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Coil and Suction Temperature
Sensor
Figure 5. Coil Temperature Sensor
Pins 2 & 11 (Yellow)
9
8
7
6
5
18
17
16
15
14
4TWL9048A-SF-1C-EN
4
3
2
1
13
12
11
10
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
A working 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)
9
8
7
6
18
17
16
15
14
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
A working Suction Temperature Sensor is required for:
•
Outdoor EEV Control (Target Super Heat)
•
Diagnostics; Charge level, Indoor/Oudoor Airflow
S S E E N N S S O O R R S S
5
4
3
2
1
13
12
11
10
15
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