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S S E E N N S S O O R R S S
Ambient Temperature Sensor
(ODS)
These tables show the corresponding voltage,
resistance and temperature readings for the Ambient,
Temperature Sensor when measured across pins 5 &
14.
The power source for the Ambient, Coil and Suction
Temperature sensors is 3.2VDC
14
Figure 4. Ambient Temperature Sensor
9
8
7
6
18
17
16
15
14
The Ambient Temperature Sensor control has an NTC
thermistor input for sensing the outdoor air
temperature and has a nominal resistance of 10k
ohms at 75°F. The Ambient Temperature is measured
across pins 5 and 14. The minimum range required for
the Ambient Temperature Sensor is —40°F to 140°F.
A working Ambient Temperature Sensor is required for
the following:
•
Low Pressure Monitoring
•
Defrost (Heat Pump)
•
Comfort Control Display (Outdoor Air Temperature)
•
Aux Heat Control During Defrost (Heat Pump)
•
Aux Heat Lockout
•
Compressor Lockout (Heat Pump)
•
Oil Management
•
Humidifier Dew-Point Control
•
OD EEV Startup Position
•
ID EEV Startup Position
•
Pre Heating (Sump Heat)
•
Normal Operation of the ID and OD Fan
•
Diagnostics
5
4
3
2
1
13
12
11
10
4TWL9048A-SF-1C-EN
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