Operating instructions

ManualsBrandsDometic ManualsHeat Pump630025

GRILLS

NOTE: The return air grill must have the same square surface

as the return air duct.

1) For each air conditioning system, there must be a return

grill to bring cabin air back into the unit. There must also be

at least four discharge grills per unit.

2) Return grills must be mounted in front of the evaporator. If

this is not possible, make sure there is nothing blocking the

air flow from the grill to the evaporator.

3) The unit must have a return filter between the grill and the

unit. This filter must be accessible for periodic cleaning.

OUTLET AIR

The air diffusion system, supplied by the installer, must be

sized to maintain a static pressure at the blower outlet be-

tween .4 and 1.2 inches water column.

All air handling ducts must be properly insulated to prevent

condensation forming on their surface during operation. A

vapor barrier must also be supplied on the outer surface of the

insulation to prevent moisture from traveling through the

insulation and condensing on the cold ductwork.

12C. OTHER

A. AMBIENT TEMPERATURE

Running the air conditioner at a temperature below 75 degrees

Fahrenheit may cause the evaporator to freeze up. The most

common time for this to occur is at night. Even after the

ambient temperature has gone up, the coils will remain frozen.

Therefore, to assist the defrosting of the evaporator coils, turn

the air conditioner to HI FAN mode; set the temperature

selector to a higher setting and let the air conditioner run until

the coils are defrosted.

B. HEAT GAIN

Heat gain can be caused by several factors: A hot, humid and

sunny day; a large number of people in the coach; frequent

opening of the door; excessive showering and cooking, etc.

Other factors to be taken into consideration as possible

heat gain causes are the size of the air conditioner relative to

the size of the coach; the "R" factor of insulation; and the size

and placement of widows. The manufacturer of the RV should

be consulted for recommendations.

C. LOOSE PARTS

Loose parts can cause the air conditioner to operate noisily.

Check for any loose bolts, any component rubbing against its

housing, or any plastic parts which might be cracked. Repair or

replace parts as necessary to correct any noise problems.

D.D.

TUBING VIBRATIONTUBING VIBRATION

TUBING VIBRATION

If any of the copper tubing is rubbing against itself or any other

part, verify that the proper tubing has been installed. Duo-

Therm air conditioners are designed to avoid this problem if the

correct tubing is used. Replace or position tubing as necessary.

E.E.

CONDENSER OR BLOWER FANCONDENSER OR BLOWER FAN

CONDENSER OR BLOWER FAN

The blower motor will have either a squirrel-cage or blade-type

fan attached to it. Turn the air conditioner circuit breaker to

OFF. Adjust the component to make sure it is not rubbing

against the bulkhead. If it is a blade-type fan, the blades should

be half through the opening for proper operation. Replace the

blade fan or squirrel-cage if necessary.

F.F.

INSTALLATIONINSTALLATION

INSTALLATION

The installation must be according to manufacturer's instruc-

tions for the specific model.

The air conditioner must not be installed in a valley on the roof;

water may pool around the drain holes and be drawn into the

air conditioner.

Make sure the air conditioner is tightened to the specifications.

Overtightening can cause the unit to leak. Use caution not to

damage the mounting gasket when placing the air conditioner

over the opening, as this can allow water to leak into the coach.

The air conditioner may be installed across a roof seam, but

make sure this area is properly sealed to prevent leakage.

G.G.

DRAIN HOLE PLUGGEDDRAIN HOLE PLUGGED

DRAIN HOLE PLUGGED

Some drain pan problems may be caused by a blockage or

restriction of the drain holes. This could be a piece of styrofoam

or dirt, etc., in or around a drain hole causing water to

accumulate in the drain pan and be sucked up into the unit.

Remove any blockage as necessary.

H.H.

EVAPORATOR BULKHEAD LEAKEVAPORATOR BULKHEAD LEAK

EVAPORATOR BULKHEAD LEAK

The rear section of the air conditioner which contains the

compressor, blower motor and condenser coil is designed to

dispose of any water which may enter. However, to ensure that