Orion System VCM-X E-BUS Component - Manual (Page 126)

VCM-X Component & Systems Wiring 126
Miscellaneous Diagrams and Technical Information
OE275-01 Suction Pressure Transducer Testing
OE275-01 Suction Pressure
Transducer Testing for R22 and 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 con-
nected into the Suction Line of the Compressor.
Use the voltage column to check the Suction Pressure Transducer while
connected to the VCM-X Expansion Module. The VCM-X and the
VCM-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 VCM-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 VCM-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 defec-
tive and will need to be replaced.
See the OE275-01 Suction Pressure Transducer, Pressure, Tem-
perature, and Voltage Chart for R22 and R410A Refrigerant testing
(Tables 8 and 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.
OE275-01 Suction Pressure Transducer
Coil Pressure -
Temperature – Voltage Chart for R22 Refrigerant
Temper
at
ur
e
°F
Pr
essur
e
PSI
Signal DC V
olts
Temper
at
ur
e
°F
Pr
essur
e
PSI
Signal DC V
olts
20.00 31.13 1.0 55.32 93.39 2.0
20.00 37.36 1.1 58.86 99.62 2.1
20.46 43.58 1.2 62.13 105.84 2.2
25.71 49.80 1.3 65.27 112.07 2.3
30.84 56.03 1.4 68.42 118.29 2.4
35.41 62.26 1.5 71.39 124.52 2.5
39.98 68.49 1.6 75.20 130.75 2.6
44.00 74.71 1.7 77.00 136.97 2.7
48.00 80.94 1.8 79.80 143.20 2.8
51.78 87.16 1.9 80.00 149.42 2.9
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