Forced Function Of Oil Level Detection; Oil Tank Circuit System Error; Oil Level Judgement Result; Peripheral Circuits Of Oil Tank - Toshiba HFCR407C Service Manual

The oil level detection control can be forcibly implemented by a switch on the interface PC board of the outdoor unit. When
an error in the oil tank circuit occurs and there is no cause such as sensor error, connection error, sensor location error,
valve close operation error, etc., perform the following checks.

Oil tank circuit system error

Check code Check code name
d7 Low oil level detection
d8 Oil temp. (TK1) sensor alarm
d9 Oil temp. (TK2) sensor alarm
db SV3C valve blockage detection
dC SV3C valve leakage detection
Operation procedure
1) Start the trial operation after alarm was cleared.
2) Set SW01/SW02/SW03 on the interface
PC board of the outdoor unit to 1/16/1
respectively, for detection of oil level.
3) Push the push-switch SW04 for 2 seconds.
4) Check the 7 segment display on the PC board.

Oil level judgement result

Result Judgement
[A0] Oil amount in the compressor is adequate. Check that the operation continues and there is no problem.
If [dC] occurred, execute check even if oil level was judged as adequate.
[A1] Oil level was judged as shortage. If this judgment continues, the system stops for protection.
When [d7], [dC] occurred, check according to the check items.
[A2] TK1 temp. detection was judged as an error. If this judgment continues, the system stops for protection.
When [d8] occurred, check according to the check items.
[A3] Oil level detection circuit (SV3C valve) was judged as blockage. If this judgment continues, the system stops for protection.
When [db] occurred, check according to the check items.
[A4] TK2 temp. detection was judged as an error. If this judgment continues, the system stops for protection.
When [d9] occurred, check according to the check items.

Peripheral circuits of oil tank

16

Forced function of oil level detection

Outdoor unit
Judgement
Oil level shortage status has been detected continuously for approx. 2 hours while oil equalising
control was continuously implemented.
Temp. change at the oil tank primary side was not detected while oil level detection control was
implemented.
Temp. change at the oil tank secondary side was not detected while oil level detection control
was implemented.
Temp. change at both the oil tank primary side and secondary side was not detected while oil
level detection control was implemented.
The status of TK1 temp. is high (50°C or more) and was continuously detected.
Operation starts
During operation
Oil level detection control starts
During oil level detection counting
Oil level judgement result
SV3C
Valve
Sensor TK1
strainer
Capillary
Strainer
Sensor
TK2
Oil tank
Check Oil
Valve
valve removal
SV3A
valve
Check
valve
Balancing pipe valve
Check joint
Capillary
Oil
separator
Strainer
Accumulator
Check
joint
Compressor
Valve
Check
SV3B
valve
Strainer
Strainer
126
7 segment display
[OL] [- -]
Counted down every 10 seconds from [OL] F1]
[OL] [FF]
Counted up every 1 second from [OL] [01]
[OL] [A0] [A1] [A2] [A3] [A4]