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ii. CONTROL PANEL
If your RV air conditioner is operated from the control
panel located in the ceiling assembly, then there are
three controls on the ceiling assembly that help you
control the air conditioner. They are as follows:
A. The Selector Switch – The 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
both the roof top unit and ceiling assembly. Figure 1
shows selector switch location and lists all available
functions by model.
The “Operation” section explains the operational
characteristics of each mode of operation.
B. The 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, the thermostat also controls
the “ON” and “OFF” temperature settings of the
heater assembly (See Figure 1).
C. Louvers – The louvers are located at both ends
of the ceiling assembly shroud and are used in
directing the discharge air from the unit.
iii. OPERATION
I. For Cooling (Refer to Figure 1, page 9).
A. Turn the selector switch to the “LOW COOL” or
“HIGH COOL” position.
B. Rotate the thermostat (temperature control) to the
position that is the most comfortable to you. The
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. Then the temperature of the air entering
continues to cycle the compressor on and o in the
above mentioned fashion until the selector switch is
turned to another mode of operation.
C. Position the louvers to the desired direction the
discharge air is to ow.
Note: The fan operation is constant, only the compressor
cycles on the thermostat.
II. Operation During Cooler Nights (Cooling Operation).
It is important, when the outdoor temperature drops in
the evening or during the night to below 75 degrees F.,
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, operate the unit in the “HIGH FAN”
position with the system at maximum air ow. When increased
or full air ow is observed, the cooling coil should be clear of ice.
III. 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.
The air conditioning compressor is unable to start against
high pressure. Therefore, once the air conditioner is
turned o, it is important to leave it o for two to three
minutes before restarting.
Short cycling the compressor (or starting it before
pressures have equalized), will in some instances, kick
the circuit breaker or overload.
IV. For Heating (“Elect-A-Heat” Ceiling Assembly
Model Only) Refer to Figure 1, page 9).
The optional Elect-A-Heat heating assembly is intended
to take the chill out of the indoor air when the air is a few
degrees too cool for comfort. The heating assembly is an
eective “chill chaser”. It is not a substitute for a furnace.
Do not expect the heating coil on your heater to glow.
Because the fan draws in cold air and forces it over the
coil, the coil will not turn red. A hint of red may occur
where the moving air does not directly touch the coil.
A. Turn the selector switch to the “LOW HEAT” position.
At “LOW HEAT”, the fan operates on low speed with
heat output at maximum.
B. Rotate the thermostat (temperature control) switch
to the position that is the most comfortable to you.
The thermostat will turn the heater on when the
temperature of the air entering the air conditioning
unit drops below this setting a few degrees and
automatically turns o when the temperature of the
air entering the air conditioner rises a few degrees
above this setting. The heater will continue to cycle
on and o in this fashion until the selector switch is
turned to another mode of operation.
C. Position the louvers to the desired direction the
discharge air is to ow.
Discharge air temperature can be controlled to some
extent by opening or closing the louvers.
When the louvers are closed, the warmest localized
discharge air is achieved. Fully opened louvers will
throw the warm discharge air to the back and front of the
vehicle for more ecient circulation and faster warm-up.
Although the air temperature is lower with the louvers
fully opened, the heating capacity is still the same.
V. For Air Circulation Only (Refer to Figure 1, page 9).
A. Turn the selector switch to “LOW FAN” or for
maximum air ow, to “HIGH FAN”.
B. Position the louvers to the desired direction the
discharge air is to ow.
NOTE: When the selector switch is in the “LOW FAN” or “HIGH
FAN” position, the blower motor will operate continuously.
iv. MAINTENANCE
I. Owner - One of the biggest advantages to your new
Coleman-Mach air conditioner is that the maintenance
needed to keep the unit in good working order is minimal.
In fact about the only thing you, the owner, must take care
of is the cleaning and replacement of the lters.
Filters are made from long life non-allergenic natural
bers which can be cleaned and reused, and which
completely lter the circulated air when the air conditioner
is in operation. If the lters are not cleaned at regular
intervals, they may become partially clogged with lint,
dirt, grease, etc. A clogged lter will produce a loss of
air volume and may eventually cause an icing-up of the
cooling (evaporator) coil.
IMPORTANT
Do not operate your air conditioner for extended
periods of time without the lter installed.
An even more serious condition occurs when the air
conditioner is operated without a lter. When this
happens the lint, grease, etc. that are normally stopped
by the lter are now accumulating in the cooling
coil. This not only leads to a loss of air volume and
a possible icing-up of the cooling coil, but could also
result in serious damage to the operating components
of the air conditioner.
We recommend that the lters be cleaned and changed
at least every two weeks when the air conditioner is in
operation.
