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ii. CONTROL PANEL
If your RV Heat Pump 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 Heat Pump. They are as follows:
A. The Selector Switch – The selector switch
determines which mode of operation the Heat
Pump 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.
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 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 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 heat pump 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
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 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 Heat Pump 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 8).
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.
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 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.
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