Bryant 581B Nominal Voltage Combustion Minimum Unit Compressor, RLA LRA FLA MCA MOCP², Hacr, Ifm

Page 11

High-Voltage Connections (Fig. 13)

The unit must have a separate electrical service with a ®eld- 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.

The ®eld-supplied disconnect switch box may be mounted on the unit over the high-voltage inlet hole in the control corner panel.

Proceed as follows to complete the high-voltage connections to the unit:

1.Connect ground lead to chassis ground connection when using separate ground wire.

2.Pigtails are provided for ®eld power connection. Use factory-supplied splices or UL (Underwriters'

Laboratories) approved copper connector. Install con- duit connectors in side panel power supply knockout openings indicated in Fig. 2. Route power lines through connector to unit control box.

Special Procedures for 208-V Operation

DANGER: Make sure that the power supply to the unit is switched OFF before making any wiring changes. Electrical shock can cause personal injury or death.

For operation on 208 v, disconnect the black wire from the 230-v orange wire on the transformer and connect it to the 200-v red wire from the transformer. Insulate the end of the orange wire.

Table 3A Ð Electrical Data (Units Without Electrical Convenience Outlet)

 

NOMINAL

VOLTAGE

 

 

 

 

COMBUSTION

 

 

MINIMUM UNIT

UNIT

COMPRESSOR

OFM

IFM

POWER SUPPLY

DISCONNECT

VOLTAGE

RANGE

FAN MOTOR

581B

 

 

 

 

 

 

 

SIZE*

(V-Ph-Hz)

 

 

 

 

 

 

 

 

 

 

 

Min

Max

RLA

LRA

FLA

FLA

FLA

MCA

MOCP²

FLA

 

LRA

 

 

 

 

208/230-1-60

187

254

16.0

88.0

0.7

4.9

.57

25.6/25.6

35/35

25/25

 

101/101

036

208/230-3-60

187

254

10.3

77.0

0.7

4.9

.57

18.5/18.5

25/25

18/18

 

90/ 90

(3 Tons)

460-3-60

414

508

5.1

39.0

0.4

2.2

.30

9.0

15

9

 

46

 

575-3-60

518

632

4.2

31.0

0.4

2.2

.30

7.3

15

7

 

37

 

208/230-1-60

187

254

23.7

129.0

0.7

4.9

.57

35.2/35.2

45/45

34/34

 

142/142

048

208/230-3-60

187

254

13.5

99.0

0.7

4.9

.57

22.5/22.5

30/30

22/22

 

112/112

(4 Tons)

460-3-60

414

508

7.4

49.5

0.4

2.2

.30

9.7

15

12

 

57

 

575-3-60

518

632

5.8

40.0

0.4

2.2

.30

9.3

15

9

 

46

 

208/230-1-60

187

254

28.8

169.0

1.5

8.8

.57

46.3/46.3

60/60

45/45

 

216/216

060

208/230-3-60

187

254

17.3

123.0

1.5

5.8

.57

29.0/29.0

35/35

28/28

 

168/168

(5 Tons)

460-3-60

414

508

9.0

62.0

0.8

2.6

.30

14.7

20

14

 

84

 

575-3-60

518

632

7.1

50.0

0.8

2.6

.30

11.6

15

11

 

59

072

208/230-3-60

187

254

20.5

156.0

1.4

5.8

.57

32.8/32.8

40/40

32/32

 

200/200

460-3-60

414

508

9.6

70.0

0.6

2.6

.30

15.2

20

15

 

92

(6 Tons)

 

575-3-60

518

632

7.7

56.0

0.6

2.6

.30

12.2

15

12

 

74

 

 

 

LEGEND

FLA

Ð Full Load Amps

HACR

Ð Heating, Air Conditioning and Refrigeration

IFM

Ð Indoor (Evaporator) Fan Motor

LRA

Ð Locked Rotor Amps

MCA

Ð Minimum Circuit Amps

MOCP Ð Maximum Overcurrent Protection

NEC

Ð National Electrical Code

OFM

Ð Outdoor (Condenser) Fan Motor

RLA

Ð Rated Load Amps

UL

Ð Underwriters' Laboratories

*Used to determine minimum disconnect per NEC. ²Fuse or HACR circuit breaker.

