new zone in every room?

Larry_10

why do you guys put a t-stat in every room with zone pumps

if one bedroom calls for heat wont the boiler heat up so fast that it would short cycle? because the zone is so small

if I did it in my house the boiler would short cycle!

I have the whole house now on one zone one hydro air one baseboard I tried it on 2 zones with to taco 007
but id have short cycle. now with hooking both pumps together I don't get short cycle anymore and the boiler never reaches high limit but I use one t-stat so the temp is not even on each zone

if you guys could tell me how I could put it back on 2 zones without short cycle let me know

thanks

lchmb

well

More often then not, more t-stat's are used to satisfy the customer. Because the boiler is sized for the total load their is no way to stop a short cycle on a small zone. It does not matter whether it's zone valves or circulators. Another problem with just one t-stat is if you close that small room off and the area with the t-stat stay's warm, that room may freeze causing an issue.

Larry_10

makes sense thank you I am putting in new baseboards in every room so it will work on one t-stat so if one room is 68 the rest will be also. im going to load each room and over size each room by 1 or 2 feet

thanks

lchmb

curious

If your running one zone are you splitting it or running one loop? If one loop what will be the total length?

Ron Schroeder_3

If your zone radiates less btu's than the boiler capacity, it still won't warm up any faster than it's own thermal mass will allow. Assuming it is not a low mass boiler, an aquastat that can have the high limit differential set to a wider delta T will prevent short cycling. A storage tank in the boiler loop will also help.

I run a 25 degree differential on my boiler to prevent short cycling since my total heating load is under 10,000 btu at 0 deg. F.

Ron

Larry_10

no each zone will be 2 loops one on each half of the house the garage side is baseboard right now and the boiler is on the other end of the house so that total loop is about 160ft that includes 46 ft of baseboard

the other side will be about 95 ft including about 48 feet
of baseboard

i am running a buderus g115-28 with 2107 and lt160 tank

thanks guys

lchmb

one?

And your only going to run it off one t-stat? Buderus is cold start, will only run up to what the control call's for. I think once you have that in place you won't have a problem breaking it down to multiple t-stat's...specially with HW...as to circulator's, I like them better than zone valves. If I have one circ fail I can keep the rest of the house warm, if you have ZV's with one circ and it fails then............:(