275
FDTN-H
• Function of jumper wires
Name Function
J1(SW5-1)
With 1 Phase model
None 3 Phase model
J2(SW5-2)
With Cooling only type
None Heat pump type
J3(SW5-3)
With Pulse input
None Step input
J4(SW4-1)
With
—
None
J5(SW4-2)
With Antifrost 2.5˚C
None Antifrost 1˚C
J6(SW4-3)
With With abnormality resetting
None Without abnormality resetting
J7(SW4-4)
With
4 position louver control: valid
None
4 position louver control: invalid
*1 With
FDKN208 type
J7(SW4-4) None
FDKN258, 308 type
• Function of DIP switched (SW3)
Switch Function
SW3-1
ON Power off guaranteed
OFF No power off guaranteed
ON With low-voltage detection
control
SW3-2
OFF Without low-voltage detection
control
SW3-3
ON Power up mode (UHi-Lo)
OFF Mild mode (Hi-Lo)
ON Indoor fan is Lo when heating
thermostat is OFF.
SW3-4
OFF Indoor fan is OFF when
heating thermostat is OFF.
Defective indoor unit heat exchanger thermistor
15
10
5
010 304020 50
5kΩ at 25˚C
Temperature (˚C)
Note (1) 22.5 kΩ at -6˚C
Return air thermistor (Th
I-A)
Indoor unit heat exchanger thermistor
(ThI-R)
Resistance temperature characteristics
Resistance (kΩ)
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
1
Indoor unit
Check Lamp (yellow) 1 time flash
Defective return air thermistor
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)
2
Indoor unit
Check Lamp (yellow) 2 time flashes
Note (1) Characteristics as per the above graph.
Note (1) *1 J7 (SW4-4) is for switching models on the FDKN Series.
(ii) Please match the settings of control switching switches (SW3, SW4, SW5) to the settings they had before they were
replaced. With these switches, if the printed circuit had a jumper wire before being replaced, set to jumper wire ON if there
was a jumper wire and jumper OFF is these was not.
(iii) Connect the fast-on terminals and connectors that are to the circuit board for the micro-computer.
Connect by matching the wire color of the fast-on terminal with the color printed on the circuit board for the micro-
computer.
Note (1) When connecting to the fast-on connection for the circuit board for the micro-computer, use care so as not to
excessively distort the circuit board.
(c) Inspection method when there are fault lamps (display lamps on indoor unit).
S Only case of wireless remote control model
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