Fujitsu WATERSTAGE WOYG160LJL Maintenance Document page 122

Inverter PCB removal
3 Connectors of a power supply wire
Communication Connector
CT Connector
Pressure Switch Connector
Remove the 4 mounting screws
For screws of IPM and DB.
Note the tightening torque at the installation.
• Temporary tightening : 0.2 to 0.4 N.m
• Final tightening : 0.98 to 1.47 N.m
For screws of Comp. Wire and Reactor Wire..
Note the tightening torque at the installation.
Tightening torque is as follows.
• Final tightening : 1.4 to 1.6 N.m
Remove the 4 connectors (Power supply, CT, Communication and Pressure switch)
Remove the spacers (7 places)
Spread the heat transfer compound on IPM when you exchange INVERTER PCB by the repair.
Note at the installation.
1. Remove the old heat transfer compound as possible from IPM and Diode Bridges when you exchange INVERTER
PCB by the repair.
2. Spread the heat transfer compound evenly on IPM and Diode Bridges.
3. Prevent foreign matter from attaching to the surface of IPM and Diode Bridges.
Specifi cations for the heat transfer compound
Manufacturer Shin-Etsu Chemical Co.,Ltd
Grade G746
- 122 -
Total 7 speacers
Screws
(For Reactor Wire)
Screws
(For Comp. Wire)
Waterstage / Maintenance Manual / 2105 - EN