Hanbell RC2-F Series, Manual

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7.4 Troubleshooting
The table below shows some problem that might encounter in the jobsite during commissioning or upon operation
of compressor. This table will only serve as a guide for the Engineer to understand the situation once the problem
occurred in the site.
PROBLEMS PROBABILITY CAUSES REMEDY / CORRECTIVE ACTION
Sudden trip of motor
thermister / sensor
Low suction pressure cause low refrigerant flow rate Install liquid injection to motor coil
Refrigerant shortage Charge refrigerant
Suction filter clogged Clean filter
High suction temperature Install liquid injection to motor coil
High suction superheat Adjust the superheat less than 10°K
Unstable electricity system or failure Check electricity power supply
Motor overload
Bad motor coil causing temperature rising rapidly
Compressor unable
to load
Low ambient temperature or high oil viscosity. Turn on the oil heater before compressor start.
Capillary clogged. Clean or replace capillary
Modulation solenoid valve clogged or solenoid valve coil burnt.
Clean / purge solenoid valve core or replace the
solenoid valve coil
Internal built-in oil line clogged. Check and clean the compressor oil circuit
Piston stuck-up. Change piston or piston ring
Oil filter cartridge clogged. Clean oil filter (replace if needed)
Too small the high-low pressure differential.
Minimum pressure differential is 4 bar. Consider to
install an oil pump.
Compressor unable
to unload.
Modulation solenoid valve clogged or burnt. Clean or replace the solenoid valve
Piston rings worn off or broken, or cylinder damaged resulting leakage.
Change piston (if cylinder damaged severely, change
the cylinder)
Lubrication oil insufficient
Check the oil level of the compressor if enough, add
some oil if necessary
Leakages at internal discharge cover plate end side. Check or replace the gasket and tighten the bolts.
Solenoid valve voltage misused. Check the control voltage
Piston stuck-up.
Change the piston set, and check the cylinder and slide
valve.
Capacity control logic unsuitable. Check
Poor insulation of
motor
1. Bad compressor motor coil.
Check the coil or change the motor stator
2. Motor power terminal or bolt wet or frosty.
3. Motor power terminal or bolt bad or dusty.
4. Bad insulation of magnetic contactors.
5. Acidified internal refrigeration system.
6. Motor coil running long time continuously under high temperature.
7. Compressor restart counts too many times.