Bryant 581A User Manual

installation, start-up and service instructions

SINGLE PA CKA GE RO OFT OP ELECTRIC COOLING/GAS HEATING UNITS

CONTENTS

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 Inl et

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

Page

581A

Sizes 155-240

Cancels: II 581A-155-2 II 581A-155-3

6/15/99

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 vapor s and l iq uids in t he vici nity of this or a ny 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 buildi ng.

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.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance functions of cleaning coils and filters and replacing filters. All ot he r oper ati ons s hou ld be pe rfor med by tr ain ed se rvi ce 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 sa fe ty codes. Wear safet y gl a sse s an d w o rk g lov e s. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

WARNING: Before performing service or maintenance operations on unit, turn off mail power s wi tch to unit. electrical shock cou l d cause personal inju ry.

WARNING: Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig. Pressures greater than 0.5 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced before use. When pressure testing fieldsupplied gas piping at pre ssures of 0.5 ps ig or less, a unit connected to such piping must be isolated by closing the manual gas valve(s).

IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the units will automatically lock the compressor out of operation. Manual res et will be required to resta r t th e compre ss o r.

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.)

—2—

PKG. NO. REF.

CRRFCURB010A00

CRRFCURB011A00

CRRFCURB012A00

CURB

HEIGHT

ft-in. (mm)

1-2

(305)

2-0

(610)

2-0

(610)

DESCRIPTION

Standard Curb

14” High

Standard Curb

for Units

Requiring High

Installation

Side Supply

and Return

Curb for High

Installation

NOTES:

1. Roof curb accessory is shipped disassembled.

2. Insulated panels: 1 in. thick neoprene coated 1

3. Dimensions in ( ) are in millimeters.

/2 lb density.

4. Direction of airflow.

5. Roof curb: 16 ga. (VA03-56) stl. To pre vent the hazard of stagnant water build-up in the drain

NOTE:

pan of the indoor section, unit can only be pitched as shown.

Dimensions (degrees and inches)

UNIT

ALL

DEG.IN.DEG.IN.

.28 .45 .28 .43

Fig. 1 — Roof Curb Details

For preassembled horizontal adapter roof curb part no.

NOTE:

(CRRFCURB013A00), the accessor y 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

IMPORTANT: Curb or adapt er roof cur b must be lev el. Th is is

necessary to per mit unit drain to function properly. Unit leveling tolerance is ±

/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 gasket with the roof curb or adapter as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance.

B. 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 tran sportat i on 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 prev ent sling or cabl e damage. Rollers may be used to move unit across a roof. Level by usi n g unit frame as a reference; lev eling toler a n ce is ±

/16 in. per linear ft in any direction. See Fig. 3 for additional information. Unit operating weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails as shown in Fig. 3. Refer to ri ggi ng inst ruct ions 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, ade quate combustion a nd ventilation air must be provided in accordance with Section 5.3 (Air for Combustion and Ventilation) of the National Fuel Gas Code, ANSI Z223.1 (American National Standards Institute) .

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 building. When unit is located adjacent to public walkways, flue assembly must be at leas t 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

155 180 240

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 inser ting hook s in to uni t ba se rails as show n. Use c or n er pos t from packaging to protect coil from damag e. Use bumper boards for spreader bars on all units.

5. Weights do not include opti onal economi zer. 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 condens er coi l. Add 280 lb (127 kg ) for copper condenser and evaporator coils.

CAUTION:

MAXIMUM SHIPPING

WEIGHT

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

1725 782 6-11 1800 816 6-11 1900 862 6-11

All panels must be in place when rigging.

DIMENSIONS

2121 4-0 1219 2121 3-2 964 2121 3-4 1016

Fig. 3 — Rigging Details

—3—

—4—

STD UNIT

UNIT

WEIGHT

581A

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

ECONO-

MIZER

WEIGHT

CORNERACORNERBCORNERCCORNER

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in millimeters.

DIM A DIM B DIM C

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 dim ension 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.

POWER EXHAUST/ BAROMETRIC RELIEF (ACCESSORY ONLY)

• 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 outsi de of corner post. Allow 0 ft-

side for top cover drip edge.

/16 in. (8) on each

581A180 ONLY

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

POWER EXHAUST/

BAROMETRIC RELIEF

(ACCESSORY ONLY)

FIELD SUPPLIED

—5—

UNIT STD. UNIT WEIGHT

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 dimensio n 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 fr om outside of cor ner post. Allow 0 ft -

side for top cover drip edge.

