VA-600 Bypass
- Lightning
- Site Moderator
- Posts: 14669
- Joined: Wed. Nov. 16, 2011 9:51 am
- Location: Olean, NY
- Stoker Coal Boiler: Modified AA 130
- Coal Size/Type: Pea Size - Anthracite
If I recall correctly, a bypass goes between the main supply and return of the boiler so that water can naturally circulate while the pump is off. If that is proper, what is stopping water from using the bypass while the pump is on?
-
- Member
- Posts: 2379
- Joined: Sun. Mar. 25, 2007 8:41 pm
- Location: Ithaca, New York
- Stoker Coal Boiler: Keystoker KAA-4-1 dual fuel boiler
- Hand Fed Coal Boiler: former switzer CWW100-sold
- Coal Size/Type: rice
- Other Heating: kerosene for dual fuel Keystoker/unused
The boiler bypass whether it is controlled by a metering valve or a ball valve lets some or most of the cooler water coming from the herd of tube radiators on the upper floors bypass the boiler to prevent condensation from occurring in the firebox as the water in the steam chest will remain hotter in temperature and avoid shocking the boiler.
-
- Member
- Posts: 2379
- Joined: Sun. Mar. 25, 2007 8:41 pm
- Location: Ithaca, New York
- Stoker Coal Boiler: Keystoker KAA-4-1 dual fuel boiler
- Hand Fed Coal Boiler: former switzer CWW100-sold
- Coal Size/Type: rice
- Other Heating: kerosene for dual fuel Keystoker/unused
If the return water stays below 130 Degrees Fahrenheit, yes.
- Rob R.
- Site Moderator
- Posts: 18009
- Joined: Fri. Dec. 28, 2007 4:26 pm
- Location: Chazy, NY
- Stoker Coal Boiler: EFM 520
- Hand Fed Coal Stove: Chubby Jr
It depends how it is piped. If you pipe it from different tappings than those used by the supply and return header, flow in one circuit won’t cause flow in the other. A boiler bypass, system bypass, and an equalizer loop are 3 different things.
If using constant circulation and you don’t expect to encounter low return temperatures, no additional piping is needed.
- nepacoal
- Member
- Posts: 1701
- Joined: Wed. Nov. 21, 2012 7:49 am
- Location: Coal Country
- Stoker Coal Boiler: Keystoker KAA-4 / "Kelly" and an EFM 520 at my in-laws
- Hand Fed Coal Boiler: Harman SF-260 - retired
- Coal Size/Type: Buck
If you have a high volume system like big cast iron radiators, you may want/need the bypass (especially in the shoulder months with 100+ gallons of 70° water coming back). Plain old baseboard heat, probably not needed...