• 34 • Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 0105-E
TROUBLESHOOTING - REPAIRS
8.1 LIST OF THE MOST COMMON PROBLEMS - continued
PROBLEMS – SYMPTOMS PROBABLE CAUSE RECOMMENDED ACTION
B) THE COMPRESSOR DOES NOT START
- Low pressure safety switch trip
out
- Check low pressure safety
switch differential
- Normal operation with too
frequent starts and stoppages
due to action of the low pressure
safety switch. Bubbles in
sightglass..
Or, normal compressor
operation, but the low pressure
safety switch trips out and
resets frequently
- Low refrigerant charge
- Check the charge through the
sightglass on the liquid line,
carry out a leak test, then top up
the refrigerant charge
- Filter-drier obstructed
- Check the state of the drier and
replace the filter
- Solenoid valve closed - Check that the valve is operating
properly
- Expansion valve closed - Check bulb and capillaries,
operation of the valve
- Suction pressure too low, Filter
drier frozen up
- Compressor suction valve - Check the filter
C) THE COMPRESSOR SHORT CYCLES ON HIGH PRESSURE SAFETY SWITCH TRIP OUT
- High pressure safety switch trip
out
- Check high pressure safety
switch differential
- Low air/water flow in condenser
or dirty condenser coil (poor
heat exchange)
- Check that pumps are operating
correctly or the state of
cleanliness of the coils / check
fan operation
- Incondensibles in the
refrigeration circuit
- Bleed from circuit and top up the
refrigerant charge.
Note : it is not permitted to
discharge refrigerant to
atmosphere
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