Toshiba MM-A0280HT Service Manual page 89

( *1) Oil tank peripheral circuit leakage/blockage check procedure
1. After resetting the power supply, start a trial operation.
2. Set SW01/SW02/SW03 on interface P .C. board to 1/16/1, respectively.
3. Check the 7 segment display of the interface P .C. board.
When operation has started
During detection of oil level
Judgement result of oil level
In case of judgment result "A0" "A1"
In case of judgment result "A4"
is considered.
Check the following items.
4. Start a trial operation, confirm that
AC220V–240V-power is on to SV3C valve.
5. After operation for several minutes check the
temperature at the secondary side of SV3C (A.)
¡
When temperature is high (equivalent to
discharge temperature at (B)), valve is
not blocked.
¡
If blocked part is found, replace
the part.
6. During operation, check whether leakage
occurs in the check valve (two positions)
of pipe connecting the oil tank and
compressor case. Check temperature either side of (C).
¡
If leakage is found, replace the part.
14
7 segment display
"OL" "– –"
"OL" "FF" or "Numeral"
"OL" "AO" "A1" or "A4"
¡
Oil level is adequate. Resume the operation.
¡
Possibility of oil tank circuit leakage/blockage
90
Valve
SV3C
TK1 sensor
strainer
Oil
separator
(A)
(B)
Capillary
TK2
sensor
Compressor
(C)
Oil
(C)
tank
Oil
SV3A Check
removal
valve
valve
valve
Check
valve
Strainer
Balancing pipe valve
Check joint
Capillary
Strainer
Accumulator
Check
joint
Check
SV3B
valve
valve
Strainer