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A Steam Odyssey (Part 2): Midco Low-NOx Burner
The first Odyssey thread was getting rather long so I've started another specifically for the Midco burner and controls.
I'll let JStar comment on any specifics, but from my perspective the burner installation was pretty straightforward. The burner came in four pieces: the Midco controls cabinet, burner, blower, and valve train. I had to make a few modifications to the cabinet wiring to tie in my own controls cabinet, the flame rollout safety, and the solid state relay that acts as the "call for heat".
The valve train, starting from the blower, consists of a gas orifice, manual ball valve, Dungs FRG6 ratio regulator/zero governor, another gas orifice plate, and a Honeywell redundant combo gas valve. The blower is an ebm-papst RG175 electronically controlled centrifugal fan. Flame safeguard is via a Fenwal DS3565 gas ignition control. The only proprietary part is an RTC electronics board customized for Midco that regulates the blower speed. Except for the RTC board, everything is off-the-shelf parts.
Here are some photos of the burner installed on my Utica Starfire SFE steamer.
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