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Joined on February 23, 2005

Last Post on June 20, 2014

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Air flow

@ June 20, 2014 11:57 PM in txv issue

it may not be a refrigeration problem. You need to check the air flow across the evaporator-400-450 cfm/ton. should be a 20 deg TD depending on the load and humidity.

sounds like the txv is working  but closing down due to low air flow. A cold liquid line=high sub cooing restricted or overcharged. low air flow, dirty filters, plugged coil, slipping belt dampers in ducts closed down undersized ducts????


@ June 20, 2014 11:35 PM in Hydrotherm KN-10 Boiler

Supposed to be a good boiler. never installed any but people that have liked them. I think they have a minimum flow requirement that other big condensers do not have though


@ June 20, 2014 11:28 PM in Aquatherm piping

We did a whole school with it. Good stuff but not cheap. Getting fittings is always a problem. We did a few smaller jobs with it as well. We did everything up to 6". Over 2" is tough you need expensive tools to buy or you can rent them.
There's a company in Baltimore that stocks all the fittings (Yates?) I think is there name.
Hangers, hangers, hangers. the stuff is not self supporting. Your supposed to use plastic lined hangers and lots of them. The hanger spacing is in there book based on temperature and pipe size your hanging every 4, 5 or 6 feet in some cases.
getting the giant machine up in the air to fuse is a real problem on anything bigger than 4". We used some electro fusion couplings (pricey). Up to 4" is not as bad. The big machine is the way to go if you do a lot of it. they do have a jig to use on 2 1/2-4" to pull it together buti t's a PITA.
Watch out when estimating a 6" joint takes a long time to heat and the cool down time before you can take the fitting out of the machine is about 25 min. Meanwhile your stuck not being able to use the machine while it's cooling.


@ March 7, 2014 6:56 PM in Steam traps?

If you go on the Mepco/DB web site you can find the rep in your area. We bought some of their vacuum pumps last year from a rep in NY


@ March 4, 2014 9:35 PM in Carlin Gas Conversion or new oil tank?

I would do the oil tank if it was my house base on your timeline.
The boiler is pretty old you could convert it to gas and then use the conversion burner over if the boiler failed if you decide to stay.

Pumps in parallel double the flow??????

@ March 4, 2014 9:28 PM in Unequal circulators in series

I don't think so. When the 2d pump is brought on the flow will increase but so will the head on both pumps so the original pump has its flow reduced by the rising head. If their the same pumps they should pump equally but not at double the flow of one pump.

Remodel has it right


@ February 28, 2014 7:18 PM in Low pressure steam, but long burner cycle

As the others said if it's heating the house it's probably ok. Do you have to add much water? How often? That could indicate a leak.

It,s possible you need a little increase in the firing rate but longer cycles make for smoother operation as long as fuel consumption is normal for the house I would probably leave it as is.

Pressure control

@ February 28, 2014 7:08 PM in Pressuretrol Issue

I wouldn't recommend screwing around with a pressure control put on the 4 lb vapor stat. Keep the PA404A as a back up safety limit.

You shouldn't be screwing around with a limit control, that's a safety control. If you cant adjust it to control as you want (and you wont be able to with a PA404A) Replace it or keep it as a limit.

pick up

@ February 28, 2014 6:59 PM in Pickup factor. Help me understand

Steam cycles up and down (at least in a house job)
 Every time the boiler shuts down the steam is condensed back into water very quickly. The radiation will stay hot for a while. The piping with not as much mass doesn't hold the heat as well.
When the boiler starts again it has to reheat the piping again. Some of the steam is condensed back into water without getting to the radiation so it does no useful work other than reheat the pipe (which is the pick-up)
Jamie's example of a car accelerating is spot on.

You are correct in that the pick up factor is seen as somewhat antiquated by some.
No doubt we need to have a pick-up factor. 1.33 may be overkill for some jobs but needed on other jobs.
 It's a judgment call. Will the boiler ever have to pick up the piping and a cold house at the same time??

After burn

@ February 27, 2014 9:23 PM in Could this be Steam Boiler or the Oil Burner's problem?

