To Flush The System; To Use Dry Nitrogen To Flush The System; To Use Refrigerant To Flush The System - Frigidaire FKCH17F7HW Technical & Service Manual

To Flush The System

Use extreme care when using Dry Nitrogen to
flush systems. Pressure in nitrogen cylinder
could be as high as 2000 psi. Nitrogen cylinder
must be equipped with approved pressure
regulator and pressure relief valve. Ensure that
your hoses have adequate ratings for pressure
involved and that all of your equipment is in good
condition. The end of the flushing hose on this
tank regulator must be equipped with a hand
shut-off valve (Robinair No. 40380). Close hand
shut-off valve and adjust nitrogen regulator to
correct pressure before proceeding with flushing
procedure.

To Use Dry Nitrogen To Flush The System:

1. Remove compressor and filter-drier. Connect
process coupling to outlet tube of condenser.
2. Fasten cloth over other end of coil to prevent old oil
from spraying over room.
3. Connect hand shut-off valve on flushing hose to
process coupling.
4. Slowly open hand shut-off valve and allow nitrogen
to flow through condenser until discharge is clear.
DO NOT exceed 300 PSIG.
5. Disconnect cap tube from evaporator. Flush
evaporator in same manner as condenser.
DO NOT exceed 150 PSIG.
6. Flush cap tube. This is only possible if you have
proper service valve adapter.
DO NOT exceed 300 PSIG.
7. Reassemble system.
Refrigeration System

To Use Refrigerant To Flush The System:

Refrigerant used for flushing must be recovered
into a recovery system. Meter amount of
refrigerant used for flushing with your charging
cylinder. DO NOT OVERFILL THE BAG.
1. Disconnect the suction and discharge lines from the
compressor and remove the filter-drier. Connect
process coupling to outlet and inlet tube of
condenser.
2. Connect hose to outlet process coupling and
charging cylinder. Connect another hose to inlet
coupling and recovery system.
3. Open charging cylinder and allow refrigerant to flow
through condenser until discharge into bag is clear.
The line piercing valve (clamp-on type) should be
used for test purposes only. It must be removed
from system after it has served its purpose.
4. Disconnect capillary tube from evaporator. Flush
evaporator in same manner as condenser.
5. Flush cap tube. This is only possible if you have a
proper service valve adapter.
6. Reassemble system.
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