Mitsubishi PLA-ZM100EA.UK, Руководство по обслуживанию

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0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
< Thermistor for lower temperature >
Temperature (
:
)
Resistance (k
"
)
<Thermistor Characteristic Graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R
0
=15k
"
± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
0
:
15 k
"
10
:
9.6 k
"
20
:
6.3 k
"
25
:
5.4 k
"
30
:
4.3 k
"
40
:
3.0 k
"
Thermistor for
lower temperature
1
273+t
1
273
9-6-1. Thermistor
9-6-2. DC Fan motor (fan motor/indoor controller board)
Notes
· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit
board and fan motor.)
Self check
Symptom : The indoor fan cannot turn around.
1
2
Power supply check (Without fan motor connected)
Remove the fan motor (Remove the fan motor connector CNMF) and measure the
voltage in the indoor controller circuit
board.
TEST POINT
1
: V
DC
(between 1 (+) and 4 (
−
) of the fan motor connector): V
DC
280 V DC
TEST POINT 2
: V
CC
(between 5 (+) and 4 (
−
) of the fan motor connector): V
CC
15 V DC
Wiring recovery
Replace indoor controller board.
Replace defective fan motor.
Is the voltage normal?
Yes
No
Yes
Check method of DC fan motor (fan motor / indoor controller circuit board)
Is there contact failure? (loose connector, insert failure)
No
Wiring contact check
The contact of fan motor connect (CNMF)
Note: If the indoor fan does not operate after replacing the
indoor controller board, also replace the fan motor.
Note: If the indoor fan does not operate after replacing the
fan motor, also replace the indoor controller board.
OCH650