Electrical System - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ Electrical System

Outdoor Unit Overvoltage
Check for possible causes in the list below (this list is
not exhaustive):
• Problem with the compressor.
• Main board.
• Faulty power relay.
Inspection of the Power Transistor Module (Main board)
Disconnect the compressor relay and the condenser connection. Measure the resistance value at the points shown
on the illustration, and then compare the values observed with those in the table.
Multimeter
- 44 -
Terminal block
Resistor
1 MOhm
or more
Steps to be followed before performing any work on
the Inverter module:
• First switch off the system using the circuit breaker at
the head of the line.
• Remove the unit cover and then remove the Inverter
module cover.
• Measure the voltage at the condenser terminals.
You should fi nd a value of 5 Vdc or less.
3-phase type
Waterstage / Maintenance Manual / 2105 - EN
Single phase type
N
W
V
Main PCB
U
P