Evacuation And Charging Procedure - Electrolux Built-in 42" Service Manual

Evacuation and Charging Procedure

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
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.
Evacuating System
WARNING: R-134A SYSTEMS ARE
PARTICULARLY
MOISTURE CONTAMINATION WHICH CAN
ONLY BE PREVENTED BY EVACUATING THE
SYSTEM FOR A MINIMUM OF 30 MINUTES
TO ATTAIN A MINIMUM 29.9 INCH (500
MICRON OR LOWER) VACUUM.
To achieve the required levels of evacuation, a
properly maintained two stage vacuum pump in good
condition is required. It is absolutely essential to maintain
your vacuum pump according to the manufacturer's
instructions including required oil changes at the
mended intervals. Vacuum pump oil should
changed after evacuating a contaminated system.
Vacuum pump performance should be checked
periodically with a micron gauge.
1. Make certain that charging cylinder valve, hand
shut-off valve, and manifold gauge valves are
closed.
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SUSCEPTIBLE TO
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always be
2. Start vacuum pump.
3. Open hand shut-off valve and slowly open both
manifold valves, turning counterclockwise, for
two full rotations.
CAUTION: If high vacuum equipment is
used, just crack both manifold valves for a
few minutes and then open slowly for the
two full turns counterclockwise. This will
prevent the compressor oil from foaming
and being drawn into the vacuum pump.
4. Operate the vacuum pump for a minimum of 30
minutes to a minimum of 29.9" (500 micron)
vacuum.
5. Close hand shut-off valve to vacuum pump.
Watch compound gauge for several minutes. If
reading rises, there is a leak in the system, go to
step 6. If no leak is indicated, stop vacuum pump.
System is now ready for charging.
6. If a leak is indicated, stop vacuum pump and
introduce a small charge of refrigerant into
system by cracking valve on bottom of charging
cylinder until system is pressurized to 40 or 50 l
bs psig.
7. Leak test low-side. Close compound gauge.
Run compressor for a few minutes and leak test
high-side. When leak is found, recapture refrig
erant using EPA approved recovery system
Repair and go back to step 1.
Charging The System
CAUTION: Check the serial plate for the cor-
rect refrigerant type. It is extremely important
to verify the type of refrigerant in the system
before starting any sealed system repairs.
CAUTION: After charging the system with
liquid be certain to wait at least 5 minutes
before starting the compressor to give the
refrigerant a chance to disperse throughout
the system. Otherwise the compressor could
be damaged by attempting to pump exces-
sive quantities of liquid.
Preparing The Charging Cylinder:
1. Make certain that hand shut-off valve to vacuum
pump is closed.
2. Close high-side manifold gauge valve.
3. Set charging cylinder scale to pressure indicated
on cylinder pressure gauge.
4. Observe refrigerant level in sight glass. Subtract
amount to be charged into system and note shut
off point.
5. Open charging cylinder valve slowly and allow
proper charge to enter system.
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