Air Conditioner - Roof - Holiday Navigator 2003 Owner's Manual

Appliances
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AIR CONDITIONER -
ROOF
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The roof air conditioners operate from 120 Volts AC only, by shore power
or the generator. Operations are controlled by the 12 Volt DC comfort control.
The electronics in the comfort control use a telephone style patch cord to send
low voltage signals to the roof air conditioner's circuit board. The circuit board
controls the desired roof air functions and Aqua-Hot blower operation. The
refrigeration 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 compressor pumps refrigerant into a condenser as high-
pressure vapor. A condenser expels heat from the vapor into the atmosphere.
Vapor condenses to high-pressure liquid. The liquid is forced through a
metered capillary tube and then into the evaporator or low side pressure. The
refrigerant changes from liquid to vapor as the refrigerant extracts heat. The
compressor pumps the vapor to the condenser repeating the cycle. Operating
the air conditioner in Heat Pump mode reverses the cycle. Reversing the
refrigerant flow blows heated air into the interior of the motorhome. There are
ambient temperature operating limitations in Heat Pump mode.
NOTE: The air conditioning system freezes moisture in the air. It is
recommended to set the blower fan speed to high when operating in
high humidity.
NOTE: There are ambient air temperature limitations in Heat
Pump mode. The roof air conditioner will not operate in Heat Pump
mode with ambient temperatures of 30º F and below.
Aux Heat Mode:
If the Heat Pump mode is selected when ambient temperature is approximately
30° F, or if operating in Heat Pump mode and temperature drops to approximately
30º F, the air conditioner will stop Heat Pump operation and Aux Heat
operation begins. Aux Heat mode selects the furnace as the auxiliary heat
source. Aux. Heat mode initiates automatically due to refrigerant limitations in
cold temperatures. The furnace remains the primary heat source until ambient
temperature rises above 30º F. When operating in Heat Pump mode with ambient
temperature between 30 to 42º F, a defrosting cycle begins approximately
every 40 minutes of compressor operation. During the defrost cycle, the blower
motor will stop for five minutes and the display will indicate Defrost. After
the defrost cycle Heat Pump operation will resume.
If equipped with an Aqua-Hot this will need to be on when the Aux Heat
cycle begins. Turn on the Aqua-Hot control switches. The exchanger blowers
automatically begin operation in the Auxiliary Heat mode.
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