261
<MMY-MAP1404
#
and MAP1604
#
>
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
A,B
C,D
1) With PMV1, 2 and 4 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, 2 or 4 (A, B) and either
discharge pipe check valve (C, D). 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 (D). Replace the part.
With just PMV4 fully opened, 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.
Leakage of check valve in
discharge pipe
E
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.
Leakage of check valve in oil
equalization circuit
F
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.
Leakage of SV3A valve
G
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.
Leakage of SV3B valve
H
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.
Clogging of SV3E valve
Clogging of oil-return distributor
I
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.
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
J
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.
A
B
G
J
I
E
H
D
C
F
(TL)
PMV1
4-way valve
High-pressure sensor
(TD2)
(TS1)
(SV2)
(TE1)
M
(SV3D)
PMV2
(TK2)
(SV3B)
(TK1)
(SV3A)
(TD1)
(TK4)
(SV3E)
(TK5)
(SV41)
(SV42)
PMV4
Fan
Liquid tank
(TE2)
Left-side sub-heat exchanger
(TD3)
(SV43)
(TK3)
(SV6)
(TO)
(SV3F)
(SV3C)
SV
SV
SV
SV
SV
SV
S
V
S
V
SV
SV
S
V
Right-side
Main heat exchanger
Left-side
Main heat exchanger
Right-side sub-heat exchanger
Fan motor
Check valve (sub-
heat exchangers)
Check valve
(main heat
exchangers)
Discharge pipe check joint
Fusible
plug
Oil separator
Oil-return capillary
High-
pressure
SW
High-
pressure
SW
High-
pressure
SW
Compressor
1
(Inverter)
Low-pressure sensor
Accumulator
Compressor
3
(Inverter)
Check valve
Check valve
Oil pipe
Liquid pipe check
joint
Oil-return distributor
Liquid-side
service valve
Gas-side
service valve
Balance pipe
packed valve
