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AISIN
Aisin gas heat pump
(3) Diagnosing for current leakage
If the ground leakage circuit breaker trips,
measure insulation resistance values using a
megohmmeter and diagnose for current leakage.
Leakage diagnosing procedure
[1] Checking the 200-V units
If the resistance value can be recovered by
disconnecting the CN1, CN2, and CN4
connectors from the outdoor unit circuit board,
current is leaking from either of these
connections. Check each unit independently.
Example of DIP switch setting
Indoor unit address
Refrigerant piping
Communication
cable
Outdoor
unit
Outdoor unit
address
Indoor
unit
No.1
Remote control unit
SW1 SW2
[2] Checking the indoor units
If the resistance value can be recovered by
disconnecting the power terminals from the
terminal blocks of each indoor unit, current is
leaking from either indoor unit.
Note:
Do not connect the megohmmeter
communications circuits.
to
the
Indoor
unit
No.2
Remote control unit
(4) Checking the remote control circuit
Check the terminals of the indoor units and
remote control unit for incomplete electrical
contact and for wire disconnections.
(5) Checking the DIP switches
Check the DIP switches of the indoor and outdoor
units and remote control unit for incorrect settings.
Indoor unit No.
Indoor
unit
No.10
Remote control unit
Outdoor unit No.
Setting of the slide switch of the remote control unit
Sub
SW4
Outdoor unit
No. setting
Indoor unit
No. setting
Main
3-33