What causes low suction pressure with high superheat in Carrier Refrigerator?
If your Carrier Refrigerator shows low suction pressure with high superheat, potential causes include low refrigerant charge (6.7.1), a plugged external equalizer line (open it), wax, oil, or dirt plugging the valve or orifice, ice formation at the valve seat (6.14), incorrect superheat (6.7.1), or power assembly failure (66.1144).
What causes high suction pressure with low superheat in Carrier Refrigerator?
If your Carrier Refrigerator has high suction pressure with low superheat, the superheat setting may be too low (6.14), the external equalizer line may be plugged or ice is holding valve open, or there may be foreign material in the valve (6.14).
General| Brand | Carrier |
|---|---|
| Model | Streamline Scroll 69NT20-531-300 |
| Category | Refrigerator |
| Language | English |
General safety notices supplementing specific warnings and cautions for operation and maintenance.
Precautions for safe operation of the unit, including safety glasses and working in pairs.
Precautions for maintenance, emphasizing power disconnection and securing the unit.
Listing of specific warnings and cautions applicable to the refrigeration unit.
Controller monitoring of compressor temperatures and pressures for protection.
Information on controller alarms, their generation, and display.
Details the independent controller function for automatic or manual pre-trip testing.
Overview of the DataCORDER software for temperature recording and parameter logging.
Pre-operation inspection checklist for the refrigeration unit and container.
Instructions for safely starting and stopping the unit.
Steps for performing a start-up inspection of the unit.
Details automatic testing of unit components using internal measurements.
Troubleshooting for units that fail to start or stop intermittently.
Troubleshooting for units that run continuously during cooling operation.
Troubleshooting for units that run but do not provide adequate cooling.
Troubleshooting for units that fail to heat or provide insufficient heating.
Troubleshooting for units that fail to stop heating operation.
Troubleshooting for units that do not initiate or complete defrost cycles.
Troubleshooting for abnormal high or low pressures during cooling.
Troubleshooting for abnormal noise or vibrations from the compressor or fans.
Troubleshooting for controller issues, including loss of control or wiring faults.
Troubleshooting for lack of or restricted airflow from the evaporator.
Troubleshooting for issues related to the thermostatic expansion valve.
Troubleshooting for autotransformer issues, such as unit not starting.
Troubleshooting for water-cooled condenser and water pressure switch faults.
Troubleshooting for compressor operating in reverse, warning about internal damage.
Troubleshooting for abnormal discharge or suction temperatures.
Troubleshooting for abnormal current readings from the unit.
Description of service valves, their function, and operation.
Use of manifold gauge set for system pressure, charging, and evacuation.
Procedure for pumping down the unit to service specific components.
Recommended procedures for finding refrigerant leaks in the system.
Procedures for evacuating and dehydrating the refrigeration system.
Procedures for checking and adding refrigerant charge to the system.
Information and procedures related to the RSH105 compressor.
Step-by-step instructions for removing and replacing the compressor.
Procedures for checking and adding compressor oil.
Procedures for replacing and checking the high pressure switch.
Step-by-step instructions for replacing the high pressure switch.
Procedure for testing the high pressure switch functionality.
Instructions for cleaning and replacing the condenser coil.
Procedures for servicing the condenser fan and motor assembly.
Information on checking and replacing the filter-drier.
Description and procedures for servicing evaporator and economizer expansion valves.
Procedure for checking superheat for the evaporator expansion valve.
Instructions for removing and installing expansion valves.
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