Got a somewhat stupid (atleast I'm kicking myself in the ass for not
knowing 100%) question about which direction a hydronic loop should flow and
thermostat location in relation to the flow.
My background was primarily comercial hvac/r and didn't do much with
residential hydronic systems. Got out of the trade about 5 years ago to go
into networking and have been here since.
Anyways...I'm in the middle of replacing my single pipe steam system
with a baseboard system. Entire old system is gone including boiler. Ran a
manual J (wrightsoft) and also ran a load calc with Slantfins Hydronic
Explorer, nice to see 2 different apps come out to within a 100 btu's of
eachother. Sizing is no question, all set there. My question which I'm
trying to verify again is direction of flow.....2 zone and a domestic loop
Zone 1.... 2 bedrooms and bath, 50% exposed wall, bdrm1 north/east facing,
bdrm2 south/east facing, bath south.
Zone 2.... living room, kitchen and sunroom, again 50% exposed wall, living
room north/west facing, kitchen south/west, porch got 3 exposures,
Do I want the flow to hit the coldest area's first (Zone1 bdrm1, Zone2
living room) or do I want to revese that due to the tstats being in those
rooms. I believe that the tstats are to be located at the end of the loop,
atleast thats what I remember, which tells me end of loops in bdrm1 and
living. Damn I hate being out of touch......
Sounds like your building a watch!
I use to try to be perfect all the time too, but then I kinda grew up
fast when it started to effect the pocket book. Do you really think
its going to make a rats ass of difference here in what you discribed
if the heat loss and unit size is correct. For christ's sake its a
small 2 bedroom house, no?
As far as the stat location lets see: zone1- bathroom?- no, lets take
a wild guess and say the primary bedroom of the two. zone2-
kitchen?-no, sun room- you've got to be kidding right- guess that
leaves the living room huh! A little common sense goes a long way.
Out of curiosity, what are you going to control the zones with (zone valves,
automatic valves, circ pumps)? Also, will your boiler be on (circulating and
keeping water hot) all the time? You might want to check out
http://www.tekmarcontrols.com/ for system design ideas. To answer your
original question, though, the control generally goes at the downstream end
of the zone.
Thanks Dean, thats what I thought. Zones are going to be controled by circ
pumps (007's). Boiler will be cold, switched when either a zone calls or the
domestic, at least thats what the plan is, I'd prefer not to cycle off the
limit control. I used to deal with Tekmar a lot, they make some real decent
controls, very reasonably priced too as I recall.
Sounds good, Brian. I would strongly recommend a controller such as Tekmar
when zoning with pumps. Be sure you read the installation instructions, and
understand the piping layout, as "ghost" flow is more of a problem as there
is not a positive shut off. You may want to consider using the new Grundfos
circ that has an integral check valve. It's also 3 speed, so you can slow it
down. I have found that, when done properly, zoning with circs is extremely
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