1268 3767 4.42 1319 4071 4.77

5700 1157 3459 4.06 1211 3757 4.41 1262 4061 4.76 1312 4371 5.13 1360 4686 5.50

6000 1184 3774 4.43 1236 4080 4.79 1287 4391 5.15 1335 4707 5.52 1382 5029 5.90

6300 1212 4114 4.83 1263 4427 5.19 1312 4745 5.57 1359 5067 5.94 — — —

6600 1241 4478 5.25 1290 4798 5.63 1338 5122 6.01 — — — — — —

6900 1270 4866 5.71 — — — — — — — — — — — —

7200 ———————————————

7500 ———————————————

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.22.42.62.83.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1332 3841 4.50 1381 4145 4.86 1428 4456 5.23 1473 4772 5.60 1518 5095 5.98

4800 1349 4100 4.81 1397 4409 5.17 1443 4725 5.54 1488 5046 5.92 — — —

5100 1367 4380 5.14 1414 4695 5.51 1460 5016 5.88 — — — — — —

5700 1407 5007 5.87 — — — — — — — — — — — —

6000 ———————————————

6300 ———————————————

6600 ———————————————

6900 ———————————————

7200 ———————————————

7500 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—22—

Table 10 — Fan Performance — 581A240360 (High Heat Units)

LEGEND

*Standard low-medium static drive range is 1002 to 1151 rpm. Alternate

high-static drive range is 1193 to 1369. Other rpms require a field-

supplied 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.

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.

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 868 2752 3.26 934 2987 3.54 997 3227 3.83 1058 3470 4.12 1115 3716 4.41

6,500 929 3201 3.80 991 3436 4.08 1051 3675 4.36 1108 3917 4.65 1162 4163 4.94

7,000 991 3687 4.37 1049 3923 4.65 1105 4161 4.94 1159 4403 5.22 1211 4647 5.51

7,500 1054 4211 5.00 1109 4447 5.28 1161 4686 5.56 1213 4926 5.84 1262 5170 6.13

8,000 1117 4773 5.66 1168 5009 5.94 1218 5247 6.22 1267 5488 6.51 1314 5731 6.80

8,500 1180 5373 6.37 1229 5609 6.65 1277 5847 6.94 1323 6088 7.22 1368 6331 7.51

9,000 1244 6011 7.13 1290 6247 7.41 1335 6485 7.69 1380 6726 7.98 1423 6968 8.27

9,500 1308 6687 7.93 1352 6924 8.21 1395 7162 8.50 1437 7402 8.78 1479 7644 9.07

10,000 1372 7401 8.78 1414 7638 9.06 1455 7876 9.34 1496 8117 9.63 1535 8358 9.92

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1171 3965 4.70 1224 4216 5.00 1276 4469 5.30 1326 4726 5.61 1374 4983 5.91

6,500 1215 4410 5.23 1266 4659 5.53 1316 4911 5.83 1364 5165 6.13 1411 5421 6.43

7,000 1262 4894 5.81 1311 5142 6.10 1358 5392 6.40 1404 5645 6.70 1449 5899 7.00

7,500 1310 5415 6.42 1357 5663 6.72 1403 5912 7.01 1447 6164 7.31 1490 6416 7.61

8,000 1360 5976 7.09 1405 6222 7.38 1449 6471 7.68 1492 6721 7.97 1533 6973 8.27

8,500 1412 6575 7.80 1455 6821 8.09 1497 7068 8.39 1538 7318 8.68 — — —

9,000 1465 7212 8.56 1506 7457 8.85 1547 7705 9.14 — — — — — —

9,500 151978889.36————————————

10,000 ———————————————

CFM AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1422 5243 6.22 1468 5505 6.53 1513 5768 6.84 ——————

6,500 1456 5679 6.74 1501 5938 7.04 1544 6199 7.35 — — — — — —

7,000 1493 6155 7.30 1536 6412 7.61 — — — — — — — — —

7,500 1533 6670 7.91 — — — — — — — — — — — —

8,000 ———————————————

8,500 ———————————————

9,000 ———————————————

9,500 ———————————————

10,000 ———————————————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

—23—

Table 11 — Air Quantity Limits

Table 12 — Evaporator Fan Motor Specifications

BHP — Brake Horsepower

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

LEGEND 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 con-

junction with the Fan Performance table to determine blower rpm,

bhp, and watts.

Table 14 — Fan RPM at Motor Pulley Setting*

*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.

