Toshiba MMY-MAP0804FT7(Z), Service Manual, Page: 209 / 333

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(*2) Chec
king the oil retur
n circuit from oil separ
ator and clogging in
SV3D v
alv
e
a) Oil retur
n circuit
• While outdoor unit is oper
ating, chec
k temper
ature (secondar
y side of capillar
y) on oil retur
n circuit.
((6) in the figure
.)
• If temper
ature is lo
w equiv
alent to suction temper
ature), a clogging of str
ainer of oil retur
n circuit or
→
capillar
y is considered.
Replace the clogged par
t.
b) Clogging chec
k f
or SV3D v
alv
e
• While outdoor unit is oper
ated, set up SW01/02/03 = [2] [1] [3] (7-segment displa
y [Hr] [...
...
...]), and
push SW04 f
or 2 seconds or more
.
• Set up SW02 = [
9
], and tur
n on SV3D v
alv
e
. (7-segment displa
y [Hr] [...
3 d])
• If temper
ature is lo
w at secondar
y side of the v
alv
e or it does not change
, clogging of v
alv
e
, capillar
y,
or str
ainer is considered.
((7) in the figure
.) Replace the clogged par
t.
(6) (7) (2) (5) (8) (1)
(8) (4)
Chec
k v
alv
e
High-pressure sensor
(TD2)
(SV2)
(SV3D)
(TK2)
(SV3B)
(TK1)
(TD1)
(TK4)
(SV3E)
(TK5)
(SV42)
3
Oil header
Distr
ib
utor
SV3C
SV
SV
SV
SV
SV
SV
SV
SV
(*3) Chec
k f
or solenoid v
alv
e of all outdoor units in a line (F
or m
ultiple
outdoor unit system) a) Clogging chec
k f
or SV3A v
alv
e
• While outdoor unit is oper
ating, set up SW01/02/03 = [2] [1] [3] (7-segment displa
y [Hr] [...
...
...]), and
push SW04 f
or 2 seconds or more
.
• Set up SW02 = [6], and tur
n on SV3A v
alv
e
. (7-segment displa
y [Hr] [...
3 A])
• If temper
ature is lo
w at secondar
y side of the v
alv
e or it does not change
, clogging of v
alv
e or chec
k
v
alv
e is considered.
((1) in the figure
.)
b) Leakage chec
k f
or SV3C v
alv
e
• While outdoor unit is oper
ating, set up SW01/02/03 = [2] [1] [3] (7-segment displa
y [Hr] [...
...
...]), and
push SW04 f
or 2 seconds or more
.
• Set up SW02 = [8], and tur
n on SV3C v
alv
e
. (7-segment displa
y [Hr] [...
3 C])
• If temper
ature does not change (up), clogging of v
alv
e or str
ainer is considered.
((2) in the figure
.)
(*4) a) Clogging chec
k f
or oil-equalization circuit
• Dr
iv
e the outdoor unit.
(Dr
iv
e all compressors in the unit.)
• After dr
iving f
or 10 min
utes or more
, chec
k whether temper
ature of
TK1,
TK2 and
TK3 sensors and
temper
ature of oil-equalization circuit capillar
y ((8) in the figure) has increased.
(Cr
iter
ion)
TK1,
TK2,
TK3=Td1,
Td2,
Td3 temper
ature - Appro
x.
10 to 30˚C
Oil-equalization capillar
y tubes should be higher sufficiently than outside air temper
ature and suction
temper
ature
.
• If temper
ature is lo
w
, a malfunction on chec
k v
alv
es or clogging of capillar
y, str
ainer or distr
ib
utor is
considered.
Repair the def
ectiv
e par
ts
.
Oil separ
ator High-pressure SW
High- pressure SW
Chec
k
va
lve
Chec
k
va
lve
Chec
k v
alv
e
Chec
k v
alv
e
Chec
k v
alv
e
Chec
k
va
lve
Compressor
1
(In
ver
ter)
Compressor
2
(In
ver
ter)
MMY
-MAP0804*
MMY
-MAP1004*
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