Precautions Before Maintenance - ACPro A Series Service Manual

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3. MAINTENANCE

3.1 PRECAUTIONS BEFORE MAINTENANCE

9.1 Precautions before Maintenance

There are high-capacity electrolytic capacitors on the outdoor mainboard. Thus, even the power is cut off, there is high voltage inside

1. Make sure to leave 20 minutes AFTER power has been shutdown to work on the outdoor unit. High-

the capacitors and it needs more than 20min to reduce the voltage to safety value. Touching the electrolytic capacitor within 20min after

capacity electrolytic capacitors on the mainboard MUST reduce voltage to safely perform maintenance.

cutting the power will cause electric shock. If maintenance is needed, follow the steps below to discharge electricity of electrolytic ca-

Touching the electrolytic capacitors under 20 minutes after power cut-off WILL cause severe electric shock. If

pacitor after power off.

maintenance is needed, follow the steps below to safely discharge built-up electricity after power-off.

(1) Open the top cover of outdoor unit and then remove the cover of electric box.

2. As shown above, connect the plug of discharge resistance (about 100ohm, 20W). If there is no discharge

(2) As shown in the fig below, connect the plug of discharge resistance (about 100ohm, 20W) (if there is no discharge resistance, you

resistance, you can use the plug of soldering iron to points A and B of electrolytic capacitor. There will be

can use the plug of soldering iron) to point A and B of electrolytic capacitor. There will be sparks when touching them. Press them forc-

ibly for 30s to discharge electricity of electrolytic capacitor.

sparks when touching points A and B. Press down on them forcibly for 30 seconds to discharge electricity

of electrolytic capacitor.

(3) After finish discharging electricity, measure the voltage between point A and B with universal meter to make sure if electricity dis-

charging is completed, in order to prevent electric shock. If the voltage between the two points is below 20V, you can perform mainte-

3. After discharging electricity, measure the voltage between points A and B with universal meter to make

nance safely.

sure electricity discharging is complete in order to avoid electric shock. If the voltage between the two

points is below 20V, you can perform maintenance safely.

cover of electric box

outdoor mainboard

Installation and Maintenance

Service Manual

discharge resistance or

plug of soldering iron

Technical Information

Installation and Maintenance

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