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• General Control of Refrigerating Cycle
NO
1
5
6
7
_EMS
Pipe and
piping system
opening time
Welding
N2sealed
parts
ra_0n
Cycle
E-_ac.a_m
time
Vacuum
degree
UNIT
Min.
STANDARDS
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Nitrogen Weld under Nitrogen
pressure atmosphere.
(N2 pressure:
0.1-0.2 kg/em _)
Confirm Confirm air leaking sounds
N2 leak when removing rubber cap.
Sound: usable
No sound: net usable
Min. More than 40 minutes
PURPOSES
To protect
moisture
_enetration.
To protect oxide
scale formation.
To protect
moisture
penetration.
TO remove rrloisturs,
REMARKS
The opening time should be reduced
to a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).
- Refer to repair note in each part.
- R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding,
- Do notapplyforce to pipesbeforeand
a_er weldingto protectpipe from cradling,
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap. blow dry air or N2gas for
more than 1 min and use the parts.
Torr Below 0.03 (ref) Note: Only applicable to the model
equipped with reverse flow
protect plate.
Vacuum EA High and low pressure sides Vacuum efficiency san be improved
are evacuated at the same by operating compressor during
time for models above 200 l. evacuation.
Vacuum EA Use R-134a exoiusive To protect mixing The rubber pipes for R-12 refdgerant
piping manifold, of mineral and shall be melted when they are used for
ester oils. R-134a refrigerant (causes of leak.)
Pipe EA Use R-134a exclusive. To protect R-12
ccup_er refrigerant mixing.
Outlet R-134e exclusive.
(sed_t)
P_g
Refrigerant
weighing
EA
Drier
replacement
Leak check
R-134a exclusive.
Use R-134a exclusively.
Weighing allowance: +5g
Note: Winter: -5g
Summer: +Sg
- Usa R-t34a exclusively for
R-134a refrigerator.
- Use R-12 exclusively for
R-12 refrigerator.
- Replacedder whenever repairing
ref_a-atrxcydepip.g,
- Do not use soapy water for
check. It may be sucked into
the pipe by vacuum.
Do net mix with
R-12 refrigerant.
To remove the
moisture from
pipe inside,
-15-
Defect
refrigerant leak
area.
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F[25°C] is adequate,)
-MakeCop_b_be(0e,iceill,re_gE_a_)
Socket: 2SV Plug: 2PV R-134a
Note; Do not burn O-ring (bushing)
during welding.
- Check oil leak at refrigerant leak
area. Use electronic leak detector if
oil leak is not found.
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Practice many times before using
this type of detector.
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