Toshiba MMY-MAP1006FT8(J)P-E Service Manual page 260

<MMY-MAP1206 and MAP1406 >
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
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
B
A
(PMV1)
J
Fusible
plug
FP
Liquid Tank
I
1) Pressure nitrogen from check joint of the liquid pipe under condition that PMV1 and 4 are fully closed,
confirm the pressure using high-pressure check joint.
If pressure of the high-pressure check joint rises, leakage from any of PMV1, 4 (A, B) , check valve (D) and
discharge check valve (C) is considered. Therefore replace all PMV1, 4 (A, B), check valve (D), discharge
A,B
check valve (C).
C,D
2) If pressure did not rise, open PMV1 fully and then confirm pressure of the high-pressure check joint.
When pressure was up, open fully PMV4 only and confirm pressure of the high-pressure check joint again.
3) When pressure was up, there is leakage from check valve (D) and discharge check valve (C). Therefore
replace them.
If pressure did not rise, there is leakage from discharge check valve. Therefore replace them.
4) With pressure applied to the check joint of with nitrogen, if gas escapes from the discharge pipe section of the
E
disconnected compressor, there is a leak from the check valve of discharge pipe (E). Replace the part.
5) With pressure applied to the check joint of with nitrogen, if gas escapes from the oil equalization pipe section
F of the disconnected compressor, there is a leak from the oil equalization pipe check valve (F).
Replace the part.
6) With pressure applied to the check joint of with nitrogen, manually open the SV3B valve. If gas escapes from
G the suction pipe section of the disconnected compressor, there is a leak from the SV3A valve.
Replace the part.
7) 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.
8) With pressure applied to the check joint of with nitrogen, manually open the SV3E valve. If gas does not
I escape from the suction pipe section of the disconnected compressor, the SV3E valve or oil-return distributor
is clogged. Replace the part.
9) With pressure applied to the check joint of with nitrogen, manually open the SV3D valve. If gas does not
J 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.
(SV52)
SV
(PMV4)
(TE1)
(TE2)
SV
SV
(SV5）
SV
(TL1)
(SV6)
Oil separator
(SV3D)
SV
(SV41)
SV
(TD1)
(SV14)
(SV3E)
Procedure
Fan
M
Fan motor
Right side
Main heat exchanger
Right side Sub heat exchanger
Left side
Main heat exchanger
Left side Sub heat exchanger
(SV11)
High-pressure
sensor
(SV2）
SV
(SV42)
(SV3C)
SV
(TD2)
High-
(TK4)
pressure
switch
High-
Com-
Com-
pressure
pressor
pressor
switch
2
1
(TK1) (TK2)
Oil Header
(TK5)
(SV3A)
(SV3B)
SV
− 259 −
(TO)
C
4-way
valve
(TS1)
Low-pressure
sensor
E
(TS2)
F
Accumlator
G
H
0