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Armstrong 4PHP13E36P runs after heating element cools

I need to know where to adjust the length of time that an Armstrong 4PHP13E36P-1A blower runs after the heating element shuts off. The unit blows cold air into the house after the heat stops, which cools the house, causing the thermostat to start the whole cycle again. This is clearly wasting energy and wearing out our unit prematurely.

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  • peyton thompson
    peyton thompson May 11, 2010

    the time is preset on the fan relay if the fan is not shutting off after 1-2 minutes then the fan relay is bad and needs to be replaced.

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There may be pins on the circuit board inside the air handler that you can adjust. First turn off the breaker then look inside at the board. They may say 30-45-60-90 etc. Put the pin on a lower number. Do you have a digital or programmable T-stat? There may be a setting in the T-stat setup program that allows for blower delay also. consult you installation instructions. Last if the blower isn't turning off at all then the relay on the circuit board is stuck closed and should be replaced.

Posted on Mar 10, 2009

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If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


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Model: REG-123H
  • UPC: 855326002968
  • Product Type: 12,000 BTU Window Air Conditioner & Heater
  • Product Dimensions: L: 24.00" x W: 24.00" x H: 16.00"
  • Product Weight: 88.00 lbs.
  • Product Color: White
  • Application: Used to cool individual rooms
  • Type: Window Air Conditioner
  • Warranty: 1 year; 5 years sealed system
  • Coverage Area: 550 square feet
  • Voltage: 230 volts
  • Heater: Yes
  • Air Flow: 266 CFM
  • Amps: 5.5 amps
  • Heating Capacity: 11000 BTUs
  • Frequency: 60 Hz
  • Cooling Capacity: 12000 BTUs
  • Dehumidifying Capacity: 3.6 pints
  • EER: 9.8
  • Heat Pump: No
  • Number of Fan Speeds: 3
  • Programmable Timer: Yes
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  • Refrigerant Type: R-410A
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  • Energy Star Rated: No
  • Air Filter: Yes
  • Built-In Air Purification System: No
  • Display Type: Digital
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  • Adjustable Side Panels: Yes
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