Toshiba MM-A0280HT Service Manual page 87

( *1) 2-way valve leakage/blockage check procedure
1. After resetting the power supply, start a trial operation.
2. Set SW01/SW02/SW03 on interface P .C. board to
1/16/1, respectively.
3. Check the 7 segment display of the interface P .C. board.
In case of judgment result "A0" ¡ Oil level is adequate. Resume the operation.
In case of judgment result "A1" ¡ Oil level is insufficient. Check the following items.
Remove SV3C valve coil, reset the
power supply, and start the trial operation.
4. After operation for several minutes, check
temperature at secondary side of SV3C
valve (A).
¡
When temperature is high (Equivalent
to discharge temp.), leakage occurs
from SV3C valve.
Replace SV3C coil.
5. Remove SV3A coil, and start a
trial operation under condition that
AC220V–240V-power is on and SV3C valve
is connected.
6. After operation for several minutes, check
temperature at secondary side of SV3A
valve (B).
¡
When temperature is high (equivalent to discharge temp.), leakage occurs from
SV3A valve.
Replace SV3A coil.
7. Using charge hose, etc., connect the check joint of gas pipe (D) and the charge port of
balancing pipe.
8. Start a trial operation under condition that AC220V–240V-power is and to SV3B valve is
connected.
9. After operation for several minutes, check temperature at secondary side of SV3B valve (C).
¡
When temperature is low (equivalent to suction temp.), blockage occurs in SV3B valve
or strainer.
Replace blocked part.
( *2) Blockage check procedure for oil return circuit of oil separator
1. Check temperature of oil circuit during operation of outdoor unit.
¡
If temperature is low, clogging occurs in capillary or strainer. Replace blocked part.
14
TK1 temperature detection
Is TK1 sensor out of place?
Is there miswiring of
TK1/TK2/TK3 sensor?
Is resistance value
characteristics of TK1 sensor
Check interface P .C. board.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[d8]
circuit alarm
Yes
No
Yes
No
Yes
normal?
No
When operation has started
During detection of oil level
Judgement result of oil level
SV3C
Valve
TK1 sensor
strainer
Capillary
(A)
Strainer
TK2
sensor
Oil
tank
Check
SV3A
valve
removal
valve
valve
Check
valve
(B)
Balancing pipe valve
Operation cause
TK1 sensor out of place, miswiring, resistance
value characteristics error
88
7 segment display
"OL" "– –"
"OL" "FF" or "Numeral"
"OL" "AO" or "A1"
(D)
Check joint
Capillary
Oil
separator
Strainer
Accumulator
Check
joint
Compressor
(C)
Check SV3B
Oil valve
valve
Strainer
Strainer
Modify sensor mounting.
Modify miswiring.
[ ]
TK1 sensor: CN516
TK2 sensor: CN515
TK3 sensor: CN507
Sensor error.