Mitsubishi Electric SUZ-KA35VA2 Technical & Service Manual page 55

m How to check miswiring and serial signal error
Is the bus-bar voltage of the inverter P.C. board normal?
(Refer to "TEST POINT DIAGRAM AND VOLTAGE" of the outdoor unit.)
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-sec-
ond-ON quick blinking"? 3
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
• Reinstall
either the unit
or the light
away from
each other.
Is serial signal
• Attach a fi lter
error indicated 6
No
minutes later? on remote
control receiv-
Yes
ing section
of the indoor
unit.
B
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 upper lamp of OPERATION INDICA-
TOR lamp light up? <Confi rmation of the power
to the indoor unit>
Yes
Is serial signal error indicated 6 minutes
later?
Yes
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
Turn ON the power supply.
Yes
Yes
Replace the indoor electronic control P.C. board.
55
Check the power supply.
No
No
Check the wiring.
No
Is there any miswiring,
poor contact, or wire
disconnection of the
No
indoor/outdoor connect-
ing wire?
No
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confi rm the wiring is correct before the opera-
tion starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board is normal, LED blinks 6 times after 3
minutes.
No
Replace the inverter P.C. board. 2
No
(Lighted
2. Be careful of the residual voltage of smoothing
or not
capacitor.
lighted)
[SUZ-KA71VA2.TH]
Correct them.
Yes