Forced Function Of Oil Level Detection - Toshiba MM-A0280HT Service Manual

Forced Function of Oil Level Detection

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
Check code Check code name
Low oil level detection
d7
protection
TK1 temp. detection
d8
circuit alarm
TK2 temp. detection
d9
circuit alarm
Oil level detection circuit
db
blockage detection
Oil level detection circuit
dC
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
Result
Oil amount in the compressor is adequate. Check that the operation continues and there is no
[A0]
problem. If [dC] occurred, execute check even if oil level was judged as adequate.
Oil level was judged as shortage. If this judgment continues, the system stops for protection.
[A1]
When [d7], [dC] occurred, check according to the check items.
TK1 temp. detection was judged as an error. If this judgment continues, the system stops for protection.
[A2]
When [d8] occurred, check according to the check items.
Oil level detection circuit (SV3C valve) was judged as blockage. If this judgment continues, the system
[A3]
stops for protection. When [db] occurred, check according to the check items.
TK2 temp. detection was judged as an error. If this judgment continues, the system stops for protection.
[A4]
When [d9] occurred, check according to the check items.
Peripheral circuits of oil tank
SV3A
valve
Outdoor Unit
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 judgment result
Judgment
SV3C
Valve
TK1 sensor
strainer
Oil
separator
Capillary
Strainer
TK2
sensor
Compressor
Oil
tank
Oil
Check
removal
valve
valve
Check
valve
Balancing pipe valve
105
Judgment
7 segment display
[OL] [– –]
Counted down every 10 seconds from [OL] [1F]
¡
[OL] [FF]
¡
Counted up every 1 second from [OL] [01]
[OL] [A0] [A1] [A2] [A3] [A4]
Check joint
Capillary
Strainer
Accumulator
Check
joint
Check
SV3B
valve valve
Strainer
Strainer
16