Panasonic 2WAY Multi Technical & Service Manual page 45

6
Water heat
exchanger
unit's control
6-1 Is AC200V ±10% being applied between TB1 R and S?
board and
surrounding
area
6-2 Is the varister (VA1) grounded or severely deteriorated?
6-3 Has the power switch (SW1) been switched on?
Are suitable DC voltages being applied to the circuits on
the board?
6-4 (Suitable DC voltage = approximately 5V between
TP1 and 2, approximately 7V between TP3 and 4, and
approximately 5V between TP5 and 6)
Is the varister (VA2) short-circuited between the phases or
6-5
severely deteriorated?
Is electrical voltage being output to the secondary side of
6-6
the fuses (F1, F2)?
Is electrical voltage being output to the secondary side of
6-7
the noise fi lter (RF1?)
Is electrical voltage being output to the secondary side of
6-8
the power transformer (PT1?)
● See "5. Reference Document" for details on the procedure for replacing the water heat exchanger unit's
control board.
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
IV–32
Request improvements
Yes to the power facility
manager
Proceed to 6-2 after
checking the wires and
No
terminals are normal
around TB1
Replace the varister
Yes
(VA1)
No 6-3
Proceed to 6-4 after
Yes checking the wires
around SW1
No Set SW1 to ON
Yes 6-8
No 6-5
Replace the varister
Yes
(VA2)
No 6-6
Yes 6-7
Check that the wiring
and terminals around
No
the fuses are normal
and replace the fuses
Yes 6-8
Check that the wiring
and terminals around
No
RF1 are normal and
replace the RF1
Replace the water heat
Yes exchanger unit's control
board
Check that the wiring
and connectors around
No
PT1 are normal and
replace the PT1