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A customer of mine has a hot water boiler with 6 circulators. The house is approximately 2400 s.f., and so some of the zones are rather small. The Circs are 007 IFC, and each is set at a different speed, as the owner thinks is necessary. The owner did a lot of reading and studying before he instructed the local oil company to install the boiler in this configuration. It is pumping away, and there is a spirovent between the boiler supply and the pumps. It has an extrol 30.
Heres the problem, it runs great for a while, then a zone becomes airbound, we would purge it all out & everything would be fine, then three weeks later we would be back. I know the classic answer is that the PONP is in the right place, and that the spirvent will not allow air in in this configuration but... Here's my question Is it possible that the circulators when they are all running are dropping the pressure to subatmospheric allowing air in, In other words exceeding the capacity of the extrol 30?
I would never have installed a system like this, but because I worked on it, I now own it, and I'm sure I'll be getting calls this heating season. Any thoughts