Overheating can occur when the oil in a compressor is insufficient or heated to the point when it loses its ability to act as a lubricant.
If the heat is excessively high, chemically the oil breaks down. Other reasons for overheating due to discharge temperatures could be as under:
- Low suction pressure
- High condensing pressure
Low suction pressure generally occurs due to:
- Pressure drop in the suction line
- Light load operating conditions
- Choked/restricted evaporators
High condensing pressures could be taking place due to:
- Inadequate airflow around/through the condenser
- Undersized condenser
- Overcharge of refrigerant
- Presence of non-condensable gases in the refrigeration system
High-pressure ratio is caused due to low suction pressure and/or high condensing pressure.
If the compressor is operated within our specified limits, this condition will not arise.