I would think they are separate.

來源: RomaVacation 2024-01-22 10:55:44 [] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (239 bytes)

Don't short pressure switch unless you are sure it is bad. Some people suck it to test. Google you tube. 

If exhaust can not be vented and you short pressure switch. it could be risk. 

 

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