HEATING AND COOLING
THOR MOTOR COACH | MADE TO FIT
95
13
Basic Air Conditioner Operation
e following basic instructions pertain to all air condition-
er installations, regardless of the control device (multiplex
panel, wall-mounted thermostat, or on-unit control panel).
1. Turn ON the Master Battery Disconnect Switch. is
will provide 12 volts DC to the control system of the
air conditioner.
2. Turn ON the generator OR connect the motorhome
to a shore power source (refer to Electrical System,
Section 10). is will provide 120 volts AC to the air
conditioner’s compressor and fan.
COOLING
1. Turn the selector switch (if applicable) to the LOW
COOL or HIGH COOL positions.
2. Rotate, slide, or move the thermostat (temperature
control) to the desired interior temperature setting.
e thermostat will turn the compressor on when the
temperature of the air entering the air conditioner rises
a few degrees above the setting you have selected. e
thermostat will continue to cycle the compressor on
and o in the above mentioned fashion until the selec-
tor switch is turned to another mode of operation.
3. Position the louvers to the desired direction of air ow.
OPERATION DURING COOLER NIGHTS
When the outdoor temperature drops in the evening or
during the night to below 75 degrees F., it is important that
the thermostat (temperature control) be set at a midpoint
between WARMER and COOLER. If the setting is at
COOLER, the evaporator coil may become iced-up and
stop cooling. During the day when the temperatures have
risen above 75 degrees F., reset the thermostat switch to the
desired setting.
NOTE: Should icing-up occur, it is necessary to let
the cooling (evaporator) coil defrost before normal
cooling operation is resumed. During this time, oper-
ate the unit in the ‘High Fan’ position with the system
at maximum air flow. When increased or full air flow
is observed, the cooling coil should be clear of ice.
Roof-mounted low-
profile heat pump.
Exterior cover may
be white or black.
AIR CIRCULATION ONLY
• Turn the selector switch to LOW FAN or for maximum
air ow, HIGH FAN.
• Position the louvers to the desired direction of air ow.
SHORT CYCLING
When an air conditioner is in operation, its compressor
circulates refrigerant under high pressure. Once o, it will
take two to three minutes for this high pressure to equalize.
e air conditioning compressor is unable to start against
high pressure. erefore, once the air conditioner is turned
o, it is important to keep it o for two to three minutes
before restarting.
Short cycling the compressor (or starting it before pres-
sures have equalized), will in some instances, trip the
circuit breaker.
Heat Pumps
Select TMC motorhomes are equipped with roof-mounted
heat pumps. Heat pumps provide both cooling and supple-
mental cabin heating. When the cabin temperature rises to
where air conditioning is needed, the heat pump provides
cool, comfortable air. If the cabin temperature drops to
where heat is required, the heat pump provides heated air
to maintain cabin comfort. e controller will automatical-
ly turn on the LP gas furnace (or hydronic heating system,
if installed) when the outside air temperature reaches a
level where the heat pump can no longer eciently heat
the cabin.
e advantage of a heat pump system is that when con-
nected to shore power, the heating needs of the cabin are
supplemented by the heat pump, therefore, reducing the
heating demands of the furnace, which conserves LP usage
(or diesel fuel, with a hydronic heating system).
e roof-mounted heat pump installed on your motorhome
has a low-prole design, for reduced wind resistance while
underway. 120 volts AC shore power or on-board generated
power must be available in order to operate the heat pump.
NEVER operate air conditioners and heat pump without
lters. Doing so will clog the evaporator coil and may
substantially degrade the performance of the unit.
NOTICENOTICE
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