Coal Boiler Piping Schematic : First Draft

coalkirk · Post by **coalkirk** » Sat. Jan. 29, 2011 7:59 am

I have a circulator that runs 24/7 between coal and oil boilers. Boilers are at opposite ends of the basement. Then each of my zones has a circulator.

Sting · Post by **Sting** » Sat. Jan. 29, 2011 8:32 am

lsayre wrote:
AA130FIREMAN wrote:Lsayre, a relay is an electrical switch where low voltage (your wall thermostat) energizes a coil/magnet to make the switch for 120v line voltage ( that would run a pump). The ice cube relays look like an ice cube. Taco switching relays use them among others.
AA130FIREMAN and Sting: I can clearly see the value of this relay in a system with individual zone circulators. Where I'm having difficulty focusing upon its value is in a system with only one circulator. Would the ice cube relay be used in a system like mine to shut off the circulator when all zone valves are closed, and turn the circulator back on when at least one zone valve is open, negating the need for the DPBV loop, and saving some electricity that is otherwise wasted in running a 24/7 circulator?

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lsayre · Post by **lsayre** » Sat. Jan. 29, 2011 8:34 am

coalkirk, it appears that your 24/7 primary circulator loop, and my 24/7 single circulator loop are actually accomplishing the same goal, merely via different means.

lsayre · Post by **lsayre** » Sat. Jan. 29, 2011 9:23 am

This link has some info on a system utilizing a single circulator and a DPBV. See figure 5.4, and the discussion regarding the benefits of a DPBV. As far as I can tell, figure 5.4 is very similar to my schematic. The entire section 5 is relevant.

http://www.caleffi.us/en_US/caleffi/Details/Magaz ... s_5_us.pdf

Sting · Post by **Sting** » Sat. Jan. 29, 2011 9:43 am

Figure 3-9 also shows you the switching I was describing above

If you want to put the DPBV in -- do it it won't harm anything

lsayre · Post by **lsayre** » Sat. Jan. 29, 2011 9:44 am

Sting wrote:
lsayre wrote: AA130FIREMAN and Sting: I can clearly see the value of this relay in a system with individual zone circulators. Where I'm having difficulty focusing upon its value is in a system with only one circulator. Would the ice cube relay be used in a system like mine to shut off the circulator when all zone valves are closed, and turn the circulator back on when at least one zone valve is open, negating the need for the DPBV loop, and saving some electricity that is otherwise wasted in running a 24/7 circulator?
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Sting, I just ordered this set of 3 books. I found it on Amazon.com with free shipping so I went that route. Thanks!!!