18
4T-V8-SF-1M-EN
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
7(03 ) 7(03 &
7+(50,6725
5(6,67$1&(
2+06
92/76 '&
Figure 7. Ambient Temperature Sensor
Pins 5 & 14 (Black)
Integrated Variable Speed Control Board
J1
123456789
101112131415161718
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
SSEENNSSOORRSS
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