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Wiring Weil-McLain AquaPlus to a Taco SR503-5

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JS41190 Member Posts: 14

December 19 in Gas Heating

I have a Weil-McLain CGa 5, Weil McLain Aqua Plus 45 and Taco SR503-3.

I am trying to wire the Indirect’s aquastat to the Taco SR. I have both of the inputs on the aquastat getting 24V from the R and W terminals in the Taco SR. (There is no display on the aquastat).
Where would I wire the OUTPUT of the aquastat to on the Taco SR? I am thinking the X X Priority End Switches, but I do not want to destroy either of these controls obviously.

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Comments

Ironman Member Posts: 7,874

December 19 edited December 19

No, the end switch is what brings the boiler on.
You wire the aquastat to the priority zone terminals “R & W”.
“AC1 & AC2” go to the “24V” terminals.

Bob Boan
You can choose to do what you want, but you cannot choose the consequences.
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109A_5 Member Posts: 3,483

December 20 edited December 20

For DHW priority.
Red on the aquastat to R Zone 1 (priority) on the zone panel.
White on the aquastat to W Zone 1 (priority) on the zone panel.
Yellow on the aquastat (AC1) to Zone 1 (priority) C on the zone panel. (AC1 shows it as the grounded side)
Green on the aquastat (AC2) to R on the zone panel.
Enable the priority, the switch array on the Right hand side.
Connect the Main X-X and Priority X-X (DHW) End Switch terminals to the appropriate place on the boiler.
Connect the heating zones to Zone 2 and Zone 3.
Make sure the circulators are wired appropriately.

National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System
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