Joined on July 12, 2003
Last Post on February 17, 2014
@ February 17, 2014 10:43 AM in Taco bumble bee flow meter accuracyThe readings on ECM circs are an estimate. The algorithum's used are based upon the RPM of the motor, not the actual flow.
@ January 27, 2014 4:17 PM in AHR attendees, What did you see?......product. I was soooo busy talking with people at the "Emerald City" that I barely had a chance to wander the show floor. It was busy, exciting, fun.....lots of different emotions at one of the largest places where us freaks have a chance to hang out.
Saw lots of old friends that I hadn't seen in a while, met people for the first time that I had only met here on the "interwebs" or on the phone.
And then tons of guests for the first time. When I got home, the most the family got out of me were one word sentences, I was shot!
Can't wait till next time!
@ January 27, 2014 2:51 PM in Taco I series Mixing valves?I see no issue with using the two in the system. Modulate the water temp with the i-valve and let the BumbleBee do its thing.
As for controlling, the i-valve does not have to be activated on a call for heat. Supply 24volt power and hook up the sensors and it will modulate. It can accept an endswitch call form a zone relay.
As for the circulator, it depends upon how many zones (if any) you have planned and how the zoning procedure is setup (zone valves or pumps)
@ January 27, 2014 2:47 PM in Taco I series Mixing valves?Drew,
Take a look here http://www.taco-hvac.com/uploads/FileLibrary/102-145.pdf for the i-valve instructions.
In particular take a look on page 2 the graphic labeled "3-way iseries valves". This gives you the best description for what you are looking to do.
Use the BumbleBee for the system loop circulator. The boiler loop circulator will probably be specified by the boiler chosen. If using a mod-con boiler, I would suggest the BumbleBee for the boiler loop in the Delta T mode. If this size circ fits, you can use it in the constant speed mode.
@ January 14, 2014 9:46 AM in Upgrade to old systemJust splitting up the zones and the radiation part will help with the comfort levels in the home. You've got different types of radiation and they respond differently as you can tell.
The front satisfies quickly therefor starving the back of the house for heat. Separating the zones with zone valves will let each area run until comfortable. However, doing the math with ensure that the size of the zone valves are accurate and the BumbleBee will provide the correct gpm at maximum demand. If it does not fit the demand of the system, you can still look at a 00VDT to get the same results.
Adding outdoor reset will also help with the economy of operation but will not adjust the heat delivery to the room. Meaning, if all you do is add reset and change nothing else, you will experience the same situation as you have now.
@ January 14, 2014 9:21 AM in Wiring Lochinvar Knight + single Grundfos AlphaThe Zone Sentries have a dedicated end switch. This contact closes when the valve is open.
When wired to a ZVC controller, the endswitch to the boiler won't close until there is a thermostat call AND the Zone Sentry endswitch closes.
@ January 9, 2014 8:38 AM in Taco Zone Controller and Universal Timer Card? What is needed?Taco has recently updated all of the zone controllers. In the past you were able to add in the PC-610. However, the new -4 controllers eliminated all of the add-on cards and instead added all the capability of the cards to the board themselves.
So to achieve what you need, you just need to make sure if you add the ZVC controller, wire in the zone valves and circulator.
Here are the options you have for cycling the ZV and circ
Pump Exercise Operation:When the dip switch is set to ON, the solid
state timer cycles all the zone valves and circulating pumps that are
attached to the Expandable Zone Valve Control at the selected time
interval. The time interval can be set for the valves and pumps to run
for either 30 seconds every 2 weeks or for 4 minutes every 24 hours.
Here is a link to the ZVC http://www.taco-hvac.com/en/products/Enhanced%20Zone%20Valve%20Controls/products.html?current_category=411#
@ January 7, 2014 2:18 PM in Life Expectancy of VDTAs Alan said, it depends and there are too many variables as to why a component may fail.
With that being said, the 00-VDT has been around for about 10 years already. It is based upon existing 00 circulator design. The only thing different between the two is the on-board controller and the sensors.
If needed, is can be repaired using standard replacement parts from 00's.
@ January 7, 2014 10:07 AM in under cabinet heatingOr even slightly under the cabinets. Don't keep the tube too far away from the cabinets because people stand nice and close and like Gordy said, a little under the cabinet where the plumbing is never hurts.
I have always taken the amount of cabinetry out of the square foot calculation of usable heat emitter. It will also lower the amount of tubing/plates/....needed for the project.
Now when it comes to bathrooms, try to get as much tube in there as possible, under tub decks, showers pans, shower walls. It is typically the only place of the house where you are wet and nekkid at the same time.
@ January 7, 2014 10:02 AM in taco fuel mizerDeep thermostat setback and an outdoor reset controlling the supply water temperature to the heat emitters can make homeowners think something's not working.
The response time to get the house warm again can take longer especially when you hit a cold snap like this one (45 degrees during the day, 5 that night).
Glad all is OK
@ December 30, 2013 10:24 AM in Stoppage in a radiant floor lineIs this loop a long loop compared to the others and maybe is the heat loss to this particular area higher than the rest.
Could also be the circulator size?
Manifolds should be balanced based upon the gpm needed which is calculated by the heat loss of the space. Then size the circ accordingly.
@ December 17, 2013 3:40 PM in Insufficient heat from systemis just for the zone, if the circulator needs to pump other devices, then the associated head loss must be added.
I couldn't get a clear picture of the piping to see the pump and piping
@ December 17, 2013 11:36 AM in Thought I knew what I was doing.I am assuming that the thermostat is located in the original radiant room.
So when that thermostat gets satisfied, it shuts down the system.
The heat loss for the porch area is much higher and therfore needs a higher flow rate. So balancing the manifold based upon all having the same flow is causing the porch to be colder.
You can add a zone by adding actuators to the manifold and a thermostat in the porch
@ December 17, 2013 11:14 AM in Insufficient heat from systemDid some quick math based upon what is installed.
I found that you need about 2.2 gpm (based upon 39 feet of baseboard at 550 btu's/foot)
The pressure drop of 3/4" pex and 25 elbows and running at 140 degrees comes to about 12.4 foot of head.
So, a 007 is too small of a circulator
The 0015 on speed 1 is perfect, of course if we are estimating some of this info, speed 2 may be better if we are under estimated.
I don't think changing the size of the pex will change much or eliminating elbows.
@ December 16, 2013 10:13 AM in Taco wiring questionCraig,
24 volt power from a transformer can be higher than expected. You are OK.
Glad everything is working well
@ December 11, 2013 6:00 PM in Keeping circulators always on in unattended home to prevent freeze damageWhy not go with an internet based thermostat?
You can see the temp in the house when you are away and depending upon the stat, they can grab the local weather data to see how cold it is outside.
Other than that, antifreeze should be added if freezing conditions exist inside too often.
@ 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.