Thermostat or Furnace!!!

[dspowers]

my1982 HR has SUPER HEAT by SUBURBAN. The thermostat controls the blower?? When we move the thermo nothing happens, we have the 110v plugged to power. The 12v battery calls for two batteries we only have one, does this have impact on the heater? will the heater not run on 110v??

[TXiceman]

The normal start sequence is for the thermostat to close which starts the bloer which will clear the combustion chamber and after a time-out period, the gas valve will open and the flame ignition will start to fire ( provided it is DSI, Direct Spark Ignition). The flame fires and heats a thermocouple. Two things can keep the furnace from firing at this time. The thermocouple does not get hot enough or is bad and will shut down the system. Next, the air stream from the blower has a sail-switch that has to lift enough to make the contact or the flame will not ignite.

The furnace motor is 12 VDC (volt direct current) and will generally require a minimum of about 10.8 VDC at the blower motor to run. Any lower and the blower will not get up to speed, make the sail switch and on some, the controls will not function on lower voltages.

One charged 12 volt battery should run the furnace. Check the battery for voltage and also make sure the charger circuit in the power converter is putting out 12.8 to about 13 volts. These number will vary slightly due to differnt specifications.

Also check to see if the furnace motor is well grounded.

Post which model Suburban model furnace you have and if it is the original one or not?

[ahicks]

Quote:

Originally Posted by dspowers my1982 HR has SUPER HEAT by SUBURBAN. The thermostat controls the blower?? When we move the thermo nothing happens, we have the 110v plugged to power. The 12v battery calls for two batteries we only have one, does this have impact on the heater? will the heater not run on 110v??

The furnace should run fine with the coach plugged in. On one battery, it'll be a question of how long it will run, not "if".

There's a small on-off switch located on the bottom of many thermostats. That may be turned off?

[dspowers]

The model NT-30H that Im not sure if original but according to floorplans and specs 30M BTU input suburban electronic ignition furnace is listed. I checked the wires, one red and one white and the red is hot! now when I manually force touch thermostat the blower works, im chargin the battery over nite to see if this will help. Thanks