Joined on January 19, 2012
Last Post on October 28, 2013
@ October 28, 2013 11:04 AM in Fresh AirI am installing a 45,000 BTU %80 furnace in a small mechanical room in a finished attic and would like to bring in fresh air for combustion. Is there a calculation to find out what size pipe I need? Thanks, Mike
@ October 17, 2013 10:20 AM in refrigerent traps and subcoolingfor the responses. pecmsg, but where do you take the actually the subcooling measurement. Also, you talk about a liquid seal. I understand that to mean, no matter where the outlet to the receiver is, you always have liquid leaving . If the outlet is on the bottom there is liquid there and if its on the top you have a dip tube into the liquid. So on a slightly undercharged system you should have enough liquid to maintain a liquid seal, why do you get bubbles in the sight glass? Thanks, Mike.
@ October 17, 2013 9:54 AM in is it trueBut I would think that there has to be a reason for that. I read that overfiring can also cause CO because you get incomplete combustion from the extra gas. Did you find any reason for the CO on the new unit? Thanks, Mike.
@ October 16, 2013 12:05 AM in is it trueput a CO tester at the outlet of the flue and had no reading.
@ October 16, 2013 12:03 AM in is it truedoes a properly operating furnace create dangerous levels of CO if they were somehow vented into the living space.
@ October 15, 2013 8:18 PM in is it truethat 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.
@ October 7, 2013 5:35 PM in refrigerent traps and subcoolingin function of a regular trap vs an inverted strap. Thanks Mike
@ October 6, 2013 1:00 PM in refrigerent traps and subcoolingwhat 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 Handlerits been a long time but thank you for the responses. I changed the pulley on the motor and they have not called back.
@ September 2, 2013 11:37 PM in noisy belt driven Air HandlerHello 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
@ April 18, 2013 12:46 PM in Finished Attic Heat GainHello 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 17, 2013 1:23 PM in how much BTU does a person give offDr. 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 15, 2013 5:07 PM in how much BTU does a person give offHello to all
How much cooling BTU (both sensible and latent) do you need the heat given off by a person?
@ February 8, 2013 12:02 PM in hot water loop off steam boilerreading 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
@ February 8, 2013 11:54 AM in hot water loop off steam boilerThanks 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 boilerthanks again dan, much appreciated.
@ February 7, 2013 3:58 PM in heat load calculation-HELPthats what it might be but was not sure. thanks