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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
Low pressure transducer curve
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.
CARRIER SA
USER'S GUIDE FOR
30GX&HX PRO_DIALOG 4 V.2
ECG-UG-02-002
Rev: original
Page: 18/98
©
C
ARRIER
S
.
A
NOT
TO
BE
DISCLOSED
TO
PERSONS
OUTSIDE
CARRIER
ORGANIZATION
20
40
60
80
100
180
200
276
828
965
1241
1103
4
2
0
Vo
lt
a
g
e (
VDC)
Vo
lt
a
g
e (
VDC)
Vo
lt
a
g
e (
VDC)
Vo
lt
a
g
e (
VDC)
kPa
PSI
3
1
5
1379
689
138
414
Pressure
Pressure
Pressure
Pressure
552
140
120
160
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