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SECTION 1
Operating Instructions
The operating instructions can change from one model
number to another. Be sure you are familiar with the prop-
er operating instructions for the specific control system or
model of air conditioner you are diagnosing. If not sure,
acquire the proper operating instructions for the unit you
are trouble shooting.
1.1 Mechanical Controls
This type of air conditioner has an air distribution box that
has a mechanical selector switch and thermostat installed
in it.
Selector Switch
The selector switch has eight positions including "OFF".
This controls the fan speed, heating mode (HEAT STRIP
OPTIONAL) and cooling modes.
Thermostat
The thermostat controls the temperature range from 65°
F. on the coldest side to 90° F. on the warmest side. In
the cooling mode, the compressors ON/OFF cycling are
controlled by the thermostat setting.
COOLING OPERATION:
A. Set the thermostat at the desired temperature level.
B. Select the fan speed that best satisfies your needs:
1. HIGH COOL: Selected when maximum cooling
and dehumidification required.
2. MED. COOL: Selected when normal or average
cooling required.
LOW COOL: Selected when room at desired com-
3
fort level and needs to be maintained. Normal-
ly this is speed used for night time operation.
Note: The blower runs continuously to circulate air and
maintain an even temperature. The compressor will come
on as cooling is required to maintain the selected tem-
perature level.
FROST FORMATION ON COOLING COIL:
Under certain conditions, frost may form on the evapora-
tor coil. If this should occur, inspect the filter and clean if
dirty. Make sure air louvers are not obstructed and com-
pletely open. Air conditioners have a greater tendency to
frost when the outside temperature is relatively low or fan
run on a low speed. This may be prevented by adjusting
the thermostat control knob to a warmer setting (counter
clockwise). Should frosting continue, operate on LOW,
MED, or HIGH FAN setting only until the cooling coil is
free of frost.
AFTER SHUTTING THE AIR CONDITIONER DOWN
WITH EITHER SELECTOR SWITCH OR THERMOSTAT,
WAIT AT LEAST TWO (2) MINUTES BEFORE RESTART-
ING. THIS ALLOWS THE REFRIGERANT PRESSURE
TO EQUALIzE AND COMPRESSOR TO START EAS-
ILy. FAILURE TO FOLLOW THIS INSTRUCTION MAy
CAUSE CIRCUIT BREAKERS OR FUSES TO OPEN.
Heating Operation:
(With Optional Heat Kit Installed)
Note: This electric heater will not replace a furnace for
heating the RV in cold weather. The intent is to remove
the chill on cool days or mornings. The temperature rise
across the heat strip should be 5° to 7° degrees. If the
temperature in the coach is 50° degrees the temp coming
out of the unit will be approximately 55° to 57°. On the
hand this will feel cool and the user may not think the unit
is working.
A. Turn
the
B. The heater will come on and begin heating.
C. When desired temperature level in RV is reached,
move the selector switch to off position or fan position.
Note: Thermostat does not control heater ON/OFF cy-
cle.
Fan Operation
This will circulate the air in your RV without cooling or
heating. There are three positions: HIGH FAN, MED FAN
or LOW FAN to select from, depending upon personal
choice. "OFF" POSITION: This is to turn unit off.
1.2 Analog Control System
This type of air conditioner controls can be ducted or have
an air distribution box with wall T-Stat.
.
Cooling Operation:
A. Place the Temperature Set Lever to the desired tem-
perature level (located at right side of thermostat).
B. Select fan speed that best satisfies your needs (switch
located at lower center of thermostat).
• High Speed: Selected when the maximum cooling and
dehumidification are required.
• Low Speed: Selected when RV reaches desired com-
fort level and needs to be maintained. Normally this
speed is used for nighttime operation
C. Select Auto/On Switch operation as follows: (switch
located at upper center of thermostat)
9
selector
switch
to
"OPT.
HEAT".
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