Table of Contents
Advertisement
10. Install new evaporator with attached suction
line.
11. Seal cabinet.
12. Install new filter drier at condenser outlet.
13. Evacuate and charge the system using
recommended procedure described under
Evacuating and Recharging.
Evacuating and Recharging
CAUTION
Check the serial plate for the correct
refrigerant type. It is extremely important to
verify the type of refrigerant in the system
before starting any sealed system repairs.
With the possible exception of the vacuum
pump, all service equipment that comes in
contact with R-134a during evacuation and
recharging must be dedicated. Accordingly,
R-134a will require a dedicated charging
cylinder, manifold gauge set, process tube
adaptors, and hoses. Any residual mineral
oil on other tools (tubing cutter, etc.) must
be thoroughly cleaned off before using
on R-134a/Ester oil systems. It will be
necessary to check with the manufacturer
of your vacuum pump for refrigerant and oil
compatibility issues.
If you use a vacuum pump with mineral
oil to evacuate an R-134a system, it is
ABSOLUTELY ESSENTIAL to have a shut-off
valve between the pump and your manifold
gauge set as shown on page Figure E2. The
hand valve must be closed during all times
when the vacuum pump is not operating. This
will prevent the migration of mineral oil vapor
into the R134a/Ester oil system. If the vacuum
pump should stop during evacuation for any
reason, the hand pump shut-off valve must be
closed immediately.
Insure that your refrigeration hoses are
specified for use with R-134a refrigerant.
Research has shown that compounds in
standard refrigeration hoses may enter
sealed systems and ultimately restrict the cap
tube in an R-134a system.
D - Refrigeration System
Equipment Needed for Evacuation &
Recharging:
•
Heated charging cylinder
•
Standard 3-port manifold gauge set:
- 4 charging hoses
- Tee fitting with valve core stem removed
(Robinair No. 40396)
- Hand shut-off valve (Robinair No.40380)
•
Two stage vacuum pump
•
Process tube adapter kit (Robinair No.
12458)
•
Tubing cutter
•
Pinch-off tool capable of making leak proof
seal
•
Complete brazing torch set
•
Small 3-corner file
•
Grit cloth or Scotch-Brite
•
45% silver solder and flux
•
Heat Gun
Installing Evacuation and Recharging
Equipment
1.
Disconnect refrigerator from electrical supply.
2.
If compressor was replaced, install correct
sized process tube adaptor on process tube.
If compressor was not replaced, cut process
tube with tubing cutter leaving as much tube
as possible and install correct size process
tube adaptor.
3.
Install correct sized process tube adaptor on
high-side process tube.
4.
Attach refrigeration service gauge manifold
to system in following order:
• Low-side (compound gauge) hose to suction
side process tube adaptor.
• High-side (pressure gauge) hose to high-side
process tube adaptor.
• Center port manifold hose before hand shut-
off valve to charging cylinder.
• Center port manifold hose after hand shut-off
valve to vacuum pump.
27
Hide quick links:
Advertisement
Table of Contents
