Service Information; Network Communication Abnormal; Basic Trouble Shooting Procedure - Fujitsu Airstage VR-II Series Service Manual

4-3 SERVICE INFORMATION

SERVICE INFORMATION

Network communication Abnormal

- Basic trouble shooting procedure -

1. Check Error code in one network segment separately, and check the Error code of (OU, IU, RB Error LED, RC, ST)
< If the system has more than 2 Net work segments, disconnect the other Network segment.>
2. Connect Service tool to the Outdoor unit, and try out "Address checker" Function by the Service toll.
< Check missing indoor unit or RB unit or outdoor unit by using Address checker function of Service tool>
3. Check terminal resistance value 53 Ohm + 5% + Line Resistance on the terminal borad one by one.
< Terminal Resistance is located on the Outdoor unit PCB(activated SET 5-4 ON), and the Main PCB of RB Unit each >
*Refer to the wiring diagram of Networlk cable
Exsample
Terminal Resistance A is located on the controller PCB of Outdoor unit as the Network for RB unit, Cooling only Indoor unit
Terminal Resistance B is located on the Main PCB of RB unit as the Network for Indoor unit 1
Terminal Resistance C is located on the Main PCB of RB unit as the Network for Indoor unit 2
Terminal Resistance D is located on the Main PCB of RB unit as the Network for Indoor unit 3 and Indoor unit 4
Outdoor unit1
< Main PCB >
(Master unit)
-SET 5-4:ON-
Terminal -
Resistance
A
53 Ohm
Transmission
Measurement
Terminal Resistance A
B
<Main PCB>
<Main PCB>
-Internal circuit -
-Internal circuit -
Terminal Resistance
Terminal Resistance
53 Ohm
53 Ohm
IN/U
Transmission
Indoor unit 1
Measurement
Terminal Resistance B
-
Outdoor unit 2
(Slave unit 1)
Transmission
Refrigerant piping
RB unit
C
IN/U
Transmission
Indoor unit 2
Measurement
Terminal Resistance C
Outdoor unit 3
(Slave unit 1)
Transmission
To other refrigerant circuit
Outdoor unit
RB unit
Measurement
Terminal Resistance A
D
<Main PCB>
-Internal circuit -
Terminal Resistance
53 Ohm
IN/U
Transmission
Indoor unit 3
Measurement
Terminal Resistance D
04-89
Dedicated cooling device
Transmission
Transmission
Indoor Unit
Cooling Only
Indoor unit 4
Measurement
Terminal Resistance A