UNIT

581A MINIMUM

CFM MAXIMUM

CFM

155 3600 6,000

180 4500 7,500

240 6000 10,000

UNIT

581A NOMINAL

Hp VOLTAGE MAX

WATTS EFF. MAX

BHP MAX

BkW MAX

AMPS

155

(Standard

Motor)

2.9 208 2700 85.8% 3.13 2.34 9.46

2.9 230 2700 85.8% 3.13 2.34 8.6

2.9 460 2700 85.8% 3.13 2.34 4.3

155

(Optional

Motor)

3.7 208 3775 85.8% 4.38 3.27 10.5

3.7 230 3775 85.8% 4.38 3.27 10.5

3.7 460 3775 85.8% 4.38 3.27 4.8

180 5 208 5180 87.5% 6.13 4.57 15.8

5 230 5180 87.5% 6.13 4.57 15.8

5 460 5180 87.5% 6.13 4.57 7.9

240 7.5 208 7915 88.5% 9.47 7.06 22

7.5 230 8640 88.5% 10.33 7.71 22

7.5 460 8640 88.5% 10.33 7.71 13

UNIT

581A UNIT

VOLTAGE CFM ECONOMIZER

PRESSURE DROP

155, 180 All

3,750 .03

4,000 .03

5,000 .05

6,000 .07

7,500 .10

240 All

6,000 .07

7,200 .09

9,000 .11

10,000 .12

bhp — Brake Horsepower

FIOP — Factory-Installed Option

581A 0 1/211

1

/

222

1

/

233

1

/

244

1

/

255

1

/

26

155† †† †† †† †† 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

—24—

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.

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) and-

compressor contactor no. 1 (C1) are energized and evapora-

tor-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 ener-

gized and compressor no. 2 starts.

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 min-

utes have elapsed, if the burners still have not lighted, heat-

ing is locked out. To reset the control, break 24-v power to

the thermostat.

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 posi-

tion). 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 heat-

ing will continue. Once modified, the fan on delay will not

change back to 45 seconds unless power is reset to the

control.

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 damp-

ers 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 modi-

fied, 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 opera-

tion. 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

LEGEND

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 con-

denser fans energize and operate as per Cooling, Units With-

out 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.

ERROR CODE LED INDICATION

Normal Operation On

HardwareFailure Off

Fan On/Off Delay

Modified 1 Flash

Limit Switch Fault 2 Flashes

Flame Sense Fault 3 Flashes

Five Consecutive Limit

Switch Faults 4 Flashes

Ignition Lockout Fault 5 Flashes

Inducer Switch Fault 6 Flashes

Rollout Switch Fault 7 Flashes

Internal Control Fault 8 Flashes

IGC — Integrated Gas Unit Controller

LED — Light-Emitting Diode

Fig. 27 — Fan Performance Using Accessory

Power Exhaust

—25—

Upon a second-stage call for cooling, compressor no. 1 is

energized and mechanical cooling is integrated with econo-

mizer 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 tempera-

ture at the fixed set point.

D. Freeze Protection Thermostats

A freeze protection thermostat is located on the top and bot-

tom 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 evapora-

tor fan is operating. Refer to Heating, Units without Econo-

mizer section on page 24 for heating sequence of operation.

SERVICE

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 win-

ter, keep drains and traps dry.

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.

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.

F. Main Burner

At the beginning of each heating season, inspect for deterio-

ration 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 baf-

fles and clean tubes with a wire brush.

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 effi-

ciency. Inspect blower wheel every fall and periodically dur-

ing 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 com-

bustion 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 sol-

vent. Replace motor and wheel assembly.

WARNING: Before performing service or mainte-

nance operations on unit, turn off main power switch

to unit. Electrical shock could cause personal injury.

INDUCED DRAFT

MOTOR

FLUE BOX

COVER

MAIN BURNER

SECTION MAIN GAS

VALVE

COMBUSTION

FAN HOUSING

INTEGRATED GAS

UNIT CONTROLLER

(HIDDEN)

CONTROL BOX

ACCESS PANEL

IGC LED

VIEW

PORT

FIELD GAS

CONNECTION

CERAMIC

BAFFLE

CLIP

HEAT EXCHANGER

TUBES

Fig. 28 — Typical Gas Heating Section

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

exchanger.

Fig. 29 — Removing Heat Exchanger Ceramic Baffles

and Clips

—26—

II. LUBRICATION

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 name-

plate for original oil charge. A complete recharge should be

four ounces less than the original oil charge When a com-

pressor 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.

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:

*Preferred lubricant because it contains rust and oxidation inhibitors.

