9
OPERATION AND MAINTENANCE
INSTRUCTIONS FOR 45000 SERIES
ROOF TOP AIR CONDITIONERS AND CEILING PLENUM
i. GENERAL INFORMATION
This roof mount air conditioner is designed to operate
from a 115 VAC, 60 HZ, 1 Phase power supply.
Anytime an air conditioner is not operating properly, the
power supply should be examined by a qualified
technician to verify that the air conditioner is receiving
the proper power supply.
The ability of the air conditioner to maintain the desired
inside temperature depends on the heat gain or heat
loss of the recreational vehicle.
The size of the vehicle, amount of window area, amount
of insulation, direct exposure to the sun, outside
temperature and the number of people in the
recreational vehicle may increase the heat gain to such
an extent that the capacity of the air conditioner is
exceeded.
As a general rule, air entering the air conditioner will be
cooled about 15 to 20 degrees, depending on the
outside temperature and humidity conditions.
For example, if the air entering the return air grilles in
the Air conditioner is 80 degrees F., the air leaving the
discharge grilles in the air conditioner will be 60 to 65
degrees F.
As long as this temperature difference is being
maintained between the return air and discharge air,
the air conditioner is operating at its capacity. If the
desired inside temperature (normally 80 degrees F)
cannot be maintained, then the heat gain of the RV is
too great for the capacity of the air conditioner.
Parking the vehicle in a shaded area, keeping windows
and doors shut and avoiding the use of heat producing
appliances in the vehicle will help to reduce the heat
gain. When possible, the addition of insulation and
tinted glass (especially in uninsulated vans) should be
considered.
R410A Roof Top Air Conditioners
High Pressure Switch Lockout Circuit
Air conditioners using R410A refrigerant may utilize a
factory installed High Pressure Switch Safety Circuit. In
the event of an abnormal condition (failure of fan motor,
dirty condenser coil, dirty filters), the high-pressure
switch will prevent the compressor from continuing to
run. Once the high-pressure switch has tripped, this
safety circuit will “Lock Out” the compressor preventing
it from trying to restart or run until the 115 VAC supply
power has been turned off and then back on to reset
the High Pressure Switch Safety Circuit. If repeated
trips of the high-pressure switch lock out occur, then
you must have the unit serviced by a qualified
technician.
NOTE: 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.
IMPORTANT
The Elect-A-Heat heating assembly can not be
added to a rooftop unit that does not use a standard
ceiling assembly mounting.
ii. CONTROL PANEL
If your RV air conditioner is operated from the control
panel located in the ceiling assembly, there are three
controls on the ceiling assembly that help you control
the air conditioner:
A. The Selector Switch – The selector switch
determines which mode of operation the air
conditioner 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. See Figure 1.
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.
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