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Indirect tank circuit without air/dirt separation?
I've noticed in several boiler install manuals, where a piping diagram is provided for an indirect tank, the indirect is correctly piped in parallel, but the circuit typically does not include the air separation or dirt separation devices, which are placed either distant on the primary loop or on a secondary loop.
This means that during the non-heating months, when presumably only the indirect circuit is running (intermittently), that flow never sees the air or dirt separators.
Is this acceptable? Even if the indirect circuit is running only 45 minutes a day, over 6-7 months that's a lot of flow passing through the boiler without air or dirt separation.
So wouldn't it be best to ensure that the indirect tank circuit always includes air and dirt separation, even if that means longer pipes and more fittings?