Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 155

(c) Outdoor inverter PCB replacement procedure
• Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:
WARNING
CAUTION
• Securely replace the PCB according to this procedure.
If the PCB is incorrectly replaced, it will cause an electric shock or fire.
• Be sure to check that the power source for the outdoor unit is turned OFF before replacing the
PCB. The PCB replacement under current-carrying will cause an electric shock or fire.
• After finishing the PCB replacement, check that wiring is correctly connected with the PCB before
power distribution. If the PCB is incorrectly replaced, it will cause an electric shock or fire.
• Band the wiring so as not to tense because it will cause an electric shock.
Replace the inverter PCB according to the following procedure.
(i) Model FDC71VNX
Replace the PCB after elapsing 3 minutes from power OFF .
1)
(High voltage is retained on the capacitor after turning the power off. It is very dangerous to touch the PCB
in this condition.)
n the situation that harnesses are connected to inverter PCB be sure to measure voltage (DC) between T26
I
and T27 on inverter PCB, and check that the voltage is discharged sufficiently. (Refer to Fig.2).
2) Disconnect the connectors and faston terminals from the inverter PCB as shown in Fig. 1.
3)
Match the setting of switches (JSW10, 11) of new PCB with former PCB.
4) Remove the harness bands (3 places) from the control unit, then remove the fixing screws (4places) from the
radiator. (Refer to Fig.3)
5) Remove the inverter PCB with radiator from the control unit, and exchange the inverter PCB with radiator.
Be careful not to pinch the wiring at the time of exchanging.
6) Fix the radiator to the control unit by screws. After exchanging the inverter PCB, reconnect the connectors, faston
terminals and the harnesses as before. (Confirm that the connectors are not half inserted.)
7) Attach the harness bands (3 places), then reconnect the harnesses as before.
8) Install the harness clip on the inverter PCB as shown in Fig.4, and fix the harness.
T21(Red)
T23(Blue)
T51(Yellow)
Parts No.
T52(Orange)
T26(Red)
CNI4
CNO1
Precautions for Safety
Indicates an imminently hazardous situation which will result in death or serious
injury if proper safety procedures and instructions are not adhered to.
Indicates a potentially hazardous situation which may result in minor or moderate
injury if proper safety procedures and instructions are not adhered to.
T22(White)
Fig.1Parts arrangement view of inverter PCB
154
- -
WARNING
CAUTION
Connectors are not half
inserted
CNG2
T29(White)
T30(Blue)
T28(Red)
T62(Orange)
T27(Blue)
JSW10,11
CNI2
Presence and shape of electric component
*
may vary according to model.
*( ) shows harness color.
'19 • PAC-T-327
PCA012D067B