Carrier 50GX, 50GS instruction manual Troubleshooting, Start-Upchecklist

System under pressure. Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death. Use all service ports and open all flow-control devices, including solenoid valves.

If oil is detected or if low cooling performance is suspected, leak-test all refrigerant tubing using an electronic leak-detector, halide torch, or liquid-soap solution. If a refrigerant leak is detected, refer to Check for Refrigerant Leaks section.

If no refrigerant leaks are found and low cooling performance is suspected, refer to Checking and Adjusting Refrigerant Charge section.

EVAPORATOR AIRFLOW

The heating and/or cooling air-flow does not require checking unless improper performance is suspected. If a problem exists, be sure that all supply- and return-air grilles are open and free from

obstructions, and that the air filter is clean. When necessary, refer to Indoor Airflow and Airflow Adjustments section to check the system airflow.

METERING DEVICE — ACUTROL DEVICE

This metering device is a fixed orifice and is located in the header to the evaporator coil.

LIQUID LINE STRAINER

The liquid line strainer (to protect metering device) is made of wire mesh and located in the liquid line on the inlet side of the metering device.

TROUBLESHOOTING

Use the Troubleshooting–Coolingguide (see Table 10) if problems occur with these units.

START-UP CHECKLIST

Use the Start-Up checklist to ensure proper start-up procedures are followed.

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