C7XR7 wrote:
No, this is not a "normal" set up.
With the furnace you need to have the fan set to AUTO, this is because the heat exchanger in a gas unit needs to heat up to a certain temperature prior to engaging the fan so that it does not blow cold air on you. Secondly the gas will shut off when the thermostat is satisfied but the heat exchanger needs to cool to a certain temperature before the fan shuts off. Not the same for electric heat.
Older (much older) style furnaces the propane fired off and then a temp switch turned fan on.
NOT anymore........
T-stat calls for heat
Fan comes on to 'purge' combustion chamber AND makes up a 'sail switch' which then allows DC voltage to flow for circuit board to open gas valve/ignition occur.
Fan continues to run after t-stat opens to cool heat exchanger down.
Safety devices/operating scheme!
CMunrock wrote:
My fifth wheel has two temp controllers. One has a digital display that controls my A/C and blower. This thermostat also controls my gas furnace.
The other thermostat is the type that I've had on other RVs, with the manual slider on the top.
AS suggested by Chris Bryant....
The 'other' t-stat most likely is for a roof vent....fantastic vent that is temp controlled.
The digital t-stat would be for A/C Unit AND Furnace
Set FAN to 'Auto' and then only furnace will operate when you 'heat' vs having A/C Unit Fan run also.
