Atwood furnace problem..again
I have had to replace the motor and board on my front furnace twice and the board and burner tube on the rear once in the three years I have had this MH. Now the front unit,replaced in 3/12 is only b...
Forum Discussion
I need to boiler plate this, In fact I think I will.
WHat happens when heat is called for:
Thermostat calls for heat
Control board starts blower
Sail switch is closed by the force of blowen air on the "Sail".
Control board opens propane valve and starts making sparks (DSI)
Options 1 of 2
Control board continues ignition for brief (3 seconds?) time then looks for flame report (0.480 volts from flame sensor probe) (Same lead as ignition)
Option 2
Control board continues ignition and looks for flame report on separate flame sense lead.
If flame is sensed it shuts off the sparker.
In both cases.
If flame is sensed, operation continues till T-stat shuts down
If no flame is sensed, It tries again, and if needed again. Then locks out and fires up the FAULT light. (if you have one).
If it continues. When it gets hot enough the T-Stat says "ENOUGH already" and the flame is cut off (propane flow) followed by a brief cool down and shutting down of the blower.
If at any time the furnace gets too hot, OR the air flow is reduced to the cut off for the sail switch. IMMED shut down of flame.
WHat happens when heat is called for:
Thermostat calls for heat
Control board starts blower
Sail switch is closed by the force of blowen air on the "Sail".
Control board opens propane valve and starts making sparks (DSI)
Options 1 of 2
Control board continues ignition for brief (3 seconds?) time then looks for flame report (0.480 volts from flame sensor probe) (Same lead as ignition)
Option 2
Control board continues ignition and looks for flame report on separate flame sense lead.
If flame is sensed it shuts off the sparker.
In both cases.
If flame is sensed, operation continues till T-stat shuts down
If no flame is sensed, It tries again, and if needed again. Then locks out and fires up the FAULT light. (if you have one).
If it continues. When it gets hot enough the T-Stat says "ENOUGH already" and the flame is cut off (propane flow) followed by a brief cool down and shutting down of the blower.
If at any time the furnace gets too hot, OR the air flow is reduced to the cut off for the sail switch. IMMED shut down of flame.
