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Old 02-12-2012, 04:56 PM   #16
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80 Gallon Water Heater Thermostat


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Originally Posted by myowneq View Post
Zappa, on the wiring, they are wired seperately the entire run from the panel. In their own minds, the heaters are completely seperately functioning units. They have no influence on each other.

Thanks,
Tim
I actually meant the wiring inside between the elements and thermo's. Are both units identical. I can't understand the super high wattage on one.

Oh....and which unit is working correctly? 53 or 21


Last edited by zappa; 02-12-2012 at 05:02 PM.
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Old 02-12-2012, 05:21 PM   #17
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80 Gallon Water Heater Thermostat


53 had power to both units when I tested this morning. And the wiring on the inside appears the same. All the colored wires are in the same place.
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Old 02-12-2012, 05:30 PM   #18
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Thanks, it's just very confusing now. Did you meter right on the elements and saw 480 on both at the same time, or within a few seconds obviously.
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Old 02-12-2012, 05:46 PM   #19
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80 Gallon Water Heater Thermostat


As quick as I can swap from one to the other, yeah.
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Old 02-12-2012, 05:58 PM   #20
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80 Gallon Water Heater Thermostat


Kewl....I do remember looking at my home water heater and seeing many different factory confiigurations.
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Old 02-13-2012, 01:13 AM   #21
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80 Gallon Water Heater Thermostat


I just want to give the readers a head up this water heater what OP talking about this is not conferated the same as standard run of mill resdentail water heaters are wired.

This is actaually a " open delta " connected water heater for two reason one is this is actually a three phase water heater but run in open delta fashon so the current reading will get little wonky here.

The 53 ohms reading is correct for 480 volts system for 6 KW heating elements it the same for our 4.5 KW @ 415 volts elements.

But the 21 ohms reading you will either overheat the element or trip the breaker due the wattage do go sky high 11 to 12 KW or more ( I am suprised that did not expoded yet )

To OP can you stated the model number to us if possible if you are back on the vessel ??

And the way you describe and I have see this quite few time it is indepent heating elements so they can go on both at the same time or run as need to be.

Merci,
Marc
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Old 02-13-2012, 03:55 AM   #22
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80 Gallon Water Heater Thermostat


Maybe someone replaced the 53 ohm elements with 21 ohm units? As noted elsewhere in this thread, putting the lower resistance elements on a 480 power source would result in more than double the output in kW....

Your upper control appears to be bad, as it is supposed to switch between the upper and lower elements, not allowing them both to be heating at the same time. You could bypass the upper element, and feed power directly to the lower control as a short term fix.
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Old 02-13-2012, 08:32 AM   #23
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The water heater is Rheem / Rudd ELD80-B. It is a 3 phase 480volt heater. On the sticker, the wattages listed are 4500 for the upper, 4500 for the lower, and 4500 for the total. Sorry, I should have posted that in my first post.
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Old 02-13-2012, 09:22 AM   #24
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80 Gallon Water Heater Thermostat


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The water heater is Rheem / Rudd ELD80-B. It is a 3 phase 480volt heater. On the sticker, the wattages listed are 4500 for the upper, 4500 for the lower, and 4500 for the total. Sorry, I should have posted that in my first post.
It sounds like your 53 heater has a problem also. Like maybe the top contacts fused together allowing both elements to be on at the same time.

I still don't know how the 21 heater is operating without blowing up or tripping the overload protection.

How did the bathing emergency go last night? Hear any cold water screams?
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Old 02-13-2012, 09:26 AM   #25
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80 Gallon Water Heater Thermostat


I can't hear them in their bathroom. I know in mine it wasn't pretty. I tried to take a shower at 11pm after everyone had been in bed an hour and water never got any warmer than luke warm and just got colder. I ended up taking a Navy shower. Get under the cold water just long enough to get wet. Shampoo and soap everything, jump back in. I've probably still got soap on me.

My office is sending out two new elements for that heater. I've sent them all the info I have, so let's see what I get.

Thanks ya'll.

Tim
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Old 02-13-2012, 09:43 AM   #26
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I would include 2 new upper thermos as well.
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Old 02-13-2012, 10:50 AM   #27
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Hi Everyone,

So I'm offshore and having an issue with one of my water heaters on the boat. So here's what I have. I have two 80 gallon heaters plumbed in parallel and wired with 480. Each heater has two elements & thermostats. Thermostats are set for 150*. Water heaters are same model installed at the same time.

Simple question first. On one heater, resistance on each element was 53. On the other, resistance was 21 on each. On the 2nd, the elements are not identical to the other heater elements which leads me to believe the 21 ohms are not original. Not sure if that is an issue or even something to worry about.

For the bigger problem, I've tracked the issue down to one thermostat. My lower thermostat & element is getting no power on one wire, so it's not heating.

The top picture is of the upper thermostat / element. Wires are left side are both supposed to be white (hot supply) (used to be). On the right side, top going down, blue (hot supply), blue (hot to upper element), and red (hot to lower thermostat). If you look in the upper left corner, you can see a hit of the black wire. It's the third hot supply and runs to the lower heater.



The bottom picture is of the lower thermostat / element. The black wire on left is hot supply and heads to element after thermostat. Red comes from the upper thermostat.



So, using my good heater as an example, I learned the red wire in the upper heater is getting it's power from blue supply through the thermostat chassis. On my bad heater, this is not happening. I'm getting no power to the red wire. The chassis is not hot (no voltage) like the other one is.

So my assumption is, I need a new upper thermostat. Am I correct?

As I am on a boat in the middle of nowhere, and I'm correct in my assumption, can I just hook up the red wire in the upper heater to the blue post going to the heater for a temporary fix?

If need any other info or more pics, please ask. I can always get more.

Thanks,
Timothy
How many power wires do you have going to each heater?
I guess ive never seen a water heater wired to 480 before,are you sure its not 277v?
Picture ?

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