2-Way Valve Leakage/Blockage Check Procedure; Blockage Check Procedure For Oil Return Circuit Of Oil Separator; [D8] Oil Temperature (Tk1) Detection Alarm - Toshiba HFCR407C Service Manual

( *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 PC board to
1/16/1, respectively.
3. Check the 7 segment display of the interface PC board.
In case of judgment result "A0"
In case of judgment result "A1"
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.
Check code
[d8]
Oil temperature (TK1) detection alarm
Is TK1 sensor out of place ?
No
Is there miswiring of
TK1/TK2/TK3 sensor ?
No
Is resistance value
characteristics of TK1 sensor
normal ?
No
Check interface PC board.
Troubleshooting
Diagnostic procedure for check code
Oil level is adequate. Resume the operation.
Oil level is insufficient. Check the following items.
Yes
Yes
Yes
109
When operation has started
During detection of oil level
Judgement result of oil level
SV3C
Sensor TK1
Capillary
•
(A)
Strainer
Sensor
TK2
Oil tank
Check
Valve
valve
SV3A
Check
•
(B)
valve
Balancing pipe valve
Operation cause
TK1 sensor out of place, miswiring, resistance value
characteristics error
7 segment display
"OL" "- - "
"OL" "FF" or "Numerical"
"OL" "AO" or "A1"
(D)
Check joint
Valve
strainer Oil Capillary
separator
Strainer
Compressor
Check
Oil
valve
removal
valve
Strainer
Modify sensor mounting.
Modify miswiring.
[ TK1 sensor: CN516 ]
TK2 sensor: CN515
TK3 sensor: CN507
Sensor error.
Accumulator
Check
joint
•
(C)
Valve
SV3B
Strainer
14