Appliances
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S I G N A T U R E
4 • 1 1 7
The roof air conditioners operate from 120 Volts AC only, either by shore
power or the generator. Operations are controlled by the12 Volt DC comfort
control. The electronics in the comfort control use a telephone type patch cord
to send a low voltage signal to the roof air conditioner’s circuit board. The cir-
cuit board controls the desired roof air functions and LP-Gas furnace or (if
equipped) Aqua Hot operation. The refrigerant operation principal of the roof
air conditioner is the same as the dash air conditioner or a household type
refrigerator. It functions as an enclosed system. The refrigerant is drawn into
the compressor. The high pressure vapor is sent to a condenser where the heat is
expelled into the atmosphere. The vapor leaves the condenser as a high pressure
liquid. This liquid is forced into a metered capillary tube and then into the evap-
orator or low side pressure. The refrigerant changes from liquid form to vapor
as the heat is extracted. The vapor is drawn back into the compressor to start
the cycle again. The air conditioning principal is reversed when operating the
roof air conditioner in heat pump mode. The refrigerant flow is reversed blow-
ing heated air into the interior of the motorhome. There are ambient tempera-
ture limitations of the heat pump mode
NOTE: The air conditioning system will freeze the moisture in the air
depending on the humidity content. Under high humidity conditions it is
recommended to set the blower fan speed to High.
NOTE: The roof air conditioner will not operate in Heat Pump mode with
ambient temperatures at or below 26º F.
Aux Heat Mode
If the heat pump mode is selected when ambient temperatures are approxi-
mately 26° F, or if operating in Heat Pump mode and temperature drops to
approximately 26º F, the air conditioner will stop Heat Pump operation and Aux
Heat operation will begin. The furnace is automatically selected as an auxiliary
heat source and begins operation.The Aux Heat mode is automatically selected
due to refrigerant characteristics in cold temperatures. The furnace remains the
primary heat source until ambient temperature rises above 42º Fahrenheit.
When ambient temperature is between 24-42º Fahrenheit, a defrost cycle is ini-
tiated approximately every 40 minutes of compressor operation. The blower
motor will stop for five minutes and Defrost will be displayed. After the defrost
cycle Heat Pump operation will resume.
If the motorhome is equipped with an Aqua Hot and the Aux Heat cycle is
initiated the Aqua-Hot will need to be turned ON by using the Aqua Hot control
switches located in the galley. The living room and dinette heat exchanger
blowers will automatically begin operation. Use the bedroom comfort control to
select Zone One or Zone Two heat exchangers.
The return air filters should be cleaned frequently. They are located on the
motorhome ceiling inside the air intake vent covers. Never run the air condi-
AIR CONDITIONER -
ROOF
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