RA832A for priority

IZZY

Thanks.

IZZY

Looking for wiring diagram for a Honeywell RA832A wiring for priority for DHW. Went on Honeywell's website and found the literature, but only showed standard wiring.
Thanks, and Happy New Year.
Izzy

Unknown

Priority

Izzy, I don`t see that you can wire a Honeywell RA832A for priority unless you start adding others(relays), within the circuit.

IZZY

I didn't think so. It doesn't seem to make sense without, like you said, adding other relays, but I have an indirect fired water heater wired through an RA832A as its own zone, just like all the others. The homeowner runs out of domestic hot water when they are showering, which just started recently; they claim it has been fine in the past. The 80 gallon Boilermate is only about 4 years old. Another plumber told her that the Boilermate is defective and needed to be replaced. When I went to check it out I noticed that the water tank was wired like all the others, but it was the first one in the line of relays. This is what prompted my question. (Incidentally, I found the boiler supply and return piping temps to be fine at the Boilermate, and the temp of the outlet dhw seemed to never drop below 130 while I ran two faucets for about a half an hour, so I don't think there is anything wrong with the unit, I think there is a cross connection, like a bad shower body passing cold water, I have to investigate further). Anyway what would I need to do, or get, to wire the unit for priority?

Unknown

Any of the Multizone panels

from Taco, Argo, Honeywell will allow you to run all your heating zones and give priority to the DHW zone by the priority switch on those panels.

Honeywell is the older R8888 Series or the new AQ2000 series

Taco is the SR series 502, 503 etc. or the EXP version

Argo is the ARM series of controls

Also Erie offers multizone panels

Al Corelli_2

Boilermate

Doesn't the Boilermate (both knob control and Smart control) have a built in relay for priority?

Check the instructions. You may not have to buy anything.

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IZZY

Thanks.

zeke

Look for a relay between the one for the hot water heating and the others. The fact that this was working in a priority mode seems to indicate that a relay with normally closed contacts is welded closed so that on a call for HW the contacts feeding the other zones is not opening, as it should. Should be a simple changeout of that relay.

To clarify, the way it normally works is on a call for HW, the 832a serving the HW also powers the coil to that added relay whose normally closed contact,opens thus prohibiting power from reaching the remaining 832's. When the HW system is satisfied the contacts close and the other zones can be serviced.