Joined on July 12, 2003
Last Post on December 5, 2013
@ December 5, 2013 10:35 AM in Taco Bumblebee CirculatorWell it sounds like you are here on Long Island or in New Jersey. The heat loss of the house has dropped dramatically. How big is each zone?
That makes sense since it got a little warmer here the last few days. The BBee is probably running on the lowest speed.
If the house is warm and comfortable, then you are doing great!
@ November 27, 2013 9:20 AM in Adjusting boiler K factor and pump delta Tdid the system start up? That delta T for a radiant slab is large.
If you are in outdoor reset and the system just started up, it is going to take a while to warm everything up.
But I have to start asking questions as to how long are the loops, what is the spacing, one zone or many?
@ November 27, 2013 9:17 AM in Taco wiring questionIs a three zone/ valve contoller
@ November 26, 2013 11:39 AM in Adjusting boiler K factor and pump delta TIs the delta T you are reading across the boiler or across the radiant?
Most radiant applications would like a 10 to 15 degree delta T across the manifold
If this is the delta T across the boiler, you are rockin along and it should be condensing nicely.
So, if you were to change the pump from constant to Delta T mode and the setting is 20 degrees and you have a 30 degree across the manifold, then the circ will run full speed until the delta T drops below 20.
@ November 26, 2013 11:33 AM in Taco wiring questionA Zone Valve Controller (ZVC) would be best to use here. The SR panel is meant for multiple circulators.
The transformer on-board is designed to power the circuit board and any thermostats. It may not be large enough to handle the extra power for the zone valves.
Your thermostats and zone valves would wire to the ZVC controller and then from there, wire the end switch to the existing SR panel to turn on the associated circ.
@ November 25, 2013 4:49 PM in PEX suport requimentsMost code bodies follow what the manufacturers suggest;
32" on the horizontal
4 feet on the vertical.
With that being said, check with local codes. I have run into some areas of the country where they may require different.
@ September 11, 2013 3:45 PM in On the right track? (Calculations)Katie,
Your flowrate of .55 gpm is for the entire room. If you have three loops, flow in each loop would .55/3 = 0.18 gpm per loop.
But as discussed earlier, I would use a 10 degree temp drop for radiant rather than 20. It will give the room a more consistent temperature.
So 5,500/(10*500)=1.1gpm and with three loops = 0.37gpm per loop.
When calculating the head loss, it depends upon the water temperature, the hotter the water, the easier it is flow so the viscosity changes.
Take a look here to figure out the water temperature needed based upon your heatloss. http://viewer.zmags.com/publication/9c73a879#/9c73a879/1
@ May 4, 2013 9:52 AM in T-StatI have also used this in car wash "ice prevention" projects. Its not for snowmelt (you wouldn't get your car washed when snowing!!) But the water dripping off the cars can freeze the entrance ramp.
@ May 3, 2013 4:34 PM in T-StatYou can use the tekmar 150 setpoint controller. Use the slab sensor not in the slab, but in a wall box or such. Setpoint Operation: -40 to 239+F
@ March 26, 2013 8:29 AM in Sandy still haunts my home!Is the system Pumping Away?
Pressure maybe a little low.
Air Separator may help (if its an air problem)
@ March 4, 2013 5:01 PM in 2013 Long Island BIG UGLY....who's in?????It was about time I got there, been wanting to make it for a couple of years, but it always seems like duty calls at the last minute.
It's great putting faces to the names that I see over the years here!
@ February 27, 2013 3:48 PM in 2013 Long Island BIG UGLY....who's in?????Looks like I'm in. Had to wait till we got closer to see what the schedule would bear. I may be a little late but may also bring Tim D with me.
@ February 12, 2013 10:24 AM in Need advice!You can take a look at alot of online classes where you can learn at your free time.
Here's one to consider at no charge http://flopro.taco-hvac.com/flopro_u.html
There are 10 different classes on a variety of topics
@ February 5, 2013 1:46 PM in Considering hydronically heating tub wallsI would just put the tube in the area itself under the tub deck. Lay it on the floor, it will heat up the air pocket around the tub. Not worth the extra effort to get it on the tub walls. Its a trapped air cavity.
