7
16021730 Rev. 0
Every time sealed HFC134a system is repaired, drier
filter must be replaced.
Cut drier out of system by completing the following
steps. Do not unbraze drier filter. Applying heat to
remove drier will drive moisture into system.
1. Score capillary tube close to drier and break.
2. Reform inlet tube to drier allowing enough space
for large tube cutter.
3. Cut circumference of drier at 1-1/4", below
condenser inlet tube joint to drier.
4. Remove drier.
5. Apply heat trap paste on post condenser tubes to
protect grommets from high heat.
6. Unbraze remaining part of drier. Remove drier
from system.
7. Discard drier in safe place. Do not leave drier with
customer. If refrigerator is under warranty, old
drier must accompany warranty claim.
Refrigerant Precautions
WARNING
!
To avoid risk of personal injury, do not allow
refrigerant to contact eyes or skin.
CAUTION
!
To avoid risk of property damage, do not use
refrigerant other than that shown on unit serial
number identification plate.
NOTE
: All precautionary measures recommended by
refrigerant manufacturers and suppliers apply
and should be observed.
Line Piercing Valves
Line piercing valves can be used for diagnosis, but are
not suitable for evacuating or charging due to holes
pierced in tubing by valves.
NOTE
: Do not leave line piercing valves on system.
Connection between valve and tubing is not
hermetically sealed. Leaks will occur.
Service Procedures
Service Equipment
Listed below is equipment needed for proper servicing
of HFC134a systems. Verify equipment is confirmed
by manufacturer as being compatible with HFC134a
and ester oil system.
Equipment must be exclusively used for HFC134a.
Exclusive use of equipment only applies to italic items.
Evacuation pump
Check with vacuum pump supplier to verify equipment
is compatible for HFC134a. Robinair, Model 15600
2 stage, 6 cubic feet per minute pump is
recommended.
Four-way manifold gauge set, with low loss hoses
Leak detector
Charging cylinder
Line piercing saddle valve
(Schroeder valves). Seals must be HFC134a and
ester oil compatible. Line piercing valves may be used
for diagnosis but are not suitable for evacuation or
charging, due to minute holes pierced in tubing. Do
not leave mechanical access valves on system.
Valves eventually will leak. Molecules of HFC134a are
smaller than other refrigerants and will leak where
other refrigerants would not.
Swagging tools
Flaring tools
Tubing cutter
Flux
Sil-Fos
Silver solder
Oil for swagging and flaring
Use only part # R0157532
Copper tubing
Use only part # R0174075 and # R0174076
Dry nitrogen
99.5% minimum purity, with -40°F or lower dew point
Crimp tool
Tube bender
Micron vacuum gauge
Process tube adaptor kit
Heat trap paste
ICI appliance grade HFC134a
Drier Replacement
Before opening refrigeration system, recover HFC134a
refrigerant for safe disposal.
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a 10,000 ohm resistor before attempting
to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational.
!
WARNING
