Flushing System With Nitrogen; Installing New Compressor - Frigidaire FFBN1721TV0 Technical & Service Manual

Service Manual - Four-door Refrigerator ( FFBN1721TV0 )
Sealed System

Flushing System with Nitrogen

It is recommended that system be flushed with dry nitrogen.
However, if refrigerant is used to flush the system you must look
at the serial plate to see what type of refrigerant is used in the
system. This is the only refrigerant that can be used to flush the
system and it must be recovered.
If dry nitrogen or carbon dioxide is not available. Follow instruc-
tions 1 through 3, then use 4 and 5 listed below as an alternative
method.
1. Connect gauges to charging hose fittings. Pull a vacuum on
each side of the system.
2. Leave the vacuum on each side of the system for 24 hours.
Any loss of vacuum is an indication of a leak.
USE EXTREME CARE WHEN USING DRY
NITROGEN
PRESSURE IN NITROGEN CYLINDER
COULD BE AS HIGH AS 2000 PSI.
NITROGEN
EQUIPPED WITH APPROVED PRESSURE
REGULATOR AND PRESSURE RELIEF
VALVE. ENSURE THAT YOUR HOSES
HAVE
PRESSURE INVOLVED AND THAT ALL OF
YOUR EQUIPMENT IS IN GOOD CONDI-
TION. WHEN FLUSHING WITH NITROGEN
THERE
REGULATOR ON THE TANK WITH THE
MAXIMUM PRESSURE ON THE LOW-
SIDE OF THE SEALED SYSTEM (EVAPO-
CAUTION
RATOR) AT 150 PSI AND AT THE HIGH
SIDE, 300
FLUSHING
REGULATOR MUST BE EQUIPPED WITH
A HAND SHUT-OFF VALVE (ROBINAIR NO.
40380). CLOSE HAND SHUT-OFF VALVE
AND ADJUST NITROGEN REGULATOR TO
CORRECT
PROCEEDING WITH FLUSHING
PROCEDURE.
3. Remove compressor and filter-drier. Connect process
coupling to outlet tube of condenser.
4. Fasten cloth over other end of coil to prevent old oil from
spraying over room.
5. Connect hand shut-off valve on flushing hose to process
coupling.
Page 28
TO FLUSH SYSTEMS.
CYLINDER MUST
ADEQUATE RATINGS
MUST BE A PRESSURE
PSI. THE END OF
HOSE ON THIS
PRESSURE BEFORE
6. Slowly open hand shut-off valve and allow nitrogen to flow
through condenser until discharge is clear.
CAUTION
7. Disconnect cap tube from evaporator. Flush evaporator in
same manner as condenser.
CAUTION
8. Flush cap tube. This is only possible if you have a proper
BE
service valve adapter.
FOR
CAUTION
9. Reassemble system.

Installing New Compressor

THE
TANK
Replacement of compressor and installation of filter-drier must
be done in a continuous sequence so the system is exposed to
atmosphere no longer than necessary. All replacement compres-
sors are shipped with rubber plugs in the suction, discharge and
process tubes, and contain the correct oil charge and a holding
charge of inert gas. Compressors have a low-side process tube
attached to the compressor shell. A high-side process tube is
attached to the filter-drier. Replacement compressors for refriger-
ators may have an oil cooler even if the original compressor did
not. If the product is not equipped for an oil cooler, leave the
plastic caps in place and install the compressor, connecting only
to the suction and discharge lines of the new compressor.
DO NOT EXCEED 300 PSI.
DO NOT EXCEED 150 PSI.
DO NOT EXCEED 300 PSI.