10
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 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 heat pump
rises a few degrees above the setting you have
selected. When the temperature of the air
entering the heat pump drops below the selected
setting, the thermostat will turn the compressor
off. The Heat pump, 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 a heat pump 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 heat
pump 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 Operation (Refer to Figure 1, page 9).
NOTE: The heat pump will operate on reverse cycle
refrigerant heating at outdoor temperatures above
freezing. When the outdoor temperature is below
freezing, the heat pump compressor will shut down to
prevent outdoor coil freeze-up. At this time, if the
optional auxiliary electric resistance heater has been
installed, it will be energized to take the chill out of the
indoor air. The electric resistance heater is not a
substitute for a furnace at these low outdoor
temperatures.
A. Turn the selector switch to the “HIGH HEAT”
position. At “HIGH HEAT”, the fan operates on high
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 compressor/heater on
when the temperature of the air entering the heat
pump unit drops below this setting a few degrees
and automatically turns off when the temperature
of the air entering the heat pump rises a few
degrees above this setting. The compressor/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 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 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 heat pump
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 heat pump for extended
periods of time without the filter installed.
An even more serious condition occurs when the
heat pump 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 heat pump.
We recommend that the filters be cleaned and
changed at least every two weeks when the heat
pump is in operation.
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