General Control Of Refrigerating Cycle - Kenmore 4666812 Service Manual

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I
V General Control of Befrigeratlng Cycle
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NO. ITEMS
UNIT
STANDARDS
PURPOSES
REMARKS
1 Pipe and
piping system
opening time
Min.
Pipe:wilhin t hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
To protect
moisture
penetralion.
The opening time should be reduced
lo a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).
2
Welding
Nitrogen
pressure
Weld under Nitrogen
atmosphere.
(Nz pressure:
0.1-0.2 kg/cm')
To protect oxide
scale formation.
Refer to repair nole in each part.
R-134a refrigerant is more
susceptible to leaks than R-l2 and
requires more care during welding.
Oo ndapplybrcetopripes
bebre and
after weHing lo protect plp€ ftorn oacking.
3 Nz sealed
parls
Confirm
Nz leak
Confirm air leaking sounds
when removing rubber cap,
Sound:,usable
No sound: not usable
To protecl
moisture
penetration.
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or Na gas for
more lhan 1 min and use the parts. '
4
Refrige
Edcrl
Cycle
Ev.din
tirne
\4ruun
degree
Min.
More lhan 40 minul€s
To remorc moigturc:
Torr Below 0.03 (ref)
Note: Onlu applicable to lhe model
equipped wilh revefse flow
protect plate.
Vacuum EA
High and low pressure sides
are evacuated at the same
time for models above 2(X) l.
Vacuum efficienry can be improved
by operating compressor during
evacualion.
\4ruun
pirng
EA Use R-'134a exclusiw
manifold.
To protect mixing
of mineral and
ester oils.
The rubber pipes for R-l2 refrigerant
shallbe melted when they are used for
R-l34a relrigerant (causes of leak).
Ppe
@tpler
EA Use R-134a exclusive. To protect R-'12
reldgerant mixing.
OirU€t
(se)
P[rg
R-134a exclusiw.
H-134a exclusive.
5
Relrigerant
weighing
EA
Use R-1 34a exclusively.
Weighing allowance: tSg
Note: Winter: -59 ,
Summer: +59
Do not mix with
R-12 refrigerant.
- Do not weigh the refrigerant at too
hol or too cold an area.
(77 " F125" Cl is adeq uate. )
- Make Copper bombe
Soc-ketl2SV Plug: 2PV R:134a
Note: Do nol burn O-ring (rubber)
during welding.
6
Drier
replacemenl
- Use R-134a exclusively for
R-134a refrigerator.
- Use R-l2 exelusively lor
R-12 refrigerator.
- @lace dderuhenever tepaiting
rettiprator clde p{irg.
To remove lhe
moisture from
pipe inside.
7
Leak check
- Do not use soapy water lor
check. lt may be sucked into
the pipe by vacuum.
Defect
refrigerant leak
area.
- Gheck oil leak at relrigeranl loak
area. Use elec-tronic leak detector if
oilleak is not found.
- The electronic leak detec'tor is very
sensiliro to halogen gas in the air. lt
also can detect R-141b in urethane.
Please practice, therelore, many
times belore use.
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