12.Install the new compressor and the new capillary assembly (the correct capillary and strainer may be obtained from Carrier RCD), into the unit.

13.Leak check the unit with 150 psi of nitrogen pressure.

14.For 52C,P units, the system should be evacuated from the high side to the low side to a minimum of 200 microns of mercury. This evacuation removes residual moisture from the system prior to charging.

15.For Heat Pump Units: Recharge unit to the nameplate refrigerant charge using a charging cylinder.

16.Pinch off each access valve on the process tubes, in 2 places, using a pinch off tool such as Imperial tool #105-FF or Robinair Tool #12294. Release any refrigerant pressure trapped in the access valve by depressing the valve core, then confirm that no R-22 is leaking past the pinch off tool location. Cut the access valve stem of the process tube above the top crimp and braze the top of each process tube to ensure the system is sealed, (leave the pinch off tool in place until after the brazing pro- cess is complete).

17.Reassemble the unit by reversing steps 1-9.

18.Connect the compressor wires and energize the unit to verify operation.

REFRIGERANT CHARGING — Every mechanical refrigeration system that is opened for servicing must be accurately charged before it is returned to service. Run the compressor ONLY after charging the system with refrigerant.

IMPORTANT: The compressor should never be operated without refrigerant!

It is important to remember that recovered and/or recycled refrigerant may only be recharged into the system from which it was initially recovered, or another one owned by the same customer. Charge level is important. Charge units only as recommended by manufacturer.

FIGURE 32 — STRAINER AND

CAPILLARY TUBE LOCATION

IN-LINE

FILTER DRIER

COMPRESSOR

FIGURE 33A — IN-LINE FILTER DRIER — GENERAL INSTALLATION LOCATION FOR HEAT/COOL UNIT

IN-LINE

FILTER DRIER

COMPRESSOR

FIGURE 33B — IN-LINE FILTER DRIER — GENERAL INSTALLATION LOCATION FOR HEAT PUMP UNIT

17

Page 17
Image 17
Carrier 52C, P manual Strainer Capillary Tube Location