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SMC Series Chillers
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:
SMC050A 275 psi (1,897 kPa)
SMC100A 275 psi (1,897 kPa)
SMC150A 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:
SMC050
A
15 psi (103 kPa)
SMC100
A
15 psi (103 kPa)
SMC150
A
35 psi (241 kPa)
3-5 Remote Start/Stop Interlock
A contact is provided to allow interlocking of the SMC 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 Figures 14
and 15 on Pages 32 and 33 for more information.