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Machinc
Machinc, General Contractor
Category: HVAC
Satisfied Customers: 913
Experience:  Has written home improvement articles since 2008. Earned South Carolina Residential Builders License in 1991.
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MY air handler fan motor has a time delay circuit board that

Customer Question

MY air handler fan motor has a time delay circuit board that is told by the thermostat to come on. Can this time delay relay circuit board be bypassed and the fan motor started and stopped another way?
Submitted: 1 year ago.
Category: HVAC
Expert:  Machinc replied 1 year ago.

I will have your answer in one moment

Expert:  Machinc replied 1 year ago.
Changing the fan delay would not be advisable .
Delay is designed for different reasons
The delay on start up prevents cold air or warm air " depending on the season " from being turned on
prematurely.. The fan turns on first.
When when the unit turns off is just the opposite the fan shuts off last.
Oh shut off if the fan is stopped before the auxiliary heat strips cool down they may be damaged..
This is just a two of the reasons why you should not change the timing or delay of the fan.
The fan and the heat and cooling source are designed to work in sequence with each other and subtle changes could possibly cause major problems. It best to leave the system the way that it was factory designed.
Machinc
Expert:  Machinc replied 1 year ago.
NOTE/ there are various reasons for noises when the fan cuts on or off
Sometimes the sheet-metal in the ductwork or in the unit reflexes at start up or shutdown causing noise.
This can be caused by clogged are dirty filters or poor design of the system .
A mistake in design or set up like incorrect air flow can be tested and corrected by a prodessional HVAC technician.
Before calling for service check for debris or leaves etc. that might've gotten into the unit.

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