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

581B specifications

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