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iii. OPERATION
I. For Cooling (Refer to Figure 1, page 8).
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 conditioning
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 8.
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 8).
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.
v. ROUTINE 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 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.
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.
