Maintenance; Air Filter; Adb Housing; Fan Motor - Dometic 489516P series Installation & Operating Instruction

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.
 N EVER 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

A.

Frost Formation On Cooling Coil

1. 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 out-
put at very low air speed and the icing can be
seen through the air inlet hole with the filter re-
moved. If this should occur, 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 ther-
mostat control knob to a warmer setting (coun-
ter clockwise). Should frosting continue, 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 assistance.
B.

Heat Gain

The ability of this air conditioner to maintain the desired
inside temperature depends on the heat gain of the boat.
Some preventative measures taken by the occupants of the
boat 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. Mooring the boat 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
5. Add heat-rejection film on windows
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.
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.
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.
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