Toshiba MMY-MUP0801HT8P-TR Service Manual page 272

<MMY-MUP1601*, 1801* and 2001*>
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
MMY-MUP1601*, 1801* and 2001*
Subcool
Heat Exchanger
PMV4
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.
Fan
M
Fan motor
PMV1
Left side
Main heat exchanger
TL1
TE1
Left side
PMV2
Sub heat exchanger
TE2
PMV3
TL2
Check Valve
TS3
High-pressure
sensor
High-
SV
pressure
switch
SV41
TD1
TL3
Gas side
Service valve
Procedure
M
TO
Right side
Main heat exchanger
RIght side
TG3
Sub heat exchanger
TE3
SV
Accumulator
SV3D
TK1
Symbol
SV SV
Solenoid Capillar y Check
Check
Strainer
valve tube valve joint
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Fan
Fan motor
TG1
TG2
4-way valve
TS1
Low-pressure
sensor
SV3F
Temperature
Distributor
sensor