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Do I need a return h/w pipe stat from Arga sfw 355? Or can it be wired to the free programmer block In the Honeywell Sundial. First time I’ve used this forum. Wrote a longer version. 140. Limit. Y plan. There isn’t a connection block for pipe stat in the Sundial. Not using a room stat.tia.

I have installed an Arga sfw 355 with Y plan gravity fed Wiring Honeywell Sundial Rohs. Not using room stat nor progamer. Not working?