Hi, Need help please, I’m trying to wire in a second zone using circulating pumps . I have a Utica model MGB-100J forced hot water boiler. There’s a “Honeywell Integrated high limit electronic ignition control #240008781” on the boiler with one zone wired in working great. I believe I need to wire in a switching relay to control another zone. I'm thinking a Taco SR501 or a SR503, but don’t know how to wire it to the current Honeywell control on the boiler? Link to installation manual of my boiler here: [url]http://www.ecrinternational.com/secure/upload/document/3625.pdf[/url] Link to sr501 instruction sheet here: [url]http://www.taco-hvac.com/uploads/FileLibrary/102-375.pdf[/url] Link to sr503 instruction sheet here: [url]https://www.taco-hvac.com/uploads/FileLibrary/102-167.pdf[/url] Thank you for looking and hopefully somebody can help me.

New to the forum, so please excuse if this has been listed. My mother-in-law's home was built in 1964 with hot water heating system. Each room has the small radiator fin type heaters, some with the bleeding screw off fitting. System has a 12 psi intake valve and two hand valves. That's it. There is no mechanical switch, bypass, or thermal system that I can see. One valve (low) placed at low point of tubing, second valve (upper) placed near the ceiling directly above heater and lower valve, but tubing exists above the upper valve. To purge I turn off the pump, then open the lower valve until the water runs at fairly high rate, then close that valve. Then open upper valve until the water runs free, then close the valve. But upper valve allows only a small amount of water to exit, basically a trickle that does stop. At that point return system to operation. Does work, but gurgling occurs after a couple of weeks and requires redone. I did notice that with the pump running and upper and lower valves cycled, then water flows same as with pump off, but still noise. But, if run pump, open upper valve, and cycle furnace, then air exits from upper hose, with noise. This seems to imply an internal thermal valve that opens flow to heat the rooms. Nonetheless, still issue with gurgling and water noises. Therefore, how to correct or minimize this issue? Grateful, and with best regards, John