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A. Frost Formation
1. On Cooling Coil
a. Frost on a small portion of the coil is not
unusual. Under certain conditions, ice may
form on the evaporator coil. This is indicated
by very cold output at very low air speed and
the icing can be seen through the air inlet
hole with the filter removed. If this should oc
-
cur, inspect the filter and clean if dirty. Make
sure air vents are open and not obstructed.
Units have a greater tendency to frost when
the outside temperature is relatively low.
This may be prevented by adjusting the
thermostat control knob to a warmer setting
(counter clockwise). Should frosting contin-
ue, operate on any FAN ONLY setting until
the cooling coil is free of frost; then resume
normal operation. If frost condition persist,
contact your local service center for assis-
tance.
2. On Outdoor Coil While Heating
a. Operation at low outdoor temperatures
causes low coil temperatures. This can result
in ice forming on the outdoor coil in certain
conditions. This is indicated by reduced heat
output and could fully stop fan rotation in ex-
treme conditions. To avoid this, the system
controls turn off the compressor if outdoor
temperature drops below 42° F and returns
heating when the temperature raises 5° F.
MAINTENANCE
A. Air Filter
1. Periodically (a minimum of every 2 weeks of op-
eration) remove the return air filter located be
-
hind the return air vent grille and wash it with
soap and warm water, let dry and then reinstall.
NEVER
run unit without return air filter
in place. This will plug the unit evapora-
tor coil with dirt and may substantially
degrade the performance of the unit over
time.
GENERAL INFORMATION
B. ADB Housing
1. Clean ADB housing and control panel with a soft
cloth dampened with a mild detergent. Never
use furniture polish or scouring powders.
C. Fan Motor
1. The blower motor is factory lubricated and re-
quires no service.
B. Heat Gain
The ability of this air conditioner to maintain the desired
inside temperature depends on the heat gain of the RV.
Some preventative measures taken by the occupants of the
RV can reduce the heat gain and improve the performance
of the air conditioner. During extremely high outdoor tem-
peratures, the heat gain of the vehicle may be reduced by:
1. Parking the RV in a shaded area
2. Using window shades (blinds and/or curtains)
3. Keeping windows and doors shut or minimizing
usage
4. Avoiding the use of heat producing appliances
Operation on High Fan/Cooling mode will give optimum
or maximum efficiency in high humidity or high outside
temperatures.
Starting the air conditioner early in the morning and giving
it a “head start” on the expected high outdoor ambient will
greatly improve its ability to maintain the desired indoor
temperature.
For a more permanent solution to high heat gain, acces-
sories like Dometic outdoor patio and window awnings will
reduce heat gain by removing the direct sun. They also add
a nice area to enjoy company during the cool of the evening.
C. Condensation
The manufacturer of this unit will not be responsible for
damage caused by condensation forming on ceilings,
windows, or other surfaces. Air contains water vapor which
condenses when temperature of a surface is below Dew
point. During normal operation this unit is designed to
remove a certain amount of moisture from the air, depend-
ing on the size of the space being conditioned. Keeping
doors and windows closed when this air conditioner is in
operation will greatly reduce the chance of condensation
forming on interior surfaces.
