Radiant Heat - Why Boiler Loop and Primary Loop?
Radiant Heat - Why Boiler Loop and Primary Loop?
(OP)
I saw a system the other day with 4 "stages" of pumping. There was a non-condensing "boiler loop" with a pump that fed a "primary loop." The "primary loop" had a pump that just circulated around in about a 15' perimeter. Pulling off of that were injection pumps that dumped into a "secondary loop". The "secondary loop" contained the manifolds and all the individual zone pumps. So, there were 4 different "stages" of pumping. I understand that the injection pump process is to inject small amounts of very hot water into the lower temp radiant loops while at the same time not allowing the boiler return water temp to get too low. And I understand the zone pumps. What puzzles me is why was there a "primary loop" seperate from the "boiler loop". Since the injection pump system is designed to protect the boiler, it would seem that the "boiler loop" and the "primary loop" could be one in the same. Any idea why they should be seperate; it just adds a pump to the system?





RE: Radiant Heat - Why Boiler Loop and Primary Loop?
RE: Radiant Heat - Why Boiler Loop and Primary Loop?
RE: Radiant Heat - Why Boiler Loop and Primary Loop?
RE: Radiant Heat - Why Boiler Loop and Primary Loop?
Most gas fired non condensing boilers will handle down to 140F return water temp. Oil fired is higher. The system sounds like a Joe Bob abortion to me. I'm sure it works... but it sounds like it has a lot of unnecessary complication and pumping and thus failure points.
Jabba
RE: Radiant Heat - Why Boiler Loop and Primary Loop?
RE: Radiant Heat - Why Boiler Loop and Primary Loop?