116
Heating & Cooling
Capability vs. Environment
At best, a properly functioning roof air conditioner will cool
the intake air it receives by 20 degrees F. The capability of the
air conditioner to maintain the desired inside temperature is
directly affected by the heat gain of the RV. During extreme
high outdoor temperatures, the heat gain of the vehicle may
be reduced by the following:
1. Parking the RV in a shaded area
2. Keep the blinds down or drapes shut.
3. Operating the air conditioner on High Fan/Cooling
mode will provide the maximum efficiency in high hu-
midity or high temperatures.
4. Use awnings to block direct sunlight exposure on the
RV.
5. Avoiding use of heat producing appliances.
6. Giving the air conditioner a “head start” by turning it on
early in the morning.
Air conditioner gasket
A special foam gasket is placed between the roof material
and the sub-frame of the air conditioner to guard against wa-
ter leakage. The air conditioner is subjected to wind pressures
along with motor vibration during normal operation. Inspect
the mounting bolts for tightness to ensure there is no leakage
or looseness at least annually. Re-tighten bolts when they are
loose. DO NOT over tighten these bolts as it may damage
this gasket. The air conditioner gasket is a wearable part that
eventually will need to be replaced as normal maintenance.
To gain access to the bolts, remove the filtered panel cover
on central air systems or the entire air box on non-central air
conditioners from inside the RV.
FURNACE
The RV furnace installed in the RV is controlled by a thermo-
stat. The furnace requires both 12-volt power and propane
gas for full operation. Make sure you have sufficient pow-
er available before operating your furnace. If you have any
questions contact your dealer or Grand Design RV Customer
Service. A qualified RV technician should perform all furnace
maintenance at least once a year (more often depending on
furnace usage). Never attempt to repair the furnace yourself.
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