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Joined on November 26, 2011

Last Post on July 23, 2014

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More water, more better

@ May 31, 2014 1:26 AM in High Mass vs low massBoiler

as far as the boiler is concerned (in most cases.)  Those old gravity systems worked surprisingly well with a bang-bang boiler.  They positively rock when paired with a mod/con.

Also interested

@ May 30, 2014 12:28 PM in Water Towers

is this something Dan could post on the Wall?

Leaving out the math

@ May 30, 2014 12:26 PM in LP or Oil

Lower RPM engines wear out more slowly and make less noise.  4-pole alternators are bigger and heavier than their 2-pole counterparts.  You generally get what you pay for.

7500 BTU/hr

@ May 30, 2014 10:33 AM in Smallest wall mount mini split available???

is available from Daikin in some of their lines.

Your geothermal contractor

@ May 29, 2014 3:43 PM in Heat load calc( to pay, or not to pay)

should be fully capable of doing the heat loss calcs.  If he is not, I'd be wary...

Possible code issue

@ May 29, 2014 3:40 PM in Converting 277/1/60v heat pump to run on 230/1/60v ... ??

if the job is going to be inspected, assuming it is a residence.  Otherwise no real issues that I can see.

Fair dealing

@ May 29, 2014 3:20 PM in Top reasons for doing business with.

and reasonable stock are the biggies.  I really hate having to cross-check pricing on every order and after a couple of bad experiences there we are gone.  

You can sometimes pump the Cadet directly

@ May 29, 2014 3:01 PM in Time to pull the trigger

especially on a low load system.  Trust the math.

PEX expansion

@ May 29, 2014 2:57 PM in Tips for quieting down a staple up radiant floor?

is the same for barrier and non-barrier as far as I know.  If anything, the barrier would potentially inhibit some of the expansion -- can't see how it could add to it.

I'd install an HX with an ODR-controlled mixing valve on the floor loops.  You really want to modulate those temps -- not just for noise, but for comfort.

Why KBN?

@ May 29, 2014 2:48 PM in Utica vs Lochinvar

The WHN is a much better design.  There are other options as well.

Generators come in many flavors

@ May 29, 2014 2:43 PM in LP or Oil

Look for a water-cooled 1800 RPM engine if you want quiet.

Assuming the unit is sized correctly

@ May 29, 2014 12:08 PM in Converting 277/1/60v heat pump to run on 230/1/60v ... ??

and all of that, and that the price is good enough you don't mind having to explain to the service tech every time he arrives, you could install an autoformer to power it from 240V.   Unless there is sufficient space in the high voltage section of the cabinet, you will need to install an external enclosure for the autoformer (some come with one.)

Before or after

@ May 18, 2014 9:08 PM in Time to pull the trigger

is really your choice.  I use whichever works out best for the particular system layout.  Don't want to block access to the boiler, might get in the way of the lines to the indirect, etc.  You can even tee it off of the drain line, though I worry about sediment somehow ending up in the tank.

If you're an EE

@ May 18, 2014 1:07 PM in Issues with & Replacement of Honeywell L8148E Aquastat

You're certainly capable of measuring the output of your generator.  TIm McElwain has graciously provided some resources right here on the site

Combination hydraulic separator w/ air and dirt separation

@ May 18, 2014 12:44 PM in Time to pull the trigger

works great.  Just tee off from one of the cold legs near where they connect to the separator.  Don't forget a shutoff valve and a union so you can easily test or replace the expansion tank.

I thought you were posting another quiz

@ May 16, 2014 7:01 PM in What? How come?

In a three phase wye system, line to line voltage is equal to the √3 times the line to neutral voltage.

123V line to neutral times 1.732 = 213 V line to line.

Slight variations can be caused by nonlinear loading or the use of a DVM which does not measure true RMS AC.

3ø Wye System

@ May 15, 2014 11:40 PM in What? How come?

With a tad of imbalance (should be 213V L-L if all is well.)

Makeup water

@ May 14, 2014 11:49 PM in Does Onix Tubing oxygen barrier work?

If you shut off the automatic water feeder, how long does the system hold pressure?

Sounds about right

@ May 14, 2014 2:18 PM in Too big of a Buderus?

for an old house of that size with no envelope upgrades.

Higher water content in the boiler is a good thing, especially if the radiation is low mass.

One of our oil pros should be able to tell us how far can you safely downfire a 215-3.  Even at 30k, you'd still have the same recovery capacity as a standard gas-fired tank water heater.  Unless you have a huge soaker tub, I would not worry about DHW capacity.


@ May 13, 2014 2:31 PM in Rerouting water heat pipes for a new house

is the common name for baseboard-mounted low mass fin-tub convectors, e.g.
If instead you have heavy cast iron radiators, you actually have a lot more options for efficiency and comfort.

As far as the real estate market -- er, casino -- only a fool would claim to be able to predict prices the near to mid-term future.  Long term data indicates that the average price of a single family home tends to settle around 3 to 3.5 times the median income for any given area.  Caveat emptor.

If you can find a local pneumatic greybeard

@ May 13, 2014 2:19 PM in Pneumatic controlled univent

you should be able to resurrect the original control system.  If this is not an option, I'd suggest removing one of the actuators to see what kind of shaft they drive.  Plenty of options for retrofit electric actuators (which work with modern DDC systems.)  Where is this job located?

Don't forget

@ May 11, 2014 5:25 PM in Heat Loss discrepancy

to include window coverings, if you tend to use those in the middle of the night during winter.
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