C. Condenser and Evaporator-Fan Motor Bearings

The condenser- and evaporator-fan motors have

permanently sealed bearings, so no field lubrication is

necessary.

III. EVAPORATOR FAN PERFORMANCE ADJUSTMENT

(Fig. 30-32)

Fan motor pulleys are factory set for speed shown in Table 1.

To change fan speeds:

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 tighten-

ing 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 Adjust-

ment section on page 27).

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft.

3. Make angular alignment by loosening motor from

mounting plate.

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 sys-

tem 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.

2. Remove the center post (located between the evapora-

tor fan and heating control access panels) and all

screws securing it.

3. Loosen nuts on the 2 carriage bolts in the motor

mounting base.

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.

5. Remove the belt drive.

MANUFACTURER LUBRICANT

Texaco Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak 2

Fig. 30 — Evaporator-Fan Alignment and Adjustment

—27—

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 sup-

port channel that interfere with the motor slide path.

9. Slide out the motor and motor mounting plate.

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. deflec-

tion 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.

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.

Fig. 31 — 581A155 Evaporator-Fan Motor Adjustment

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

NOTE: Dimension is in inches.

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

NOTE: Dimension is in inches.

Fig. 34 — Condenser Fan Adjustment, 581A240

—28—

4. Tighten setscrews and replace rubber hubcap to pre-

vent hub from rusting to motor shaft.

5. Fill hub recess with permagum if rubber hubcap is

missing.

VII. ECONOMIZER ADJUSTMENT

See Tables 16 and 17 for checkout and outdoor air tempera-

ture simulation. Make certain the outdoor-air damper is

fully closed and the return-air damper is fully open before

completing the following steps:

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.

3. Adjust the vent position with the minimum damper-

position adjustment on the economizer motor control

module. See Fig. 18.

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

Table 17 — High and Low Outdoor-Air Simulation

5. Set the outdoor-air thermostat (OAT), located in the

economizer section of the unit (see Fig. 17) to 75 F.

6. If the outdoor temperature is below 75 F, the econo-

mizer 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.

7. Jumper terminal T to terminal T1 on the module (see

Fig. 18). The economizer will go to the full open posi-

tion. The outdoor-air damper will go to the full open

position, and the return-air damper will go to the full

closed position.

8. Adjust mechanical linkage, if necessary, for correct

positioning. If may be necessary to remove the filters

to adjust the linkage.

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.

10. If the Cooling mode was simulated to operate the unit

in Step 4, remove the jumper and reconnect the ther-

mostat wires to terminals Y1 and Y2.

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.

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.

NOTE: Do not use recycled refrigerant as it may contain

contaminants.

A. No Charge

Use standard evacuating techniques. After evacuating sys-

tem, weigh in the specified amount of refrigerant (refer to

Table 1).

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 inter-

section point on chart is above line, add refrigerant. If inter-

section 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.

TEST PROCEDURE RESULTS

A. Disconnect power at

TR and TR1.

Disconnect jumper

between P and

P1. See Fig. 18.

B. Jumper TR to 1.

C. Jumper T1 to T.

D. Disconnect outdoor-air

thermostat connections

from SO and +.

Factory-installed

800 ohm resistor

should remain connected

to SR and +.

E. Reconnect power to

terminals TR and TR1.

1. LED (light-emitting diode)

should be off.

2. Motor is in closed position.

TEST PROCEDURE RESULTS

Disconnect factory-installed

resistor from terminals

SR and +.

1. LED should be on.

2. Motor drives toward open.

TEST PROCEDURE RESULTS

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.

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.

High outdoor-air test results:

1. LED should be off.

2. Motor drives toward closed.

—29—

X. GAS VALVE ADJUSTMENT

A. Natural Gas

The gas valve opens and closes in response to the thermostat

or limit control.

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).

To adjust regulator:

1. Set thermostat at setting for no call for heat.

2. Turn main gas valve to OFF position.

3. Remove 1/8-in. pipe plug from manifold or gas valve

pressure tap connection. Install a suitable pressure-

measuring device.

4. Set main gas valve to ON position.

5. Set thermostat at setting to call for heat.

6. Remove screw cap covering regulator adjustment

screw (See Fig. 36).

7. Turn adjustment screw clockwise to increase pres-

sure or counterclockwise to decrease pressure.

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.

XI. MAIN BURNERS

For all applications, main burners are factory set and should

require no adjustment.

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.

9. Remove 2 screws that hold the burner support plate

flange to the vestibule plate.

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.

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

rack.

