Fan runs without thermostat installed


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Old 04-26-17, 12:15 PM
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Fan runs without thermostat installed

Any ideas why indoor fan behaves this way. Have a Trane single packaged 3 ton heat pump that when the heat/cool switch set to off, the fan randomly cycles on for 40 sec and then off. This happens also when thermostat is not installed. If the switch is set to either heat or cool, the fan turns on and off with the cycles properly. Fan switch is set to Auto.
 
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Old 04-26-17, 02:51 PM
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The control board has a timer in it to circulate the air in the house. I'm sure you could disable it. What's the model number on the unit ?
 
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Old 04-27-17, 12:14 PM
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Thank you for responding. Model is WCX036G100B Trane/American Standard
 
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Old 04-27-17, 02:48 PM
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I don't come up with any thing with that model.
 
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Old 04-28-17, 08:56 PM
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Have ordered Trane air handler fan time delay relay, RLY02807.
 
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Old 04-28-17, 09:47 PM
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That appears to be a heat pump packaged unit.

I see the TDR in the parts listing but I don't see the relay in the wiring diagram... strange.
 
 

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