PCA Series Chillers Page 19
3-3 High Pressure Cutout
The high pressure cutout is an electro-mechanical safety feature that opens the control
circuit if the system condensing pressure exceeds a safe level. The chiller will
automatically restart when the pressure drops back to an acceptable level.
Model Cuts out if condensing pressure exceeds:
PCA050 275 psi (1,897 kPa)
PCA100 275 psi (1,897 kPa)
PCA150 400 psi (2,759 kPa)
IMPORTANT!
Call a refrigeration service technician to analyze
the problem if high pressure recurs.
3-4 Low Pressure Cutout
The low pressure cutout is an electro-mechanical safety feature that prevents
compressor suction pressure from dropping below a preset point.
It is factory set to open the control circuit when pressure drops below a safe level. The
chiller will automatically restart when the suction pressure reaches an acceptable level.
Model Cuts out if suction pressure falls below:
PCA050 15 psi (103 kPa)
PCA100 15 psi (103 kPa)
PCA150 35 psi (241 kPa)
3-5 Remote Start/Stop Interlock
A contact is provided to allow interlocking of the PCA Series Chiller with process
controls. To use this feature, remove the jumper between Terminals X1 and 1 on
Terminal Block 1. Supply a switch or dry contact interlock connected in series between
these two terminals. See Figure 15 and Figure 16 on pages 34 and 35 for more
information.
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