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Jamie Hall

Jamie Hall

Joined on September 16, 2002

Last Post on August 31, 2014

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Leave all the factory wired

@ June 29, 2014 11:33 AM in need electrical help

24 volt stuff alone.  As has been noted, warranty issues.  However, that doesn't prevent you from putting anything you want into the 120 volt feed to the unit from the switch box!  So... you have your regular cutoff switch somewhere, then in series to your new second LWCO, then in series to the second pressuretrol, power the automatic water feeder off all that if you like, then -- finally! -- to the power input to the boiler.

I'm paranoid

@ June 27, 2014 10:03 PM in need electrical help

and I don't want any chance of something turning a system on which a safety has turned off.  I want power removed from that puppy until I find out what's wrong.

In most cases

@ June 27, 2014 8:09 PM in need electrical help

(check the ratrings!) the best way to wire safeties is in series with the 120 volt feed to the boiler controls.  On the hot side of the 120 volt (never, ever, put a switch of any kind in either the ground or the neutral!).

Um... err... starting where?

@ June 25, 2014 8:03 PM in need electrical help

And what kind of boilers?  Steam?  Hot water?  What controls?

Honestly, if you are not reasonably current (sorry) on electrical work, it might be better to get a licensed electrician in to do the wiring, at least to the point of getting power, properly wired, switched and with proper circuit protection (and, if code requires, or you are so inclined, fire protection), to the boilers.

With two boilers the controls can get a little complicated, depending on exactly what you want them to do when.  Nothing impossible, but it isn't always obvious how to wire them.

As has been said in the other thread...

@ June 24, 2014 11:25 AM in New Geo System vs. Old Steam System System

(by the way -- thank you  for splitting the threads!) -- get Dave on this.  Usually in a steam system the only things that leak -- and they do leak, sometimes -- are wet returns.  Steam pipes themselves almost never leak, nor do dry returns (note:  I said "almost never").  Having pinhole leaks which blow steam suggests very strongly that you may have some failed traps, allowing steam into the returns -- and you may be running the pressure much too high.

Dave can evaluate both of these problems very quickly (and he really is one of the real top end experts), and neither should be particularly difficult or expensive to fix.

I like the idea of ice storage for the air conditioning.

Two comments...

@ June 23, 2014 9:06 PM in Need help rating these radiators.

First, as several folks have said, save yourself and your church a whole pile of money and get Dave over to refurbish the steam system for your heating needs.  Then add just enough air conditioning capacity to keep folks happy in the summertime.

Second, though, if your congregation is bent on appearing greeny (they won't be; refurbishing the steam system is actually a lot greener) and ripping out the whole existing system and getting the geothermal, you need to have someone -- might be one of the contractors, but better would be a well-qualified HVAC engineer to determine the actual required heating and cooling loads, including allowances for capacity for rapid recovery for services.  Granted, the existing system may give you a sort of a ball park figure, but that's not adequate for what you need at this point.

That's a house trap

@ June 23, 2014 8:54 PM in Trap on 4" sewer main in basement

and they weren't that uncommon at one time (the place I care for has two of them on the main building).  They are or were required by code in some jurisdictions.

The whole idea behind the thing is to prevent sewer gasses from entering the house plumbing.  They really aren't needed (unless your code says they are!) if all the rest of the traps in the house are properly vented, and if there are any floor drains or such like (including seldom used bathrooms!)  that arrangements are available to keep them wet.  On the other hand, they won't hurt anything... until they clog up.

They should be vented, however, just like any other trap.  If they are outside, there would be a vent also outside.  If they are inside, they may be vented through the rest of the plumbing (although that means that they are running traps which aren't really that great to have), but I have seen some vented with a short vent going to a grille in the foundation...

A few more thoughts...

@ June 16, 2014 3:19 PM in Calculate btus for OIl and Gas steam

First off, the size of the steam boiler required is determined by the installed radiation, not -- repeat, NOT -- by the heat loss of the structure.

Now if you change the amount of radiation, basing it on a conservative estimate of the heat loss in each room, then you can add up the installed radiation area (termed EDR) and determine the boiler size based on that.

On the other hand, if you keep the installed radiation -- which I would recommend, unless you are doing a pretty drastic remodel -- just add up the EDR of the existing radiation, and there is your boiler size.

Really simple.

But to repeat: the boiler size for steam has nothing whatsoever to do with the heat loss of the house!  The installed radiation may -- you can size that to heat loss -- but the boiler must be sized to the installed radiation.

It doesn't matter whether the fuel is oil or gas.  A BTU is a BTU, and an EDR rating is an EDR rating.  Which fuel you use is a matter of preference and cost and availability.

Now converting to hot water... we generally do not recommend doing so; there are just too many ways to get into varying amounts of trouble ranging from relatively mild pains in the pocketbook to truly catastrophic.  There is no good reason to do so; a good steam system, properly adjusted, will be within a few percentage points of an equally well adjusted high efficiency hydronic system, and it is unlikely -- at best -- if you would ever recover the additional cost (which could be very large indeed) in fuel savings..

