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sometimes ductwork under pressure and heat can experience a sudden deformation commonly referred to as oilcanning. this is where large rectangular pieces of box ducts have stiffening ribs formed into them to prevent deflection under pressure. if a particular panel is installed in just the right (or wrong) way, it can temporarily flex when it warms up. its ...


I'm dealing with the same problem in our "new" (1992 vintage) home. Long duct runs expand and contract with conditioning cycles. In places where the duct is held tightly against the home's framing or other objects, sudden slipping results in pops or squeaks. Solutions generally involve either 1) securing the duct more effectively at the contact point so it ...


I had the same problem on a 25 year old furnace. I thought the exhaust was stopped up again, But it was just the vacuum switch causing it. It had dust build up in it. All I had to do was blow into the line connected to the sensor, and it was fine.


Pipes from one radiator lead to another and do not cross, so you orient the radiator the same way as the other radiators on the same floor are oriented. If you only have one radiator, you will need to get into your neighbor's apartment to figure out which way the pipes are going.


Every bleeder. Some may not even be on radiators (depends on system layout/design - bleeder elbows are common, but more on baseboard than radiator type systems. If there is air trapped in a radiator, no water gets pumped through it. Circulator pumps are very limited devices. They don't do well at pushing air bubbles around the loop.


Normally, when the fan is set to "auto", if the unit enters "heating" mode the burner ignites then a heat sensitive device sends a signal to a relay which turns on the fan. The fan pushes heated air into the plenum and through the ducts but it also removes heat from the combustion chamber, so if the fan does not start or fails during operation, the burner ...

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