Operating Instructions - Dometic 640312 Series Installation And Operating Instructions Manual

FIG. 13
Auxiliary Screw Locations
Auxiliary Screw
Locations
5. Filter installation. Slide filters into slots in air dis-
tribution box. The outward curved side of the filter
handle faces the ceiling. See FIG. 13.
6. Knob installation. Install the two knobs provided
on the ends of the thermostat and selector switch
shafts. Align slot in knob with alignment post on
shaft and push into position.
7. The power supply to the unit may now be turned
"ON".
8. Your unit is now installed and ready for operation.
Read the following operating instructions before
attempting to run the unit.
Install 2 Primary
Mount Screw First

OPERATING INSTRUCTIONS

A. 3310741 Air Distribution Box With Me-
chanical Controls
1. Selector Switch & Thermostat
a. Model 3310741 ADB has a five position Se-
lector Switch including "OFF". This controls
fan speed and cooling modes. See FIG. 14.
b. The thermostat controls the compressor ON/
OFF operation for a temperature range from
approx. 65° F. to 90° F. at the ADB inlet, de-
pending on the knob position. See Fig. 14.
Important:
When the unit is turned on and the ther-
mostat calls for cooling, the compressor will start. After
shutting the unit down manually by either the selec-
tor switch or the thermostat, always wait 2-3 minutes
before turning on the unit. This allows the refrigerant
pressures in the unit system to equalize so the com-
pressor may restart.
FIG. 14
Gray Graphic
2. Cooling Operation (Blue Graphic)
a. Set the thermostat at the desired tempera-
ture level. See FIG. 14.
b. Select the cooling mode that best satisfies
your needs:
• HIGH COOL: Selected when maximum
cooling and dehumidification required.
• LOW COOL: Select to maintain room at
desired comfort level. Normally this speed
used for night time operation.
Note: The compressor will come on as cooling is required
to maintain the selected temperature level. The blower
runs continuously.
3. Fan Operation (Gray Graphic)
a. This will circulate the air in your RV without
cooling. There are two positions: HIGH FAN
or LOW FAN to select from, depending upon
personal choice.
4. "OFF" Position
a. This is to turn unit off.
9
Colder
Blue Graphic