3
Operating Instructions
Thermostat
This unit will not operate properly without a good quality,
correctly installed thermostat. It is very important that the
thermostat be located where it can get the best “sens-
ing” average room temperature. Be sure the thermostat
is not exposed to hot or cold drafts or to hot or cold spots
on the wall, such as those received from outside walls,
walls with pipes inside, or from openings into the attic.
No matter the type or style, thermostat operation is
basically the same. The most widely used types will
control both heating and cooling functions and will have a
Fan Switch with Auto and ON settings. On Auto, the
Circulating Air Blower will cycle on/off, but if switched to
ON it will run constantly.
There are thermostats that automatically switch from
Heating to Cooling, or with night setbacks. The night
setback, or multiple setback type, will lower the tempera-
ture at night or during the day when the building is
unoccupied.
Compressor Protection Devices
The PCC**C compressor includes components which are
designed to protect the compressor against abnormal
operating conditions. These components do not affect
the operation of the indoor blower.
Indoor A.ir Circulating Blower
Keep the blower access door and access panel in place
except for inspection and maintenance.
Fan Switch
Cool/Heat
Switch
Cool/Heat
Temperature
Control Dials
Room Temperature
Thermostat
System
Switch
Fan
Switch
Action
OFF AUTO
None
COOL AUTO
System only cools, fan
cycles off and on.
COOL ON
System only cools, fan
runs all the time.
HEAT AUTO
System only heats, fan
cycles off and on.
HEAT ON
System only heats, fan
runs all the time.
OFF ON
No heating or cooling,
fan runs all the time.
Figure 1
Typical Thermostat
General Information
CAUTION
This unit must not be used as a “construction heater” during the finishing phases of construction on a new
structure. This type of use may result in premature failure of the unit due to extremely low return air temperatures
and exposure to very dirty atmospheres.
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the COOL or HEAT position (or AUTO if available, and if automatic
changeover from cooling to heating is desired).
3. Set the room thermostat to the desired temperature.
WARNING
To prevent death or personal injury, always disconnect the electrical power before inspecting or servicing the unit.
Since all of the compressor protection devices reset automatically, the contactor and outdoor fan may be energized
when reset.
NOTE: These units are not designed to provide mechanical cooling at outdoor temperatures below 50°F. If low
ambient cooling is needed, consult a qualified servicer.
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