14
Section B - Operation
B. Operation
The recreational vehicle manufacturer has equipped the
vehicle with Duo-Therm’s Air Conditioner. The ability of
the unit to maintain the desired inside temperature depends
on the heat gain of the RV. Some preventative measures
can be taken by the occupants of the RV to reduce the
heat gain and improve the performance of the unit. During
extremely high outdoor temperatures, 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. Avoid use of heat producing appliances.
5. Starting the unit early in the morning and giving it a
“head start” on the expected high outdoor tempera-
tures will greatly improve its ability to maintain the de-
sired indoor temperature.
The operating instructions can change from one model to
another.
Be sure you are familiar with the proper operating instruc-
tions for the specific model of air conditioner you are diag-
nosing. An installation and operating manual is packaged
with each air conditioner system.
B1. Air Conditioners
B1a. Mechanical Controls
This type of air conditioner has an air distribution box that
has a mechanical selector switch and thermostat installed
in it.
Controls
The Selector Switch has eight positions including “OFF”.
This controls fan speed, heating mode and cooling modes.
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 compressor ON/OFF is controlled by
the thermostat setting. See FIG. B1.
Mechanical Cooling Operation
Set the thermostat at the desired temperature level. Se-
lect the fan speed that best satisfies your needs. See FIG.
B1.
a.
HIGH COOL
- Selected when maximum cooling
and dehumidification is required.
b.
MED. COOL
- Selected when normal or average
cooling is required.
c.
LOW COOL
- Selected when room is at desired
comfort level and needs to be maintained. Nor-
mally this speed is used for nighttime 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 tempera-
ture level.
After shutting the air conditioner down with
either selector switch or thermostat, wait at
least two (2) minutes before restarting. This
allows the refrigerant pressure to equalize
and compressor to restart easily.
Fan Operation
This will circulate the air in your RV without cooling or heat-
ing. There are three positions: HIGH FAN, MED. FAN or
LOW FAN to select from, depending upon personal choice.
Heating Operation
(With Optional Heat Kit Installed)
Note:
This electric heater will not replace a furnace for
heating your RV in cold weather. The intent is to remove
the chill on cool days or mornings.
1. Turn the selector switch to “OPT. HEAT”.
2. The heater will come on and begin heating.
3. 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 cycle.
“OFF” Position turns unit off. See FIG. B1.
B1b. Bimetal Relay Controls
This type of air conditioner has a wall mounted bimetal ther-
mostat and a relay board that replaces the mechanical
switch and thermostat on the mechanical units and replaces
the main board and control board on the electronic units.
Note:
Remember to check the installation and operating
instructions for the specific model of air conditioner you
are diagnosing.
FIG. B1
Manual
Compliments
of
Northwest
RV
Supply
Printed
From
http://www.nwrvsupply.com
