Bryant Durapac Plus 551a User Manual

installation, start-up and service instructions

SINGLE PACKAGE ROOFTOP ELECTRIC COOLING/ELECTRIC HEATING UNITS

Cancels: II 551A-155-2 II 551A-155-3

Dura

Plus Series

Pac

Sizes 155-240

551A

3/1/01

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17

I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1

II. Step 2 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 1

III. Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 7

IV. Step 4 — Make Unit Duct Connections . . . . . . . . . . .7

V. Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . 7

VI. Step 6 — Make Electrical Connections

VII. Step 7 — Make Outdoor-Air Inlet

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

VIII. Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . 12

IX. Step 9 — Install All Accessories . . . . . . . . . . . . . . 15

X. Step 10 — Install Humidistat for Optional

Perfect Humidity™ Dehumidification Package . . 16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-25

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-32

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .33,34

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

SAFETY CONSIDERATIONS

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

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations sh o uld be perfor me d by trai ne d 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 precaution s that may apply.

Follow all safety codes. Wear safety glasse s and work g love s. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

WARNING:

Before performing service or mainte-

. . . . . . . . . . . . 8

nance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the unit 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 and install accessory roof curb or horizontal supply roof curb in accordan ce with instructions shipped with the accessory. Accessory roof curb and horizontal supply roof curb and information required to field fabricate a roof curb or horizontal supply roof curb are shown in Fig. 1 and 2. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be secured to roof curb before unit is set in place.

IMPORTANT: The gasketing of the unit to the roof curb or horizontal supply roof curb is critical for a leakproof seal. Install gasket supplied with the ro of curb or h orizontal supply roof curb as shown in Fig. 1. Improperly applied gasket can result in air leaks and poor unit performance.

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

B. Alternate Unit Support

When the curb or adapter cannot be used, support unit with sleepers using unit curb or adapter s upport area. If sl eepers cannot be used, su ppor t l on g si des o f 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 da mage. File any claim with transportation agency. Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as a reference; leveling tolerance is

/16 in. per linear ft in any direction. See Fig. 3 for addi-

tional information. Unit 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

Provide clearance around and above unit for airflow, safety, and service access (Fig. 4 and 5).

Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.

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

B. Roof Mount

Check building codes for weight distribution requirements.

/16 in.

NOTES:

1. Roof curb accessory is shipped disassembled.

lb density.

.28 .45 .28 .43

DIMENSIONS* (DEGREES AND INCHES)

UNIT

Deg. in. Deg. in.

ALL

thick neoprene coated 1

″

90 degree elbow must be installed on the supply ductwork

To prevent the hazard of stagnant water build-up in the drain pan of

2. Insulated panels: 1

3. Dimensions in ( ) are in millimeters.

below the unit discharge for units equipped with electric heaters.

4. Direction of airflow.

5. Roof curb: 16 ga. (VA03-56) stl.

NOTE:

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

DESCRIPTION

CURB

HEIGHT

Fig. 1 — Roof Curb Details

High

″

Standard Curb

for Units Requiring

Standard Curb

″

-2

′

High Installation

″

-0

′

(610)

(305)

High-Static

Side Supply and

Transition Duct

Return Curb for

High Installation

″

-0

′

(610)

PKG. NO. REF.

CRRFCURB011A00

CRRFCURB010A00

CRRFCURB013A00

CRRFCURB012A00

—2—

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 Supply Roof Curb and Horizontal

Adapter Roof Curb

UNIT 551A

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 inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from damage. Use bumper boards for spreader bars.

5. Weights do not include optional EconoMi$er. Add 80 lb (36 kg) for EconoMi$er weight.

6. Weights given are for aluminum evaporator and condenser coil plate fins. Weights include electric heat.

7. Add 75 lb (34 kg) for crating on 551A155 and 180 units. Add 135 lb (61 kg) for crating on 551A240 units.

8. Add 150 lb (68 kg) for copper condenser coil. Add 280 lb (127 kg) for copper condenser and evaporator coils.

MAXIMUM

SHIPPING WEIGHT

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

1625 737 6-11 1700 771 6-11 1800 816 6-11

DIMENSIONS

/22121 4- 0 1219

/22121 3-10 1168

/22121 3- 7 1092

CAUTION:

All panels must be in place when rigging.

Fig. 3 — Rigging Details

—3—

(8) on each

″

′

DIM A DIM B DIM C

CORNER

(2134) for coil removal. This dimension can be reduced to

CORNER

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in millimeters.

