technical & service manual dc inverter multi-system air conditioner
technical & service manual dc inverter multi-system air conditioner
technical & service manual dc inverter multi-system air conditioner
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8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)<br />
8-1. Precautions before Performing Inspection or Rep<strong>air</strong><br />
Both the indoor unit and outdoor unit include electronic control circuits.<br />
Be sure to pay attention to the following before inspecting or rep<strong>air</strong>ing the outdoorside<br />
electronic circuits.<br />
High-capacity electrolytic capacitors are used inside the outdoor unit controller (<strong>inverter</strong>). They retain an<br />
electrical charge (charging voltage DC 311 V) even after the power is turned OFF, and some time is required<br />
for the charge to dissipate.<br />
Be careful not to touch any electrified parts before the control circuit board Power Lamp (red) turns OFF.<br />
If the outdoor control circuit board is normal, approximately 180 seconds will be required for the charge to<br />
dissipate. However, allow at least 30 minutes for the charge to dissipate if it is thought there might be trouble<br />
with the outdoor control circuit board.<br />
For example, if the outdoor control circuit board fuse has blown, approximately 30 minutes will be required to<br />
discharge the high-capacity electrolytic capacitors.<br />
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