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Hvac
mmc239
Member Posts: 94
Hi. I am trying to change my capacitor on my central Ac unit. It is rusted on top and I can't see which terminal is herm, C, etc. how do I figure out which wire goes where?
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Comments
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The "c" terminal goes to the contactor, the "fan" to the fan, & the "herm" to the compressor.0
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Will I have to trace each wire back to each device? The old capacitor is rusted and I can't read the terminals.0
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best bet would be to trace each wire, then you know it's right0
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You can look at the wiring diagram that might be on the inside of the cover. It may give you colors which may still be visible on the wires.
Also I would install new connectors on the ends of the wires.0 -
I've been tracing out wires on rusted caps for 4+ decades. So, join the club!0
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check the schematic it will tell you what wire goes where, typically the brown with white is the herm"The bitter taste of a poor install lasts far longer than the JOY of the lowest price"0
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Is there a problem with the condenser, or you just want to change it? Do you have an RMS multimeter to read Uf?0
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The homeowner could buy several capacitors (condensers) for the price of the RMS meter for MFD checking.
I wonder how the rust ended up on the top unless rain got into the box. The crimp on connectors should be changed also IMO.0 -
Will the schematic be located near the capacitor?0
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It's usually attached to the inside of the cover. If not you may be able to Google the unit to find it. Or just snip the wire tys and trace the wiring0
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If this AC has some years on it the contactor in the same box/area you are showing may be worn out also.
Has water gotten into the capacitor area?
The crimp on connectors are aged and should be changed.
Your contactor contacts may be burned/pitted, you can not always seem without taking off a small arc guard cover.0 -
Still wondering if this is an operating problem or preventive maintenance?0
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