Nidec Embraco CF01F - Page 46

5.2.3. Troubleshooting – Compressor stalls after some minutes of
operation
Problem
Action
Discharge pressure imposed by the system is high above the
compressor limit (application envelope) due to improper
design of condenser lacking area to dissipate the heat.
Increase the condenser area;
Check operation of the condenser
fan;
Discharge pressure imposed by the system is high above the
compressor limit (application envelope) due to excessive
pressure drop along the condenser.
Increase tube diameter of the
condenser to reduce pressure drop.
Discharge pressure imposed by the system is high above the
compressor limit (application envelope) due to the presence of
contaminants in the circuit (non-condensable gases).
Repeat the refrigerant charge
procedure replacing the filter dryer.
Discharge pressure imposed by the system is high above the
compressor limit (application envelope) due to excessive
refrigerant charge.
Reduce the refrigerant charge.
Discharge pressure imposed by the system is high above the
compressor limit (application envelope) due to the capillary
tube too restrictive.
Increase the capillary tube mass
flow rate to decrease the discharge
pressure peak below the envelope
limit.
Suction pressure imposed by the system is high above the
compressor limit (application envelope) due to excessive
refrigerant charge.
Reduce the refrigerant charge.
Suction pressure imposed by the system is high above the
compressor limit (application envelope) due to the capillary
tube is too wide.
Restrict the capillary tube mass flow
rate to decrease the evaporation
temperature below the envelope
limit.
Suction pressure imposed by the system is high above the
compressor limit (application envelope) due to a very wide
evaporator area (to increase the evaporation temperature
during steady-state but imposing a temperature above the
envelope during transients).
Redesign the evaporator (smaller);
Increase compressor speed;
Restrict the capillary tube;
Inverter shutting down due to excessive niche temperature.
Improper installation of the
appliance not respecting the air
circulation demands;
Condenser fan damaged;
Table 25 – Compressor stalls after some minutes of operation
46