New answers tagged hvac
1
As far as an ERV and if it is needed depends on how tight your house is.
How much do you need?
This again depends on your home. A newer home built in the last 20 years with a central heating system they can replace the make up air intake save a little of the outgoing heat pull the excess humidity out and improve over all air quality.
To really do this they ...
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If you think a mini split is two expensive you have not compared the structural work and possible engineering stamps required for a package unit. The unit will take at least a 3’ wide hole usually ~18” tall this requires reenforcement of the brick and this would be for a studio style, a 2 bedroom unit will be even more because of the brick work.
Having ...
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A manometer is usually used to measure vacuum. Vacuum measurements ARE affected by both diameter and distance.
I may be taking this to an extreme but high tech equipment has the gauge attached directly to the chamber the more accurate readings needed the larger the connection size. The vacuum pumps are as close as possible and cryogenic pumps are mounted ...
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No.
Pressure drop is caused by gas flowing through a restriction such as a narrow / long piece of tubing. Once the system reaches equilibrium (i.e. the manometer is pressurised), there is no gas flow and therefore can be no influence on the measured pressure.
The diameter / length of the tubing is therefore irrelevant.
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The child's balloon is a great analogy for the gas piping system in a house. But rather than having been tied off with a knot, the neck of the balloon is still pressed to the lips of a parent with infinitely large lung capacity. (The gas piping is not a closed vessel, but is connected through the gas meter to a vast reserve of natural gas in the supplier's ...
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Get a flex duct connector like is used to join two sections of flex together.
Cut completely through at the tear.
Fit the union into the inner sleeve.
Tape inner sleeve to connector.
Pull insulation back over the joint and tape well with duct tape.
If you want to insure it not pulling apart screw through duct tape with sheet metal screws around both sides ...
3
Water spilling out of a furnace is definitely a problem. As you've experienced, at the very least it may lead to soggy rugs/carpets and the ensuing mold. You also noted that there's rust and damage -- those also are not normal; they are signs that leakage is causing your furnace to literally desintegrate.
There are two common sources of water in a furnace. ...
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Your control board's likely shot
On a newer furnace like yours, the fan limit/thermostat function is performed by the control board and its onboard fan relay. This means that a continuously running blower is generally the fault of the fan relay getting welded shut, or occasionally something else failing inside the control board's logic. Either way, ...
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The slot that you noticed is there to hold the pre-filter if the air flow through it was reversed and is not there to be used for a post filter. Running the furnace fan 24/7 is the best option as long as the electronic air cleaner is working properly. Since my wife can smell a fly fart at 1/2 mile, I use a cut to size air filter that has a filter + a ...
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The only reason or use I could see for a post-filter on an electrostatic would be to run a carbon filter for non-particulate odors and/or ozone (which can be a normal byproduct of electrostatic filter operation) reduction.
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It's hard to say in your specific case but generally the answer is yes, more filters equal cleaner air. If you lined up 1000 filters you would have cleaner output than 1 but there are two problems:
You have to push the air through 1000 filters which is a non-trivial problem.
Is 1000 filters really better than 999, or 750, or 100, or 2?
You reach a point ...
1
Where is the make up air for the boiler?
I think I see a vent to the top left but it appears blocked. If that is a fresh air inlet and it is blocked I hope your last will and testament is in order!
I lost a friend to carbon monoxide poisoning years back it is nothing to mess with. Your system needs fresh air for the CO to escape with no fresh air it escapes ...
3
Of course, shortly after posting this question, a little more searching yielded the answer, as detailed in this video.
The vent has been cut and prepared for the installation of a filter rack, but one has not been installed yet.
A U-channel needs bent and installed to hold the filter. After installing the U-channel, it needs snap locked and riveted in place. ...
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Problem solved - connect the C wire! But really the credit should go to @ThreePhaseEel because he helped me figure out which one was C wire from the air handler for the other nest thermostat installation.
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If in Cooling mode neither line should be “hot” but warm is fine. If you are in heating mode hot is ok I know you said cooling but make sure your thermostat is in cooling as a large temp swing can cause it to change modes in auto.
A low refrigerant or “Freon” charge can also cause problems as there is not enough gas to be compressed to a liquid and get ...
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The timing is usually based on conditions not all ignighters are the same some get hotter quicker,.
Quit throwing parts at it.
Look up your model , error codes, I found for that brand
7 or 8 flashes flame could not be established after several attempts,
2,3 or 6 flashes pressure switch problems,
4 or 11 flashes limit switch.
All of these point to different ...
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If i understand correctly the register fit before you installed new baseboard trim and now it the trim is causing a miss-alignment. (My answer is based on that assumption, let me know if that is not correct.)
I would suggest that your best option is to remove the baseboard, put the register back in place then hold the baseboard in place on top of the ...
