HEATING AND COOLING
199
14
THOR MOTOR COACH | MADE TO FIT
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.
NOTICE
Manual Controls for Roof-Mount Air
Conditioners
ree basic controls on the air conditioner’s ceiling assembly
operate the air conditioner’s functions. e three controls are:
Selector switch:
e selector switch determines which mode of operation the
air conditioner will be in. By rotating the selector switch, the
operator can obtain any system function desired. System
functions vary depending upon options of the air-condi-
tioning unit.
Thermostat (temperature control):
In the cooling mode, the thermostat regulates the ON and
OFF temperature setting at which the compressor will
operate. For ‘Heat/Cool’ models (heat pumps and units with
built-in heating coils), the thermostat also controls the ON
and OFF temperature setting of the heater assembly.
Louvers:
e louvers are located at both ends of the ceiling assembly
shroud and are used in directing the discharge air from the
air-conditioning unit.
NOTE: Some air conditioners are supplied with an
optional Elect-A-Heat heating device, which is intended
to take the chill out of the indoor air when the air is a
few degrees too cool for comfort. This heating element
is an effective ‘chill chaser,’ but is not a substitute for a
furnace.
Basic Air Conditioner Operation
e following basic instructions pertain to all air conditioner
installations, regardless of the control device (multiplex
panel, wall-mounted thermostat, or on-unit control panel).
1. Turn ON the master battery 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 selected temperature setting.
e thermostat will continue to cycle the compressor on
and o in the above-mentioned fashion until the selector
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 (24 C), it is import-
ant 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 (24 C), 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, operate 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.
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 pressures
have equalized), will in some instances, trip the circuit
breaker.
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