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Joined on January 19, 2012

Last Post on August 3, 2014

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OK but

@ October 16, 2013 12:03 AM in is it true

does a properly operating furnace create dangerous levels of CO if they were somehow vented into the living space.

is it true

@ October 15, 2013 8:18 PM in is it true

that carbon monoxide is only formed from incomplete combustion.  almost everything that I have read online says that this is so. Even the name implies this. Monoxide, lacking the oxygen atom that would normaly be a bibroduct of combustion as carbon dioxide. But many people in the field for a long time insist that if you drill a hole in a furnace heat exchanger (excluding other problems this would create) you will for sure get CO in the house. Thanks, Michael.

i meant

@ October 7, 2013 5:36 PM in refrigerent traps and subcooling

trap not strap

whats the difference

@ October 7, 2013 5:35 PM in refrigerent traps and subcooling

in function of a regular trap vs an inverted strap. Thanks Mike

refrigerent traps and subcooling

@ October 6, 2013 1:00 PM in refrigerent traps and subcooling

what is the function of an inverted suction trap on a system where the condenser is above the evap. And in a refrigeration system with a txv/receiver where does one measure subcooling. Thanks, Michael.


@ October 6, 2013 12:43 PM in noisy belt driven Air Handler

its been a long time but thank you for the responses. I changed the pulley on the motor and they have not called back.

noisy belt driven Air Handler

@ September 2, 2013 11:37 PM in noisy belt driven Air Handler

Hello to all.
 I recently changed a blower motor (1/3 hp) that uses a belt to drive the blower on an old 3 ton air handler that customer states had started to make squeeking type of noises before it died. I replaced the motor and belt and about three weeks later it was making a constant high pitch noise worse than before, not sure where its coming from. I adjusted the pully on the motor to be more in line with the pully of the blower and for the remainder of the time I was there it was fine but it started again soon after that. Now it starts with a constant cycle of humming and then squeeking and again humming then squeeking.
Other important things I noticed are
1)If I remember correctly when I removed the cover the noise stopped
2) The new belt after 3 weeks seemed to have been a lot looser then when first installed.
3)Noise only happens with belt in place
4) blower has pillow type bearings that seem to be properly greased.
Any help would be greatly appreciated, Michael

Finished Attic Heat Gain

@ April 18, 2013 12:46 PM in Finished Attic Heat Gain

Hello to all!
I need to figure out the heat gain for a room in a finished attic (R-11/dark roof). My understanding is that without a "proper" vented attic above, these rooms can get very hot.  Manual J  has "Roof-Ceiling Combination", but the HTM is less than "Ceiling under vented attic". Any help would be appreciated.


@ February 18, 2013 6:14 PM in how much BTU does a person give off

Thanks again, Michael


@ February 18, 2013 6:14 PM in how much BTU does a person give off

Thanks again, Michael


@ February 17, 2013 1:23 PM in how much BTU does a person give off

Dr. Silberstein. I am actually looking for an accurate number. I need to do a heat load calculation for a house of worship and need to be precise.
Thanks agian, Michael.


@ February 16, 2013 8:14 PM in how much BTU does a person give off

thanks swei

how much BTU does a person give off

@ February 15, 2013 5:07 PM in how much BTU does a person give off

Hello to all
How much cooling BTU (both sensible and latent) do you need the heat given off by a person?
Thanks, Michael.

heel tee

@ February 10, 2013 12:30 AM in hot water loop off steam boiler

gotcha thanks again

I lust finished

@ February 8, 2013 12:02 PM in hot water loop off steam boiler

reading link that dan included with his response, that answered my question about why the water stays up. But i still dont know what a heel tee is and why that caused boiler flooding.
Thanks again, Michael

jonny 88

@ February 8, 2013 11:54 AM in hot water loop off steam boiler

Thanks for the response, much appreciated.
You got me thinking with the example you gave, what does keep the water in the loop from pushing back into the boiler? What is a heel tee and why did that allow the water to flood the boiler?When you say gauge, you mean a temperature gauge?
Thanks for your time and advice, Michael.


@ February 7, 2013 8:26 PM in hot water loop off steam boiler

thanks again dan, much appreciated.

i thought

@ February 7, 2013 3:58 PM in heat load calculation-HELP

thats what it might be but was not sure. thanks

its a nice suprise

@ February 7, 2013 2:23 PM in hot water loop off steam boiler

to get a response directly from you dan. but whats "gravity circulation"? and whats blending. like i said i have read the book but am new to much of the concepts.
thanks, michael.

hot water loop off steam boiler

@ February 7, 2013 2:00 PM in hot water loop off steam boiler

hello to all
i have been in the trade for almost a decade but have only recently become exposed to the beauty of 'the lost art of steam heat'. why does the hot water loop need flow controls on supply and return? even when producing steam wont they both be at the same pressure and therefore have no flow. also, on one such loop there was a 3/4 inch pipe connecting the two flow controls, whats that for?
thanks for the help, michael

heat loss

@ February 7, 2013 1:39 PM in heat load calculation-HELP

thank you john. what is "studding"?


@ February 7, 2013 9:16 AM in bubbles in sight glass

Thanks for the response Mr Silberstein.
When you say that "this increases the flow rate in the liquid line" do you mean that the "extra" liquid leaving the liquid line through the txv causes a slight pressure drop in the line and causes flashing? Would i theoretically see bubbles in the entire liquid line as well?
Thanks, Michael.
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