Toyotomi TAG-A28EWI, Service Manual

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TROUBLESHOOTING GUIDE
INDICATION LAMP
check the drain hose by eyes (it might be folded or choked)
check the TAN whether lean or not
check the resistance of coil (2-way valve) by tester
(in case of dry operation) [see fig.5]
not cool down
not warm up
water leakage
in case of dry, not
dehumidify
louver doesn' t work check the resistance by tester [see fig.6]
check the point of leakage measure the pressure of compressor
during fixed operation (operation frequency 58 Hz)
nasty smell
FILTER IS CHOKED
NO USE FOR A LONG TIME
NASTY SMELL
(CIGARETTE, FURNITURE, ETC.)
DRAINAGE
MIS-INSTALLATION
LOUVER MOTOR
GAS LEAKAGE
2-WAY VALVE(TAN)
SENSOR, TEMP. ROOM
SENSOR, TEMP. HEAT EXCHANGER
4-WAY VALVE
SHORT CYCLE
(INSUFFICIENT AIR CIRCULATION)
check by eyes and clean it
use deodorizer
check the resistance by tester [see table 1]
check the resistance by tester [see table 2]
check the resistance by tester [see fig.4]
check the blockage of air inlet & outlet of TAN, TAG
- - - -
- - - -
- - - -
- - - -
- - - -
※ In this table TAN means indoor unit and TAG means outdoor unit.
CHECK A FOLLOWING STEPS
〔 fig. 3 〕 Voltage of TAN fan motor on the PCB(TAN main)
〔 fig. 1 〕 Resistance of sensor
(temp. power module)
〔 fig. 2 〕 Continuity of current fuse on the PCB (TAG main)
Take off the connector,
and measure the resistance between 3 and
4 in the connector.
table 4
15
3
4
upward
PCB(AE main)
0Ω
0Ω
FUSE
FUSE
＋ −
BL
PCB(TAG main)
TAN fan motor connector
R Y B W
4-way valve coil
1.5k
Ω
2-way valve coil
5.8k
Ω
common terminal
360
〜
390 Ω
power module
PCB(TAN main)
is Normal
Measure the voltage between
the connector pins in the back
of PCB (TAN main) during
cooling operation.
〔 fig. 4 〕 Resistance of 4-way valve coil
〔 fig. 5 〕 Resistance of 2-way valve coil 〔 fig. 6 〕 Resistance of louver motor 〔 fig. 7 〕 Resistance of Power module
Normal:1.5k Ω
※ Take off the connector and check the Resistance
of 4-way valve coil
Take off the joint connector of 2-way
valve(TAN), and measure the
resistance of it.
Normal:360 〜 390 Ω
Take off the connector and check the
resistance between the teminals
Measure the resistance, six times between
U-V, V-W, W-U respectively by changing
the polarity,and if all the figures show
infinite (more than hundreds of k
Ω
) then
it is normal condition.
Normal:5.8k
Ω
Take off the connectors 1 & 5 on the PCB (TAG main), and
check the continuity.
between red ＋ and black − approx.DC325V
between yellow ＋ and black − approx.DC3
〜
5V
between white ＋ and black − approx.DC15V
TAN/TAG-A53EWI