Toshiba MMY-MAP0804HT8JP Service Manual page 260

<MMY-MAP1404 and MAP1604 >
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
A
PMV1
B
J
F
I
G
Liquid-side
service valve
L o c t a o i n
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.
A,B
2) If the pressure does not increase, fully open outdoor PMV 1 and 2 and check the pressure at the check joint of
C,D
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.
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.
PMV2
(TE1)
PMV4
(TE2)
High-pressure sensor
Discharge pipe check joint
(TL) (SV3D)
Oil separator
SV
Fusible
plug
Liquid tank
(SV41)
SV
(TD1)
Liquid pipe check
joint
(SV3A)
Check valve
Gas-side Balance pipe
service valve packed valve
P o r c
M
Fan motor
Right-side
Main heat exchanger
Right-side sub-heat exchanger
Left-side
Main heat exchanger
Left-side sub-heat exchanger
(SV6)
SV
SV
(SV2)
Oil-return capillary
SV
(SV42)
(SV3C)
High-
High-
High-
pressure
(TD2)
pressure
SW pressure
SW
SW
(TK4)
Compressor
1
(Inverter)
(TK2)
(TK1)
(TK3)
Oil pipe
(TK5)
(SV3E)
(SV3F)
SV
Oil-return distributor
SV
– 259 –
e d u e r
Fan
(TO)
Check valve (sub-
heat exchangers)
Check valve
(main heat
exchangers)
4-way valve
(TS1)
Low-pressure sensor
Accumulator
SV
(SV43)
(TD3)
Compressor
3
(Inverter)
(SV3B)
Check valve
C
D
E
H