MCAC-2008-11 Air-cooled Modular Chiller
33
Low suction pressure Refer to “low suction pressure” part.
Compressor liquid pumping caused by
the entrance of liquid refrigerant.
Adjust the refrigerant volume, check
expansion valve and suction gas
degree of superheat.
Abnormal noise caused by
compressor
Compressor aging Replace compressor
Panel bolt loosed Fix all components
Other abnormal noise
Insufficient strength of the installation
foundation.
Refer to “Unit installation” part
Current relay open, burning the fuse. Replace the invalid components
Open circuit of the control wire Check the control system connection
High or low-pressure protection
Refer to the parts above about the
failures caused by suction and
discharge pressure
Contactor wire burn out Replace the invalid components
Contactor wire burn out
Exchange any two of three phases with
each other.
Water system failure Check water system
Failure code displayed by the wire
controller.
Confirm the type of failure and take the
corresponding measure.
“OFF” signal input of “ON/OFF” port
Check the “ON/OFF” port signal，it’s
“ON” normally.
Compressor can’t start
Multiple connection failure of “ON/OFF”
port when combination with several
modules.
Check the “ON/OFF” port multiple
connection wiring in every module,
confirm the “red-to-red” and “blue to
blue” correspondence
Four-way valve or heat-sensitive
resistance failure.
Short cycle of the air flow
Air-side heat-exchanger over-frosted
Short cycle of the air flow
Check the system; eliminate the failure
causing short cycle.
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