Electric Water Heaters Supply Facilities Maintenance

Water heaters in general and because  it’s right here you may have questions  about it what kind of advantages and let  at thermostatic mixing valve give the  water heater in the customer well you  have several advantages to a  thermostatic mixing valve one is it  prevents scalding we’ve recently had  some codes go through a si SSE 1070  saying that the thermostat shouldn’t be  the only temperature limiting device on  the watery right stuff can go wrong  elements to ground which we’ll talk  about later thermostats could stick and  that could potentially cause you to be  burned because the water is going to  become scalding so with a mixing valve  it’ll prevent that because it only at a  premix the water.

We only have say in  this case 120 degree water coming out no  matter how hot the tank is right another  advantage of a mixing valve is is this  you can increase the temperature of the  water heater and pretty much make your  water heater feel bigger in some cases  about 30% bigger and so you could get a  lot more hot water because you would  draw less hot water off the tank because  the storage temperature is so high and  use more cold water to get the  temperature you typically take a shower  with and so it could make a smaller  water heater feel bigger yeah that’s  that’s a great advantage because you  would you’d use less hot water because  the water is a lot hotter they’ll use  less of that and add more cold water to  mix it down so that’s a that’s a great  feature now we are we actually recommend  is point-of-use mixing valves at each  point of use you know each hot water  faucet this is this is an example of a  whole-house mixing valve correct.

Another thing on this installation we have a  thermal expansion tank and we can’t talk  about installation without thermal  expansion tanks if we recommend them  they’re highly recommended because  especially on a closed water system  yeah really actually if you read the  manual the warranty with the water  heater if you’re on a closed water  system for the warranty a plot to apply  you have to have a properly installed  properly pre-charged expansion tank  which is very important yes a lot of  people install them but they don’t  preach all yeah that’s my next thing  that’s one of the biggest mistakes that  somebody will make especially di wires  they’ll install the thermal expansion  tank think they’re doing you know doing  well you know I did it all right and end  up having the same  problem still having thermal expansion  because they didn’t pre-charge the the  thermal expansion tank with air and  let’s talk about that how would we do  that the correct way well the correct  way to charge an expansion take and this  is very important you have to check your  water pressure first right you want to  check your water pressure.

We typically  recommend over a 24-hour period and let  me have an example of a water pressure  gage of a water pressure gage right here  this one has a lazy hand and why that’s  important is this your water pressure  typically is going to fluctuate some and  so the way this works you have a black  hand that turns up the dial and it  carries the red hand along with it but  what happens is the black can gives you  your actual static pressure right  current water pressure right then but at  its highest point it’s gonna carry the  red-handle long with it and even if the  black can’t drops the red hands gonna  stay where it is so it’s gonna show us  our highest pressure it’s gonna show the  highest pressure which is very important  and the reason why that’s very important  is this typically this is not something  that’s strictly enforced at the time  typically water pressure should never  exceed about 80 psi okay we actually  recommend in a house or residential home  for your water pressure to be somewhere  between 50 and 60 psi okay if your water  pressure exceeds 80 psi we typically  recommend that you stall a pressure  reducing valve which lowers the water  pressure and set it somewhere between 50  and 60 psi okay now to hold that  pressure steady yes okay which would  cause your tank to live longer to cause  your toilet valves and your ice makers  and all this plumbing stuff in your home  to last longer but that’s just typically  what we recommend okay and then we’re  going to set our pressure on our thermal  expansion tank to whatever pressure are  our incoming water pressure is right  correct say.

We have 53 psi of water  pressure right it stays at 53 all the  time it’s 53 before we ever install the  thermal expansion tank on the cold water  line we’d fill it full of 50 53 psi of  air needs to match exactly what your  water pressure is because if it doesn’t  say you don’t have enough air in it or  in the instance  you have too much air in it it’s gonna  act like you do not like you don’t even  have it yeah it’s not doing anything at  all  yeah not enough air it’s just gonna  press the bladder all the way to the top  and not give you anywhere to absorb that  additional volume of water or if the too  much air in it it’s not even gonna move  the Blatt okay and so it’s very  important that you properly install the  expansion tank yes so you got to do all  of this before you install it before we  put it on our water line we’re going to  pre charge that that the air into our  thermal expansion tank and then we’re  gonna go ahead and put it on so it can  work properly so it’s just a couple  things that we want to keep in mind  whenever you’re working on water heaters  out in the field you might want to check  the the pressure of the thermal  expansion tank if they’re experiencing  thermal expansion.

Because it may have  not been you know installed correctly  okay so let’s go ahead and get with this water heater let’s talk about you know  that’s a little bit about the install of  of an electric water heater now how the  water heater works let’s let’s go ahead  and talk about that and and let’s let’s  talk a little bit of the sequence of  operation how this water heater works  and how power flows through this water  heater alright the way a typical  electric water heater works is this you install the water heater you have a  complete cold tank of water the upper  element and upper thermostat comes on  first so the upper thermostat powers the  upper element okay alright and then once  it satisfies this top 20% of the tank  for temperature the thermostat transfers  power down to the bottom thermostat  which powers the lower element and it  hates the other 80% of the tank okay so  that’s on a cold tank of water cold tank  so you’ve got a cold tank just installed  it the first thing that’s gonna happen  is this upper thermostat and heating  element are gonna energize  gonna heat up the top 20% until that  thermostat satisfies correct whatever  temperature you have set for which is  120 is what we recommend they’re factory  preset at 120.

Then we’re gonna throw  power down to the lower thermostat and  heating element and it’s going to heat  the rest of the tank up until it comes  in it comes up to temperature and then  the unit will go into standby now now  the water heaters hot now  what happens when they start drawing  water off a hot tank well say I have a  hot tank of water sitting there ready  for me to use and I go to take a shower  all right cold water is gonna enter the  tank through the cold water connection  it’s gonna enter through the dip tube  and dump into the bottom of the heater  okay and cold water is gonna push the  hot water out well if you think about  that the cold water is going to come in  and dump to the bottom that’s going to  cool the lower portion of the tank which  is going to cause the lower thermostat  to power the lower element and it’s  going to come on okay and then you know  you take a shower you’re gonna use  several gallons of hot water but unless  you drain this water here completely of  hot water the upper element thermostat  may never power back up to kick on okay  usually your lower element and lower  thermostat or the workhorse and they  heat most of the water yeah and if  anything was to fail usually first is  that lower element yes just like with  anything if you have a part that works a  lot usually the part that works the most  it’s typically the one that’s going to  fail the most because of usage yeah and  I want to kind of go back to the cold  tank.


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