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

ECONOMIZER

WEIGHT

/16 in. (8) on each

Fig. 5 — Base Unit Dimensions; 581A240

T able 1 — Physical Data

UNIT 581A 155 180 240 NOMINAL CAPACITY (tons)

OPERATING WEIGHT (lb)

Unit

Al/Al* Al/Cu*

Cu/Cu* Economizer Roof Curb†

COMPRESSOR

Quantity Number of Refrigerant Circuits Crankcase Heater Watts Oil (oz) (Ckt 1, Ckt 2)

REFRIGERANT TYPE

Expansion Device Operating Charge (lb oz)

Circuit 1**

Circuit 2

CONDENSER COIL Rows...Fins/in.

Total Face Area (sq ft)

CONDENSER FAN

Nominal Cfm Quantity...Diameter (in.) Motor Hp...Rpm Watts Input (Total)

EVAPORATOR COIL

Rows...Fins/in. Total Face Area (sq ft)

EVAPORATOR FAN

Quantity...Size (in.) Type Drive Nominal Cfm Std Motor Hp Opt Motor Hp Motor Nominal Rpm

Std Maximum Continuous Bhp Opt Maximum Continuous Bhp

Motor Frame Size Fan Rpm Range Low-Medium Static

Motor Bearing Type Maximum Allowable Rpm Motor Pulley Pitch Dia. Low-Medium Static

Nominal Motor Shaft Diameter (in.) Fan Pulley Pitch Diameter (in.) Low-Medium Static

Nominal Fan Shaft Diameter (in.) Belt, Quantity...Type... Length (in.) Low-Medium Static

Pulley Center Line Distance (in.) Speed Change per Full Turn of

Movable Pulley Flange (Rpm)

Movable Pulley Maximum

Full Turns From Closed Position Factory Speed Factory Speed Setting (Rpm) Low-Medium Static

FURNACE SECTION

Rollout Switch Cutout Temp (F) ll Burner Orifice Diameter (in...drill size)

Natural Gas

Thermostat Heat Anticipator Setting

Stage 1 (amps) Stage 2 (amps)

Gas Input (Btuh)Stage 1 Efficiency (Steady State) (%)

Temperature Rise Range Manifold Pressure (in. wg)

Natural Gas Gas Valve Quantity GasValvePressure Range (in. wg)

Stage 2

(psig)

High Static

Low-Medium Static

High Static

0.98 0.8 0.98 0.8 0.98 0.8

0.44 0.44 0.44 0.44 0.44 0.44

Field Gas C onnection Size (in.-FPT)

HIGH-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

LOW-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

FREEZE PROTECTION THERMOSTAT (F)

Opens Closes

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.)

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

LEGEND

Al — Bhp — Cu — TXV —

Aluminum Brake Horsepower Copper Thermostatic Expansion Valve

12 15 20

1725 1800 1900 1875 1950 2050 2005 2080 2180

110 110 110 200 200 200

22 2 22 2

70 70 70

60,66 85,60 110,110

20.7 19.5 18.5

11.9 13.45 13.3

Cross-Hatched

/2...1050

2...10 X 10 2...12 x 12 2...12 x 12

4...15 4...15 4...15

10,500 10,500 14,200

3...22 3...22 2...30

/8-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins

21.7 21.7 21.7

1100 1100 3400

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

4...15 4...15 4...15

17.5 17.5 17.5

Belt Belt Belt

5200 6000 8000

2.9 5 7.5

3.7

1725 1745 1745

R-22 TXV

Propeller Type

/2...1050 1...1075

Centrifugal Type

3.13 6.13 9.47 (208 v)

4.38 56H 184T 213T

834-1064 873-1021 1002-1151

1161-1426 1025-1200 1193-1369

Ball Ball Ball

1550 1550 1550

3.1/4.1 4.9/5.9 5.4/6.6

3.7/4.7 4.9/5.9 5.4/6.6

6.0 9.4 9.4

5.2 8.0 7.9

1...BX...42 1...BX...50 1...BX...54

1...BX...42 1...BX...48 1...B X...50

13.5-15.5 13.3-14.8 14.6-15.4

11/

17/

58 37 37 67 44 44

4†† 4†† 4††

3.5 3.5 3.5 978 965 1095

1327 1134 1303

190 190 190

0.1285...30/ 0.136...29 0.1285...30/ 0.136...29 0.1285...30/ 0.136...29

172,000/230,000 206,000/275,000 206,000/275,000 225,000/300,000 270,000/360,000 270,000/360,000

81 81 81

15-45/30-60 15-45/20-50 15-45/20-50

3.3 3.3 3.3

11 1

5.5-13.5 5.5-13.5 5.5-13.5

.235-.487 .235-.487 .235-.487

*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.

