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Indirect water heater wiring.
ekd4176
Member Posts: 2
I currently have a Burnham AL53A indirect water heater that is leaking and I would like to replace it. I am considering a Burnham AL50SL but as I look at the wiring, the TPI calls for 24v power but I don't know where to get that from. The current setup has a single thermostat wire from the water tank Aquastat that goes to a Honeywell YHR845A switching relay that runs the Taco circulator. The new water heater calls for a Circ/TT hookup as well as the 24v hookup. Should I connect the TPI TT to the YHR845A as it is now and run another line from a nearby 24v transformer to the 24v connection on the TPI. Thanks Eric
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Comments
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The electronic aquastat needs 24v to power its logic. Anywhere you can pick up power from will work.Bob Boan
You can choose to do what you want, but you cannot choose the consequences.0 -
Thank you very much0
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There is no access to the common (C) on the Honeywell YHR845A. You will need to look elsewhere for 24V or go under the printed circuit board to find the C side of the transformer to solder to, but that will void the warranty and the protection of the UL listing of that control.
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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I really dislike this absurd trend of having to power a controller on something as simple as an indirect water heater.Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes2 -
Hi think i'm have same/similar issue...bought new indirect hot water heater yesterday (last unit was 20 years old).
Connected thermostat to taco sr501 (no wiring change in taco). Taco control makes buzzing sound and zone is always open calling for heat.
Will not start circulator or fire boiler but red light is on and it buzzes like a street light at night. Never did before with old unit.
New thermostat mentions 24v, I see that in the taco box as well but don't know what to do.
I have hot water to heater. I get it by shutting unit kill switch when heater actually needs hot water but once up to temp the zone never shuts off (light) but pump and boiler are off and taco zone buzzes slightly. Can hear when you get close.
Has to be mis wired. I don't understand the 24v but see those markings on the thermostat and taco control. I'm assuming I have to do something there but don't know what.
Looking for advice. Thanks so much...
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What brand heater is that? Do you have the instructions?
It looks like the old wires should be on the other 2 terminals on the left. The terminals on the bottom should be connected to R and C on the Taco to bring power to the controller.
"If you can't explain it simply, you don't understand it well enough"
Albert Einstein0 -
Anything to make it more complicated and more expensive0
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I think it's done @JohnNY for the flash-bang led display. People get all hopped up if there are cool digital numbers to look at.
I completly agree with your sentiment.Serving Northern Maine HVAC & Controls. I burn wood, it smells good!0 -
Nothing like making things far more complicated than they need to be.Solid_Fuel_Man said:I think it's done @JohnNY for the flash-bang led display. People get all hopped up if there are cool digital numbers to look at.
I completly agree with your sentiment.
Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
Consulting & Troubleshooting
Heating in NYC or NJ.
Classes1 -
@ekd4176 You will need to provide a seperate 24V transformer to provide power to operate the electronic control. This is your diagram
@Nikos10 Yours is easier. This is your wiring diagram.
Three conductor wire from the water heater thermostat to the switching relay. You need a jumper wire to connect the red wire from R on the Taco SR relay on 2 terminals of the water tank thermostat
A third wire (green) for the common or return path to operate the LED and onboard microprocessor of the water heater thermostat.
Merry Christmas
Ed
BTW electric is colorblind... you don't need to use green if your 3 conductor wire has a different colorEdward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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