CVHE-SB-32A 88
Troubleshooting The Percent Condenser Output:
1 While the unit is running, hook up a DC Volt meter between Circuit module terminals J7-1 and
J7-2
2 Select ‘% cond’ for the Rfgt Pressure Output Option in the Field Startup menu.
3 View the High Pressure cutout setting in the machine configuration menu.
4 View the condenser refrigerant pressure in the refrigerant report.
5 The voltage reading on the voltmeter should correspond to the following graph within 5
percent.
Note: The zero point on the graph corresponds to 0 PSIA.
The transfer function is 2 to 10 VDC corresponding to 0 Psia to the HPC setting (psig) plus the
local atmospheric pressure setting or, said another way, 0 Psia to HPC in psia. The Percent
Condenser Pressure indication output is based on the Condenser Refrigerant Pressure sensor if
the Condenser Pressure Option is selected as 'Installed' at the CLD. The Percent Condenser
Pressure indication output is based on the Saturated Condenser Refrigerant Temperature
sensor if the Condenser Pressure Option is selected as ' Not Installed' at the CLD.
From UCP2 Initial Release (July 93) to 10/21/96 Software Release:
When a Temperature Sensor Only is Used and A Temperature to Pressure Conversion is
Made: If the Condenser Saturated Temperature Sensor goes out of range due to an open or
short, a pressure sensor diagnostic will be called and the output will also go to the respective
out of range value. That is, for an out of range low on the sensor, the output will be limited to
2.0 VDC. For an out of range high on the sensor, the output will be limited to 10.0 VDC.
When a Condenser Pressure Sensor is Used (Optional): If the Condenser Pressure sensor
goes out of range, like due to an open or short, a pressure sensor diagnostic will be called
% HPC vs Voltage
2
3
4
5
6
7
8
9
10
0 12.5 25 37.5 50 62.5 75 87.5 100
% HPC
Voltage
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