Airstream Excella 1975 Owner's Manual page 67

4. Remove the lighter hole cover (B).
5. Depress the reset button (C) and hold it in.
6. Light the pilot by pressing quickly on the
ignition button (D), or with a match.
7. After the pilot is lit, keep the reset button
depressed for thirty seconds.
8. Release the reset button and the pilot
should remain lit.
If the pilot goes out, repeat the above steps
keeping the reset button depressed for a
longer period of time. The pilot may not light
immediately due to the presence of air in the
gas line. It may be necessary to hold the reset
button in for a minute or more before the
pilot ignites. Replace the lighter hole cover
(B) as soon as the pilot is lit and close the
front access door and set the thermostat (A).
If the furnace has just gone out, turn the
manual gas valve off and wait 5 minutes
before attempting to relight the pilot.
Differences in pressure between the room air
and the outside air may cause a strong draft
to come through the furnace once the lighter
hole cover is removed. Opening a window or
the door on the same wall as the furnace
while lighting the pilot will prevent this from
happening. Differences in inside and outside
temperature will have no effect on furnace
operation once the lighter hole cover (B) has
been replaced.
Adjustment of Main Burner (Primary Air):
Set the furnace into operation by advancing
the thermostat and allow to run until it
reaches near-maximum operating tempera¬
ture. Observe the main burners through the
lighter hole cover (B). The flame should be
without a trace of yellow and be "sitting" on
the burner. As the furnace was tested at the
factory before shipment, it may be found that
the primary air is already in proper adjust¬
ment. However, adjustments may vary from
one location to another due to differences in
elevation and in characteristics of the fuel
gases.
If the flame burns yellow or "lifts" off the
burner, it needs adjustment. Take out the
screws retaining the rectangular cover plate
(E) and lift the plate off. Inside the opening is
a threaded rod with the visible end slotted to
receive a screwdriver. By turning the rod you
will adjust the position of the main burner air
shutter. This air shutter should be adjusted to
the point where a slight trace of yellow
remains in the tip of the flame. Replace the
cover and check that the yellow tips have now
disappeared. Caution: the lighter opening
cover and the primary air adjustment cover
plate must be in place for proper operation of
the furnace.
The most common cause of furnace failure is
pilot outage, the inability of the pilot to stay
lit unless the reset button is depressed. The
trouble is usually in the thermocouple, which
is located inside the cover plate near the pilot
light. Check to see that the end of the
thermocouple lead is screwed firmly into the
safety pilot valve and that the joint is clean.
The furnace can be used to circulate air
during hot weather by shutting off the gas
valve and turning the thermostat (A) up
higher than the temperature in the trailer.
Return the thermostat to the "OFF" setting
whenever the furnace is not in use.
When the humidity is high inside your trailer
and you wish to remove moisture, open a roof
vent and turn on a vent or open a window
slightly for cross ventilation.