Lennox EMEA HYDROLEAN, Инструкция по установке, эксплуатации и обслуживанию

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TROUBLESHOOTING – REPAIRS
CHILLER-IOM-2004-E
50
PROBLEMS
– SYMPTOMS
PROBABLE CAUSE RECOMMENDED ACTION
J. DISCHARGE PRESSURE IS TOO LOW
•
Water is very cold at condenser outlet
•
Condenser water flow too high or
water temperature is too low
•
Adjust the pressure operated water
valve or the thermostat on the cooling
tower/ dry cooler
•
Bubbles in sight glass
•
Low refrigerant charge
•
Repair the leak and add refrigerant
K. SUCTION PRESSURE IS TOO HIGH
•
The compressor runs continuously
•
Too much cooling demand on the
evaporator
•
Check the system
•
Suction line unusually cold.
Liquid refrigerant returns to compressor
•
Expansion valve opened to far
•
Adjust superheat and check that the
expansion valve bulb is correctly fitted
in place. Check parameters for
electronic expansion valve.
•
Expansion valve blocked in open
position
•
Repair or replace
L. SUCTION PRESSURE IS TOO LOW
•
Bubbles in sight glass
•
Low refrigerant charge
•
Repair the leak and add refrigerant
•
Excessive pressure drop across the
filter- drier or the solenoid valve
•
Filter-drier obstructed
•
Replace the cartridge
•
No refrigerant passing through the
expansion valve
•
Expansion valve bulb has lost its
charge.
•
Replace the bulb
•
Loss of capacity
•
Expansion valve obstructed
•
Clean or replace
•
Conditioned space too cold
•
Control thermostat contacts stuck in
closed position
•
Repair or replace
•
Compressor short-cycling
•
Capacity modulation setting too low
•
Adjust
•
Superheat value too high
•
Excessive pressure drop in the
evaporator
•
Check the external equalizing line on
the expansion valve
•
Low pressure drop in the evaporator
•
Low water flow
•
Check water flow. Check the condition
of the filters, look for obstructions in the
chilled water circuit piping