However, if you were determined to do so, a BTU is still a BTU.  However, your installed radiation will not deliver the same BTUs on hot water as it will on steam.  On steam, the figure is 240 BTU/hr/square foot EDR rating.  On a high efficiency hot water system (trying to condense to get the efficiency), the figure will be about half that -- say 130 to 140 BTU/hr/square foot EDR rating.  Therefore you will need to evaluate the ability of your installed radiation to meet the heat load of the structure; then you could size the BTU rating of the boiler to suit.

For budgeting for the conversion, you would need to have the existing system evaluated pretty carefully, but for starters, assuming that the existing radiation is usable and doesn't leak at the higher pressures, you will need pretty much all new piping.

very nearly

@ June 14, 2014 8:35 AM in Expanion rate

10 microinches per inch per degree F temperature change.  Depends a little on the alloy.  


@ June 13, 2014 7:20 AM in Union installation on 2.5"

It dawned on me -- at 3:30 AM -- that that's the way to do it.  Cut out a whole section.  Play with it.  Unions (or flange pairs) at both ends.  Just slip it back in.

Do I turn in my license now, or later?

Can you take

@ June 12, 2014 7:05 PM in Union installation on 2.5"

enough hangers off to get the pipe ends moved laterally enough to thread something on?

What a nuisance...

@ June 12, 2014 2:19 PM in Union installation on 2.5"

but, stuff happens.  Instead of making the final connection with a union, use a pair of flanges.  Cut the section out then proceed as you said at first -- nipple, T, nipple -- but on the end of that nipple screw on a flange, and thread and screw a flange on the cut end of the pipe.

Are you not able to drill and tap into the top of the pipe for the vent?  Is that why you need a T there?

The place I care for

@ June 11, 2014 10:24 PM in What are the implications of reducing radiator count on a one pipe steam system

has a long radiator made of two finned iron pipes under a big window seat -- the thing is 8 feet long, two pipes.  Approximate EDR 61.  It really works well.  The seat is at normal seating height and width.

Most likely

@ June 11, 2014 9:03 AM in Hoffman Boiler Feed, persistent trickle feed and overflow

that valve inside the tank.  The others just prevent backflow and reduce pressure, but don't turn the feed on and off.


@ June 10, 2014 8:33 PM in Hoffman Boiler Feed, persistent trickle feed and overflow

there is a shutoff valve in the mechanism -- not the pressure reducing valve, nor the backflow preventer.  It's that valve which is leaking and needs repair.  Find it and you'll be good to go.

How about...

@ June 10, 2014 3:24 PM in Radiators

"both"!  For a useless answer.  Or... "it depends".  Not surprisingly, there is a fair amount of radiation -- you can feel it if you stand near a warm radiator.  However, I believe that the major part of the heat transfer is by convection -- although I'll be the first to admit that I've not seen a really scientific study on that.  Rather, my opinion -- for that is all it is -- iss based on two things.  First is the plain geometry question: radiation operates only by line of sight to a cooler object.  Second is the observation that we rate radiation -- quite successfully -- based on the total surface area of the radiator, not on the flat plate area (which would apply to radiation).  For instance, a 10 section, 5 tube radiator of more or less typical geometry has a flat plate area of about 6 square feet -- but an EDR ("equivalent direct radiation") of 50.  Third is that it is quite possible to put a radiator in an enclosure and, provided the enclosure permits circulation, get almost as much heat out of it as if it were in the centre of the room.  Fourth is that you can put a radiator behind a couch (not touching!) and the room still is warmed -- but not that much the couch.

Now hopefully someone will come up with a genuine lab. study!

As I noted in my first reply

@ June 10, 2014 10:22 AM in Boiler replaced - Boiler trap removed

I think you are looking at a system which has had at least two stages of knuckleheads... if not more.

First off -- air vents of some kind, somewhere, are absolutely required.  In two pipe systems which have been "modified" over time, the easiest and most reliable approach to venting is good big vents at the ends of the steam mains and another set at the ends of the dry returns, just before they head down to the boiler.  The objective of the steam main vents is to allow steam to move rapidly to the ends of the mains, thus allowing all the radiation to start heating uniformly.  The objective of the vents at the ends of the dry returns is to allow the air leaving the radiators to go somewhere, and thus allow the steam into the radiators.

All this should happen at very low pressures -- a few ounces or so, maximum.

On residential systems, if is almost never necessary to have any kind of fancy gadget to get the return condensate back into the boiler -- assuming just one thing: that you have adequate (read: vaporstat) control of your pressure.  Gravity is astonishingly reliable, and all you need to do is give it a chance.  So yes; the ends of the dry returns should all drop down and join whatever wet returns you have before the wet return connects to the bottom of the Hartford Loop.