3. Center of Gravity.

NOTES:

4. Direction of airflow.

″

-0

′

(1219) if conditions permit coil removal from the top.

″

-0

′

• Rear: 7

5. Ductwork to be attached to accessory roof curb only.

6. Minimum clearance:

(1219) for proper condenser coil airflow.

″

-0

′

• Left side: 4

(1219) for proper operation of damper and power

″

-0

′

(1219) for control box access.

″

-0

′

• Front: 4

• Right side: 4

(1829) to assure proper condenser fan operation.

″

-0

′

exhaust if so equipped.

• Top: 6

• Local codes or jurisdiction may prevail.

damper/ power exhaust as stated in Note #6, a removable fence or

7. With the exception of clearance for the condenser coil and the

90 degree elbow must be installed on the supply ductwork A

below the unit discharge for units equipped with electric heaters.

side for top cover drip edge.

barricade requires no clearance.

9. See drawing 50TJ500352 for service option details.

8. Dimensions are from outside of corner post. Allow 0

10.

CORNER

ECONOMI$ER

STD UNIT

WEIGHT

UNIT

551A

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

1575 714 80 36.3 407 185 375 170 383 174 410 186 3-5 1039 3-5 1054 1-10 559

1650 748 80 36.3 375 170 375 170 449 204 452 205 3-2 963 3-7 1092 1-10 559

155

180

Fig. 4 — Base Unit Dimensions, 551A155 and 180

—4—

(8) on

″

′

DIM A DIM B DIM C

CORNER

ECONOMI$ER

STD UNIT

UNIT

WEIGHT

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

551A

1750 794 80 36.3 420 191 395 179 448 203 486 221 3-3 988 3-5 1054 1-8 508

240

(1219) if conditions permit coil removal from the

″

-0

(2134) for coil removal. This dimension can be

′

″

-0

′

reduced to 4

top.

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in millimeters.

3. Center of Gravity.

NOTES:

4. Direction of airflow.

5. Ductwork to be attached to accessory roof curb only.

6. Minimum clearance:

• Rear: 7

(1219) for proper condenser coil airflow.

″

(1219) for control box access.

-0

′

″

-0

′

• Front: 4

• Left side: 4

(1219) for proper operation of damper and power

″

-0

′

(1829) to assure proper condenser fan operation.

″

-0

′

exhaust if so equipped.

• Right side: 4

• Top: 6

• 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 #6, a removable fence

or barricade requires no clearance.

8. Dimensions are from outside of corner post. Allow 0

90 degree elbow must be installed on the supply ductwork

each side for top cover drip edge.

below the unit discharge for units equipped with electric

heaters.

9. See drawing 50TJ500352 for service option details.

10.

Fig. 5 — Base Unit Dimensions, 551A240

—5—

Table 1 — Physical Data

UNIT 551A NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb)

Unit

Al/Al* Al/Cu*

Cu/Cu* EconoMi$er Roof Curb† Perfect Humidity™ Dehumidification Package

COMPRESSOR

Quantity...Model (Ckt 1, Ckt 2) Number of Refrigerant Circuits Crankcase Heater Watts Loading (% of Full Capacity) Oil (oz) (Ckt 1, Ckt 2)

REFRIGERANT TYPE

Expansion Device Operating Charge (lb)**

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 Low-Medium Static Pulley Flange (Rpm) High Static Movable Pulley Maximum Full Turns

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

HIGH-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

LOW-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

FREEZE PROTECTION THERMOSTAT (F)

Opens Closes

High Static

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

*Evaporator coil fin material/condenser coil fin material.

†Weight of 14-in. roof curb.

155 180 240

12 15 20

1575 1650 1750 1725 1800 1900 1855 1930 2030

80 80 80

200 200 200

40 40 40

1...ZR72KC, 1...ZR57KC 1...ZR94KC, 1...ZR72KC 1...ZR125KC, 1...ZR108KC 22 2

70 70 70

0, 56, 100 0, 60, 100 0, 60, 100

60, 66 85, 60 110, 110

20.7 19.5 18.5

11.9 13.45 13.3

Cross-Hatched

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

21.7 21.7 21.7

10,500 10,500 14,200

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

/2...1050

1100 1100 3400

Cross-Hatched

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

17.5 17.5 17.5

2...10 x 10 2...12 x 12 2...12 x 12 Belt Belt Belt

5200 6000 8000

2.9 5 7.5

3.7

1725 1745 1745

3.13 6.13 9.47 [208 v], 10.33 [230 v and 460 v]

4.38 N/A N/A 56H 184T 213T

834-1064 873-1021 1002 -1151

1161-1426 1025-1200 1193-1369

Ball Ball Ball

1,550 1,550 1,550

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...BX...50

13.5-15.5 13.3-14.8 14.6-15.4 58 37 37 67 44 44

4†† 4†† 4††

3.5 3.5 3.5

978 965 1095

1327 1134 1303

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

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

**Circuit 1 uses the lower por tion of condenser coil and lower por tion of evapora-

tor coils, and Circuit 2 uses the upper portion of both coils.

