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SWEI

SWEI

Joined on November 26, 2011

Last Post on April 19, 2014

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who else

@ February 4, 2013 6:58 PM in AQUATHERM

Nobody else with all the NSF ratings and code approvals here that I know of.  The socket fusion is actually a DIN standard, so it's compatible with a number of industrial PP systems.  Asahi PP ball valves weld right up to it.

valves & transitions do get pricey

@ February 4, 2013 6:55 PM in AQUATHERM

So I try to put valves at transition points whenever I can.

My standard recipe is to weld a male NPT fusion outlet on a trunk line, then thread a Webstone Ball Drain onto it.  Thread a male PEX adapter into the other end of the Ball Drain.

The fusion outlets really make the system IMO.

flow and BTUs

@ February 4, 2013 2:13 PM in Understanding Primary/Secondary Piping -ModCon

Sorry - got confused as to which boiler you were referring.

TT specifies a 4 GPM minimum flow for the CC85 _at full input_ which means the boiler is delivering 75,000 BTU/hr. That results in a 37.5F ∆T.  As the boiler modulates down, the required flow goes down proportionally.

The Cadet manual shows 2.1 GPM at its maximum output of 32,000 BTU/hr.  Less BTUs = less GPM needed.

4 GPM

@ February 4, 2013 12:56 PM in Understanding Primary/Secondary Piping -ModCon

at 32,000 BTU/hr is only 16F ∆T.

I assume we're talking about the Cadet CDN040 here?  p.38 of the install manual shows 2.1 GPM for 35F ∆T, which is what I'd design for.

flows

@ February 4, 2013 12:19 PM in Understanding Primary/Secondary Piping -ModCon

The flow of heat must remain equal on both sides.  The flow of water can change based on ∆T in each loop.  So for a load of 32k, the boiler loop might run 2.13 GPM at 30F ∆T while the distribution loop ran 6.4 GPM at a 10F ∆T.

run the numbers

@ February 4, 2013 10:49 AM in Sizing an Indirect Water Heater

Something like http://rightspec.bradfordwhite.com/Sizing/Residential.aspx will tell you the answer.

just curious

@ February 4, 2013 10:40 AM in Triangle tube prestige mod con?

If the building loss is 145k, but these coils need 90K, what provides the other 55k and where does it go?

Each coil is rated at 55k -- how is the "under 90k" allocated between them?

I snipped the image below from a FirstCo data sheet.  I can't find a cite, but I'm guessing they assume a 20F ∆T.  If you increase that to 30F, it will drop the average temp by 5F but should allow 3/4" PEX to squeak by (especially if the upper floor has the lower loss.)

I was proposing a rather simple change

@ February 4, 2013 1:09 AM in Making Heating System use less oil

replacing an oil burner with a gas gun, keeping the existing wet-base boiler.

As a first step.

400 gallons per day

@ February 4, 2013 1:07 AM in Will an indirect work for me?

of water, gotcha.  Indirect will be great.

Get a proper demand calc done, and consider gifting your tenants with new showerheads.  Seriously.

arbitrage

@ February 4, 2013 12:59 AM in Infloor Radiant Heat issue

If this were by my place, I'd really want to know why it required so much energy for me not to be there.  The answer might well cause me to rethink ownership.

If I could get a 50+% reduction per kWH via some token LPG implementation I would probably take advantage of it.  But not before understanding that first question.

hydraulic separation

@ February 4, 2013 12:46 AM in Primary/secondary piping

http://www.caleffi.us/en_US/caleffi/Details/Magazines/pdf/idronics_1_us.pdf does a very good job of explaining.

two points for creativity

@ February 3, 2013 9:11 PM in How to test

Never in a million years would I have thought of mounting a terminal block on a gas line.

agreed, but

@ February 3, 2013 12:37 PM in Making Heating System use less oil

if NG is available, the cost delta per BTU is hard to ignore (or overcome, for that matter.)

Tankless WH as booster

@ February 3, 2013 12:24 PM in Tankless WH as booster

Years ago, there was one particular Aquastar model that ended up in a lot of solar installs, since it worked well with preheated water.

Looking through I&M manuals for current tankless offerings I don't see any mention of minimum rise or maximum inlet temp.  Anyone have specifics, or a pointer?

thanks~

spill switches

@ February 3, 2013 11:26 AM in Burnham V-73 Steamer Goes Gas

always done in pairs?  Do they get wired to separate safety strings?  Just curious...

mod/con with baseboard

@ February 3, 2013 10:57 AM in Boiler upgrade

Will work just great - once you adjust the reset curve properly your thermostat becomes a high limit control and should not shut the boiler off unless you have heat gain from some other source (wood stove, solar gain, etc.)  Consider using a smart circulator, which will reduce the electrical consumption by about 75% over a conventional circulator.

Proper sizing of an indirect DHW heater will cure the cold shower problem.

full modulation is available

@ February 3, 2013 10:39 AM in Another Look at Vapor Vacuum

http://www.midcointernational.com/products/low_nox/ is basically a mod/con burner head setup for a conventional boiler.

turn down rate

@ February 2, 2013 11:04 PM in Smallest Indirect?

I have been told that somewhere south of 5:1 burner efficiencies tend to suffer.  TT limits some of their minimum firing rates in order have one controller for the entire line (and a single spares kit which covers everything up to 250 MBTU/hr.)

direct or not?

@ February 2, 2013 10:56 PM in Triangle tube prestige mod con?

One of the things I really like about these low loss firetube heat exchangers is that they tolerate a range of piping layouts.  With properly sized emitters, they can be direct pumped at high delta-T to maximum efficiency.  They work as drop-in replacements for conventional boilers of almost any age.  They also serve as key components in cutting edge complex systems.

I really wish that

@ February 2, 2013 10:00 PM in Smallest Indirect?

Triangle Tube would offer the Excellence in a 60k version here.   The internal 14 gallon indirect is a perfect fit for a small house, but the 110k firing rate is just off the charts for that size dwelling.

physics

@ February 2, 2013 9:33 PM in Understanding Primary/Secondary Piping -ModCon

will intervene in that fantasy.  Any thing you do which pulls BTUs out of the boiler will deliver those BTUs someplace.  If there is no buffer tank, they will flow into the space.  The space will overheat.  If a thermostat turns the boiler off, it short-cycles.

Most of the magic of a mod/con boiler comes from modulation.  When you oversize them, they can't modulate very well.

TWO separate CO detectors

@ February 2, 2013 8:36 PM in cleaning my burners

If they are typical UL 2034 alarms, they will not tell you much.  Even a quality electrochemical monitor will say nothing as long as the boiler has sufficient draft to keep the room negative.
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