GMC 1975 Motorhome Operating Manual page 52

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Furnace Manual Valve and View Port
is satisfied or is turned to a lower setting . When
thermostat setting has been satisfied main burner
flame will go out but the blower will continue to
run for a short period of time and then shut off.
When vehicle has cooled, thermostat will re-light
furnace automatically .
Location of Furnace Reset Button and Fuse
46
REMINDER : The furnace should not be used when
the vehicle is underway, and the LP gas should
be turned off at the LP gas tank .
OPERATING FURNACE
This furnace has no pilot light, but is ignited
by an integral, solid state, direct-spark ignition
system. No manual lighting is required.
1. Set thermostat, located in rear of Motor
Home living area to "OFF" position .
NOTE : Be sure manual control valve at LP gas
tank
is
fully open (see page 80 for location of
valve) .
2. Open furnace manual valve fully, located
under sink at right side of furnace. Do not
attempt to operate furnace with valve partly
opened as proper operation depends on valve
being fully open.
3 . Set thermostat to desired setting, furnace
will energize and continue to run until thermo-
stat is satisfied or is turned to a lower setting.
NOTE : Refer to "FURNACE OPERATING
TIPS" if furnace fails to ignite.
SHUTTING OFF FURNACE
0
To shut off furnace set thermostat to "OFF"
position and close manual valve.
0
Always perform these steps as a precaution
when the furnace will not be in use.
FURNACE OPERATING TIPS
If furnace fails to ignite it may be necessary
to push the manual reset button, which is located
next to the fuse receptacle at the front of the
furnace-
1 . Turn thermostat to lowest setting.
2. Open LP gas tank valve.
3. Open main furnace valve .
4. Press manual reset button on furnace .
5. Turn thermostat to a temperature above
room temperature . Furnace should start.
NOTE : A rumbling or growling noise is not
normal . Refer to "PRIMARY AIR ADJUST-
MENT" if this occurs.

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