EXAMPLE: Supply voltage is 460-3-60. AB = 452 v

BC = 464 v AC = 455 v

452 + 464 + 455

Average Voltage =

3

1371

=

3

= 457

Determine maximum deviation from average voltage. (AB) 457 ± 452 = 5 v

(BC) 464 ± 457 = 7 v

(AC) 457 ± 455 = 2 v Maximum deviation is 7 v.

Determine percentage of voltage imbalance:

% Voltage Imbalance = 100 x

7

NOTES:

1.In compliance with NEC requirements for multimotor and combina- tion load equipment (refer to NEC Articles 430 and 440), the over- current protective device for the unit shall be fuse or HACR breaker. The CUL 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- age of voltage imbalance.

max voltage deviation

%Voltage Imbalance = 100 x from average voltage average voltage

457

= 1.53%

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

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

3. 575-v units are UL, Canada approved only.

Ð11Ð

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Contents Safety Considerations Important Ð Read Before InstallingContents Connection Sizes Standard Varislide Corner Unit Economizer WeightThreaded Wire Required Sizes Conduit USE Maximum Roof Curb Mount InstallationLocate the Unit ClearanceUnit Size AccessoryService Plate Sizes Connector Unit Roof Curb581B 036 Unit MAX Dimensions WeightII. Unit Duct Connections III. RIG and Place UnitBase Unit 581B SpecicationsGas Piping Fig Install Flue HoodIV. Field Connections External Trap Condensate DrainNominal Internal Length of PIPE, FT Iron Pipe Diameter Size Electrical Connections Field Duct ConnectionsIFC CompEquip GNDHacr Power Supply Disconnect Voltage Range FAN MotorNominal Voltage Combustion Minimum Unit Compressor RLA LRA FLA MCA MOCP²Thermostat List Ð Electrical Data Units with Electrical Convenience OutletOptional Varislide Economizer Typical Access Panel Locations Accessory InstallationExample Optional Parablade EconomizerOutdoor-Air Thermostat/Enthalpy Control Installation Parablade Economizer Installed in Unit START-UP Compressor Rotation PRE-START-UPII. Heating Section START-UP and Adjustments Orifices Rated Gas Inputs at Indicated Manifold PressuresAltitude Compensation* Ð Units 581B036-072 PressureRollout Switch Air¯ow and Temperature RiseSafety Check of Limit Control Limit SwitchesUnit Controls III. Cooling Section START-UP and AdjustmentsChecking and Adjusting Refrigerant Charge Checking Cooling Control OperationBelt Drive Motors IV. Indoor Airflow and Airflow AdjustmentsEvaporator Fan Motor Data Fan Rpm at Motor Pulley SettingsVentilation Sequence 581B048 Air Delivery Ð Vertical Discharge Units 581B036 Air Delivery Ð Vertical Discharge Units581B072 Air Delivery Ð Vertical Discharge Units 581B060 Air Delivery Ð Vertical Discharge Units581B048 Air Delivery Ð Horizontal Discharge Units 581B036 Air Delivery Ð Horizontal Discharge Units581B072 Air Delivery Ð Horizontal Discharge Units 581B060 Air Delivery Ð Horizontal Discharge UnitsAIR Filter Service CleaningCare and Maintenanmce Refrigerant Charge IV. Economizer AdjustmentII. Lubrication VIII. COMBUSTION-AIR Blower VI. Main BurnersVII. Flue GAS Passageways Burner Ignition IX. Limit SwitchLED Error Code Description LED Indication Error Code DescriptionXI. Replacement Parts Removal and Replacement of Gas Train SeeCleaning and Adjustment Problem Cause Remedy TroubleshootingLED Error Code Service Analysis Heating Service AnalysisCooling Service Analysis SAT Varislide Economizer TroubleshootingOAT Or close according to Parablade Economizer TroubleshootingDamper does not open Damper does not closeTypical Wiring Schematic and Component Arrangement Component Arrangement Page III. START-UP Electrical START-UP ChecklistTemperatures Preliminary Information
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581B specifications

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