We seem to have run across something I have never experienced when installing a couple of Lochinvar boilers, that being psychotic regulators.
It was noticed on startup, that 'chugging' of the exhaust which accompanied a bouncing, yellow flame visible in the sight glass. It was a cold day so the exhaust reminded me of a steam locomotive, puffing down the track.
It was found that if the vent was removed from the regulator the problem would disappear. While a coworker was talking to the boiler manufacturer, they mentioned up-sizing the regulator vent to alleviate the problem. No change. Increased it to 2" going out, still no change. The 'chimney effect' was thrown about but it went by the wayside.
After a call to the regulator manufacturer the same coworker did find that the existing ones were far bigger than necessary, he ordered new ones and we installed them. The problem is about 90% gone now, where you can hear a slight fluctuation coming from the regulator vent. Before you could see the exhaust shaking, now you wouldn't know.
No matter how easy it is to install boilers, the simplest of things can make it a nightmare.
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