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Posted by HeatPro on September 19, 2009 at 23:32:21:
In Reply to: Re: HONEYWELL BP900 Backflow Preventer posted by mike on September 19, 2009 at 21:11:46:
In most areas, adding a backflow preventer is involved with the local water supply. If this is about a well system, then that isn't involved.
Operationally, the backflow overcomes at least 40 psig, so vertical wouldn't be a pressure difference problem; but I'd call Honeywell to find out, as the drawings for the device show it only in the horizontal position.
http://www.alpinehomeair.com/_viewresource.cfm?resourceID=1096
"Vertical installation of backflow preventers will be accepted if the device is approved by the State for that type of configuration. ..."
http://www.westchestergov.com/health/Forms/PublicWaterSupply/Request_to_Install_Backflow_Device.pdf
http://www.socalabpa.org/InstallationCriteria.pdf