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iii. OPERATION
I. For Cooling (Refer to Figure 1, page 10).
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. When the temperature of the air
entering the air conditioner drops below the
selected setting, the thermostat will turn the
compressor off. The air conditioner, while in the
cooling mode, will continue to cycle the
compressor on and off 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 flow.
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°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°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 flow. When increased
or full air flow 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 off, it will take two to three minutes
for this high pressure to equalize. The air conditioner
compressor is unable to start against high pressure.
Therefore, once the air conditioner is turned off, it is
important to leave it off 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 10)
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 effective “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 off 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 off 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 flow.
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 efficient 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 10).
A. Turn the selector switch to “LOW FAN” or, for
maximum air flow, to “HIGH FAN”.
B. Position the louvers to the desired direction the
discharge air is to flow.
NOTE: When the selector switch is in the “LOW FAN”
or “HIGH FAN” position, the blower motor will
operate continuously.
iv. ROUTINE MAINTENANCE
I. Owner – One of the biggest advantages to your
new Coleman-Mach air conditioner is that the
needed 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 filters.
Filters are made from long life non-allergenic natural
fibers which can be cleaned and reused, and which
completely filter the circulated air when the air
conditioner is in operation. If the filters are not
cleaned at regular intervals, they may become
partially clogged with lint, dirt, grease, etc. A clogged
filter will produce a loss of air volume and may
eventually cause an icing-up of the cooling
(evaporator) coil.
The ceiling assembly and the outside shroud can be
cleaned with a damp cloth. When required, a mild
detergent can be used.
IMPORTANT
Do not operate your air conditioner for extended
periods of time without the filter installed.
An even more serious condition occurs when the air
conditioner is operated without a filter. When this
happens, the lint, grease, etc. that are normally
stopped by the filter 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 filters be cleaned and changed at least every
two weeks when the air conditioner is in operation.
Cleaning and/or changing the filters:
1. Remove the two grilles from the ceiling assembly by
pulling the tabs on the grilles.
2. Remove and clean or replace the two filters.
3. Re-install the filters and grilles in the ceiling
assembly as shown in Figure 2, page 10.
4. If the vehicle is equipped with a flush mount ceiling
assembly, remove the four return air grille screws.
Remove the filter from the grille and either clean or
exchange with new filters.
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