RSMD Technical Guide
TROUBLESHOOTING
23
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 RSMD Module(s). The VCC-X/VCCX2 and the
RSMD Module(s) must be powered for this test. Read voltage with
a meter set on DC volts. Place the positive lead from the meter on
the SP1/SP2 terminal located on the RSMD Module(s) terminal
block. Place the negative lead from the meter on the ground (GND)
terminal located adjacent to the SP1/SP2 terminal on the RSMD
Module(s) 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 SP1/
SP2 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.
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 3: 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
Temperature
°F
Pressure
PSI
Signal
DC Volts
Temperature
°F
Pressure
PSI
Signal
DC Volts
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
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