38
Troubleshooting and Diagnostics
H. Inadequate air cooling capacity
I. Too low suction pressure
J. Too high suction pressure
K. Too low discharge pressure
Possible cause
Solution
Insufficient coolant (low superheat degree and
supercooling degree)
Supply coolant.
Blocked dry filter (temperature from coolant pipe to dryer
room is changed)
Change the dry filter
Improper regulation of expansion valve
Regulate the expansion valve again.
Blocked expansion valve (too high superheat degree and
too high water temperature)
Repair or change the expansion valve.
Too low water flow of evaporator
Check the filter screen and regulate water flow.
Non-condensed gas in the system
Vacuumize the system and re-fill it with the coolant.
Leak of compressor valve and high suction pressure (high
high-pressure pressure, and low low-pressure pressure)
Change the compressor
Possible cause
Solution
Insufficient charge of coolant (high superheat degree and
low supercooling degree)
Identify the leak point, repair it, and recharge the coolant.
Too low setting of temperature switch (too low low-
pressure pressure and too low outlet water temperature) Regulate the temperature switch again.
Too low cold water flow
Check whether the filter screen is blocked and whether the
balance valve is correctly set.
Blocked dry filter
Check whether the dry filter is frosted, and if necessary, change it.
Blocked expansion valve (high superheat degree)
Clean or change the expansion valve.
Possible cause
Solution
Inadequate coolant (high superheat degree, low
supercooling degree and air bubbles in the sight glass)
Identify the leak point, repair it, and recharge the coolant.
Rupture or leak of vent valve of compressor
Change the compressor
Poor low voltage switch
Change the poor control element.
Ensure minimum operating environmental temperature.
Exercise proper discharge pressure control or provide an ambient
temperature locking switch
Possible cause
Solution
Too high cooling load (high supply water temperature)
Please refer to Section E.
Excessive liquid feed of expansion valve (too low
superheat degree, leading to overflowing of liquid onto the
compressor)
Regulate superheat setting and check whether the thermo probe
is mounted in the gas line.
Rupture of air suction valve (high noise of compressor)
Change the compressor
Содержание Koolman R410A
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