Hot answers tagged

108

Stop, turn off the gas, ventilate the house, and hire a pro. If you applied teflon tape to a flare fitting, you are NOT the person to be installing your gas range. You fundamentally don't understand what you are doing, and doing this wrong can blow up your house. That tends to impair the "learn from your mistakes" method of learning. This is not the place ...


25

Repeating the comments : Do NOT use any pipe dope or tape on flare connections . They are metal to metal seals and anything on the metal sealing surface can cause a leak. Pipe threads (tapered) require dope/tape to get a good seal. I analysed a house fire once and the primary cause was a leak caused by dope on a flare fitting.


24

The actual amount of combustion air - i.e., air flowing past the burner to provide oxygen and leave with less oxygen but more CO2 and possibly other combustion byproducts - is very little. The gap allows additional air to flow in and the combined air, if the ductwork is designed and installed properly, flows through the ductwork and out of the house. If you ...


17

I think some of the answers here are confusing because they don't really address that your furnace has two different air intake/outlets. One is for the combustion system. Air is pulled in from somewhere (usually outside, probably the metal duct on the right), mixed with natural gas, and burned. All of the outside air and combustion products go out of the ...


15

The answer is that it should have a fresh air source! This is an absolute for gas furnaces. Some systems use the “leaks throughout the house” to get the air. The filter in the furnace is for dust to keep that out of the heat exchanger it dose nothing with the gasses that a open combustion fire box generate. The most important thing you can do is to install ...


13

What is happening is called product of combustion. Somewhere around in the house or near the house someone used or opened some sort of stain, paint, varnish or comparable compound including cleaners. The molecules carry over and get mixed in with air and then burned off from open flame. If you light a candle or a lighter you will smell the same odor, ...


13

This is a draft diverter. If the heater was connected directly to the chimney, the hot flue gas would rise, creating draft in the heater. While that is a good thing, the amount of draft would depend on the particular chimney configuration in that installation, amongst other things. Excessive draft can cause problems, such as too much air being drawn ...


12

manassehkatz covered a lot, but the simple answer is constant air flow The draft will change in the chimney as exhaust vents towards it – especially when going from cold air to hot. A draft hood is placed above the upper most part of the gas furnace to draw air into the chimney and makes it possible to draw more or less air through the chimney as necessary ...


11

Gas leak A gas leak could be deadly not only due to inhalation, but also as an explosion hazard. Carbon Monoxide Carbon monoxide is an silent killer. It's colorless, odorless, tasteless, and can kill you before you know you're dead. Combustion Air If the home is sealed tightly, and a source of makeup air is not present (for example if the source is supposed ...


10

Water heaters have a dip tube on the cold water side that puts the cold water into the bottom of the tank. If water pressure is lost on the cold water side, the tank can siphon down through the cold water inlet till it reaches the bottom of the dip tube. Then since there's no water in the tank to absorb heat, the dip tube can melt and the tank can be damaged....


9

There are two types of tubing most people think of, when you say "flexible gas tubing". The first and more common, are flexible gas connectors. These guys are typically 3-6' long, and are used to connect appliances to the gas piping. They are only to be used as a short link between the fixed piping and the appliance, and so are considered a "...


8

WARNING: Furnaces are expensive, complex pieces of equipment. If you don't have the proper tools and/or knowledge, it's often best to let the professionals handle maintenance and repair. Gas Furnace Ignition Sequence: Thermostat calls for heat. Pilot gas valve opens. Ignition control starts (spark or glow). Pilot gas ignites. Flame sensor detects pilot ...


8

The elbow looks good, but what happens after that seems to be a mess. Circled in red appears to be a flared adapter, which is connected to the valve using far too much dope to tell exactly what's going on. I'd assume by the large amount of dope, that it's the wrong type of fitting. Circled in orange appears to be a galvanized steel nipple, which has tape ...


8

According to National Electrical Code, the pipe has to be bonded. However, it can be bonded using the grounding conductor serving the equipment that uses the gas. ...The equipment grounding conductor for the circuit that is likely to energize the piping shall be permitted to serve as the bonding means... As for lightning strikes, the gas company is ...


7

Your furnace probably exhausts more air than it intakes, creating negative pressure in the house which will draw air in. You can try to control is by "encouraging" the makeup air to come in through a route where it hits a filter ASAP. High efficiency furnaces have a (typically PVC) combustion air intake and exhaust and don't result in net air ...


