Dual electronic expansion valve module, Troubleshooting, Technical guide 20 – Orion System Dual Electronic Expansion Valve Module User Manual
Page 20
Dual Electronic Expansion Valve Module
Technical Guide
20
Troubleshooting
OE275-01 Suction Pressure Transducer
Testing for R410A Refrigerant
The Evaporator Coil Temperature is calculated by converting the Suc-
tion Pressure to Temperature. The Suction Pressure is obtained by using
the OE275-01 Suction Pressure Transducer, which is connected into the
Suction Line of the Compressor.
The Suction Pressure and Calculated Temperature is displayed in the
Module’s Status Screens. A voltage measurement can also be taken on
input for verifi cation.
The Suction Pressure Transducer must have a 5 volt supply voltage to
work properly. A measurement can be taken on the +5V terminal for
verifi cation.
Use the voltage column to check the Suction Pressure Transducer while
connected to the Dual Electronic Expansion Valve Module. Read voltage
with a meter set on DC volts. If the temperature/voltage or pressure/volt-
age readings do not align closely with the chart, your Suction Pressure
Transducer is probably defective and will need to be replaced.
See the OE275-01 Suction Pressure Transducer, Pressure, Temperature,
and Voltage Chart for R410A Refrigerant testing (Table 4). The chart
shows a temperature range from 20°F to 80°F. For troubleshooting pur-
poses, the DC Voltage readings are also listed with their corresponding
temperatures and pressures.
Table 4: Coil Pressure/Voltage/Temp for OE275-01
Suction Pressure Transducers - R410A Refrigerant
OE275-01 Suction Pressure Transducer Coil Pressure
– Temperature – Voltage Chart for R410A Refrigerant
T
emperature
°F
Pressure
PSI
Signal
DC V
olts
T
emperature
°F
Pressure
PSI
Signal
DC V
olts
21.19
80.94
1.8
59.03
168.10
3.2
24.49
87.16
1.9
61.17
174.32
3.3
27.80
93.39
2.0
63.19
180.55
3.4
30.99
99.62
2.1
65.21
186.78
3.5
33.89
105.84
2.2
67.23
193.00
3.6
36.80
112.07
2.3
69.24
199.23
3.7
39.71
118.29
2.4
71.15
205.46
3.8
42.30
124.52
2.5
72.95
211.68
3.9
44.85
130.75
2.6
74.76
217.91
4.0
47.39
136.97
2.7
76.57
224.14
4.1
49.94
143.2
2.8
78.37
230.36
4.2
52.23
149.42
2.9
80.18
236.59
4.3
54.50
155.65
3.0
56.76
161.88
3.1