Now I do know if you were to quik-trak the deck, that would be nice, don't insulate below and that will also heat the walls of the tub
@ February 5, 2013 9:24 AM in Taco FuelMizerThe FuelMizer is meant to be a circ relay for a new system. If you already have a circ setup, then you can use the FuelMizer as a boiler reset. Use it to just interrupt the boiler TT contacts. Setup is fairly straightforward, choose what temp outside you want the boiler to fire up to 180F, also with the dip switches, let it know what type of boiler is installed by choosing either min temp of 140 (non-condensing) or 70 (condensing).
If you need to see the target temp and the actual temps on a digital readout, then you can use the Taco PC-700. It costs more but gives you more.
@ January 23, 2013 3:07 PM in AquaPex in closed loopIt may be a heck of alot easier to isolate with a heat exchanger and isolate the non-barrier side from the boiler side. It will also mean other circulators (bronze or stainless), potable expansion tank.....rather than replacing all of the tubing.
@ January 20, 2013 5:45 PM in 0013 taco circulatorSo what was in before? You say the heat worked before the 0013 was put in. So where there any other changes to the system?
@ January 18, 2013 2:57 PM in Large heating bills - where to go from here2 boilers is a way to go, but I would not separate per floor. 2 smaller boilers on a staging control with weather responsiveness would be better
When milder outside temperatures are around, one boiler may be able to do the whole thing, where then two separate boilers would start to short-cycle like you see now with one big boiler.
@ January 14, 2013 10:34 AM in gpmIs also going to be dependent upon the head loss, then size your circ on that. 3/4" will give you a much higher head loss than 1", but if that fits in the realm of the circ, rock on.
Otherwise, 1" may be the answer
@ January 10, 2013 11:10 AM in Eliminating taco mixing blocks?You've got a lot going here with electronics and they are trying to make your home as comfortable as possible and also energy efficient.
You boiler is operating on a reset curve, it may need to be adjusted to get hotter water to the RMB's.
So the RMB is also modulating temperature based upon outside conditions and a target supply water temperature. If the boiler is not putting out a high enough water temp, then the RMB is starved and won't heat adequately.
The idea behind the RMB's is to modulate water temperature and to prevent major swings in air temperature. If they are removed and a very high temperature is sent to your floors, here is the scenario that take place;
Room is 69 degrees, setpoint is 70. Zone has not called for hours. Slab is cool, water in the slab is cool.
Call for heat occurs and the slab starts to heat up, you have 140 degrees slamming into the slab. Radiant is a slow and gentle beast, and it will take a while to change the air temp in the space. The first thing to heat will be the concrete, once that is warmed, then the air starts to warm up. Air temp now reaches 71 and the stats stops calling for heat. However the energy in the slab needs to go somewhere and it was slammed with a heck of alot of BTU's. The air temp in the space will only have to go up. It can reach 74-75 degrees very easily. This happens again over a long period of time say over a couple of hours.
Now the air temp starts to drop because the slab is cooling down. The air temp hits 69 and the stat calls for heat again, however the air temp continues to drop while the cold slab absorbs heat, before the air temp starts to climb again, it may be around 66 degrees. So now you are looking at easily a 9 degree temperature differential in the space.
I know there is lot here but to get to harsh and replace, it won't improve the situation.
There are a couple of things that need to be done,
1. A heat loss of the house on a room by room basis
2. Calculate the target water temperature needed for the RMB's
3. Adjust the boiler temp to be higher than the highest temp.
4. Make sure that the RMB circs are large enough to handle the load
5. Reprogram RMB if needed
I hope this helps
@ January 7, 2013 4:06 PM in Hot water boiler sizing..That would be a Low Water Cut-Off here is the link http://www.taco-hvac.com/uploads/FileLibrary/100-8.1.pdf