How to Check step by step Refrigerant Circuit Problems part 1

Refrigerant Circuit Problems

There is no or only little cool temperature to the air flow from the evaporator.

System Condition 1

1. Low pressure gauge reading is below normal. For normal operating pressures, refer to Table 1.

2. High pressure gauge reading is below normal. For normal operating pressures, refer to Table 1.

Note: Ambient temperature is above 21°C (70°F).

3. From the evaporator, the temperature of the air flow is partially cool.

Probable Cause

Leaks in the refrigerant circuit will cause the system to be low on refrigerant.

* Perform a leak test. refer to the Service Manual, SENR5664, "Refrigerant Leakage - Test" section in Testing and Adjusting.

* If leaks are found, recover the refrigerant. Refer to the Service Manual, SENR5664, "Refrigerant Recovery" section.

* Repair leaks.

* If a large amount of refrigerant was lost, it is important to check the compressor for loss of oil.

* Perform a partial charge of the system.

* Evacuate the system. Refer to the Service Manual, SENR5664, "Refrigerant System - Evacuate" section in Testing and Adjusting.

* Charge the system with the correct amount of refrigerant. Measure the refrigerant by weight. Refer to the Service Manual, SENR5664, "Refrigerant System - Charge" section in testing and adjusting.

* After the system is charged and operated for a minimum of ten minutes, perform a performance check. Refer to "Performance Checks for the Air Conditioning System" section.

System Condition 2

1. Low pressure gauge reading is normal. For normal operating pressures, refer to Table 1.

2. High pressure gauge reading bounces or the reading is unsteady.

Probable Cause

Air is in the system.

* Reclaim the refrigerant from the air conditioning system.

* Evacuate the air conditioning system.

* Recharge the air conditioning system.

System Condition 3

1. Low pressure gauge reading is below normal. For normal operating pressures, refer to Table 1.

2. High pressure gauge reading is above normal. For normal operating pressures, refer to Table 1.

Note: Ambient temperature is above 21°C (70°F).

3. The temperature of the air flow from the evaporator is warm.

Probable Cause

Air or moisture (water) in the system

* Recover the refrigerant. Refer to the Service Manual, SENR5664, "Refrigerant Recovery" section.

* Replace the receiver-dryer or the in-line dryer. The desiccant may be full of moisture. This will release water into the system. Refer to the Service Manual, SENR5664, "Receiver-Dryer - Remove and Install" section in Disassembly and Assembly. For in-line dryers, refer to the Service Manual, SENR5664, "In-Line Refrigerant Dryer - Remove and Install" section in Disassembly and Assembly.

* Evacuate the system. Refer to the Service Manual, SENR5664, "Refrigerant System - Evacuate" section in Testing and Adjusting.

* Charge the system with the correct amount of refrigerant. Measure the refrigerant by weight. Refer to the Service Manual, SENR5664, "Refrigerant System - Charge" section in Testing and Adjusting.

* After the system is charged and operated for a minimum of ten minutes, perform a performance check. Refer to "Performance Checks for the Air Conditioning System" section.