Roof-Mounted Air Conditioner - GMC 1977 motorhome Operating Manual

sun . The opening of a ceiling vent and a window
will aid in removing condensation from the
windows .
The vents are crank-operated from inside the
Motorhome . In rainy weather it is possible to
leave the ceiling vents open slightly for ventila-
tion without entry of water into the Motor-
home (depending upon the magnitude and di-
rection of rain) .
NOTE : All
windows and roof vents must be
tightly closed when operating the air condi-
tioner or furnace to obtain maximum cooling
or heating .
Power fans are available for the ceiling vents.
These will increase the efficiency of the vent.
They are operated by the button switch at the
corner of the vent.
ROOF MOUNTED AIR CONDITIONER
The controls of the air conditioner are
mounted on the unit in the ceiling of your
Motorhome and can provide either cooling or
air circulation .
To operate the unit for air circulation, set the
blower fan switch at the desired setting :
Hi Fan . . . . . . . . . . High Fan Speed Only
Med . Fan . . . . . Medium Fan Speed Only
Low (Lo) Fan . . . . Low Fan Speed Only
To operate the unit for cooling set the
thermostat and the blower fan switch at the de-
sired settings
Hi Cool . . . . High Fan Speed with Cooling
Med. Cool . . . . . . . . . Medium Fan Speed
with Cooling
Low (Lo) Cool . . . . . . . . Low Fan Speed
with Cooling
Air distribution to the vents on the Duo-.
Therm unit is controlled by the air distribution
knob. Louvers on each vent can be adjusted to
the desired position.
The unit is shut down by placing the blower
switch in the "OFF" position . The Duo-Therm
unit is equipped with a delayed start feature.
When the unit is turned on, the fan will start,
5 1
Window Latch (Locked)
Duo-Therm Air Conditioner Controls
and in approximately two minutes the compres-
sor will start . After shut down, unit will not start
for approximately two minutes .
The air filter must be checked and cleaned
frequently as required by use . Wash filter in
warm soapy water, rinse, shake off excess water
and allow to dry . (Do not use compressed air to
dry filter.)