6

Corrugated pipe is generally intended only to be used as the last connection to an appliance, in a living space where it not vulnerable to banging or jostling (usually behind or in a space at the bottom of an appliance), but where it can be seen and accessed if work is being done. It is not intended to be buried in a wall, where it could be pierced by a ...


6

Before the use of pressure relief valves, homeowners were always urged to shut off the gas or electricity to a water heater which has the water cut off. The reasoning was simple: When the water heater came on to heat up its reservoir, it would cause the water to expand, and therefore pressurize, to the point where the tank or a pipe would rupture. As long ...


6

Bad thermocouple - it is supposed to sense the presence of a flame, and turn off the gas if it is on, but nothing is getting hot. Last one I replaced was less than $10 at home depot, it is held in with only a screw or two, and less than an hour of work, including the beer after fixing my friends water heater. Looks like this, they are pretty much universal....


6

Grounding Electrode System You're going to have to install a grounding electrode system. This is typically done by driving two ground rods spaced at least 6' apart, and connecting the rods together using a properly sized bonding jumper. Then you'll install a properly sized grounding electrode conductor, from one of the ground rods back to the main grounding ...


6

Everyone else is right. It’s supposed to be a metal-metal seal, so tape won’t do anything. Glue or caulking would not fix it, and trying to welding it or solder it won’t end nicely. Basically, Either the seal or a thread is damaged and you should get a professional to fix it. If not, your leak could not only destroy your home and possibly your neighbor’s ...


6

Yes it is a leak, a slow leak but a leak nonetheless and it does need to be addressed. Any leak no matter how small is potentially dangerous. You should turn the valve off And address the problem. Some jurisdictions require that all gas connections be handled by a licensed contractor but if you are allowed then you could turn the gas off, use two ...


5

The standard pressure test for new natural gas or propane pipe in my area (NW Oregon) is something anyone can do. Same for installing the gas line. (Why are there so many naysayers on a DIY forum? This is not rocket science:   Just a few new skills to learn.) Before installing the gas pipe, I consulted with a pro (paid $80 for an hour of onsite ...


5

Gas appliances tend to use a thermocouple (which is a self-powering device) to keep the gas valve to the pilot light open. This means that the light will not go out when you turn off the breaker. Thermocouples are pretty interesting - learn more on Wikipedia here.


5

As Tester101 mentioned, a flexible hose is not suitable for concealing in the wall. Similar to plumbing that is in the way, the pipe needs to be re-routed and moved. Depending on your location, this might be something that is permitted by the home owner or it might require a licensed technician to complete. Unlike water where a small leak is unlikely to ...


5

Time to call a professional; either a plumber or the local fire department. They can use more sophisticated leak detectors to pinpoint the leak, and know how to do so safely. Leaking gas is not something to trifle with. Liquid leak detectors (the type that bubble up when gasses are leaking) are great for simple threaded connections, but you've got a whole ...


5

Around here (Pacific Northwest), electricity is inexpensive and gas is reasonable too. However, over the last five years, gas prices have declined and will continue to do so and electric has crept up slowly and probably will forever. Almost all houses here have electric dryers and every single rental (house, apartment, condo) is only electric, even those ...


5

A - Expansion tank. This prevents the pressure increase due to heating water, from damaging the plumbing. The tank is filled with air, that is separated from the water by a bladder. When the water expands due to heating, water compresses the air absorbing the pressure. B - Check valve (or back flow valve). This is designed to only allow water to flow in one ...


5

Typically they will be at minimum, 18" below grade. However this is the grade at the time they are placed. Soil will compact and erode with time which would result in them being shallower than expected. Frost heaving might also raise them. The depth requirements only applies to line-voltage lines. Typically low-voltage lines would not be buried at this ...


5

If your dryer is set up for natural gas, then it isn't going to run on propane - you'll need to install a propane conversion kit. Most manufacturers sell these for specific models, and I'm sure there are some generic after-market kits out there too. These generally aren't that difficult to install - you'll basically be changing the limit in the pressure ...


5

2407.6.2 requires the opening to have a minimum free area of 1 in.2 per 3,000 Btu/h of total input. 140,000 Btu/h / 3,000 Btu/h = 46.667 in.² It also says that the opening cannot be "less than the sum of the areas of all vent connectors in the space." For example, If you had a water heater with a 3" round exhaust duct, and a furnace with a 5&...


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