The flame should go out immediately when the burner shuts down. He changed the pump which controls the shut off pressure which could have been causing an after drip or after burn
(I am assuming the burner does not have a solenoid valve)
If your still getting an after drip or after burn you need a new service tech. Wrong nozzle, wrong spray angle or burner gun assembly pulled back to far or not properly set would be my guess.

gas pressure

@ February 22, 2014 8:51 PM in Clocking My CGi

I would trust the gas meter. Believe me, the Gas Co doesn't give away free gas. Your gas pressure is probably off a smidge. Your firing the boiler at about 93% capacity so your output is roughly 105,000.

If you had the instruments you could get the boiler efficiency but what you are doing will give you accurate results. You could double check it by doing a heat loss of your house but I feel you are in the ballpark.
If you go mod-con the boiler will modulate to match the load just have to be in the range of the boiler you need.


@ February 20, 2014 9:22 PM in How to get a oil burner installers lisence NYC

I don't know anything about NYC but most jurisdictions will:
Check your qualifications
If you qualify.. let you apply to take the test
if you can prove you have an equivalent out of state license.

that's how I got my CT.    E1 Master electrician and S1 Heating cooling Contractor. I was licensed in MA. first.

probably a combination of

@ February 20, 2014 9:12 PM in Not Enough Radiation?

not enough, radiation, insulation etc. Also Ice has a point about the space between the convector and the inside walls of the enclosure it looks like their may be to much space. the enclosures should be insulated and metal lined.
having the opening on top is better for the stack effect than in the front. is the return air inlet far enough below the convector inlet?
Also the enclosure grills (expanded metal) try removing them inlet and outlet and see if it improves the heat. They may have openings that are too small.


@ February 19, 2014 8:04 PM in friction loss

At 50 gpm I came up with 4.66 ft of head/100 ft for 2" pipe.

After converting the fitting footage to ft of pipe the total equivalent feet came out to 919 ft including the 710 feet of pipe.
919 ft @ 4.66/100 ft =42.8' of head. the fitting chart I had showed 8.5 equivalent feet for a 2" screwed 90. This seems high to me.

What do you guys show for a 2" screwed 90?

repair till spring. Hurry up spring!!!!!!!!!!

@ February 15, 2014 9:22 AM in Steam return pipe leak

A pipe repair clamp that bolts around the pipe with a red rubber gasket will hold out till spring.
You could also use a couple of gear clamps (hose clamps) to hold the gasket.
Spring 6 weeks to go!!!!!!!!!!!!!!!!!!!!!

server room

@ February 14, 2014 7:55 PM in Heat gain in computer server room

Typical comfort cooling load is approx. 80% sensible and 20% latent heat. Not so In a server room the biggest load is the equipment which is entirely sensible load. As a result the equipment has no problem running enough to remove the humidity. If anything the room may be to dry and humidity will need to be added.
We have a ton of small server rooms in our area and the small ones are typically done with ductless splits.


@ February 12, 2014 8:50 PM in Heat gain in computer server room

It will be fine. I think your electrical load is accurate. You have some room for future expansion.


@ February 8, 2014 8:51 PM in questions to ask for new boiler quote?

a QUALIFIED heating contractor can do this. 


@ February 8, 2014 8:29 PM in I don't like my new boiler! oh no

Well that would suck having to replace it.
Was the burner set up properly with combustion test instruments?
A smaller nozzle and down firing may help if approved with the boiler/burner you have. 
Yes, you could enclose the boiler in a room and soundproof it. Don't forget to have provisions for combustion air and maybe ventilation


@ February 8, 2014 10:16 AM in old furnace gas conversion

No brainer. Not worth the conversion. Toss it out and put in a new condensing furnace


@ February 7, 2014 6:59 PM in Universal Brick Steam Oven

never worked on one. I would think poor combustion and mixing at the burner head could be a problem with all that draft and not much air down the blast tube.

Also I would think poor ignition, maybe that's why the Z dimension was messed with. Again not much air down the tube. Can the draft be reduced?
just guessing.......not much help

Brazed plate

@ February 7, 2014 6:45 PM in Modine HW Unit in Garage

Brazed plate hx is pretty cheap. Glycol it and a small expansion tank. Then you don't have to worry. you want to be able to go on vacation and not worry about it.
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