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Forced function of oil level detection
Outdoor unit
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 Judgement
d7 Low oil level detection Oil level shortage status has been detected continuously for approx. 2 hours while oil equalising
control was continuously implemented.
d8 Oil temp. (TK1) sensor alarm Temp. change at the oil tank primary side was not detected while oil level detection control was
implemented.
d9 Oil temp. (TK2) sensor alarm Temp. change at the oil tank secondary side was not detected while oil level detection control
was implemented.
db SV3C valve blockage detection Temp. change at both the oil tank primary side and secondary side was not detected while oil
level detection control was implemented.
dC SV3C valve leakage detection The status of TK1 temp. is high (50°C or more) and was continuously detected.
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
7 segment display
Operation starts
[OL] [- -]
During operation
Counted down every 10 seconds from [OL] F1]
Oil level detection control starts
[OL] [FF]
During oil level detection counting
Counted up every 1 second from [OL] [01]
Oil level judgement result [OL] [A0] [A1] [A2] [A3] [A4]
Oil
separator
Sensor TK1
SV3C
Valve
strainer
Check joint
Capillary
Strainer
Accumulator
Check
joint
Capillary
Sensor
TK2
Compressor
Valve
SV3A
Oil tank
Check
valve
Check
valve
Oil
removal
valve
Valve
SV3B
Check
valve
Balancing pipe valve
Strainer
Strainer
Strainer
16
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