SIDEARM AQUASTAT QUESTION

[jimdeq]

I am plumbing my domestic hot water heater with a sidearm heat exchanger and i am wondering where do I put the aquastat and what type of aquastat would serve this purpose. I have a A419 Johnson control for the boiler. Should I get another one?

 

[North of 60]

Does your side arm feed a storage tank or is it on demand? Are you activating a pump or the boiler to reach your domestic set point?

 

[North of 60]

OH I see it looks like you are feeding your existing DHW Tank. If you are piping a loop. Feeding the tank into the bottom and back again pulling from the top with the flow not being continuous by the pump, you would need a open on temp rise set of contacts referencing it at the tank. Probably no tapping's. hh:

 

[jimdeq]

I was going to place a tee where the drain comes out of the bottom of the tank. In that tee I would thread a A419 aquastat. Does this sound like it will work?

 

[parkini]

Are you installing a valve to shut off flow to the side arm when the temp is reached?

 

[jimdeq]

The flow prior to the sidearm will be activated by a zone valve.

 

[parkini]

Ranco makes a nice thermostat that you could use to open/close the valve when the temp rises/falls. These come in 24V and 120v versions.

http://www.etcsupply.com/ranco-etc111000000-digital-temperature-controller-p-86.html

 

[jimdeq]

Do you think there better than the A419.