8
IX. OPERATION AND MAINTENANCE INSTRUCTIONS FOR
48000 SERIES
ROOF TOP HEAT PUMPS AND CEILING PLENUMS
i. GENERAL INFORMATION
NOTE: An optional auxiliary electric resistance
heating assembly can be installed to take the chill out
of the indoor air when the heat pump can no longer
operate. The heat pump will shut down at conditions
which would cause outdoor coil freeze- up, generally
near freezing temperatures.
This roof mount heat pump is designed to operate
from a 115 VAC, 60 HZ, 1 Phase power supply. A
qualified technician should verify that the heat pump
is receiving the proper power.
The ability of the heat pump to maintain the desired
inside temperature depends on the heat gain or heat
loss of the recreational vehicle. All sizing
considerations should be based on the cooling load
desired. The heat pump should be considered a
cooling unit which also provides heat at outdoor
temperatures above freezing. 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 heat pump is exceeded.
As a general rule, air entering the heat pump 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 heat pump is 80 degrees F., the air leaving the
discharge grilles in the heat pump will be 60 to 65
degrees F.
As long as this temperature difference is being
maintained between the return air and discharge air,
the heat pump 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 heat pump.
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 Heat Pumps
High Pressure Switch Lockout Circuit
Heat pumps 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.
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