Toshiba MMY-MAP0804HT8JP Service Manual page 261

<MMY-MAP0804 , MAP1004 and MAP1204 >
Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
C h e c k i e t m
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
PMV1
A
J
I
G
Liquid-side
service valve
L o c t a o i n
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
A,C 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
E 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
F 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
G 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
H
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
I 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
J
capillary or oil-return distributor is clogged. Replace the part.
SV
(SV5) Reducer
PMV2
Check valve
High-pressure sensor
Discharge pipe check joint
(TL)
Fusible
(SV3D)
plug
SV
(TD1)
Liquid tank
Liquid pipe check
joint
Gas-side Balance pipe
service valve packed valve
P o r c
M
Fan motor
Right-side
Main heat exchanger
Left-side
Main heat exchanger
4-way valve
SV
(SV2)
Oil separator
Check valve
Oil-return
(SV41)
capillary SV
SV
High-pressure
(TD2)
SW
High-pressure
SW
(SV3C
Compressor A3
(TK4)
1
(Inverter)
Check valve
Check valve
(TK1) (TK2)
Oil pipe
(TK5 )
(SV3E)
Oil-return
distributor
(SV3A)
(SV3B)
SV
Check valve
Check valve
– 260 –
e d u e r
Fan
(TO)
(TS1)
Low-pressure sensor
(SV42)
Accumulator
C
E
F
H