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Circulator pump too fast? Lot's of info
Hi all, I've been lurking this forum for the last year. Thanks for all the info. I've spent a lot of time on different forum and I can say they help a lot.
I live in New Brunswick Canada (close to Main and just over the pond from the U.K.) We get cold long winters. -20 C (-4F) plus windchill in normal in December, January and February
We bought a house (bungalow) 38' x 60' with a 30' x 30' attached garage. So the basement is 38' x 60' as well.
The garage and the space under (30' x 30' X2) is not heated. (cold room and fire wood storage)
House was built in 1996 with 2x6 framing with a 8 ft foundation. House is really well insulated with being all outside brick walls. There's currently around 10'' of blown insulation in the attic (Will be adding an other 8'' soon). No leaking windows... Last year we ''heated'' the house with a 15000 btu heat pump up top and a wood stove (good for 3000 sq ft) in the basement. I say ''heated'' because we we're still cold (64f) in some area of rooms.
House has radiant infloor heating with slab. Main floor has 1.5-2.0 inches of slab and basement in unknowed (probably 4'' or even more). Dont know if its insulated on the bottom. Garage and under has been drained and isolated.
So the house was running with wood boiler, but I replaced with a propane boiler from NTI (FTV150C) combi model 95% eff. CO2 is set to 10.4% at max and 9.6% at min modulation. Modulation ration in 10:1 so the lowest input is 15 000 BTU's. Running open manifolds, no zone actuators. Flow have been set to regulated temperature in each room. Not ideal but seems to works good. Bedroom are about 65-66F, living room kitchen bathrom are around 67-68 F (this is all air temps). Slab is usually 1-2F max warmer than air.
Current setpoint at 0 f is 93F output. ODR seems to work fine. It was 28 F this morning and 84F water was comming out the boiler. I dont have any overshooting problems. I use a Honeywell/Aube TH135-01B non programmable thermostat. I have it set for 68F and its running classic mode with anticipation. Boiler may run for 3 hours at a time every 20 hours or so...
This boiler condensates like crazy. Dripping really fast. Almost a stream.
So before I ask some questions, here are some guide points.
I'm not after a 24/7 hot slab. We wear slippers and love touching each other with cold feet Hahaha. I see this system as one big radiator, not toasty warm feet machine. But I would like certains time of day to have warmer feet. Like wake-up time and supper?? time (5pm). I'm looking for maximum $$ saving and warmth when I need it.
Boiler- NTI 150C with combi DHW
Piping is primary/secondary loop. Boiler has internal pump and secondary loop is run by Armstromg astro 280CI at 167 W (this is one of my concerns)
Boiler piping in 1'' cooper to the manifolds.
Pex looks to be 1/2 I.D. but I have to double check.
Pex Spacing next to windows is probably 6'' (it runs hotter) and middle of room is probably 12''
System runs at 15 PSI.
First floor is running 7 zones and loop are between 200-300ft
basement is setup with 7 zones (same lenth) but I'm only running 2 zones (rooms with doors) because it was costing me way too much propane.
System has been flushed with Fernox F3 and added fernox F1 treatment.
Open manifolds (no zone actuators)
So this morning the boiler was heating at 84F and water return temps was 78 in no time. Over the course of the heating cycle, the return temp rises and so does the output temps (I think boiler wants to achieve delta T of 8f and more). If I set the pump on speed 2 (its currently on speed 1) the return temps seems to rise faster than speed 1. Even to the point where it exceeds the heat curve set points. (with speed 2...)
Is that circulator pump too fast? (Armstromg astro 280CI at 167 W)
I'm aiming for long run times between heat need. 2-4 hours twice a day. (I'll adapt run time... not raise water temps manually
I have an other pump on hand B&G SSF-22 at 92W
QUESTION 2: I would like to have heat when I need it.
I'm not after a nightly set back (the house is too well insulated anyways) All I want is heat when I want it, not in the middle of the night as the temps drop below thermostat set point.
So would the honeywell/aube TH140-28 work?
I know I could use a slab sensor, but I would have to chip my concrete and the thermostat is in the middle of the living room. The only was I would use a slab sensor would be in combination with air temps sensor. But I'm sticking with air temp thermostat for now. Like I said, not looking for warm feet 24/7.
Start heating at 3AM to 6AM (warm feet(69-70F) for wakeup) probably set thermostat at 75F (It will never reach 75 but the floor will be warmer. Air temps will rise to 67-68F
Leave for work and sunshine does is magic. I would set minimum air temp at 67F
Start back heating(set at 75F) around 3 PM until 6 PM. Warm feet (69-70F). air temps should be close to 70 with the sunshine of the day plus the heated slab releasing it's energy during the day. Temps should drop slowly during the night.
All of this with the ODR to regulate water temps.
So basically, I'm aiming for a heating schedual instead of it being temperature based.
I know I will have to modify the start and stop time a few times a year but I do not mind.
I'm thinking this schedule would offset the "sunshine setback" of daytime sun heat.
I'm not a plumber, hvac nor a radiant specialist. I'm a shop teacher. I teach welding, machining, electricity and small engine. But I read, read and read. I ask questions and find answers.
I have gotten this far. Just looking for heat at good times during the day and $$ savings.
I have done all the plumping, wiring etc.
If you havn't notice, I'm french. So my writing is not the best.
I have included a lot of information. More can be included if needed.
No I have not had a heat lost analysis. But everything is already running...
Hope this post is not too long.
EDIT: my propane comsumption is still around 5 gallon of propane/day. 475 000 BTU's /day for around 2800-3000 sq ft. That's 6.59-7.07 BTU/ sqft/hr