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Boiler piping configurations
I'm in the final stages of renovating an old multi-unit rowhouse, which includes all new heating systems using Burnham Alpine condensing boilers (one for the ground floor unit, and a second for the upper floors).
Without getting into too much background, it only recently came out that the GC & plumber have never before installed condensing boilers.
I'm now questioning whether the systems have been correctly piped, as the piping does not seem to be as per the Burnham I/O manual. In particular, I'm unsure about the lack of distinct boiler and system loops, and the use of the mixing valve for the radiant slab (instead of just lowering the boiler setpoint), and the water heater return connected prior to the boiler/system circulator.
I've attached diagrams for the two systems -- can anyone advise if there are glaring problems, issues that may cause poor performance, equipment failure, etc?
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