When fitting a secondary return to a large domestic property is it usual to tee the return in to the hot a one point? Or more than once? Is it usualy tee'd in at a hot draw off furthest from the hot water cylinder?
Balancing to avoid short circuiting, you want flow at all points.
Balancing to avoid short circuiting, you want flow at all points.
There are TRV-type valves available for HWS for this application; they sense the water temperature (not the air temperature as do TRVs) and close down as the water heats up. They're useful for big systems with a variable speed pump.
E.g.,
http://heating.danfoss.co.uk/xxTypex/209446_MNU17431795_SIT313.html[/QUOTE]
Can't think of the ones we've used lately. They aren't danfos but exactly the same thing. You set the temp on the head an there's a little dial to prove your return water temp.
More beneficial to long drops, say in vertical voids. We used them in a hotel refurb.wouldnt fir them for single outlets etc as no point in Te cost.
Have to look under the office desk later as I've got loads left.
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