antifreeze

jaybee

What is the procedure for putting anti freeze in a system.

kevin coppinger_4

well first...do you really...

need antifreeze? I am not a fan of it period. Too many issues and maintainence...If you raelly need to use it water quality is of the utmost. Clean and flush the waterside of the boiler then use distilled/deionized water if possible. Add/pump enough gylcol to attain the desired temp drop...50/50 is usually plenty...That is the readers digest condenced version...I am sure other can expound more....kpc

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S Davis

Antifreeze

Alot depends on the type of system but for radiant floor heating systems we usually fill and purge and let the system run for a couple of weeks to let the air purger scrub most of the remaining air out of the system, we then let the presure drop to zero by closing the fill and opening a bleeder at the highest point in the system wich is then closed, then we close the return valves on the manifolds and hook up a hose to the return manifold we then pump the antifreeze with a pony pump through the boiler drain and let the excess water drain out of the return manifold the antifreeze gets pumped up through the supply and through the tube pushing the excess water out the hose on the return manifold, once the antifreeze is pumped in shut the hose off on the return manifold and close the boiler drain and turn on the fill line, you do want to make sure when pumping in the antifreeze that you do not let the bucket go dry and introduce air into the system.
The other thing is to watch for the antifreeze at the manifold return because if your system is large and has multiple manifolds you might have to repete this procedure a couple of times to get the required amount of antifreeze in.

S Davis


Apex Radiant Heating

Mark Eatherton1

Some info...

can be found in an article I wrote some time ago.

http://contractormag.com/articles/column.cfm?columnid=113

ME

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Robert O'Connor_6

Mark Do you

have the link for part two of that article? I'd like to share it with someone. Good stuff!

Regards

Robert

ME

Alan_6

glycol

Adding antifreeze, should always be a last resort. It is less dense, than water, and has a higher expansion rate. Sometimes you have less output, need a larger pump, and a larger expansion tank. Many states require a double check valve (rpz) , instead of a standard backflow preventor. On natural draft boilers, it reduces the efficiency of the boiler, as much as 20%.

jaybee

What exactly do u mean by desired temp drop and what is the concept behind that?