Toshiba MMY-MAP0804HT7JP, Service Manual

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Ye
s
No
No
No stagnation
Ye
s
No
Error
Ye
s
Ye
s
No
No leakage or clogging No clogging No clogging
Stagnation No error
Clogging Clogging
Clogging
[H07]
e
s
u
a
C
e
d
o
c
k
c
e
h
C
Check code name
Oil level down detection protection
1.
V
alves of balance pipes closed. (On all outdoor
units in a line)
2.
Miswiring or misinstallation of
TK1 to
TK5 sensors
3.
TK1 to
TK5 sensor error
4.
Gas leak or oil leak in a line
5.
Refrigerant stagnation of compressor case
6.
SV3A, 3B, 3C, 3D, 3E, 3F valve error
7.
Clogging of oil return circuit from oil separator
8.
Clogging of oil-equation circuit system
Are balance
pipe valves of all outdoor
units in same line fully
opened?
Are TK1, TK2,
TK3,
TK4 and
TK5 sensors of
the error-detected unit correctly
connected?
Are all the sensors
properly connected?
Are
characteristics of
TK1 to
TK5 of error-detected unit
normal?
Check refrigerant
stagnation in
compressor
.
(*1) Check leakage of
valves (SV3A, SV3C) and
clogging (SV3B, SV3E,
SV3F).
(*2) Check
clogging of oil return
circuit from oil
separator
. (Capillary
tube, strainer)
Check clogging of
SV3D valve.
Check clogging
of solenoid valves (SV3A, SV3C) of all outdoor units
in the same line. (*3)
Are all oil levels
correct?
Open balance pipe valves fully
, reset power supply
,
and start operation. Sensor error
Replace
Specify gas leak position and repair it. (Recharging, refill oil) Replace faulty part. Replace faulty part. Replace faulty part. Replace faulty part.
Check gas leak of all outdoor units in the same line and check soaked oil in them.
Correct refrigerant stagnation in compressor
, reset power
supply
, and start the operation.
Clear cause of stagnation.
Check clogging of oil equalization circuit. (*4)
Check oil level judgment of each unit. The check result is indicated on the 7- segment display by setting [SW01/02/03] to [1/16/1].
Correct miswiring and misinstallation. TK1: CN531, black TK2: CN532, green TK3: CN533, pink TK4: CN534, yellow TK5: CN535, red
Indoor/outdoor PMV error (Cause of refrigerant stagnation), discharge check valve error
, etc.
(Reference) When refrigerant stagnates in compressor shell, the oil level shortage may be
Leakage or clogging
In some cases, it may be dif
ficult to check the leakage of clogging in the following condition of refrigerant
stagnation in low ambient temperature condition. In this case, take a longer operating time prior to check. (Criterion: Discharge temperature of
TD1 and
TD2 are 60°C or higher)
(*1) Checking leakage and clogging on solenoid valves
a)
Leakage check for SV3A
valve (For multiple outdoor unit system)
•
T
urn of
f the power supply
, take of
f connector of SV3A
valve, and then start a test operation after
power-ON.
•
Check the temperature change at secondary side of SV3A
valve during operation . ((1) in the figure.)
If temperature is raised, leakage occurs in the SV3A
valve. Replace SV3A
valve.
b) Leakage check for SV3C valve
•
T
urn of
f the power supply
, take of
f connector of SV3C valve, and then start a test operation after
power-ON.
•
After operation for several minutes, check temperature at secondary side of SV3C valve. ((2) in the figure.)
If temperature is high (equivalent to discharge temperature
TD), leakage occurs in the SV3C valve.
Replace SV3C valve. (Even if leakage does not occur in the SV3C valve, temperature of SV3C valve at secondary side rises during operation. But the temperature is lower than
TD when there is no leakage.)
c) Leakage check for SV3F valve (For multiple outdoor unit system)
•
T
urn of
f the power supply
, take of
f connector of SV3F valve, and then start a test operation after
power-ON.
•
Check the temperature change at secondary side of SV3F valve during operation . ((3) in the figure.)
If temperature is raised, leakage occurs in the SV3A
valve. Replace SV3A
valve.
d) Clogging check for SV3B valve (For multiple outdoor unit system)
•
While outdoor unit is operated, set up SW01/02/03 = [2] [1] [3] (7-segment display [Hr] [... ... ...]), and push SW04 for 2 seconds or more.
•
Set up SW02 = [10], and turn on SV3A, SV3B, SV3C valves. (7-segment display [Hr] [... 3 -])
•
While outdoor units are operating, check temperature change at secondary side of SV3B valve. ((4) in the figure.)
If temperature does not rise (equivalent to suction temperature), it is a clogging of SV3B valve.
Replace SV3B valve.
e) Clogging for SV3E valve
Reset the power supply
.
↓
Using "V
alve forced open/close function" of the outdoor unit, check ON/OFF operation (Sound, coil
surface temp up) of SV3E valve is performed.
↓
Start test operation in COOL
or HEA
T
mode.
↓
After operation for several minutes, check the pipe temperature at the secondary side of SV3E valve whether temperature changes or not. If it is equivalent to outside temperature, clogging of SV3E is considered. ((5) in the figure.) (Reference) If SV3E valve is clogged, temperature does not change at all sensors (TK1,
TK2,
TK3,
TK4 and
TK5).
f) Clogging check for SV3F valve
•
While outdoor unit is operated, set up SW01/02/03 = [2] [1] [3] (7-segment display [Hr] [... ... ...]), and push SW04 for 2 seconds or more.
•
Set up SW02 = [8], and turn on SV3C, SV3E, SV3F valves. (7-segment display [Hr] [... 3 C])
•
While outdoor units are operating, check temperature change at secondary side of SV3F valve. ((3) in the figure.)
If temperature does not rise (equivalent to suction temperature), it is a clogging of SV3F valve.
Replace SV3F valve.
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