Toshiba MM-A0160HX, Service Manual

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16
Forced Function of Oil Level Detection
Outdoor Unit
The oil level detection control can be forcibly implemented by a switch on the interface
P.C. 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
Operation procedure
1) Start the trial operation after alarm was cleared.
2) Set SW01/SW02/SW03 on the interface P.C. 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 P.C. board.
Oil level judgment result
Peripheral circuits of oil tank
Check code Check code name Judgment
d7
Low oil level detection Oil level shortage status has been detected continuously for approx.
protection 2 hours while oil equalising control was continuously implemented.
d8
TK1 temp. detection Temp. change at the oil tank primary side was not detected while oil level
circuit alarm detection control was implemented.
d9
TK2 temp. detection Temp. change at the oil tank secondary side was not detected while oil level
circuit alarm detection control was implemented.
db
Oil level detection circuit Temp. change at both the oil tank primary side and secondary side was not
blockage detection detected while oil level detection control was implemented.
dC
Oil level detection circuit The status of TK1 temp. is high (50°C or more) and was continuously
detected.
Result Judgment
[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.
7 segment display
Operation starts [OL] [– –]
During operation Counted down every 10 seconds from [OL] [1F]
Oil level detection control starts [OL] [FF]
During oil level detection counting Counted up every 1 second from [OL] [01]
Oil level judgment result [OL] [A0] [A1] [A2] [A3] [A4]
TK1 sensor
TK2
sensor
Valve
strainer
Oil
separator
Check joint
Strainer
Strainer
Strainer
Strainer
Capillary
Check
joint
Capillary
Accumulator
Compressor
Balancing pipe valve
SV3C
SV3A
valve
SV3B
valve Check
valve
Oil
removal
valve
Check
valve
Check
valve
Oil
tank