426 320

27 44

30 ± 5 45 ± 5

Cleanable

2...20 x 25 x 1

1...20 x 20 x 1 Throwaway

4...20 x 20 x 2

4...16 x 20 x 2

(230 and 460 v)

13/

17/

10.33

—6—

III. STEP 3 — FIELD FABRICATE DUCTWORK

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

Ducts passing through an unconditioned space must be insulated 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. Ductwork 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.

WARNING: For vertical supply and return units, tools or parts coul d drop into ductwork a nd 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.

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.

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

NOTE:

leak.

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

(581A180, 240 Unit Shown)

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

NOTE:

leak.

Fig. 7 — Concentric Duct Air Distribution

(581A180, 240 Unit Shown)

Dimensions A, A’, B and

NOTE:

B’ are obtained from field-supplied ceiling diffuser. Shaded areas indicate block-off pans.

Fig. 8 — Concentric Duct Details

INLET

WIND BAFFLE

LOUVERS

FLUE SCREEN

Fig. 9 — Flue Hood Location

—7—

INDUCED DRAFT

3/4" FPT DRAIN CONNECTION

1-3/8" DRAIN HOLE

INDOOR MOTOR ACCESS

FILTER ACCESS

MOTOR

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

COMBUSTION FAN HOUSING

MAIN BURNER SECTION

HEAT EXCHANGER SECTION

Fig. 10 — Combustion Fan Housing Location

VI. STEP 6 — TRAP CONDENSATE DRAIN

See Fig. 4, 5, and 11 fore drain location. Plug is provided in drain hole and must be removed when unit is operating. One

/4 in. half coupling is provided inside unit evaporat or section for condensate drain connection. An 8 nipple and a 2 in. x standard

/4 in. diameter elbow to provide a straight path

/4 in. diamet er pi pe ni ppl e are co uple d to

/2 in. x 3/4 in. diameter

down through holes in unit base rails (see Fig. 11 and 12). A trap at least 4 inc hes deep must be used.

VII. STEP 7 — INSTALL GAS PIPING

The gas supply pipe enters the unit through the 1 diameter knockout provided. The gas connection to the unit is made to th e

/4 in. FPT gas inlet on the gas manifold. Unit

/2 in.

is equipped for use with natural gas. Installation must conform with local building codes or, in the absence of local codes, wi th the National Fuel Gas code, ANSI Z223.1.

Install field-supplied manual gas shutoff valve with a

/8 in. NPT pressure tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 13. Install sedim ent 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 b y connecti ng a piping tee to riser lead ing to he ating section, so that straight-through section of tee is vertical. Then, connect capped n ipple in to lower end of t ee. Extend capped nipple below level of gas contr ols.

Fig. 11 — Condensate Drain Details

(581A155 Shown)

Fig. 12 — Condensate Drain Piping Detai ls

WARNING: Do not pressure test gas supply while

connected to unit. Always disconnect union before servicing.

IMPORTANT: Natural gas pressure at unit gas connection must not be less than 5.5 in. wg or greater than 13.5 in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.

VIII. STEP 8 — MAKE ELECTRICAL CONNECTIONS A. Field Power Supply

Unit is factory wired for voltage shown on unit nam epl ate. When installing units, provide a disconnect per NEC

(National Electrical Code) requirements of adequate size (Table 2).

Fig. 13 — Field Gas Piping

—8—

Route power and ground lines through control box end panel or unit basepa n (s ee Fig. 4 and 5) to connections as shown on unit wiring diag ram and Fig. 14.

CAUTION: The correct power phasing is critical in the operation of the scroll compressors. An incorrect phasing will cause the compressor to rotate in the wrong direction. This may lead to premature compressor failure.

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

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 ) wi re.

2. Remove cap from orange ( 230 v ) spliced wire.

3. Replace oran ge wir e wi th red wire.

4. Recap both wires.

IMPORTANT: BE CERTAIN UNUSED WIRES ARE CAPPED. Failure to do so may damage the transformers.

Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2%.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any warrant y.

B. Field Control Wiring

The unit must have a separate electrical service with a fieldsupplied , w at e rp ro o f, fuse d di sconnect sw i tc h mou nted at, or within sight fr o m , th e unit. R ef e r to the u n i t r a ti n g plate fo r maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing. Be sure disconnect switch does not obst ruct 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 fie l d power connect ions. Inst all conduit conne ctors 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 s pace to sense average temperature.

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

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 AW G 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 antic i pator settings as follows:

VOLT AGE W1 W2

208/230

460

0.98 0.44

0.80 0.44

The room thermostat heat anticipator must be properly adjusted to ensure proper heating performance. Set the heat anticipator to settings based on the table above, by using an ammeter to determine the exact setting for stages 1 and 2. Failure to make a proper heat anticipator adjustment may result in improper operation, discomfort to the occupants of the conditioned space, and inefficient energy utilization; however, the required setting m ay be changed slightly to provide a greater de gr ee 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 Mot or C ontrol 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.

