Dometic Thermostat mod
First off I want to say thanks to all those here that advised me on this and to make clear this is not my invention just my variation of someone else's idea.
The problem we were having was waking up at 3 am with cold air blowing on us because the AC fan was a constant on .
We had already replaced the furnace thermostat with a more accurate digital one ($10, on sale at Menards) so we were half done from the start .
This is the control on the AC:
An this is the new furnace thermostat we wanted to use:
This is the relay we added that the new thermostat controlled with a single wire pulled from the thermostat to the relay (plus a ground wire)
The AC is set on coldest,and the fan speed selected.
The wall thermostat provides 12 volt DC to operate the relay.
The 25 amp contacts on the relay (normally open) are wired in series with the AC breaker.
The thermostat on the wall calls for cooling,sends 12 volts to the relay coil, the contacts close and 120 volts is sent to the air conditioner .
The fan speed can still be changed by turning the dial on the air conditioner.
When the preset temperature on the thermostat is reached the relay opens and the AC (and it's fan ) shuts off.
No more waking up at 3 AM with a cold fan blowing on us, and the total cost was less than $25.
The kits sold to do this run $100 plus shipping .
The problem we were having was waking up at 3 am with cold air blowing on us because the AC fan was a constant on .
We had already replaced the furnace thermostat with a more accurate digital one ($10, on sale at Menards) so we were half done from the start .
This is the control on the AC:
An this is the new furnace thermostat we wanted to use:
This is the relay we added that the new thermostat controlled with a single wire pulled from the thermostat to the relay (plus a ground wire)
The AC is set on coldest,and the fan speed selected.
The wall thermostat provides 12 volt DC to operate the relay.
The 25 amp contacts on the relay (normally open) are wired in series with the AC breaker.
The thermostat on the wall calls for cooling,sends 12 volts to the relay coil, the contacts close and 120 volts is sent to the air conditioner .
The fan speed can still be changed by turning the dial on the air conditioner.
When the preset temperature on the thermostat is reached the relay opens and the AC (and it's fan ) shuts off.
No more waking up at 3 AM with a cold fan blowing on us, and the total cost was less than $25.
The kits sold to do this run $100 plus shipping .
