Electrolux R134A, Service Manual

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SWEEP AND FINAL CHARGE SWEEP AND FINAL CHARGE
SWEEP AND FINAL CHARGE SWEEP AND FINAL CHARGE
SWEEP AND FINAL CHARGE
T O T O T O T O T O
C H A R G I N G C H A R G I N G C H A R G I N G C H A R G I N G C H A R G I N G
C Y L I N D E R C Y L I N D E R
C Y L I N D E R C Y L I N D E R C Y L I N D E R
T O T O T O T O T O
R E C O V E R Y R E C O V E R Y
R E C O V E R Y R E C O V E R Y
R E C O V E R Y
S Y S T E M S Y S T E M
S Y S T E M S Y S T E M S Y S T E M
BBBBB CCCCC
ACCESS V ACCESS V
ACCESS V ACCESS V
ACCESS VAL AL
AL AL
ALVE VE
VE VE
VE
AAAAA
The sweep charge is a method of purging
the sealed system of moisture, air and po-
tential contaminants. Also during this pro-
cedure, the system may be checked for
leaks before the final charge. If this proce-
dure is followed as outlined, it will allow for
the capture of 90-95 percent of the available
refrigerant, thereby ensuring that the sys-
tem will operate as designed.
The sweep procedure for R134a refrigerant
systems is made after the system has been
repaired and/or flushed. Three (3) ounces
of refrigerant R134a is added to the system,
circulated by the compressor for 5 minutes
and recovered. Since a new drier - part
#13900-1 #13900-1
#13900-1 #13900-1 #13900-1 has already been installed, a high
side process tube is available. Install a tem-
porary access valve to this process tube
close enough to the end of the tube so that
the tube can be pinched closed behind the
valve and the opening sealed shut after the
valve is removed. Remember, no access
valve is to be left on the sealed system. Con-
nect a 1/4 inch flare tee to the access valve.
Connect a quick coupler hand valve to each
side of the tee. To one hand valve, connect
the hose from the charging cylinder. To the
other valve, connect the hose to the recov-
ery system.
The following steps take you through the
sweep and final charge.
•Step 2 •Step 2 •Step 2 •Step 2 •Step 2. With liquid refrigerant present to valve A, valve B closed and valve C open
(C will remain open throughout sweep procedure), open valve A to allow three (3)
ounces of refrigerant into the system. Close valve A. Check low side for leaks. After
system has equalized (about 3 to 5 minutes), start system compressor, check for high
side leaks and allow refrigerant to circulate in the system about 5 minutes.
•Step 1. •Step 1.
•Step 1. •Step 1. •Step 1. Set up of valves: temporary access valve (C) piercing drier process tube,
connected to flare tee, hand valve (A) to charging cylinder, hand valve (B) to recovery
system.
BBBBB AAAAA CCCCC
ACCESS V ACCESS V
ACCESS V ACCESS V ACCESS VAL
AL
AL AL ALVE
VE
VE VE VE
T O T O
T O T O
T O
R E C O V E R Y R E C O V E R Y
R E C O V E R Y R E C O V E R Y R E C O V E R Y
S Y S T E M S Y S T E M S Y S T E M S Y S T E M S Y S T E M
T O T O
T O T O T O
C H A R G I N G C H A R G I N G C H A R G I N G C H A R G I N G C H A R G I N G
C Y L I N D E R C Y L I N D E R
C Y L I N D E R C Y L I N D E R C Y L I N D E R