Electrolux R134A, Руководство по обслуживанию

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striction and the capillary tube and by frost-
covered tubing between the restriction and
the suction line. The restriction acts like a
second capillary tube, increasing the pres-
sure ahead of it (warming) and decreasing
the pressure beyond it (cooling). To con-
firm the existence of a restriction in the low
side tubing, perform operational pressure
checks.
(3) - Slow Leak In System (3) - Slow Leak In System
(3) - Slow Leak In System (3) - Slow Leak In System (3) - Slow Leak In System
On forced air models, long run time will be
noticed during the early stages of a leak. As
the refrigerant continues to escape, both
compartments will gradually warm up and
the compressor will run continuously. The
freezer will probably warm up first.
4) - Incorrect Refrigerant Charge 4) - Incorrect Refrigerant Charge
4) - Incorrect Refrigerant Charge 4) - Incorrect Refrigerant Charge
4) - Incorrect Refrigerant Charge
The sealed unit may have too much refrig-
erant (overcharged system) or too little re-
frigerant (undercharged system). The para-
graphs below will inform you on how to
recognize a system with these defects.
An overcharged system may have a frost
back condition appearing on the suction
line. When the compressor stops, the frost
melts and drips on the floor. A heat ex-
changer separation will also cause this
s y m p t o m .
An undercharged system, depending on the
degree of undercharge, will operate with
temperatures above normal and the com-
pressor run time will be increased. The
greater the undercharge, the higher the tem-
perature will be and the longer the run time.
An undercharged system must be purged,
evacuated, and recharged with the proper
amount of refrigerant. Before recharging,
test for refrigerant leaks.
TOOLS NEEDED FOR R134A TOOLS NEEDED FOR R134A
TOOLS NEEDED FOR R134A TOOLS NEEDED FOR R134A TOOLS NEEDED FOR R134A
SEALED SYSTEM REP SEALED SYSTEM REP
SEALED SYSTEM REP SEALED SYSTEM REP
SEALED SYSTEM REPAIR AIR
AIR AIR
AIR
The following list may help identify basic
refrigeration tools needed:
• ALL HOSES AND EQUIPMENT MUST
MEET STANDARDS FOR HANDLING R134A RE-
FRIGERANTS
• APPROVED AND CERTIFIED RECOVERY EQUIP-
MENT AND RECOVERY CYLINDER (see local sup-
plier for variety of equipment)
• MANIFOLD GAUGE SET / HOSES MUST HAVE
LOW LOSS FITTINGS
(Robinair 41365)
• HEATED CHARGING CYLINDER WITH R134A
SCALE (Robinair 43134B)
• TEMPORARY ACCESS VALVES (2)
(Robinair 40288)
• 1/4" FLARE TEE - MFL X MFL X FFL
(Robinair 40399)
• 1/4" QUICK COUPLER VALVE
(Robinair 40380)
• PROCESS TUBE ADAPTER SET
(Robinair 12458)
Other tools required, but not necessarily Other tools required, but not necessarily Other tools required, but not necessarily Other tools required, but not necessarily Other tools required, but not necessarily
dedicated to R134A Service: dedicated to R134A Service:
dedicated to R134A Service: dedicated to R134A Service: dedicated to R134A Service:
• TUBING CUTTER
(Robinair 14987A)
• BRAZING TORCH
(Robinair 12587)
• SWAGGING TOOLS
(Robinair 14313)
• VOLT-WATT METER (MAYTAG CUSTOMER
SERVICE 20000019)
• LEAK DETECTION EQUIPMENT FOR CFC/HCFC
AND HFC OR EQUIVALENT
• PINCH-OFF TOOLS
(Robinair 12294 or 12396)