CD 30 ÷ 520
41
14. Troubles and solutions
Troubles Possible reasons Solutions
High discharge
pressure
(Cooling)
Air or other gas enter the system
Fins are dirty or jammed by some
obstacles
The condenser wind flow is
insufficient or motor fail
High suction pressure
Refrigerant over-charged
High surrounding Temp
Discharge the gas from refrigerant
charging hole, re-vacuuming if
necessary
Clean the fins of condenser
Query the condenser motor, repair it
if necessary
Refer to the “high suction pressure”
part.
Discharge the additional refrigerant
Measure the surrounding Temp
Low discharge
pressure
(Cooling)
Surrounding Temp is lower
Refrigerant leak or insufficient
Low suction pressure
Measure the surrounding Temp
Leak hunting or recharging
Refer to the “low suction pressure”
High suction
pressure
(Cooling)
Refrigerant over-charged
High Temp of the inlet chilled-water
Discharge the additional
Query the heat insulation of water
pipeline
Low suction
pressure
(Cooling)
Insufficient of water flow
Low Temp of inlet chilled-water
Refrigerant leak or insufficient
Scaling in the evaporator
Measure the Temp difference
between inlet and outlet water, adjust
the water flow
Query installation
Leak hunting or recharging
Descaling
High discharge
pressure
(Heating)
Water flow Insufficient
Air or other gas enter the system
Scaling in the heat exchanger of
waterside
High Temp of outlet cooling water
High suction pressure
Measure the Temp difference
between inlet and outlet water, adjust
the water flow
Discharge the gas from refrigerant
charging hole, re-vacuuming if
necessary.
Descaling
Query the water Temp
Refer to “high suction pressure” part
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