Orion System VCC-X Controller - Manual (Page 80)

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APPENDIX A - SYSTEM CONFIGURATIONS
VCC-X Controller Technical Guide 80
OE275-01 Suction Pressure Transducer Testing
OE275-01 Suction Pressure
Transducer Testing for R410A
Refrigerant
The Evaporator Coil Temperature is calculated by converting the
Suction 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.
Use the voltage column to check the Suction Pressure Transducer while
connected to the VCC-X Expansion Module. The VCC-X and the
VCC-X Expansion Module must be powered for this test. Read
voltage with a meter set on DC volts. Place the positive lead from
the meter on the PR OUT terminal located on the VCC-X Expansion
Module terminal block. Place the negative lead from the meter on
the ground (GND) terminal located adjacent to the PR OUT terminal
on the VCC-X Expansion Module terminal block. Use a refrigerant
gauge set and/or an accurate electronic thermometer to measure the
temperature or suction line pressure near where the Suction Pressure
Transducer is connected to the suction line. Measure the Voltage at
the terminals PR OUT and GND terminals and compare it to the
appropriate chart depending on the refrigerant you are using. If
the temperature/voltage or pressure/voltage 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
9). The charts show a temperature range from 20°F to 80°F. For
troubleshooting purposes, the DC Voltage readings are also listed
with their corresponding temperatures and pressures.
Table 9: 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
Temper
atur
e
°F
Pr
essur
e
PSI
Signal DC V
olts
Temper
atur
e
°F
Pr
essur
e
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