††Due to belt and pulley style, pulley cannot be set from 0 to 1

R-22

TXV

or Copper Plate Fins

Propeller Type

/2...1050 1...1075

Centrifugal Type

11/

17/

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

13/

17/

/2 turns open.

—6—

III. STEP 3 — FIELD FABRICATE DUCTWORK

3/4" FPT DRAIN CONNECTION

1-3/8" DRAIN HOLE

INDOOR FAN MOTOR ACCESS

FILTER ACCESS

Secure all duct s to bu ilding struct ure. Use fl exible duct con nectors between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and m asti c i n acc ordance with applicable codes.

Ducts passing through a n unc ondit i one d spa ce must be insulated and covered with a vapor barrier.

The 551A units with electric heat require a 1-in. clearance for the first 24 in. of ductwork.

Outlet grilles must not lie directly below unit discharge. NOTE: A 90-degree elbow must be provided in the ductwork

to comply with UL (Underwriters’ Laboratories) codes for use with electric heat.

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. Due to electric heater, supply duct will require 90 degree elbow.

IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS

Unit is shipped for thru-the-bottom duct conn ections. Ductwork openings a re shown in Fig. 6. Fi eld-fabricate d concentric ductwork may be connected as shown i n 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 — TRAP CONDENSATE DRAIN

See Fig. 4, 5, and 9 for 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 evaporator section for condensate drain connection. An 8 diameter nipple and a 2-in. x coupled to standard

/4-in. diameter pipe nipple are

/4-in. diameter elbows to provide a

/2 in. x 3/4-in.

straight path down through holes in unit base rails (see Fig. 10). A trap at least 4-in. deep must be used.

NOTE:

Do not drill in this area, as damage to basepan may result in

water leak.

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

(551A180 and 240 Shown)

Shaded area indicates block-off panels.

NOTE:

Dimension A, A′ and B, B′ are obtained from field-supplied ceil-

ing diffuser.

CAUTION:

units without electric heat. Personal injury or unit damage may result.

Concentric ducts may only be installed on

Fig. 8 — Concentric Duct Details

NOTE:

Do not drill in this area, as damage to basepan may result in

water leak.

Fig. 7 — Concentric Duct Air Distribution

(551A180 and 240 Shown)

Fig. 9 — Condensate Drain Details

(551A155 Shown)

—7—

Fig. 10 — Condensate Drain Piping Details

VI. STEP 6 — MAKE ELECTRICAL CONNECTIONS

A. Field Power Supply

Unit is factory wired for voltage sh own on nameplate. When installing units, provide a disconnect, per NEC

(National Electrical Code) requirements, of adequate size (Table 2). Electrical heater data is shown in Table 3.

All field wiring must comply with NEC and local requirements.

Route power lines through control box access panel or unit basepan (Fig. 4 and 5) to connections as shown on unit wiring diagram and Fig. 11.

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% and the current must be balanced within 10%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

Unit failure as a res ult of ope ra tio n o n imp ro per line volt age or excessive phase imbalance constitutes abuse and may cause damage to electrical components.

B. Field Control Wiring

Install a Bryant-approved accessory thermostat assembly according to the installation instruct ions 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 uni t to lowvoltage connections as shown on unit label wiring diagram and in Fig. 12.

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 to the thermos tat and wi ll req uire a j unction box and s plice a t the thermostat.

Set heat anticipator settings as indicated in Table 4. Settings may be changed slightly to pr ovide a greater degree of comfort for a particular installation.

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 m ay lead to premature compres sor failure.

Use the following formula to determine the percentage of voltage imbalance.

Percentage of Voltage Imbalance

= 100 x

max voltage deviation from average v oltage

average voltage

EXAMPLE: Supply voltage is 460-3-60.

