Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
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Leakage of outdoor PMV
Leakage of check valve in
discharge pipe convergent
section
A,
B
1)
With PMV1 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 (A) and check valve
of discharge pipe (
B
). Replace the
troubled
parts.
2)
If the pressure does not increase,
fully
open outdoor PMV 1 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 (
B
). Replace the part.
Leakage of check valve in
discharge pipe
C
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 (
C
). Replace
the part.
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
D
4
) 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.
A
D
C
B
(TD2)
(TE1)
(TK1)
(TD1)
(TO)
SV
SV
SV
(SV41)
SV
M
(TL1)
(TS3)
(TL3)
Reducer
(SV2)
(SV3D)
(SV42)
(PMV4)
(TS1)
Fan
Fan motor
Right side
Main heat exchanger
Left side
Main heat exchanger
(PMV1)
4-way valve
High-pressure
sensor
Low-pressure
sensor
Oil separator
Accumulator
High-
pressure
switch
High-
pressure
switch
Compressor
1
(Inverter)
Liquid side
Service valve
Gas side
Service valve
Sub cool
heat exchanger
SV
(SV52)
Reducer
Compressor
2
(Inverter)
SV
(SV51)
(TK2)
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