Mitsubishi Electric MUFZ-KJ-NAHZ Series Service Manual page 32

MXZ Type
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn it ON again.
• Press EMERGENCY OPERATION switch.
Turn OFF the power supply.
Check once more if the indoor/outdoor connecting wire is not miswiring.
Remove the indoor/outdoor connecting wire from outdoor terminal block S3.
Bridge the outdoor terminal block S2 and S3. 1
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Press EMERGENCY OPERATION switch once.
Does the left lamp of the OPERATION
INDICATOR lamp light up?
<Con rmation of the power to the indoor unit>
Yes
Is serial signal error indicated 6 minutes later?
Yes
Is serial signal error indicated
6 minutes later?
Yes
C
(Refer to the next page.)
Check the power supply.
No
No
No
Is there any miswiring,
poor contact, or wire
disconnection of the
No
indoor/outdoor connect-
ing wire?
No
• Reinstall either the unit or the light away
from each other.
• Attach a lter on remote control receiving
No
section of the indoor unit.
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to con rm the wiring is correct before the opera-
tion starts.
32
Check the wiring.
Correct them.
Yes