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I disabled a "working" furnace today
Earlier today I ended up shutting down a furnace when I was sent out originally just to do annual maintenance for a new customer. The furnace wasn't even two years old but it already was on it's second inducer motor. 120,000 BTU with 30' of 2" PVC for the vent. The vent was terminated on an inverted corner of the building. The vent piped was also sloped down from the boiler towards the wall. Because the vent was so undersized the inducer couldn't pull the-1.20" needed to close the pressure switch. The installer just left the switch jumped out. The installers decided the low gas pressure switch wasn't necessary when they did the LP conversion kit (installers were from the LP supplier).
I judged the furnace to be unsafe due to missing and bypassed safety devices and incorrect venting. The homeowner was furious that the LP company left it running like that
The return doubles as a central vacuum system