Bryant 581B Ventilation Sequence, Fan Rpm at Motor Pulley Settings, Evaporator Fan Motor Data

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B. Ventilation Sequence

If unit is equipped with an economizer, the damper will open to the minimum position whenever the evaporator fan runs.

The damper motor will be energized with 24 vac power and damper will drive open until SW3 on the damper is de- activated. The damper motor will stop and damper will remain in the minimum ventilation position until the evapo- rator fan is shut off. When the evaporator fan is shut off, the damper motor is again energized and the damper runs closed until SW2 is activated and the damper motor turns off.

When unit is equipped with an economizer, additional out- door air can be brought in through the damper to provide

cooling. If the unit calls for cooling and the outdoor-air tem- perature is below the outdoor-air thermostat (OAT) setting or the outdoor-air enthalpy is below the enthalpy control (EC) setting, the damper motor starts. The damper drives open until it reaches full open and SW1 is activated. When SW1 is deactivated, the damper motor stops. When the cooling load is satis®ed, or outdoor air is no longer below the OAT or EC setting, the damper returns to the minimum position.

If the supply-air thermostat (located on the evaporator-fan housing) senses a supply-air temperature less than 50 F, the damper closes until the supply-air temperature is above 50 F.

Table 7 Ð Fan Rpm at Motor Pulley Settings*

UNIT

 

 

 

 

 

MOTOR PULLEY TURNS OPEN

 

 

 

 

 

581B

0

1¤2

1

11¤2

2

 

21¤2

3

31¤2

 

4

41¤2

5

51¤2

6

036

1090

1055

1025

990

960

 

925

890

860

 

825

795

760

Ð

Ð

048

1185

1150

1115

1080

1045

 

1015

980

945

 

910

875

840

Ð

Ð

060

1460

1425

1385

1350

1315

 

1275

1240

1205

 

1165

1130

1095

1055

1020

072

1585

1540

1490

1445

1400

 

1350

1305

1260

 

1210

1165

1120

Ð

Ð

*Approximate fan rpm shown.

Table 8 Ð Evaporator Fan Motor Data

UNIT

 

MAXIMUM

UNIT

MAXIMUM

PHASE

CONTINUOUS

AMP

581B

VOLTAGE

 

BHP*

DRAW

 

 

 

 

Single

1.20

208/230

5.4

036

 

 

208/230

5.4

Three

1.20

460

2.4

 

 

 

 

575

2.4

 

Single

1.20

208/230

5.4

048

 

 

208/230

5.4

Three

1.20

460

2.4

 

 

 

 

575

2.4

 

Single

1.80

208/230

9.7

060

 

 

208/230

6.4

Three

1.80

460

2.9

 

 

 

 

575

2.9

 

 

 

208/230

6.4

072

Three

2.40

460

2.9

 

 

 

575

2.9

LEGEND

Bhp Ð Brake Horsepower

*Extensive motor and electrical testing on these units ensures that the full horsepower range of the motors can be utilized with con®dence. Using your fan motors up to the ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

Ð23Ð

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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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