Toshiba MMY-MUP0801HT8JP Service Manual page 268

<MMY-MUP0801*, 1001*, 1201* and 1401*>
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-MUP0801*, 1001*, 1201* and 1401*
Subcool
Heat exchanger
Liquid side
Service valve
1) With PMV 1, 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 (A) or PMV2 (B) and
A, B, D check valve of discharge pipe (D). Replace the troubled parts.
2) If the pressure does not increase, fully open outdoor PMV 1, 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 (D). Replace the part.
3) With pressure applied to the check joint of discharge pipe with nitrogen, manually open the SV3D valve. If gas
F does not escape from the suction pipe section of the disconnected compressor, the SV3D valve, oil-return
capillary or oil-return distributor is clogged. Replace the part.
PMV1
TL1
TE1
PMV2
TE2
TL2
High-pressure
sensor
TS3
SV
SV41
TD1
PMV4
TL3
Gas side
Service valve
Procedure
Fan
M
Fan motor
TO
TG1
Main heat exchanger
TG2
Sub heat exchanger
4-way valve
Accumulator
SV SV
High- SV3D
pressure
switch
TK1
Symbol
SV
Solenoid Capillary Check Check
Strainer
valve tube valve
joint
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TS1
Low-pressure
sensor
SV3F
Temperature
Distributor
sensor