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Measure the opening in the metal duct and buy a register that will fit that opening. There are metal ducts that are 2 1/4" high and 3 1/4" high with widths at 10", 12", and 14", Also, turn the white register over and measure the size of the protruding piece holding the moveable vanes. If that dimension is larger than the metal duct ...
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That's a custom cut register to fit so close to the wall; you don't want a new one or you'll just have to do that again (which isn't fun).
The problem is the mangled boot. Straighten it as best you can with some pliers. Then attach it like it's supposed to be with some screws into the flooring/subfloor. Find the corner it likes to sit in, biased to either ...
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You can try one of these:
Move the register opening.
Change the size of the opening so a new register will fit.
Order a custom sized register that will fit your new opening. It won’t match the design of your existing registers, but it’s an easy fix for your new duct opening.
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You want the brown wire
Based on the diagrams in the manual, the brown wire is the C wire you're after, so connect the blue wire in your thermostat cable to the existing bundle there. We can also tell it's your C wire from the fact the cable off to your air conditioner's outdoor unit connects to that wire in addition to the yellow Y wire from your ...
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The air flow is determined by the size of the opening immediately at the return to the blower .
You can have the whole wall open and it won’t make a difference ! It may be quieter because there’s less funneling goiing on. Farther away from the unit.. You’re just reducing the filtration surface of the filter so it won’t clog up sooner. Most mfg. have the ...
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Get your booklet that the installer should have left and turn to the trouble shooting page. In my book, 6 flashes says to check to make sure that the combustion air inlet is not blocked or restricted in any way. Make sure that the burners are aligned properly, check the draft inducer, check the rollout limit, and to check/replace a 3A automotive fuse. Last, ...
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There a number of things you can check, but basically the low pressure switch will stop the furnace if it detects difficulty in your draft pressure for exhaust gas.
Check the switch itself, usually their are a few wires and a couple rubber vaccuum tubes. Ensure the wires and rubber vaccum hoses are connected well. You can remove the hoses and blow through ...
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Filtering is not only a science but a big cost impact on system design.
I install filters at the entrance to the trunk duct then add electrostatic at the furnace entrance, some put high MERV or even HEPA at the furnace and here are the reasons;
The problem with HEPA filters is the pressure drop across them if used at the entrance trunk ductwork will oil can ...
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Hey I am a professional hvac contractor that specific zone board will not do 3 stages of heat so it will not work with a 2 stage heat pump and heat strips you need to replace that board with Honeywell hz432 zone board tha th should fix your issues
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I found the problem while getting the wiring diagram. I'm posting my answer in case someone else comes across a similar problem.
Why it didn't work right
The humidifier was wired into the EAC terminal. This terminal only becomes active over a certain RPM and so the humidifier was only coming on when activating the fan manually, or when the heat hits stage 2. ...
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Looks like I had to rotate the pilot flame a few degrees to get it to better align with the thermocouple, especially when the fireplace was lit. This seems to have resolved the issue.
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I'd start by replacing the thermocouple. They are cheap and if it doesn't solve the problem you just have a spare kicking around.
If it doesn't fix the problem then I'd replace the gas valve. I had a honey well gas valve which I believe has an internal spring mechanism - when the ambient temperature reached certain temperatures the spring would not work ...
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It's certainly possible - whether you can get someone in your area to install and service it, and whether you can afford it, are two entirely different questions.
Air source heat pumps that are designed for it can operate efficiently below 0°F - many mini splits qualify, and few whole house units do, for whatever reason. As such, they also work fine at 10F ...
1
What you are seeing is actually normal IMHO and as a result of the second law of thermodynamics. Heat travels from hot things to cold things.
You are under the impression heat rises. That is only true for AIR. It is NOT true for solid objects.
I assume this is house-on-slab not house-on-crawlspace or house-on-basement.
Your downstairs is like a piece of ...
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You don't have the C wire brought out to the thermostat.
See that COND UNIT CONTACTOR On the right is the Y wire going to the stat
On the left is the C wire going to the transformer common. It is not labeled C but nevertheless it IS the C wire.
If you have more than 4 individual wires going to the stat then you would have an unused wire, you could connect ...
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Filtering the return air at the point of ingress is by far the best option. That way there is no dirt accumulating in the return ducts and you can readily see the condition of the filter.
I removed my internal filter and put in a surface mount 20x20 Merv13 on top of the former return grill which I also removed. It's a vertical configuration and it's ...
3
There's a chance that a backflow-preventer valve is stuck open, allowing hot water from Zone-One piping to flow "backwards" into Zone-3 piping. See if you can find these valves- they likely are close to your furnace. They are probably green, with a directional arrow printed into the metal housing (and have only one inlet and one outlet).
Also, ...
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