At this point it is worth wandering around in the basement and checking to see that all the wet returns are, in fact, wet -- that is, below the water level of the boiler.  Sometimes when boilers are replaced the water level is lowered, which can dry out some of the wet returns, with lamentable results.

The comment on the fancy gadget arises because in older, coal fired systems, there often was a fancy gadget at the ends of the dry returns (or sometimes elsewhere) to ensure that if and when the pressure rose to high that the condensate could get back to the boiler while at the same time still allowing air to escape.  They were needed because it was harder to control the pressure in a coal fired boiler; they don't turn off quite as neatly as oil or gas burners do.  There is no reason to take them off, however, if they are there -- but equally no reason to put them back on if they aren't.

Again, though, use a vapourstat for control!

As others have noted, the near boiler piping does leave something to be desired...

In response to direct questions: no, no check valves are needed.  Gravity will do the job.  At one time, there was some means for venting this system, which has been taken away.  The boiler return trap is not needed.  The two dry returns drop to the wet return before the Hartford Loop.

And, if you haven't already bought it, I highly recommend buying at least "The Lost Art of Steam Heating" available on this site.

That one's been around

@ June 9, 2014 9:17 PM in Two Pipe Steam System with Air Vents

for awhile.  But it's described in The Lost Art, of which I hope you have a copy.  What makes it a bit strange is the water seal in the "outlet" side of the "2 pipe" radiators (I like to think of them as 1 1/2 pipe...).

You have a really critical dimension here: the height from the steam main, where those returns tie in, in relation to the radiator.  On first thoughts (it's late at night...) you may have difficulties if that distance is less than about 28 inches for each pound of steam pressure.

I'll have to think about this one some more.  Meantime, go look it up in Lost Art...


@ June 9, 2014 9:12 PM in steam in the summer!

you are drawing hot water from your tank faster than your boiler is capable of making it.  Therefore the aquastat on the tank keeps calling for heat.  What is needed is a control on the boiler itself to shut it off when the boiler water reaches a reasonable high temperature, assuming that the thermostat isn't calling for heat.

Either that control is missing, or not set properly.

It's worth noting that you also have a capacity problem here -- you are drawing hot water faster than your system can make it.  Get the one problem fixed, and you may discover that you don't have enough hot water...

Is this thing

@ June 9, 2014 7:13 PM in steam in the summer!

set up as an indirect with circulation?  That is, is there a circulator taking hot water from the boiler, running it through a heat exchanger in the tank, and back to the boiler?  If so, something is amiss with the control on that circulator -- it should only run when the tank needs heat -- and there should also be an aquastat on that line, which turns the boiler's burner off when the circulating water is hot enough -- say 160 or so.

Or... is the tank simply storing hot water which is being created by the a domestic hot water coil in the boiler?  If so, again there should be an aquastat on the system which shuts the boiler off when the boiler water is hot enough.

Or at least that' the way I'd have it set up...

But it's basically a control problem.

You are indeed fortunate

@ June 8, 2014 7:33 PM in Steam Trap - Kelmac Jr. Retarder ?

to have that mercury vapourstat!  Those things are worth their weight in gold.  So long as they are levelled properly, they work really reliably -- for decades!

I don't think the bullhead T for the condensate returns is really going to be a problem.  Not ideal, perhaps, but not a problem -- the returns will be nowhere near full of water, after all.

I'd put two Gortons #2 on each steam main -- that will get the steam out to the end nice and fast and evenly.  Then I'd put one Gorton #2 on each of the returns if I could do it.  Otherwise, you could put one tap into the top of the T and then come off with a short 3/8" nipple, 3/8" T, and two short nipples and elbows going up to the vents -- sort of an antler.  That will work just as well.

Using the heat pump in the shoulder seasons is a good idea!

Sounds like you have

@ June 8, 2014 4:11 PM in Steam Trap - Kelmac Jr. Retarder ?

a pretty good plan there.  It will take some time to get the orifices "just right", but it's quite doable.

By abandoning traps, I presume that you will leave them -- empty or stuck open -- in place.  That will work fine with the orifices and low pressure.

You definitely want the vapourstat.  Without it it's pretty hopeless -- too much pressure.

On venting.  You will need main venting, and the more the merrier, on the steam mains.  It is possible, with care, to drill and tap 1918 black iron pipe.  It is a little chancier drilling and tapping 1918 fittings, as they are probably cast, and can shatter -- which is annoying.  However, a 3/8" nipple is fine for a Gorton #2.  You will also need to find a way to get vents -- again, the more the merrier, at the very least after the last radiator return into the dry returns.  At the boiler is better, but if not... anywhere after the last radiator return will do.  Without the steam main venting, yes you are depending on the air getting out of the mains via the orifices in the radiators, and that is going to be slow and uneven.
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