Another digital thermostat question
Ok everybody...I'm pretty new and I know this has been covered quite a bit, but I just wanted to throw this out there. I have a 2014 StarCraft AR-ONE 16 BH. We did some colder weather camping this...
Forum Discussion
scout266 wrote:
Yeah that makes sense I'm just trying to figure out why one of the wires going into the thermostat comes from the 12 V DC batt.
Because that 12V DC is used to trigger furnace fan.
1.The Thermostat calls for heat, sending DC current to the furnace.
2.A Time Delay Relay is energized and passes battery DC power to the blower motor. (can be a stand alone component OR timer on circuit board)
3.The blower motor and fans spin, pulling air from the Air Return and generating a stream of air through the Heat Exchanger and out the Ducts. At the same time another fan pulls air from the Combustion Air Intake into the Combustion Chamber and out the Exhaust.
4.The fan air stream causes the Sail switch to close as the blower gets near full speed.
5.Power flows to the High Limit Switch and onward to the Control Circuit Board.
6.The Control Circuit Board opens the gas valve and generates a spark at the DSI Igniter.
7.The Burner ignites, building heat in the Combustion Chamber.
8.Heat passes through the Heat Exchanger, warming the air circulating through the Ducts.
9.The Thermostat reaches the Set Temperature and opens.
10.Power is removed from the Control Board and the Burner shuts down.
11.The fan continues to run to cool the furnace, until the Time Delay Relay opens again. (or timer on circuit board times out)
