Download Print this page

Chiller Problems And Actions - LG RCWW Operation & Maintenance Manual

Water-cooled screw chiller
Hide thumbs

Advertisement

8-2. Chiller problems and actions

Problems
1) Air or non condensing gas exists in the sys-
tem
2) Cooling water inlet temperature is high or
cooling water flow rate passing through con-
denser is insufficient.
3) Condenser tubes are covered with scales,
Discharge temper-
ature is excessively
lime, corrosion, etc.
high
4) Water pump defect
5) Excess refrigerant which causes liquid re-
frigerant to be concentrated to condenser
tubes
6) Condenser's gas inlet valve is not fully open
7) Suction pressure is higher than normal.
1) Excessive flow or low temperature of the
water which passes through condenser
2) Oil bubble caused by the liquid refrigerant
flow from evaporator to compressor
Discharge temper-
ature is excessively
3) Liquid outlet valve of condenser is leaking.
low
4) Suction pressure is lower than normal.
5) Due to insufficient amount of refrigerant,
gas refrigerant is entering into liquid pipe.
1) Discharge pressure is excessively high.
2) Refrigerant is overcharged.
Suction pressure is
3) Liquid refrigerant flowing from evaporator to
excessively high
compressor
4) Defective insulation in chilled water pipe
1) Condenser's liquid outlet valve is not fully
open
2) Liquid pipe or suction pipe is blocked.
3) Defective expansion device or improper ad-
justment
4) Insufficient amount of refrigerant
Suction pressure is
5) Excessive amount of oil in the lubrication
excessively low
cycle
6) Chiller inlet temperature is lower than the
standard value
7) Insufficient amount of chilled water passing
through evaporator
8) Discharge pressure is excessively low.
1) Insufficient amount of cooling water
2) Condenser is blocked, inlet valve interrupted
High pressure
3) High pressure prevention valve setting is ab-
valve operated
normal.
4) Charged amount of refrigerant is excessive.
Cause
8. TROUBLESHOOTING
Action
1) Discharge from condenser
2) Control the water system, check operation
status of cooling tower fan, check filter in
the pipeline
3) Clean tubes
4) Check cooling water pump
5) Discharge excessive amount of refrigerant
6) Open valve
7) Refer to 'Suction pressure excessively high'
1) Adjust water valve, or control break valve:
Check operation condition of cooling tower
fan
2) Check and adjust expansion valve, check
whether the sensor on the inlet pipe is fixed
firmly and insulated, and check whether
cooling water's inlet temperature is higher
than limit value.
3) Check condenser operation status, if re-
quired, replace outlet valve.
4) Refer to 'Suction pressure is excessively
low'
5) Charge sufficient amount of refrigerant.
1) Refer to 'Discharge pressure is excessively
low'
2) Discharge excessive amount of refrigerant
3) Check and adjust expansion valve, check
whether the sensor on the inlet pipe is fixed
firmly and insulated, and check whether
cooling water's inlet temperature is higher
than limit value.
4) Check insulation condition of pipeline
1) Open valve
2) Check refrigerant filter
3) Control the degree of superheat accurately
and check whether there is leakage in tem-
perature package.
4) Refrigerant leakage test
5) Check oil amount
6) Set temperature control
7) Pressure loss in chilled water pipeline
8) Adjust water system valve
1) Check water system valve
2) Check facts about tube of condenser and
water valve Identitify the cause of the pres-
sure
3) Check the value of the setting
4) Check charged amount of refrigerant
115

Advertisement

loading

  Related Manuals for LG RCWW

  Related Content for LG RCWW

This manual is also suitable for:

Lcww