water heater tp valve
remzy
16 years ago
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lazypup
16 years agoremzy
16 years agoRelated Discussions
When does a water heater not require a T&P valve
Comments (10)zl700 has the answer, but now let me explain a bit futher. Code mandates that when a T&P valve is installed we must attach a FULL BORE gravity flow drain line to the output of the T&P valve. All horizontal portions of that drain line must be pitched at a minimum of 1/4" per foot downward towards the discharge end of the pipe and the pipe MUST BE terminated outside the structure or into an approved indirect waste receptor. At a minimum, if the water heater is installed in an unfinished basment or utility vault that has a floor drain, the line from the T&P may go straight down and discharge at a point not more than 18" above the floor. The water may then run across the floor to a floor drain or sump pit. It may also be run to a utility sink, floor drain or sump pit providing the discharge end of the line remains a minimum of 2" above the flood level rim of the receptor. HOWEVER: in some instances such as in homes served by a septic tank or where the municipal sewer lines are shallow the house main drain enters the structure at an elevation which is too high to achieve a gravity floor floor drain or even a utility sink and some of those structures do not have a sump pit. In a situation where you cannot achieve a gravity flow to an approved waste receptor such as described above, the T&P valve is removed and replaced with a WATTS 210 gas valve. The gas supply line for the water heater is then connected to the input side of the Watts 210 gas valve and a line is connected from the output side of the gas valve to the water heater burner contol. If the temp or pressure in the water heater were to then exceed the mandated limits the Watts 210 valve will shut off the gas supply to the burner. When the Watts 210 valve is installed on the water heater you must then go to a convenient point above grade and install a "pressure relief valve" and terminate that through the wall to the exterior or into an approved waste receptor....See MoreNew water heater, problems with T&P valve
Comments (16)I believed you when you said, " I replaced (the original tank), wired it as directed." Now, this new tidbit has me concerned about the whole electrical scheme. As I started to read your message, I expected that you were trying to say that there was a circuit taken off of one leg of the line. But you describe it as a line coming into the heater and powering one of the elements. That suggests that the other element is also powered by a simplex, 110-V circuit. If so, this needs rewiring as you have a seriously miswired condition. I suspect this because you said: "I tested the connections numerous times and always came up with 120, never 240" To get 240 V, you need to have two legs of the service wired into the heater. And this would put each (say, the Âblack and the ÂredÂ) on each heater, the upper and the lower. Since each of them has a second terminal, those are wired to the neutral (white) wire. If that is the case, that you have a 3- or 4-wire cable properly connected to the heater, then it means that the one element was not able to be shut down by the thermostat. Moreover, it also appears that the chance wiring has allowed the one element to be powered by 240V via the cord connection. Certainly, removing this cord is the right and the first thing to do. It appears that, for the first six hours, the new heater was being warmed by only one element. When the thermostat attempted to shut down both elements, the miswiring stopped one and started the other at doubled voltage. (Boom!) While a water heater is power with 240V, the elements operate independently at 120V, each. They should never see 240V, unlike the heating element in a clothes dryer. Now, if the unit is properly wired, you can test voltage again and get the following results. If the colors are Black, Red and White (and Green, if available,) the voltages will read as follows: B to R > 240V; B to W > 120V; R to W > 120V; W to G > zero V. For purposes of testing only, you should get the same voltages comparing a HOT wire to either neutral or ground (Green.) The White and Green will only share a terminal in the service entrance panel. (Different, though if the feed is a subpanel.) Please reply. Pinoke...See MoreNo Water in Shower after shutting Cold water valve of Water heater
Comments (1)Some valve bodies have an auto shut off feature which is designed to prevent scalding. If one side has no pressure, both sides are shut off inside the valve body. Or you dislodged some huge chunk of rust and it made its way to the shower valve. I can't see from here. Try dissembling the shower valve and flushing it out....See MorePressure boosting pump causes water heater T&P valve to open
Comments (10)You are getting closer to the 150 psi temporarily. That's really, really hard on all of your plumbing - especially the water heater. The P&T valve is the last line of defense against catastrophic tank failure. Do not allow that to continue. Install the expansion tank and set the pressure to 60 psi. If you want to up the size from the 2 gal to the 4 gal that's fine too. It will give you just a bit more cushion. Be sure that you support the tank - particularly the larger one - properly. Thanks to oneandonlybobjones for the sizing chart - I like it when people give references. weedmeister is correct about what the higher pressure does to things: It's hard on solenoid valves in washers, ice makers and dishwashers. It also exaggerates water hammer and stresses things like flex risers and flex hoses. Coming home to a burst washing machine hose that has been running for hours and having your furniture float out the front door when you open it is no fun. If you don't have enough flow at 60 psi you might look at cleaning aerators and such... but in general you shouldn't expect to pressure wash the dishes from the kitchen faucet....See Moreremzy
16 years agolazypup
16 years agoUser
16 years agolazypup
16 years agoUser
16 years agoUser
16 years agolazypup
16 years agoremzy
16 years ago
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