Wiring Super stor 45

BillAllen

I have an oil fired boiler with an L8124L high and low limit has 2 zone valves and 1 system circ. I'm adding the SS with circ and a Taco Sr501-4 relay. Question: the wiring on the 8124 ZR and ZC are to be used to power the hot NH on the 501 or send power in from independent source? In other words do I need to use and maintain low limit in the SS by sending power through ZC & ZR?

BillAllen

Im using the sr501-2 connected to the L8124L. Wired on the 501
terminals 6 and 5 to tt on 8124 and aqua stat on SS to tt in 501.
All working ok except existing boiler circ operates when ss calls and does not need to. The ss circ is only needed. Not sure how to wire so boiler circ does not call on a ss call?

BillAllen

I'd need to see a diagram of wiring.

BillAllen

What I have now on existing L8124L I have my 501 6/5 terminals connected to TT on 8124 but there are also 2 other wires connected to TT on the 8124 operating the existing heat. So TT on the 8124 has 2 wires on 1 and 2 wires on the other terminal.
They way I believe is correct is "alternative wiring". 501 terminals 6/5 connect as shown. 6 goes to SS circ hot and terminal 5 connects to "3" on the 501 and to ZC on the 8124. ZR on the 8124 connects to "4" on the 501. We end up with only the existing 2 wires on the 8124 that for heat.

BillAllen

Ya exactly as Taco describes it. But will this prevent the boiler circ from coming on on DW call unless needed? Or removing the LL red and yellow wires advisable?

BillAllen

True, but when the aqua stat on SS calls TT closes on the 8124 (because it is connected to the 8124) thus boiler circ energizes. I will change that Monday.