Thermistors
The main control board uses input from 3 thermistors. These thermistors are located on the indoor coil,
outdoor coil, and outdoor fan shroud. The main control board monitors the thermistors to determine the
temperature in these areas and uses this information to make operating decisions.
For the optional room air sensor (kit), see the Room Air Sensor section in the Features and Operation
chapter.
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Thermostatic Drain Valve
During the cooling season, the thermostatic drain
valve remains closed to allow water to accumulate
in the base pan. The water is then picked up by
the outdoor fan blade and blown into the
condenser, providing more efficient cooling.
During heat pump season the thermostatic drain
opens to allow water to drain from the base pan
prior to freezing. This prevents the outdoor fan
blade from scraping against ice that could freeze
in the bottom of the base pan.
The thermostatic drain valve is operated by a self-
contained thermostat. The thermostat begins to
open the drain valve at approximately 58 °F and
will be fully open at approximately 45 °F.
To remove the thermostatic drain valve:
1. Remove the unit from the cabinet (see Slide-
Out Chassis chapter).
2. Remove the left divider assembly.
3. Remove 2 screws and the thermostatic drain
valve.
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1
MAIN
BOARD
INDOOR THERMISTOR
OUTDOOR THERMISTOR
OUTSIDE THERMISTOR
GEA01212
INDOOR COIL THERMISTOR
OUTDOOR COIL THERMISTOR
OUTDOOR AIR THERMISTOR
CN1
Summary of Contents for AZ75E09DAC
Page 7: ... 5 Direct Connection 208 VAC 230 VAC 265 VAC ...
Page 37: ... 35 Notes ...
Page 45: ... 43 Parts List ...
Page 46: ... 44 ...
Page 47: ... 45 ...
Page 48: ... 46 ...
Page 55: ... 53 Notes ...
