I’m assuming you are blowing out all your faucets, you want your compressor to be blowing air through each faucet one by one. When you blow air through your system it is going through where the water goes in the unit when you open the hot faucet . The manual makes no mention of blowing out at the unit just the water lines hooked to it.
One item I almost missed was blowing air through my black tank flush line if you have one you might want to do that.
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