M380 Hurricane Heater

[cmillsap]

(02-21-2013 15:01)pgchin Wrote:  OK Chuck, Thanks
So I studied the picture again. I see the yellow handle after the tee which is what I think you are talking about. The other 2 yellow handle tees directly under the red handle valve, is each one the return side of each zone? The reason for the question is if they are, then you can attach a hose to zone 2 and put it in a pail, shut zone 1 and see if the circulator is pushing fluid though zone 2 or not. You still won't be able to determine if it is a blockage or an air pocket if it isn't, BUT it will determine that you will have to amp it up and actually isolate zone 2 and back flush it or physically inspect it, all big deals of time and effort. They always say when something stops working, go back to the last thing you touched. I presume you can't do that as I reread your first post and you stated this was an issue from the start but did the prior owner or dealer happen to mention any interior work? If they did some, maybe they kinked a hose or register accidentally in zone 2 and you can examine that one first????? I'm stretching here ole pal, this appears to be a duzzie!!!!! And I hate calling in a professional only as a last resort!!!!!!!!

Yes, those are the valves that open the hose bibs. both are on the same return line going back to the hurricane. Both circuits flow through a tee before the hose bibs. If you look at the pic again, you will see the green line attached to a tee left top corner of the metal panel and hose bibs.That's the return line fron zone 2. Look closely and you will see another hose coning to that tee that the green hose is attached to. That is the return line for zone 1. The tee is behind the metal plate and hard to see. The green hose in front stays cold when the unit is running, the hose in the rear is hot when the unit is running.