Security Seal Facebook Twitter GooglePlus Pinterest Newsletter Sign-up
The Wall


Joined on January 19, 2012

Last Post on July 25, 2014

Contact User

Recent Posts

« 1 ... 48 49 50 51 52 53 54 55 56 ... 80 »

The real question...

@ January 16, 2013 4:59 PM in High delta T, how to adjust it?

Can you help me fix my system without spending any money or disassembling anything? The simple answer is no.You cannot evaluate the condition of a circulator with an ampmeter. If it is partially corroded or the impeller is worn your test is meaningless.


@ January 15, 2013 10:48 PM in High delta T, how to adjust it?

Why is that ugly black 007 still attached to your boiler? Where do you live? I am coming over to change it.


@ January 15, 2013 10:35 AM in High delta T, how to adjust it?

It will take 4 bolts and 3 wires. Swap your circ for a grundfos 15-58. Open up all "balancing" valves and watch it go. You will have 3 speeds to play with and your delta T will be exactly what you want If you want to get real crazy put in a delta t circ.
Nice work with the 2 Walmarts. Hope they were superstores.

Gas line sizing?

@ January 15, 2013 10:24 AM in Rinnai tankless woes

Has anyone looked at you gas line sizing and pressure? All to often these are installed to replace tank hot water heaters with much lower BTU requirements. Everything works OK until other appliances on the line turn on. The gas pressure will then drop and cause an error.


@ January 14, 2013 11:13 AM in Short Cycle

I would look for a faulty t-stat. Maybe one with the anticipator incorrectly set.
I think you are going to have to catch it in the act.

Split it.

@ January 14, 2013 10:44 AM in gpm

You can run 2-3/4" lines. It is often practical to run a 1" line to the center of the house then split to  2-3/4" lines.
The other problem with piping 50K btu all in series, is that the radiators at the end will be starved and under perform.


@ January 13, 2013 7:22 PM in Air purging

Those thermo zone valves do delay a bit opening and closing.
It sounds like some of the air moved and is now locking your boiler. Are your air vents open? Most have little caps on top that need to be open. I would not operate your system in an airlocked condition. You could damage your circulators and your boiler.

Power purge

@ January 13, 2013 6:10 PM in Air purging

You need to power purge your system. The original installer likely installed an isolation valve and a couple of boiler drains for this purpose. This may be tricky without pics.

3 variables

@ January 13, 2013 5:49 PM in GPM

There are 3 variables
Delta T

If you have any 2 you can solve for the missing 1.

If you are trying to find the GPM without the delta t or the btu/hours, you will have to either:

Calculate the size and length of the pipe and fittings and compare this system curve to the pump curve.

Measure the pressure differential on either side of the circulator and compare that to the pump curve.

Taco's flow pro university has some great webinars. John Barba is a fine teacher.


Not the best...

@ January 13, 2013 5:39 PM in Trimax / DHW question

Disabling the DHW circ will not make the call go away. The boiler will still try to heat the tank.
I think you would be better off with your original plan without the sensor.
Tekmar does a nice job with this. You can put the entire system including t-stats in an away mode.
Given the low heat loss in the smart tank, I would be inclined to leave it on. Be sure to insulate the pipes and provide heat traps on the lines to prevent migration.


Remove the circ...

@ January 13, 2013 1:13 PM in High delta T, how to adjust it?

I think you need to remove and inspect the circulator. It is the most likely culprit of your problem.
The 007 is likely the correct size. I do not believe you can size circulators accurately by first guessing at the length of pipe then guessing at the head/ft per 100. The 6 per 100 number is based on pipes at max flow. The 1" in this scenario will see 5 gpm the 3/4" won't see more than 3 gpm. Sure a 0012 will heat the house and you won't get a call back. It will be oversized.
If you replace with a 3 speed circ you can adjust the speed to get the desired delta T.
You could always take ME's offer to accurately size your circulator. With that you would be guaranteed success.
I mean no disrespect to the folks helping on this one.
This post has veered way of course.


@ January 12, 2013 6:30 PM in Radiant floor heat source using GeoSpring hybrid water heater ...anyone doing this?

The heatspring does not have anything mounted on the outside of the building, Yes?
That leaves 2 options;
It is pulling the heat from the air in the house.
It is running on magic.
It is a heat pump. Where is the heat coming from?

The heat comes from the house.

@ January 12, 2013 1:52 PM in Radiant floor heat source using GeoSpring hybrid water heater ...anyone doing this?

The geospring pulls energy from the air around the heater and puts it in the tank.
I don't see what you would be accomplishing.

No offense

@ January 12, 2013 9:54 AM in High delta T, how to adjust it?

I meant know offense by the Swag comment. I was using the acronym to mean Scientific wild ass guess. Given the information provided, I don't think it is a bad way to ballpark. I was familiar the .06 multiplier, I just had never seen the 3 before. I understand your logic.


@ January 12, 2013 9:40 AM in Help with ZVC404

Once the TT terminals on the Taco close , the controller will apply power across the zone 1,2 terminals to the zone valve. When the zone valve opens it closes the 3,4 terminals. Once this happens the dry switches on the bottom left will do their thing.
The only place you should be introducing power is the 120v to feed the controller and anything you want controlled by the 3 switches in the bottom left.

I would be surprised if you melted a t-stat at 24v. I would pull all the wires and test their voltage to ground.


Check the circ

@ January 11, 2013 6:10 PM in High delta T, how to adjust it?

I bet the circ is plugged up or not working at all. You could be gravity feeding 60 delta T. A 007 does not sound that far off for your installation.


@ January 11, 2013 12:18 PM in Help with ZVC404

It sound like you have 120 volt where it doesn't belong. You may have competing transformers on different phases.
The boiler TT should be wired to the main end switch terminals.
The t-stats to the TT on the taco.
All four wires of the zone valves go to the corresponding 1234 terminals.
The only line voltage should be to power up the control or on isolated switches on the bottom left.


@ January 10, 2013 11:08 PM in High delta T, how to adjust it?

The 3 is SWAG, yes?

How in the world...

@ January 10, 2013 11:05 PM in High delta T, how to adjust it?

How do you figure head loss with no piping lengths? You lost me!

how much...

@ January 10, 2013 10:47 PM in High delta T, how to adjust it?

How much piping is there in the loop?
What size is the boiler?
Are there other zones?


@ January 10, 2013 4:48 PM in Design opinions...

The payback on PV is essentially never. Check out the pvwatts calculator on the doe site. The last one I did worked out to 17 years. By the time you figure in the degradation of the panels and the cost to relocate when you inevitably have to reroof it just doesn't work.

If you are seeing -30 temps air to air heat pumps are out.

I think you are on the right track with super insulating. I also see a boiler as having a decent payback over electric. Check out this calculator from doe



@ January 10, 2013 12:09 AM in Misc questions on radiant

How important is AC? If you just need a few rooms for a few months a year, it would be easier to make it a stand alone system. Radiant cooling is possible. It is a fairly complex system to install and control.

I would keep it simple. Radiant heating on all floors with a mod/con boiler for sure. As SWEI mentioned, thermal mass is not always your friend. If it was my house, I would be looking at a  low mass low temp system. The upper levels would be joist track attached to the bottom of the plywood. In the basement level, I would take a hard look at low temp radiant panel heaters.This type of system will respond quickly and provide the greatest comfort.

I would find a contractor/designer that understands how to do a heatloss calculation and install a simple and efficient system.

I have had my suspicions about the hippies on this site for quite some time.It is good to learn I am not alone.

« 1 ... 48 49 50 51 52 53 54 55 56 ... 80 »