31
D How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
No
Turn ON the power supply.
Check the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confirmation of the power to the indoor
unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Yes
No
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connect-
ing wire?
Yes
Correct them.
No
Yes
Yes
Check for incorrect indoor-outdoor connecting wiring.
Is serial signal
error indicated 6
minutes later?
(Refer to MXY-2G20VA MXY-2G20VA2.)
Yes
• Reinstall either the unit or the
light away from each other.
•
Attach a filter on remote
control receiving section of
the indoor unit.
No
• Turn OFF inverter-controlled light-
ing equipment.
• Turn OFF the power supply and
then turn ON again.
• Press EMERGENCY OPERATION
switch.
*
1. Miswiring may damage the indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the opera
-
tion starts.
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Bridge the outdoor terminal block S2 and
S3.
*
1
MXY-2G20VA MXY-2G20VA2
Outdoor units are non-low-standby-power models.
OBH779C
