4TWL9048A-SF-1C-EN
15
Coil and Suction Temperature
Sensor
7(03 ) 7(03 &
7+(50,6725
5(6,67$1&(
2+06
92/76 '&
Figure 5. Coil Temperature Sensor
Pins 2 & 11 (Yellow)
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The Coil Temperature Sensor control has an NTC
thermistor input for sensing the coil temperature. This
reading is used by the defrost algorithm on heat pump
units. The thermistor has a nominal resistance of 10k
ohms at 75°F. The minimum range and resolutions as
measured across pins 2 and 11 required for Coil
Temperature Sensor is —50°F to 150°F
Aworking Coil Temperature Sensor is required for the
following:
•Defrost Initiation and Termination
•Compressor Sump Heat (Preheating)
•Diagnostics;Charge Level, Indoor/Outdoor Airflow
Figure 6. Suction Temperature Sensor
Pins 3 & 12 (Orange)
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101112131415161718
The Suction Temperature Sensor control utilizes an
NTC thermistor input for sensing the suction/gas
temperature. The thermistor has a nominal resistance
of § 10k ohms at 75°F. The minimum range and
resolutions as measured across pins 3 and 12 required
for the Suction Temperature Sensor is —50°F to 150°F
Aworking Suction Temperature Sensor is required for:
• Outdoor EEV Control (Target Super Heat)
•Diagnostics;Charge level, Indoor/Oudoor Airflow
SSEENNSSOORRSS
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