Evacuating System; Charging The System; Preparing The Charging Cylinder - Electrolux FPRH17D7KF All Refrigerator Professional Series Servicing

WARNING
R-134a systems are particularly susceptible to
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.

Evacuating System

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 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 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 lbs psi.
Section 4 Refrigeration
7. Leak test low-side. Close compound gauge. Run
compressor for a 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. 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 excessive
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.
WARNING
Disconnect the charging cylinder heater at this
time to prevent the cylinder pressure from
exceeding its maximum limits.
7. Allow system to sit for five minutes.
8. Turn on refrigerator compressor. Run compressor for
a few minutes and monitor system pressures.
9. When satisfied that the unit is operating correctly,
clamp the high-side process tube with the pinch-off
tool while the unit is still running.
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