Flooded type water cooled screw chiller (PCB Control) MCAC-CTSM-2012-11
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18) Measuring tape, for measuring distance and length, etc.
II. Common items and application:
1) Copper nut, incl. metric and British systems, for making connective pipe with copper pipe.
2) Gasket cardboard, for making gasket seal as sealing is frequently required during maintenance
and service.
3) PTFE tape, for tightening nut, connection, etc.
4) Insulating tape
5) Tighten strip, for tightening wire or sensor, etc.
The above are only common tools and materials. Exceptional cases require particular
considerations.
2.2 Protection items and Troubleshooting
Midea screw chiller has many protection measures and devices. There’re many features to aid in
troubleshooting. By using the alarm information, DI/O, AI/O and operating conditions of the chiller
during chiller operation, it’s convenient to find the possible problem. Verify that the chiller is properly
configured, including options and/or accessories.
Protection items:
Protection Purpose
High pressure / low pressure
protection of compressor
Ensures the compressor runs in normal range and
ensures its work life.
Converse phase, lack of phase
protection
Protects the compressor from damage because of
converse phase or lack of phase of power.
Anti-freezing protection during
refrigeration
Protects the key components such as evaporator,
condenser and water pipe etc. from damage because of
the expanse caused by the water becomes into ice
Overload protection Protects the compressor from burn due to overload
running.
Over current protection of
compressor
Protects the compressor from burn due to over current
running under bad conditions.
Internal protection Makes the compressor run safely under permitted
conditions.
Anti-overheating protection of system Protects the compressor from burn because of running
lack of refrigerant orlubricating oil.
Water flow switch protection Protects the compressor and the water pump motor from
burn because there is lack of cooling water or chilled
water.
Protection of sensor fault Ensures the data from sensor is correct to prevent the
system from wrong action.
Oil level and oil pressure difference
protection
Ensures the compressor to run normally.
High discharge temperature
protection
Makes the compressor run safely under permitted
conditions.
Phase reversal/phase loss (phase protection)
Power supply A/B/C should exist simultaneously and differ from each other by 120° phase angle. If
not, Phase reversal or phase loss fault will occur and be displayed on screen. Before unit start when
Phase reversal or phase loss fault occurs, the chiller won’t start; when Phase reversal or phase loss
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