Mitsubishi FDT208HEN-S, Инструкция по эксплуатации

Страница: 67 / 74

277
FDTN-H
YES YES
YES
NO
NO
Does the
voltage oscillate
between DC6 and 10V
between control switch
circuit board connector
(CnB
2
) Y (White)
to Z (Black)?
Does the
voltage oscillate
between DC6 and
10V between indoor unit
PCB connector (CNB)
2 (White) to 3
(Black)?
YES
NO
NO
Is there
DC 10.8V
between control
switch circuit board con-
nector (CnB
2
) X
(Red) to Z
(Black)?
Is there
DC 10.8V
between indoor unit
PCB connector (CNB)
1 (Red) to 3
(Black)?
YES
Defective indoor
unit PCB
Power
supply
reset
Is it
normalized?
NO
Unit is normal
(Intrusion of accidental
noise on the control switch
cord)
Defective control
switch PCB
(1)
The control switch wiring
(white) or (black) is broken or
have a defective connection.
Defective control switch
PCB Replacement
Defective indoor unit PCB
Replacement
The control switch wiring (red)
or (black) is broken or have a
defective connection.
15
10
5
0 10 30 40 20 50
5k
Ω
at 25˚C
Temperature (˚C)
Note (1) 22.5 k
Ω
at -6˚C
Return air thermistor (Th
I-
A)
Indoor unit heat exchanger thermistor
(Th
I-
R)
Resistance temperature characteristics
Resistance (k
Ω
)
YES
YES
NO
NO
Is the indoor
unit heat exchanger
thermistor connector
connection OK?
Correction
Are characteristics
of indoor unit heat
exchanger thermistor OK
or is not there any
broken wire?
Defective indoor unit PCB Replace-
ment (Defective indoor unit heat
exchanger thermistor input circuit)
Defective indoor unit heat exchanger
thermistor Replacement
YES YES
NO NO
Is the return air
thermistor connector
connection OK?
Correction
Is the return air
thermistor characteristics
OK or is there a
broken wire?
Defective return air
thermistor Replacement
Defective indoor unit PCB
Replacement (Defective return air
thermistor input circuit)
Note (1) Characteristics as per the above
graph.
S
Only case of wired remote control model
1
Error display :
e 1
[Communication error between control switch ~ Indoor unit PCB]
2
Error display :
e6
[Defective indoor unit heat exchanger thermistor]
3
Error display :
e7
[Defective return air thermistor]
Note (1) If it is normalized by changing PCB, judge the control switch or indoor
unit PCB (Communication error between control switch and unit) is
detective.
• Normal voltage for control switch wiring (DC)
Between X and Z : 10.5 ~ 10.8 V
Between Y and Z : 5 ~ 10.8 V