Thanks much for the reply - I thought I was having an early senior moment.
Type: Posts; User: 7X
Thanks much for the reply - I thought I was having an early senior moment.
Ok - this seems silly but I need clarification. Been a long time since I worked on a boiler. I always understood that a hot water boiler had a pressure relief valve for overpressure conditions; an...
Maybe I should have specified heating or cooling only locations. I don't think a vapor barrier on either side of the wall is appropriate for both a heating and cooling climate as the wall may need...
I thought I was reading something from the technical pages of the Onion as I was going through this. "In these crawl spaces that have standing water after a heavy rain, the ground will never dry out...
I know this is an old post but I don't think the question was ever answered and somebody might benefit from this. From my perspective, you need to consider where the wall will dry to. Depending on...
There was only a brief mention earlier of sealing the ducts but it is probably the most important comment on the original post. Manufactured home/mobile home duct systems are notoriously leaky. Not...
Thank you Jim. I was not aware of this until today. Rudy was a great guy who would share anything he knew with no reservations. This is a shock - I will miss him. Tom Andrews
Heatingelement asked about the difference between "as-measured" and "air-free" CO. A really good guy gave me this analogy almost 25 years ago that I think works well. Like Rundawg said - perfect...
I know the original post was from last October, but for anyone else having a blower door test done...
About everyone doing residential blower door testing is doing a "one-point" test. The test...
There are some really educated people on this site and I appreciate the opportunity to learn. So please forgive me if I am being obtuse, but I am struggling with how pressure relationships in a...
I feel I need to stick my nose into this conversation one more time.
There will certainly be spillage in the scenario that HVAC_Mark suggested but the "unrealistic hypothetical" that Zmaniac...
If the SS1 didn't exist like Zmaniac stated, and it was still vented out the sidewall - the unit would be changing its category to a Cat 3, just like back in the day when we had Plexvent...etc and we...
The only reason the barometric damper is there is because of the Tjernlund power vent kit - if it was vented straight up like a normal CAT 1 unit, it wouldn't be there. The damper is required...
A Duct Blaster is a great tool for determination of duct leakage - if you are required to do it for some reason. And maybe one of those reasons is to check your work. The point I was making earlier...
Wild is all over this. I would add one thing from one of the .gov sites. It has been stated for years that you can potentially save 1% for every degree for every 8 hours of the set back. So,...
I have an Extech with a 9mm head - good resolution but not much good for more modern heat exhangers - I use if for a lot of other inspection stuff. Particularly difficult to get a good look at...
A Duct presurization/depressurization device can be a good tool depending on what you want to do with it. If you are working utility jobs that require duct leakage info or if you are testing new...
Don't touch the heat exhanger with the probe
I agree with the last posts regarding the returns not being sealed. Another possibility is building leakage around things like can lights, electrical boxes, exhaust fan enclosures...etc. If there...
There is no need for the return in there unless someone put it there because your ductwork is undersized and it needed the extra air. There are better ways to address that.
You did not mention...
Block off the exhaust - not the intake pipe.
Good call on closing registers to increase SP
A combustion analyzer (if you are using it to see if there is an O2 change when the blower comes on)...
My 2000 sq ft house has a cooling load of 1.5 tons - you are not going to get a return call if you ROT a 3.5 to 4 ton price at me. Just sayin.....
I get the whole "quote over the phone" thing for...
If it is truly power vented, then the termination should not make a difference but then it would also not make much sense that the problem started after re-roofing. Type B vent is also not the...
Strictly speaking from the combustion heating side - I remember quite a while back there was some testing done and conclusions made. I was told years ago that you could save 1%/degree/8hrs. Set...
It is not uncommon to have pressures in the building that are negative with reference to the outside when an air handler is operating. Could be due to duct leaks or door closure issues. So it is...
Loonie and Heybob are correct. THe unit has to be rated for mobile home use. The Carrier unit needs to be modified to handle the high static duct system. Modular and manufactured housing are...
Why can't lawyers use Viagra?
Makes 'em too tall.
swnoel - I agree and wish you well.
Wptski posted:
"A bit off topic but my sister was getting headaches and finally figured out that they only came after doing her laundry! The furnace, water heater and dryer are all gas in that...
No, the codes didn't change. I have an AGA publication from (I believe) 1990 that details the changes in the furnaces and addresses changes in venting, including tables. Venting instructions were...
I think much of what has been said is valid. I am just going to summarize some of it. Condensation on the windows is a function of the temp of the windows and the amount of moisture in the house. ...
High vent temp and low air temp rise? Is the inside of the heat exchanger sooted up?
A couple things to look at might be duct leakage and proper air flow. Kind of hard to tell if the insulation is proper with a blower door. IR camera would be better.
Be aware that this test has some limitations - seeing past the first bend on a tubular heat exanger...etc. Also need to consider heat exchanger construction. Some heat exchangers are built with an...
http://www.visibledefects.com
Out of Missouri I think.
I'm with Loonie on duct issues and air flow. Make sure there are no leaks - particularly from the garage. The air flow thing is huge - if the furnace is cycling on the limit switch, that could...
Tchntch mentioned durability - that's something that I don't think is being talked about enough in this discussion. While the properly sized furnace should run all the time at design temp, it does...
Yes, it's possible you could have had an intermittent problem with the mixing valve. If it happens again, I would have it serviced.
Good thought on the dip tube. The reason I asked about the instantaneous heater is because I was wondering why you have a mixing valve in the first place. Is it really necessary with your system?
Is this an instantaneous heater? If you are somewhat mechanical, maybe you can feel the pipe going to the mixing valve from the tank. If it is always nice and hot and the water coming out of the...
This has been a pretty entertaining thread.
Trane, thanks for summarizing what appears to be the latest point of contention. It is always a good idea to point out where we agree versus disagree. ...
My vote is for electric backup also. I am not a big fan of propane appliances installed below grade. The thought I had was to find out if your electric utility will give a rebate for going all...
Maybe Deejoe is approaching this from a job security perspective. Two six minute cycles at ten degrees outside? (Doesn't seem like a very real world example - must not run at all when its fifty...
Here's another thought to follow what Brendan is saying in regard to negative pressures. If the return runs through the space in which the appliance is located, when the filter gets dirty the leaks...
Another interesting thing about not clipping the clip is that if the limit was intended to be 24 VAC and the secondary on the transformer is not grounded, nothing would burn up, the system will work...
I have caught a lot of nice browns when I used to live in Colorado. Browns are nocturnal. Best fishing I have found is between 10:00 at night to 2:00 in the morning. Woolybuggers are fine or even...
One more thought: your upper opening can't be another pipe run up from the crawlspace. I know - it sounds stupid, but I just saw this recently.
Maybe a better idea is to bring in dedicated...
Sorry, I should have been clearer. Brentplumb mentioned that the furnace could vent out the water heater draft hood if the vent was blocked. Also, if the vent is not sized or configured correctly,...
One thing that wasn't mentioned here that I see alot is the wrong configuration of the wye. With newer appliances, it is common to see things like 4x4x4 wyes. The larger appliance needs to go...
My two cents. I also think it is a good idea to know where you are starting from and where you end up as far as infiltration goes. A blower door test in conjunction with an infrared camera is a...