3. Using a soft brush, clean burners and crossover port

as required.

4. Adjust spark gap. See Fig. 37.

5. Reinstall burners on rack.

6. Reinstall burner rack as described above.

XII. FILTER DRIER

Replace whenever refrigerant system is exposed to

atmosphere.

XIII. PROTECTIVE DEVICES

A. Compressor Protection

Overcurrent

Each compressor has internal line break motor protection.

Overtemperature

Each compressor has an internal protector to protect it

against excessively high discharge gas temperatures.

Crankcase Heater

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.

IMPORTANT: After prolonged shutdown or servicing, ener-

gize the crankcase heaters for 24 hours before starting the

compressors.

Compressor Lockout

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, manu-

ally move the thermostat setting.

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.

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.

Fig. 35 — Cooling Charging Chart

50

40 100 150 200 250 300 350 400

60

80

100

120

140 ALL OUTDOOR FANS MUST BE OPERATING

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

BOTH CIRCUITS

REDUCE CHARGE IF BELOW CURVE

ADD CHARGE IF ABOVE CURVE

Fig. 36 — Gas Valve

—30—

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 automati-

cally 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 com-

pressor 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.

—31—

581A180360 AND 581A240360

Fig. 37 — Spark Gap Adjustment

SEE

DETAIL

"C"

SEE

DETAIL

"C"

SEE

DETAIL

"C"

581A155225

581A180270, 581A240270, AND 581A155300

—32—

LEGEND

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

AHA — Adjustable Heat Anticipator

BKR W/AT — Breaks with Amp Turns

BR — Burner Relay

C—

Contactor, Compressor

CAP — Capacitor

CB — Circuit Breaker

CC — Cooling Compensator

CH — Crankcase Heater

CLO — Compressor Lockout

CLS — Compressor Lockout Switch

COMP — Compressor Motor

CR — Control Relay

CT — Current Transformer

DM — Damper Motor

DU — Dummy Terminal

EQUIP — Equipment

FPT — Freeze Protection Thermostat

FU — Fuse

GND — Ground

GVR — Gas Valve Relay

HPS — High-Pressure Switch

HS — Hall Effect Sensor

HV — High Voltage

IDM — Induced-Draft Motor

IFC — Indoor (Evaporator) Fan Contactor

IFCB — Indoor (Evaporator) Fan Circuit

Breaker

IFM — Indoor (Evaporator) Fan Motor

IGC — Integrated Gas Unit Controller

L—

Light

LED — Light-Emitting Diode

LOR — Lockout Relay

LPS — Low-Pressure Switch

LS — Limit Switch

MAT — Mixed-Air Thermostat

MGV — Main Gas Valve

NEC — National Electrical Code

OAT — Outdoor-Air Thermostat

OFC — Outdoor (Condenser) Fan Contactor

OFM — Outdoor (Condenser) Fan Motor

PL — Plug Assembly

QT — Quadruple Terminal

R—

Relay

RS — Rollout Switch

SN — Sensor

SW — Switch

TB — Terminal Block

TRAN — Transformer

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

NOTES:

1. Compressor and fan motors thermally protected; 3-phase motors protected against pri-

mary 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 sig-

nifies 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)

—33—

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

—34—

ECONOMIZER OPTION/ACCESSORY

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

—35—

TROUBLESHOOTING

Refer to Tables 18 and 19 for troubleshooting details.

Table 18 — Cooling Service Analysis

LEGEND

TXV — Thermostatic Expansion Valve

PROBLEM CAUSE REMEDY

Compressor and condenser fan will

not start. Power failure. Call power company.

Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker.

Defective thermostat, contactor, transformer,

or control relay. Replace component.

Insufficient line voltage. Determine cause and correct.

Incorrect or faulty wiring. Check wiring diagram and rewire correctly.

Thermostat setting too high. Lower thermostat setting below room

temperature.

Compressor will not start but

condenser fan runs. Faulty wiring or loose connections in

compressor circuit. Check wiring and repair or replace.

Compressor motor burned out, seized, or

internal overload open. Determine cause. Replace compressor.

Defective overload. Determine cause and replace.

Compressor locked out. Determine cause for safety trip and reset

lockout.

One leg of 3-phase power dead. Replace fuse or reset circuit breaker.

Determine cause.

Compressor cycles (other than

normally satisfying thermostat). Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge to

nameplate.

Defective compressor. Replace and determine cause.

Insufficient line voltage. Determine cause and correct.

Blocked condenser. Determine cause and correct.

Defective overload. Determine cause and replace.

