Suction And Economizer Pressure Sensors; Thermistors; Discharge Gas Temperature - Carrier Pro-Dialog CONTROL 4 User Manual

3.2.3 - Suction Pressure and Economizer Pressure sensors
These are in the low pressure side. Suction pressure transducer takes the place of the low pressure switches,
low pressure gauges and the low pressure safety switch (where these are usually fitted). Economizer pressure is
used to measure the intermediary pressure between low and high pressure. The oil pressure is subtracted from
this pressure to determine the oil differential pressure for oil pressure safety purpose.
Carrier part: OP12DA040

3.3 - THERMISTORS

All thermistor, excepted the reset sensor, have similar characteristics (see next page).
They have Carrier Part No. HH 79 NZ 047

3.3.1 - Discharge gas temperature

This is installed on the discharge pipe of each compressor. It is used to control the discharge superheat. The
discharge gas temperature (lowest discharge compressor temperature or average discharge temperature of both
compressors) is subtracted to the saturated condensing temperature to determine the discharge superheat.
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CARRIER SA
30GX&HX PRO_DIALOG 4 V.2
5
4
3
2
1
20 40
0
138 276
Low pressure transducer curve
NOT TO BE DISCLOSED TO PERSONS OUTSIDE CARRIER ORGANIZATION
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USER'S GUIDE FOR
80 120
60 100 140
689
414 552 828
965
Pressure Pressure Pressure Pressure
© C .
ARRIER S A
ECG-UG-02-002
Page: 18/98
Rev: original
160 200 PSI
180
kPa
1103 1241 1379