11
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 Heat Pump 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 Heat Pump 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 Heat Pump compressor is unable to start against
high pressure. Therefore, once the Heat Pump 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 Heat Pump
unit drops below this setting a few degrees and
automatically turns o when the temperature of
the air entering the Heat Pump 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 Heat Pump 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 Heat Pump
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 Heat Pump for extended periods
of time without the lter installed.
An even more serious condition occurs when the Heat
Pump 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 Heat
Pump.
We recommend that the lters be cleaned and changed at
least every two weeks when the Heat Pump is in operation.
Cleaning and/or changing the lters:
1. Remove the two grilles from the ceiling assembly by
pulling the tabs on the grilles.
2. Remove and clean or replace the two lters.
3. Re-install the lters and grilles in the ceiling
assembly as shown in Figure 2.
4. If the vehicle is equipped with a ush mount ceiling
assembly, remove the four return air grille screws.
Remove lter from the grille and either clean or
exchange with new lters.
NOTE: If replacement lters are necessary, the lters can be
purchased from most Airxcel, Inc. Authorized Service Centers. It
is recommended that spare lters be carried with the RV at all
times to replace worn, torn or deteriorated lters.
II. Service Person
A. Electrical – All electrical work and/or inspection
should be performed only by qualied service
personnel. Contact your nearest Airxcel, Inc.
Service Center if electrical problems should arise.
B. Check Points – Failure to start or to cool the air are
sometimes problems with Heat Pump units. The
Coleman-Mach RV Heat Pump is designed to operate
on 115 volt electrical power. If the compressor on the
Heat Pump fails to start, check with your Airxcel, Inc.
Service Center to determine that the proper wire size
is connected to the unit, the proper circuit breakers are
installed as protection devices on the electrical circuit
and the proper sized extension cord is being used for
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