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

Average Voltage =

455 + 464 + 455

1371

= 457

Determine ma ximum 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:

Percentage of Voltage Imbalance = 100 x

7 457

= 1.53%

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

UNIT 551A

All

EQUIP — GND — kcmil —

Equipment Ground Code Thousand Circular Mils

Fig. 11 — Field Power Wiring Connections

REMOVABLE JUMPER

RED

Fig. 12 — Field Control Thermostat Wiring

TB1 MAXIMUM WIRE SIZE

VOLTAGE

208/230 460

350 kcmil 2/0

LEGEND

NEC —

TB —

THERMOSTAT ASSEMBLY

Y1 Y2

BLU

UNIT LOW-VOLTAGE CONNECTIONS

W1Y2

PNK

National Electrical

Terminal Block

ORN

VIO

BLK

BRN

WHT

—8—

UNIT 551A

155

(Standard

IFM)

155

(Optional

IFM)

180

240

Table 2 — Electrical Data

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

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

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

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

VO LTAG E

RANGE

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

COMPRESSOR

No. 1 No. 2

OFM IFM

POWER

EXHAUST

—— — — 59/ 59 70/ 70

4.6 18.8 ——64/ 63 80/ 80 ——14/19 39/ 45 60/ 67 70/ 70

4.6 18.8 14/19 39/ 45 66/ 73 80/ 80

8.8/

8.4

——26/34 71/ 82 100/113 100/125

4.6 18.8 26/34 71/ 82 106/119 110/125 ——42/56** 117/135 157/146 175/175

4.6 18.8 42/56** 117/135 163/151 175/175 —— — — 29 35

2.3 6.0 —— 31 40 —— 15 18 29 35

2.3 6.0 15 18 31 40 —— 32 39 54 60

2.3 6.0 32 39 57 60 —— 55** 66 71 80

2.3 6.0 55** 66 74 80 —— — — 61/ 61 80/ 80

4.6 18.8 ——65/ 66 80/ 80 ——14/19 39/ 45 62/ 70 80/ 80

4.6 18.8 14/19 39/ 45 68/ 76 80/ 80

11.0/

10.5 ——26/34 71/ 82 102/116 110/125

4.6 18.8 26/34 71/ 82 108/122 110/125 ——42/56** 117/135 159/149 175/175

4.6 18.8 42/56** 117/135 165/155 175/175 —— — — 30 35

2.3 6.0 —— 32 40 —— 15 18 30 35

2.3 6.0 15 18 32 40 —— 32 39 55 60

2.3 6.0 32 39 58 60 —— 55** 66 72 80

2.3 6.0 55** 66 75 80 —— — — 82/ 82 110/110

4.6 18.8 ——86/ 86 110/110 ——26/34 71/ 82 109/122 110/125

15.8/

4.6 18.8 26/34 71/ 82 114/128 125/150

15.8 ——42/56 117/135 166/155 175/175

4.6 18.8 42/56 117/135 172/161 175/175 ——56/75** 156/180 176/200 200/225

4.6 18.8 56/75** 156/180 182/206 200/225 —— — — 41 50

2.3 6.0 —— 43 50 —— 32 39 59 60

2.3 6.0 32 39 62 70 —— 55 66 76 90

2.3 6.0 55 66 79 90 —— 80** 96 106 125

2.3 6.0 80** 96 109 125 —— — — 124/124 150/150

4.6 18.8 ——129/129 150/150 ——26/34 71/ 82 124/134 150/150

4.6 18.8 26/34 71/ 82 129/140 150/150

25.0/

25.0 ——42/56 117/135 178/166 200/175

4.6 18.8 42/56 117/135 183/172 200/175 ——56/75** 156/180 187/211 200/225

4.6 18.8 56/75** 156/180 193/217 200/225 —— — — 61 80

2.3 6.0 —— 63 80 —— 32 39 65 80

2.3 6.0 32 39 68 80 —— 55 66 82 90

2.3 6.0 55 66 85 90 —— 80** 96 112 125

2.3 6.0 80** 96 115 125

ELECTRIC

HEAT*

(See Legend on page 10.)

POWER

SUPPLY

—9—

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

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, and

†Fuse or HACR circuit breaker.

**Heaters are field installed only.

NOTES:

1. In compliance with NEC requirements for multimotor and combina-

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

480 v. Heaters are rated at 240 v, or 480 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

tion 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%.

of voltage imbalance. % Voltage Imbalance

= 100 x

LEGEND

Use the following formula to determine the percent

max voltage deviation from average voltage

average voltage

Example: Supply voltage is 460-3-60.