Defective thermostat. Replace thermostat.

Faulty condenser-fan motor. Replace.

Restriction in refrigerant system. Locate restriction and remove.

Compressor operates continuously. Dirty air filter. Replace filter.

Unit undersized for load. Decrease load or increase unit size.

Thermostat set too low. Reset thermostat.

Low refrigerant charge. Locate leak, repair, and recharge.

Air in system. Recover refrigerant, evacuate system, and recharge.

Condenser coil dirty or restricted. Clean coil or remove restriction.

Excessive head pressure. Dirty air filter. Replace filter.

Dirty condenser coil. Clean coil.

Refrigerant overcharged. Recover excess refrigerant.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Air in system. Recover refrigerant, evacuate system, and recharge.

Condenser air restricted or air short-cycling. Determine cause and correct.

Head pressure too low. Low refrigerant charge. Check for leaks, repair, and recharge.

Restriction in liquid tube. Remove restriction.

Excessive suction pressure. High heat load. Check for source and eliminate.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Refrigerant overcharged. Recover excess refrigerant.

Suction pressure too low. Dirty air filter. Replace filter.

Low refrigerant charge. Check for leaks, repair, and recharge.

Metering device or low side restricted. Remove source of restriction.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Insufficient evaporator airflow. Increase air quantity. Check filter and replace if necessary.

Temperature too low in conditioned area. Reset thermostat.

Field-installed filter drier restricted. Replace.

Compressor no. 2 will not run. Unit in economizer mode. Proper operation; no remedy necessary.

—36—

Table 19 — Heating Service Analysis

LEGEND

GR — Ground

PROBLEM CAUSE REMEDY

Burners will not ignite. Misaligned spark electrodes. Check flame ignition and sensor electrode positioning. Adjust

as needed.

No gas at main burners. 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.

Water in gas line. Drain water and install drip leg to trap water.

No power to furnace. Check power supply, fuses, wiring, and circuit breaker.

No 24 v power supply to control circuit. Check transformer. Transformers with internal overcurrent

protection require a cool-down period before resetting. Check

24-v circuit breaker; reset if necessary.

Miswired or loose connections. Check all wiring and wire nut connections.

Burned-out heat anticipator in thermostat. Replace thermostat.

Broken thermostat wires. Run continuity check. Replace wires if necessary.

Inadequate heating. Dirty air filter. Clean or replace filter as necessary.

Gas input to unit too low. Check gas pressure at manifold. Clock gas meter for input.

If too low, increase manifold pressure or replace with correct

orifices.

Unit undersized for application. Replace with proper unit or add additional unit.

Restricted airflow. Clean filter, replace filter, or remove any restrictions.

Blower speed too low. Install alternate motor, if applicable, or adjust pulley to increase

fan speed.

Limit switch cycles main burners. Check rotation of blower, thermostat heat anticipator settings,

and temperature rise of unit. Adjust as needed.

Too much outdoor air. Adjust minimum position.

Check economizer operation.

Poor flame characteristics. Incomplete combustion (lack of combustion air)

results in:

Aldehyde odors, CO, sooting flame, or floating

flame.

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.

Burners will not turn off. Unit is locked into Heating mode for a one minute

minimum. Wait until mandatory one minute time period has elapsed or

power to unit.

—37—

Refer to Fig. 40 for IGC troubleshooting information.

LEGEND

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

IDM — Induced-Draft Motor

IGC — Integrated Gas Unit Controller

Fig. 40 — IGC Control (Heating and Cooling)

Copyright 1999 Bryant Heating & Cooling Systems CATALOG NO. 5358-101

PACKAGED SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equip-

ment discussed in this manual, including:

A large selection of product, theory, and skills programs are available, using popular video-based for-

mats 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 [ ] Classroom Service Training

• Unit Familiarization • Maintenance

• Installation Overview • Operating Sequence

Copyright 1999 Bryant Heating & Cooling Systems CL-1 CATALOG NO. 5358-101

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

START-UP CHECKLIST

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

(180, 240 ONLY)

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

II. START-UP

ELECTRICAL

SUPPLY VOLTAGE 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 F WB (Wet Bulb)

COOLING SUPPLY AIR F

GAS HEAT SUPPLY AIR F

PRESSURES

GAS INLET PRESSURE IN. WG

GAS MANIFOLD PRESSURE STAGE NO. 1 IN. WG STAGE NO. 2 IN. WG

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.

GENERAL

ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

MODEL NO.: SERIAL NO.:

DATE: TECHNICIAN: