Toshiba MMY-MUP0721FT6P-UL Service Manual page 306

<MMY-MUP1201*,1441*,1681*,096H1*,120H1*>
Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
Check item Location
Leakage of outdoor PMV
Leakage of check valve in
discharge pipe convergent
section
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
Standard 10,12,14 ton / High heat 8,10 ton
Model: MMY-MUP1201*, MUP1441*, MUP1681*, MUP096H1*, MUP120H1*
仮
Subcool
Heat Exchanger
Liquid side
Service valve
1) With PMV 1, 2, 3 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 (A), 2 (B) or 3 (C) and
check valve of dischage pipe (D). Replace the troubled parts.
A,B
2) If the pressure does not increase, fully open outdoor PMV1 and 2 and check the pressure at the check joint
C.D
of discharge pipe again.
If the pressure increases, there is a leak from the check valve of discharge pipe (D). Replace the part.
3) 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
F
capillary or oil-return distributor is clogged. Replace the part.
M
Fan motor
A
PMV1
Main heat exchanger L
TL1
TE1
Sub heat exchanger L
B
TE2
PMV2
Hot-gas heat exchanger
PMV3
TL2
C
4WV3
High-pressure
sensor
TS3
SV
SV41
TD1
Compressor
PMV4
TL3
HP/LP Gas side LP Gas side
Service valve Service valve
Procedure
Fan
M
Main heat exchanger R
Sub heat exchanger R
TE3
Hot-gas heat exchanger
SV
SV5B
D
4WV2
SV
F
SV2
Oil separator
SV
SV3D
High-
pressure
switch
TK1
Symbol
SV
Solenoid Capillary Check Check
valve tube valve joint
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Fan
Fan motor
TO
TG1
TG2
TG3
4WV1
TS1
Low-pressure
sensor
Fusible
plug
Accumulator
SV3F
TS2
Temperature
Strainer Distributor
sensor