Table of Contents
Advertisement
• 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 size
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 size process tube 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: R134A SYSTEMS ARE PARTI-
CULARLY SUSCEPTIBLE TO MOISTURE
CONTAMINATION WHICH CAN ONLY BE
PREVENTED BY EVACUATING THE SYS-
TEM 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
recommended intervals. Vacuum pump oil should always
be 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.
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, 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 minimum of 30 minutes
to attain 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 leak in system, go to step 6. If no leak
is indicated, stop vacuum pump. System is now
ready for charging.
6. If leak is indicated, stop vacuum pump and
introduce small charge of refrigerant into system by
cracking valve on bottom of charging cylinder until
system is pressurized to 40 or 50 lbs, psig.
7. Leak test low-side. Close compound gauge.
Run compressor for few minutes and leak test high-
side. When leak is found, recapture refrigerant using
EPA approved recovery system, repair and go back
to step 1.
Charging The System
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.
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.
6. As soon as refrigerant in sight glass has gone down
to predetermined level, close charging cylinder valve.
45
Advertisement
Table of Contents
