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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.
PCA050
PCA100
PCA150
Call a refrigeration service technician to analyze
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.
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.
PCA Series Chillers
Model
Cuts out if condensing pressure exceeds:
IMPORTANT!
the problem if high pressure recurs.
Model
Cuts out if suction pressure falls below:
PCA050
PCA100
PCA150
275 psi (1,897 kPa)
275 psi (1,897 kPa)
400 psi (2,759 kPa)
15 psi (103 kPa)
15 psi (103 kPa)
35 psi (241 kPa)
Page 19
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