MULTI TYPE

Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
Check item Location Procedure
Leakage of outdoor PMV
Leakage of check valve in
discharge pipe convergent
section
Leakage of check valve in
discharge pipe
Leakage of check valve in oil
equalization circuit
Leakage of SV3A valve
Leakage of SV3B valve
Clogging of SV3E valve
Clogging of oil-return distributor
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
A,C
E
F
G
H
I
J
1) With PMV1 and 2 fully closed, apply pressure to the check joint of liquid pipe with nitrogen, and check the
pressure at the check joint of discharge pipe.
If the pressure at the check joint of discharge pipe increases, there is a leak from PMV1 or 2 (A) and check valve
of discharge pipe (C). Replace the faulty parts.
2) If the pressure does not increase, fully open outdoor PMV 1 and 2 and check the pressure at the check joint of
discharge pipe again.
If the pressure increases, there is a leak from the check valve of discharge pipe (C). Replace the part.
3) With pressure applied to the check joint of discharge pipe with nitrogen, if gas escapes from the discharge pipe
section of the disconnected compressor, there is a leak from the check valve of discharge pipe (E). Replace the
part.
4) With pressure applied to the check joint of discharge pipe with nitrogen, if gas escapes from the oil equalization
pipe section of the disconnected compressor, there is a leak from the oil equalization pipe check valve (F).
Replace the part.
5) With pressure applied to the check joint of discharge pipe with nitrogen, manually open the SV3B valve. If gas
escapes from the suction pipe section of the disconnected compressor, there is a leak from the SV3A valve.
Replace the part.
6) Then manually open the SV3A valve. If gas escapes from the suction pipe section of the disconnected
compressor, there is a leak from the SV3B valve. Replace the part.
7) With pressure applied to the check joint of discharge pipe with nitrogen, manually open the SV3E valve. If gas
does not escape from the suction pipe section of the disconnected compressor, the SV3E valve or oil-return
distributor is clogged. Replace the part.
8) With pressure applied to the check joint of discharge pipe with nitrogen, manually open the SV3D valve. If gas
does not escape from the suction pipe section of the disconnected compressor, the SV3D valve, oil-return
capillary or oil-return distributor is clogged. Replace the part.
M
Right-side
Fan motor
Fan
Main heat exchanger
(TO)
Left-side
(TE1)
Main heat exchanger
SV
(SV5)
Reducer
A
PMV1
PMV2
4-way valve
(TS1)
C
Check valve
J
(TL)
High-pressure sensor
Discharge pipe check joint
SV
Low-pressure sensor
E
Fusible
plug
(SV3D)
SV
SV
Oil separator
(SV41)
Oil-return
capillary
(SV2)
Check valve
SV (SV42)
F
Liquid tank
(TD1)
High-pressure
SW
(SV3C
High-pressure
SW
(TD2)
Accumulator
Compressor A3
1
(Inverter)
SV
(TK4)
I
Check valve
(TK1)
(SV3E) (TK5 )
SV
Check valve
(TK2)
Oil pipe
Oil-return
distributor
H
Liquid pipe check
joint
G
(SV3A)
Check valve
SV
SV
(SV3B)
Check valve
Liquid-side
service valve
Gas-side
service valve
Balance pipe
packed valve
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