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17
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.
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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.
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.
IMPORTANT: The compressor should never be
operated without refrigerant!
IN-LINE
FILTER DRIER
COMPRESSOR
IN-LINE
FILTER DRIER
COMPRESSOR
FIGURE 32 — STRAINER AND
CAPILLARY TUBE LOCATION
FIGURE 33A — IN-LINE FILTER DRIER —
GENERAL INSTALLATION LOCATION
FOR HEAT/COOL UNIT
FIGURE 33B — IN-LINE FILTER DRIER —
GENERAL INSTALLATION LOCATION
FOR HEAT PUMP UNIT