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MCAC-CTSM-2018-1
Flooded type water cooled screw chiller (MIC)
53
High/low pressure switch
All compressors have factory-installed high/low-pressure switches. See Table.6.1
Table
– High/low-pressure switch settings
UNIT
High-pressure switch setting
Low pressure switch setting
Protection value
Reset Value
Protection value
Reset Value
LSBLG
***
/MCF
14bar
9bar
1bar
2bar
Table.6.1
If the high pressure switch is continuously open for 3s during operation, the compressor will shut down. A
manual reset of the control is required to restart the compressor. If the low pressure switch is
continuously open for 1s during operation, the compressor will shut down. It will reset automatically
when the fault is solved and cleared on the fault record page of touch screen. Sometimes if the
malfunction cannot be solved by resetting, consider replacing the pressure switches.
Evaporator protection: Low Chilled Leaving Water Temperature
PCB is programmed to shut the chiller down if the leaving water temperature drops below 4 °C. When
water temperature rises to 10
℃
, the safety resets and the chiller restarts. The chillers are equipped with
an antifreeze switch on the outlet of chilled water. If leaving water temperature is continuously lower than
3 °C for 3s during operation, the chiller will shut down. When water temperature rises to 10 °C, the chiller
resets, it needs manually reset on the touch screen.
IMPORTANT:
If unit is installed in an area where ambient temperature may fall below 32 F (0° C), a
suitable corrosion-inhibited antifreeze solution or auxiliary electric heater must be used in the chilled
water circuit.