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Indirect Water Heater Install on Steam Boiler
I’m preparing to install a Weil McClain Aquaplus 45 on my very basic Hydrotherm VGA-200 Steam boiler. Going to follow the indirect manual, but had a few questions it doesn’t answer.
1) I’m using the 2nd 2” return taping on the right side of the boiler for the supply, the left side has the condensate return,equalizer, LWCO, and supply header. Return will feed after the Hartford loop, also where the fill connection is, so filling and flushing the indirect coil will be easy. This also allow my to use a long 9” immersion well for the DHW aquastat. Assuming I flow 8-10 GPM can I pull the maximum boiler capacity on longer DHW draws (indirect rating slightly exceeds boiler) or will too much water bypass pass right through the bottom of the boiler?
2) I had planned on taking advantage of my 2 stage gas valve and downfiring it when it exceed 180F, max limit 190F. (Will adjust if it overshoots and starts steaming, drop header will help trap the heat. Goal was to prevent stop short cycling with the pre-post purge losses. Any concern with doing this.
3) Any issue with the Y strainer being vertical? I’m short on space to fit the strainer and pump before I’m up to the water heater, and leaving enough room for the return pipe in the same plane, so I can avoid a a bunch of extra elbows and cleaner look.
Any other tips? I’ve put a boiler drain on about every low point elbow. Actually below the water line I think I only used Tee’s everywhere except the Wye on the Hartford loop