Trane 4TWL9048A1000A - Ambient Temperature Sensor (ODS)

14
4TWL9048A-SF-1C-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 4. Ambient Temperature Sensor
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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.
Aworking Ambient Temperature Sensor is required for
the following:
•LowPressure Monitoring
•Defrost (Heat Pump)
•Comfort Control Display (Outdoor Air Temperature)
•AuxHeat Control During Defrost (Heat Pump)
•AuxHeat Lockout
•Compressor Lockout (Heat Pump)
• Oil Management
•H
umidifier Dew-Point Control
• OD EEV Startup Position
• ID EEV Startup Position
•Pre Heating (Sump Heat)
•Normal Operation of the ID and ODFan
•Diagnostics
SSEENNSSOORRSS