RC2-D Technical Manual
42
2.
Remove the bolts on the suction flange and stop valve, and remove the pipeline from the suction
port of the compressor to the suction stop valve.
3.
Take out the suction filter; after cleaning or replacement install the clean suction filter back, install
the suction pipe, and lock the bolt (Please do not miss the gasket. If it is damaged, please replace it).
4.
After the compressor is evacuated to -0.6Bar, open the valve closed before.
8.2.2
Common fault analysis
Below table lists some of the faults which occur in normal working condition and when it exceeds the
limit working condition. This table is only a guide for engineers to understand the faults on site.
Note:
The replacement of the internal parts of compressor must be carried out by the
person who has the service technical qualification certificate and understands Hanbell
screw compressor, or the service engineer of Hanbell.
Fault
Possible cause
1.
Tripping of
motor coil
temperature
protection
1. The refrigerant suction pressure too low; temperature too high (refrigerant
is insufficient or the suction filter blocked).
2. Too large motor load; insufficient cooling; liquid refrigerant injection device
is not installed or failure.
3. Coil protection switch failure.
4. Electrical system failure.
5. Poor motor coil or temperature too high.
6. Excessive suction superheat and poor heat dissipation.
2. Compress fail to
load
1. Ambient temperature too low; viscosity of lubricating oil too high.
2. Capillary blocked.
3. Discharge port of the capacity-control stuck and cannot be closed.
4. Capacity-control piston stuck
5. Capacity-control oil line stuck
6. Oil filter stuck
3. Compressor fail
to unload
1. The piston ring cannot be completely airtight, and a large number of
refrigerant come into the capacity-control oil cylinder
2. Capacity-control solenoid valve coil failure
3. The discharge side cover gasket is broken and the gaseous refrigerant enters
the oil cylinder.
4. The capacity-contorl solenoid valve coil voltage faulty
5. Capacity-control piston stuck
6. Poor control procedure
4. Poor insulation
of motor
1. Compressor motor wire connector wet or condensation
2. Poor compressor motor
3. Poor motor terminal or stuck by dust or foreign body.
4. Bad insulation of electromagnetic contactor
5. Internal acidification of the system which destroys insulation.
6. Long term coil running at high temperature, leading to insulation
deterioration.
7. Frequent startup, coil degradation.
8. Too much water contained in the refrigerant
Summary of Contents for RC2-D
Page 27: ...RC2 D Technical Manual 2 RC2 200 470 D S P terminal box 3 RC2 510 930 D S P terminal box ...
Page 45: ...RC2 D Technical Manual 47 RC2 180D S Drawing ...
Page 46: ...RC2 D Technical Manual 48 RC2 200 620D S Horizontal suction port Drawing ...
Page 48: ...RC2 D Technical Manual 50 RC2 620 930D S Vertical suction port Drawing ...
Page 49: ...RC2 D Technical Manual 51 10 2 RC2 100 930D P Drawing RC2 100 140D P Drawing ...
Page 50: ...RC2 D Technical Manual 52 RC2 180D P Drawing ...
Page 51: ...RC2 D Technical Manual 53 RC2 200 620D P Drawing ...
Page 53: ...RC2 D Technical Manual 55 RC2 620 930D P Drawing ...