3. Blower Motor Speed Selection

All installations and services must be performed by qualified service personnel.

Or in this case,

_2.5 A. = 0.25 A. (Anticipator Setting) 10

iv.Adjust the position of the anticipator indicator to match the calculated ammeter setting. If a slightly longer cycle is desired, the pointer should be moved to a higher setting. Slightly shorter cycles can be achieved by moving to a lower setting.

v.Remove the meter jumper wire and reconnect the thermostat. Check the thermostat in the heating mode for proper operation.

If a digital ammeter is used, read the current draw directly from meter. (Steps 1 through 3 are not required.) The meter reading is the correct anticipator setting.

3. Blower Motor Speed Selection

Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background: Turn off the electrical power to the unit, before attempting to change supply air blower speed wiring.

The OPB comes from the factory with the proper cooling speed selected and the heat rise set to approximately 65°F on low-fire.

The heat rise is determined by the nozzle size and the switch selection on the control board located in the vestibule compartment.

Switches 1, 2 & 3 of switch block SW1 (the six switch red block) are used to select the proper blower speed. Please refer to the table below:

FACTORY SET

SW1 POSITION

 

 

1

2

3

LOW-

HIGH FIRE

FIRE

HEAT RISE

OFF

OFF

OFF

 

 

ON

OFF

OFF

 

 

OFF

ON

OFF

74

 

ON

ON

OFF

67

 

OFF

OFF

ON

64

 

ON

OFF

ON

 

73

OFF

ON

ON

 

67

ON

ON

ON

 

60

OPERATION IN THIS RANGE MAY FORCE THE SAFETY LIMIT TO OPERATE REDUCING PERFORMANCE

OPERATION IN THIS RANGE MAY CAUSE COMBUSTION GASES TO CONDENSE AND VOID THE WARRANTY

30

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Thermo Products 36)- 80, OPB (24, 30 service manual Blower Motor Speed Selection