Refrigerant Circuit Problems
System Condition 12
* Water is in the vents.
* Water is leaking from the unit.
Probable Cause
* The non-return valve of the drain
1. Check the non-return valve for proper positioning and proper direction.
The Compressor will not Engage
If the machine is equipped with the protection system for the refrigerant compressor, Refer to the Service Manual, SENR 5664, "Troubleshooting Heating and Air Conditioning Control Systems" in order to test the on delay timer assembly for the refrigerant compressor.
System Condition 13
1. Low pressure gauge reading is above normal.
2. High pressure gauge reading is below normal.
Note: Ambient temperature is above 21°C (70°F).
3. Air flow to the operator's compartment is warm.
Probable Cause
1. The thermostatic switch is stuck open. This does not allow the magnetic clutch to cycle the compressor.
1. Check the wire connectors on the thermostatic switch and on the magnetic clutch.
2. The connection of wire leads on switch is improper. The connection of wire leads on the magnetic clutch is improper.
1. Check for insulation that is broken. The insulation failure can expose the wires from the switch to the magnetic clutch.
3. The wire that connects the switch to the magnetic clutch has an opening.
1. Check the resistance of the coil with a multimeter. Refer to the Service Manual, SENR5664, "Refrigerant Compressor" section in Specifications.
2. Check for the proper electrical ground at the magnetic clutch.
3. Touch the two wires on the switch together. Check for the proper operation of the magnetic clutch.
4. In order to check the electrical components, refer to Service Manual, SENR5664, "Troubleshooting Heating and Air Conditioning Control System" in Testing and Adjusting.
If the problem is a loose wire on the switch or a loose wire on the magnetic clutch, make the repairs that are needed. If the wires to the clutch were damaged, the damaged wires can cause the switch to remain open. Make the needed repairs to the damaged wires. In order to ensure the correct system operation, perform a performance check.
4. The charge of refrigerant in the capillary tube has been lost.
1. If the capillary tube has no charge or the switch remains open, the problem is in the thermostatic switch.
* Replace the switch.
* In order to ensure the correct system operation, perform a performance check. Refer to "Performance Checks for the Air Conditioning System" section.
The Compressor Continues to Cycle or the Clutch will not Disengage.
Note: The cause of the problem may be one of the following conditions: low charge, overcharge and evaporator freeze-up .
System Condition 12
* Water is in the vents.
* Water is leaking from the unit.
Probable Cause
* The non-return valve of the drain
1. Check the non-return valve for proper positioning and proper direction.
The Compressor will not Engage
If the machine is equipped with the protection system for the refrigerant compressor, Refer to the Service Manual, SENR 5664, "Troubleshooting Heating and Air Conditioning Control Systems" in order to test the on delay timer assembly for the refrigerant compressor.
System Condition 13
1. Low pressure gauge reading is above normal.
2. High pressure gauge reading is below normal.
Note: Ambient temperature is above 21°C (70°F).
3. Air flow to the operator's compartment is warm.
Probable Cause
1. The thermostatic switch is stuck open. This does not allow the magnetic clutch to cycle the compressor.
1. Check the wire connectors on the thermostatic switch and on the magnetic clutch.
2. The connection of wire leads on switch is improper. The connection of wire leads on the magnetic clutch is improper.
1. Check for insulation that is broken. The insulation failure can expose the wires from the switch to the magnetic clutch.
3. The wire that connects the switch to the magnetic clutch has an opening.
1. Check the resistance of the coil with a multimeter. Refer to the Service Manual, SENR5664, "Refrigerant Compressor" section in Specifications.
2. Check for the proper electrical ground at the magnetic clutch.
3. Touch the two wires on the switch together. Check for the proper operation of the magnetic clutch.
4. In order to check the electrical components, refer to Service Manual, SENR5664, "Troubleshooting Heating and Air Conditioning Control System" in Testing and Adjusting.
If the problem is a loose wire on the switch or a loose wire on the magnetic clutch, make the repairs that are needed. If the wires to the clutch were damaged, the damaged wires can cause the switch to remain open. Make the needed repairs to the damaged wires. In order to ensure the correct system operation, perform a performance check.
4. The charge of refrigerant in the capillary tube has been lost.
1. If the capillary tube has no charge or the switch remains open, the problem is in the thermostatic switch.
* Replace the switch.
* In order to ensure the correct system operation, perform a performance check. Refer to "Performance Checks for the Air Conditioning System" section.
The Compressor Continues to Cycle or the Clutch will not Disengage.
Note: The cause of the problem may be one of the following conditions: low charge, overcharge and evaporator freeze-up .
