2
I. GENERAL INFORMATION
OEM – Please make sure all documentation
accompanies the Heat Pump.
INSTALLER AND/OR DEALER – Please make sure all
documentation is presented to the product consumer.
The product consumer should also be aorded the
opportunity to purchase the OPTIONAL THREE (3)
YEAR PARTS REPLACEMENT CONTRACT available
from Airxcel, Inc.
For more information about the contract, please review the
sample contract located at www.Airxcel.com/Warranty.
Use the application on the back of the OPERATION
AND MAINTENANCE INSTRUCTIONS to apply for the
extended parts contract.
INQUIRIES ABOUT THE UNIT – Inquiries to your
Airxcel, Inc. representative or to Airxcel, Inc. pertaining
to product installation should contain both the model
and serial numbers of the roof top Heat Pump. All roof
top Heat Pump units have model and serial number
identication in two locations; (1) Rating Plate sticker
- may be viewed by looking through the shroud louvers
on the compressor side of the roof top Heat Pump unit.
The rating plate sticker can be seen without removing
the outer plastic shroud, (2) Model/Serial number sticker
(silver color) - located on the bottom of the basepan of
the roof top Heat Pump. If the Heat Pump is installed,
the sticker may be viewed by lowering the ceiling
assembly shroud.
II. HEAT PUMP SIZING
Heat Pumps should be rated primarily by their ability to
cool. The ability of a Heat Pump to provide a comfortable
environment for the consumer is dependent upon the
following conditions.
The ability of a Heat Pump in the cooling mode to cool
a vehicle or maintain a consumer desired temperature is
dependent on the heat gain of the vehicle.
The physical size of the vehicle, the amount of window
area, the quality and amount of insulation, the position
exposure to sunlight, the number of people using the
vehicle and the outside temperature may increase the
heat gain to such an extent that the capacity of the Heat
Pump is exceeded.
As a general rule, air supplied (discharge air) from the Heat
Pump will be 15 to 20 degrees cooler than the air entering
(return air) the ceiling assemblies bottom air grilles.
For example, if the air entering the Heat Pump is 80°
(degrees F) - (return air), the supply air (discharge air)
into the vehicle will be 60° to 65° (degrees F). As long
as this temperature dierence (15 to 20 degrees) is
being maintained by the Heat Pump, the Heat Pump is
operating properly.
Again, give careful consideration to the vehicle heat gain
variables. During extreme outdoor temperatures, the
heat gain of the vehicle may be reduced by:
• Parking the vehicle in a shaded area
• Keeping windows and doors closed
• Avoiding the use of heat producing appliances
• Using window shades (blinds and/or curtains)
For a more permanent solution to high heat gain
situations, additional vehicle insulation, window awnings
and/or window glass tinting should be considered. A Heat
Pump should not be considered as a total replacement
for a furnace. At ambient temperatures below freezing,
the Heat Pump will not operate.
III. SELECTING AN INSTALLATION LOCATION
Your Airxcel, Inc. Heat Pump has been designed for use
primarily in recreational vehicles.
Is the roof of the vehicle capable of supporting both the
roof top unit and ceiling assembly without additional
support structures? Inspect the interior ceiling mounting
area to avoid interference with existing structural
members such as: bunks, curtains, tracks or room
dividers. The depth of the ceiling assembly shroud is
3”. Be sure to check clearance for doors which must be
swung open (refrigerator, closets, cabinets).
Most of the time, roof mount Heat Pumps are installed
at existing roof vent locations. If there are no roof
vents (existing mounting hole), the following placement
locations are recommended.
Motor Homes – a single unit or the forward of two
units should be mounted within 9 feet of the driver’s
compartment.
Travel Trailers or Mini-Homes – a location should be
selected that is near the door slightly forward of the
vehicle center length.
Vans – location should be in the center of the roof (side
to side – front to back).
Truck with Camper – location should be between 4 or
5 feet from the rear of the camper to achieve maximum
cooling eect.
IV. INSTALLING THE ROOF TOP UNIT
DANGER! SHOCK HAZARD DISCONNECT ALL
POWER TO THE VEHICLE BEFORE PERFORMING
ANY CUTTING TO THE VEHICLE. CONTACT WITH
HIGH VOLTAGE CAN RESULT IN EQUIPMENT
DAMAGE, PERSONAL INJURY OR DEATH.
IMPORTANT
TO PREVENT DAMAGE TO THE WIRING AND
BATTERY, DISCONNECT THE BATTERY CABLE
FROM THE POSITIVE BATTERY TERMINAL BEFORE
PERMORMING ANY CUTTING TO THE VEHICLE.
This Heat Pump is to be installed in accordance with
NFPA Standard 501C.
If the Heat Pump is being installed on a low friction roof
surface such as aluminum, steel or gelcoat berglass, it
is advisable to order a spring pad kit, part number
8333-3871 to add “spring pads” to maintain bolt tension
and retard lateral motion of the Heat Pump which could
shear the mounting bolts.
If the Heat Pump is being installed subject to heavy
lateral loads, it is advisable to order a “Roughneck”
gasket/bolt package, part number 48207-3301 to
maintain bolt tension, prevent lateral movement of the
Heat Pump and guard against bolt shear.
A. STANDARD INSTALLATION
Once the location for your Heat Pump has been
determined (See Section III), a reinforced and framed
roof hole opening must be provided (may use existing
roof vent opening). Before cutting into the vehicle
roof, verify that the cutting action will clear all structural
members and crossbeams. Additionally, the location of
any inner roof plumbing and electrical supplies must be
considered.
1. If a roof vent is already present in the desired
mounting location for the Heat Pump, the following
steps must be taken:
a. Remove all screws which secure the roof vent to
the vehicle. Remove the vent and any additional
trim materials. Carefully remove all caulking
from around the roof vent opening to obtain clean
exterior roof surface.
b. It may be necessary to seal some of the old roof
vent mounting screw holes which may fall outside
of the Heat Pump basepan gasket.
c. Examine the roof opening. If the opening is
smaller than 14” x 14”, the opening must be
