Gas and Oil Home Heating Furnaces - bypass on high efficiency low volume boiler

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stephen001
02-23-03, 07:48 PM
peerless pinacle (same as Munchkin). peerless piping diagram makes no
mention of boiler bypass and primary pump. I have 2 zones plus indirect water
heater (3 circulators). Munchkin calls for a 4th circulator on return piping also incorporating a bypass. 4th circulator is active when any other circulator is running.
Is this neccessary? and if so, why?
Thanks in advance.

KField
02-24-03, 12:04 PM
It is best not to have water temp in boiler below 100 degrees. It tends to cause fireside condensation and that creates scale and 'popcorn'. It also isn't good to have stack temps below 350 and you can't always prevent that without a bypass. If you have a reverse aquastat, it can cycle several dozen times before the water is hot enough to continue circulating and a bypass prevents that too. It lets the boiler operate inside the criteria it was designed for and give as much heat as possible to the zones without damaging itself. These things pertain to oil systems more than gas and you didn't say which you had. So take that under advisement. I always put a bypass in. You can close it if you don't need it, but if you do and you didn't install it, it makes a lot of extra work.