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

= 457

7 457

452 + 464 + 455

1371

Average Voltage =

Determine maximum deviation from average voltage.

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

(AC) 457 – 455 = 2 v Maximum deviation is 7 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

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

IMPORTANT:

contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) + (1.00 x heater FLA).

= 1.53%

If the supply voltage phase imbalance is more than 2%,

Table 3 — Electric Resistance Heater Data

UNIT

551A

*Maximum number of stages using accessory low-ambient kit or head pressure control device and low-ambient kit.

NOTE:

208 230 240 460 480 Cfm L/s 208 230 240 460 480

14 17 19 14 15 1 100 1

155

26 31 34 30 32 2 50/50 2 71.3 78.9 82.3 37.3 39.0 42 52 56 50 55 2 33/67 3 117.0 129.4 135.0 63.3 66.1 26 31 34 30 32 2 50/50 2

180

42 52 56 50 55 2 33/67 3 117.0 129.4 135.0 63.3 66.1 56 69 75 73 80 2 50/50 4 155.9 172.4 179.9 92.0 96.0 26 31 34 30 32 2 50/50 2

240

42 52 56 50 55 2 33/67 3 117.0 129.4 135.0 63.3 66.1 56 69 75 73 80 2 50/50 4 155.9 172.4 179.9 92.0 96.0

Heaters are rated at 240, and 480 v.

HEATER kW

Unit Voltages Heating Cfm

HEATER

STAGES

% HEAT

PER

STAGE

MAXIMUM

STAGES*

MINIMUM

39.3 43.4 45.3 17.2 17.9

3750 1770

71.3 78.8 82.3 37.3 39.0

3750 1770

71.3 78.8 82.3 37.3 39.0

5000 2360

HEATER AMPS

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C. Optional Non-Fused Disconnect

CONTROL MODULE

ACTUATOR

ECONOMI$ER

On units with the optional non-fused disconnect, incoming power will be wired into the disconnect switch. Refer to Fig. 13 for wiring for 100 and 200 amp disconnect switches. Units with an MOCP (maximum overcurrent protection) under 100 will use the 100 amp disconnect switch. Units with an MOCP over 100 will use the 200 amp disconnect switch. Refer to the applicable disconnect wiring diagram.

To prevent breakage during s hipping, the disconne ct han dle and shaft are shipped and packaged inside the unit control box. Install the disconnect handle before unit operation. To install the handle and shaft, perform the following procedure:

1. Open the co nt rol b ox do or and remove the handle and shaft from shipping location.

2. Loosen the Allen bolt located on the disconnect switch. The bo lt is locate d on the square hole and is used to hold the shaft in place. The shaft cannot be inserted until the Allen bolt is moved.

3. Insert the disconnect shaft into the square hole on the disconnect switch. The end of the shaft is specially cut and the shaft can only be inserted in the correct orientation.

4. Tighten the Allen bolt to lock the shaft into position.

5. Close the control box d oor.

6. Attach the handle to the external access door with the two screws provided. When the handle is in the ON position, the handle will be vertical. When the handle is in the OFF position, the handle will be horizontal.

7. Turn the handle to the OFF position and close the door. The handle should fit over the end of the shaft when the door is closed.

8. The handle must be in the OFF position to open the control box door.

D. Optional Convenience Outlet

On units with optional convenience outlet, a 115-v GFI (ground fault interrupt) convenience outlet re ce ptacle is provided for field wiring . F ield wir ing s ho uld be run th roug h th e

/8-in. knockout provided in the basepan near the return air

opening.

VII. STEP 7 — 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 dampe r to desired setting. Then retighten screws to secure damper (Fig. 14).

B. Optional EconoMi$er

EconoMi$er Motor Control Module (Fig. 15-17) Set the ECONSP dial to the ‘‘D’’ setting (Fig. 16). The control

module is located on the EconoMi$er motor. See Fig. 15 and

17. Damper Vent Position Setting

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

2. Set system selector switch to OFF position.

3. Turn Min Pos (%) dial slowly until dampers assume desired vent position. Do not manually operate

EconoMi$er motor since damage to motor will result.

Fig. 14 — 25% Outdoor-Air Section Details

6T3 4T2 2T1 LOAD

5L3 3L2 1L1 LINE

NOTE:

The disconnect takes the place of TB-1 as shown on the unit

wiring diagram label and the component arrangement label.

Fig. 13 — Optional Non-Fused Disconnect Wiring

Fig. 15 — EconoMi$er Damper Assembly

— End View

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