MCAC-2008-11 Air-cooled Modular Chiller
32
Refrigerant over-charged Discharge the additional refrigerant
High surrounding Temp Measure the surrounding Temp
Surrounding Temp. is lower Measure the surrounding Temp
Refrigerant leak or insufficient Leak-hunting or recharging
Low discharge pressure
(Cooling)
Low suction pressure Refer to the “low suction pressure”
Refrigerant over-charged Discharge the additional refrigerant
High suction pressure
(Cooling)
High Temp. of the inlet chilled-water
Check the heat insulation of water
pipeline
Insufficient water flow
Measure the Temp difference between
inlet and outlet water, adjust the water
flow
Low Temp. of inlet chilled-water Check installation
Refrigerant leak or insufficient Leak-hunting or recharging
Low suction pressure
(Cooling)
Scaling in the evaporator Descaling
Water flow Insufficient
Measure the Temp difference between
inlet and outlet water, adjust the water
flow
Air or other gas enter the system
Discharge the gas from refrigerant
charging hole, re-vacuuming if
necessary.
Scaling in the waterside heat-
exchanger
Descaling
High Temp of outlet cooling water Check the water Temp
High discharge pressure
(Heating)
High suction pressure Refer to “high suction pressure” part
Low Temp of cooling water Check the Temp of cooling water
Refrigerant leak or insufficient Leak-hunting or recharging
Low discharge pressure
(Heating)
Low suction pressure Refer to “low suction pressure” part
High surrounding Temp Measure the surrounding Temp High suction pressure
(Heating)
Refrigerant over-charged Discharge the additional
Refrigerant insufficient Recharging
Air flow insufficient Check the running direction of the fan
Short cycle of air flow
Find the reason which causes short
cycle, then eliminate it
Low suction pressure
(Heating)
Defrosting insufficient
Four-way valve or heat-sensitive
resistance failure, replace them if
necessary
Chilled-water insufficient
Failure of the water pump or water flow
switch, maintain or replace them if
necessary
Air enters the water system Discharge the air
Compressor stops by anti-freeze
protection
(Cooling)
Failure of the heat-sensitive resistance If failure confirmed, replace it.
High discharge pressure Refer to “high discharge pressure”
Compressor stops by High-pressure
protection
High-pressure switch failure
If failure confirmed, maintain or replace
it if necessary
High-pressure both of discharge and
suction
Refer to “high discharge pressure” or
“low suction pressure” parts.
High or low voltage, single phase or
unbalance of the phases
Check the voltage which should never
exceed or below 20V to the rating.
Short circuit of the motor or terminals
Check the motor and the corresponding
resistance of the terminals
Compressor stops by the
overload protection
Over-load component failure Replace it
High or low voltage
Check the voltage which should never
exceed or below 20V to the rating.
High discharge pressure or low suction
pressure
Refer to “high discharge pressure” and
“low suction pressure” parts.
Compressor stops by the inner Temp
sensor or high discharge Temp
protection.
Components failure
Check the inner Temp sensor, when the
motor is cool
Filter blocked before (or after) electric
expansion valve
Replace filter
Compressor stops by the low-pressure
protection
Low-pressure switch failure If failure is confirmed, replace it.
To Next Page
Loading...
Need help?
General