The maximum wire size for TB1 is 2/0.

NOTE:

EQUIP — GND — NEC — TB —

LEGEND

Equipment Ground National Electrical Code T erminal Board

Fig. 14 — Field Power Wiring Connections

Fig. 15 — Field Control Therm ostat Wiring

—9—

Table 2 — Electrical Data

NOMINAL

UNIT

VOLTAGE

581A

(Standard

(Optional

LEGEND FLA —

HACR — IFM —

LRA — MCA — MOCP — NEC — OFM — RLA —

*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.

Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

the following formula to determine the percent voltage imbalance.

% Voltage Imbalance

= 100 x

(3 Ph, 60

Hz)

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

015

IFM)

015

IFM)

017

025

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

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

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

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

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

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

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

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

max voltage deviation from average voltage average voltage

VOLTAGE

RANGE

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

COMPRESSOR

No. 1 No. 2

Use

7 457

POWER

EXHAUST

—

2.3—6.0

—

2.3—6.0

—

2.3—6.0

—

2.3—6.0

OFM IFM

8.8/

8.4—4.6—18.8

11.0/

10.5—4.6—18.8

15.8/

15.8—4.6—18.8

25.0/

25.0—4.6—18.8

EXAMPLE: Supply voltage is 460-3-60.

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

Average Voltage =

= 457 Determine maximum deviation from average voltage.

(AB) 457 – 452 = 5 v (BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v

Maximum deviation is 7 v. Determine percent voltage imbalance.

% Voltage Imbalance = 100 x

= 1.53% This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT:

utility company immediately.

452 + 464 + 455 3

1371 3

If the supply voltage phase imbalance is more than 2%, contact y our local electric

COMBUSTION

FAN MOTOR

0.57

0.30

0.57

0.30

0.57

0.30

0.57

0.30

59/59 64/63

29 31

61/61 66/65

30 32

82/82 86/86

41 43

124/124 129/129

61 63

POWER

SUPPLY

110/110 110/110

150/150 150/150

70/70 80/80

35 40

80/80 80/80

35 40

50 50

80 80

—10—

Fig. 16 — 25% Outdoor-Air Sect ion Details

Fig. 17 — Economizer Damper Assembl y-End View

Fig. 19 — Economizer Motor Control

Module Location

Damper Vent Position Setting

1. Set fan switch at ON position (continuous fan operation) and close night switch if used.

2. Set system selecto r swit ch at OFF position.

3. Turn damper adjustment knob located on control module clockwise slowly until dampers assume desired v e n t p os iti on. Do not manually operate econo-

mizer motor, since damage to motor will res ult.

X. STEP 10 — INSTALL OUTDOOR-AIR HOOD

The outdoor-air hood is common to 25% air ventilation and econ omizer. If eco nomizer is used , all elec trica l connec tions 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 ).

LEGEND

LED —

Light- Emitti ng Diode

Fig. 18 — Economizer Motor Control Mod ule

(Part Number W7459A)

Fig. 20 — Outdoor-Air Hood Component Locati on

—11—

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

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

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

Fig. 21 — Seal Strip Location

BAFFLE (180 AND 240 SIZES ONLY)

LOWER FILTER RETAINER

FILTER SUPPORT BRACKET

8. Insert outd oor-air inlet screens and spacer i n 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 BEF OR E th e economizer hoods ar e 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 S and +). See Fig. 18.

2. Remove black wire assembly containing the 620-ohm resistor from between economizer control module terminal S

and the outdoor-air thermostat (O A T ). Place

this wire assembly (containing the 620-ohm resistor) between economizer control module terminals S

and

+, replacing the jumper removed in Step 1. See Fig. 18.

3. Disconnect the blue wire from the OAT.

4. Remove OAT from the outside of the economizer. See Fig. 17.

5. Mount the enthalpy sensor (Fig. 23) to the economizer on the outside of the unit (in the same location from which the OAT was removed) using the 2 screws provided. See Fig. 17.

6. Reconnect the blue wire removed in Step 3 to the enthalpy sen sor 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 terminal S, through the snap bushing, and to the economizer control module terminal S

. 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 sens or 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 SIDE

HOOD TOP PANEL

HOOD DRAIN PAN

UPPER FILTER RETAINER

The outdoor air hood comes with a baffle which is used on

NOTE:

sizes 180 and 240 only. Discard baffle for size 155 units.

PANELS (2)

FILTER SUPPORT BRACKET

Fig. 22 — Outdoor-Air Hood Details

BAFFLE (180 AND 240 ONLY)

LOWER FILTER RETAINER

Fig. 23 — Outdoor-Air and Return-Air

Enthalpy Sensor

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