Sterling A0544325 High Pressure Cutout, Low Pressure Cutout, Remote Start/Stop Interlock

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	15 psi (103 kPa)
A
SMC100	15 psi (103 kPa)
A
SMC150	35 psi (241 kPa)
A

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.

Page 18 SMC Series Chillers