Heat Pump Sizing; Selecting An Installation Location; Installing The Roof Top Unit - Airxcel 47000 Série Instructions D'installation

Heat pumps should be rated primarily by their ability to cool.
The thermal measurement used for detecting a gain or loss of
heat is the British Thermal Unit (BTU). One (1) BTU is the
amount of heat required to raise the temperature of one pound
of water by one degree Fahrenheit. A heat pump rated at
13,500 BTUH can remove 13,500 BTU's of heat in one hour.
The ability of a heat pump to cool down a vehicle or maintain
a consumer desired temperature is dependent upon the heat
gain of the vehicle. The physical size, 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 assembly's 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
Your Mach 8 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.
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.
II. HEAT PUMP SIZING
III. SELECTING AN INSTALLATION LOCATION
IV. INSTALLING THE ROOF TOP UNIT
be 60 to 65 degrees F. As long as this temperature difference
(15 to 20 degrees) is being maintained at 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.
Motor Homes – a single unit or the forward of two units
should be mounted within 9 feet of the drivers 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
effect.
TO PREVENT DAMAGE TO THE WIRING AND
BATTERY, DISCONNECT THE BATTERY CABLE
FROM THE POSITIVE BATTERY TERMINAL
BEFORE PERFORMING ANY CUTTING TO THE
VEHICLE.
3
IMPORTANT