Toshiba MMY-MAP0806HT8P Service Manual page 265

<MMY-MAP10A6∗, MAP12A6∗, MAP1406∗, MAP1606∗, MAP18B6∗>
Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
C h e c k i e t m L
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 SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
(PMV1)
(TL1)
A
B
J
仮
Sub cool
heat exchanger
I
G
Liquid side
Service valve
o c t a o i n
1) With PMV1 and 3 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 PMV1(A) or 3(B) and check
valve of dischage pipe (C). Replace the faulty parts.
A,B
2) If the pressure does not increase, fully open outdoor PMV1 and 3 and check the pressure at the check joint
C
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 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.
(PMV3)
(TE1)
(TL2)
(TE2)
High-pressure
sensor
Oil separator
(TS3)
Fusible
plug
(SV3D)
SV
FP
(SV41)
SV
Liquid Tank
(TD1)
Compressor
(Inverter)
(PMV4)
(TL3)
Reducer
Balance pipe
Gas side
Service valve Service valve
P o r c e d u
Fan
M
Fan motor
Right side
Main heat exchanger
Right side Sub heat exchanger
Left side
Main heat exchanger
Left side Sub heat exchanger
SV
(SV2)
(SV42)
SV
High-
High-
pressure
pressure
(TD2)
switch
switch
(SV3C)
(TK4)
Compressor
1
2
(Inverter)
(TK1) (TK2)
(TK5)
Oil Header
(SV3A)
(SV3B)
SV
− 264 −
e r
(TO)
(TG1)
(TG2) C
4-way valve
(TS1)
Low-pressure
sensor
E
Accumulator
F
H