Switching Relay Help :)

Switching Relay Help :)

PostBy: farrell2k On: Tue Jan 28, 2014 8:55 pm

So I was forced to buy a new switching relay for my upstairs zone. I picked up a taco sr501. I am not sure if I have the wiring right, as the wiring diagram says that I should be seeing a green light all the time, but I am only seeing this green light when the boiler is getting up to temperature. Here's what I have and what I did:

This is the aquastat on my kaa2. https://customer.honeywell.com/resources/techlit/TechLitDocuments/60-0000s/60-2061.pdf
This is the taco relay. http://www.pexuniverse.com/docs/pdf/102-169.pdf

From what I can decipher, from the aquastat I go from ZR(hot) to H (hot) on the sr01 then ZC(white) on the aquastat to N(white) on the sr 501. I then connect the white from the circulator to N on the sr501, then from 4(n/o) on the sr501 to the circulator (hot).

Does that make sense or do I have something backwards, because it sure seems so.

Stoker Coal Boiler: Kaa2
Stove/Furnace Make: Keystoker
Stove/Furnace Model: KA2

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Re: Switching Relay Help :)

PostBy: cabinover On: Tue Jan 28, 2014 10:02 pm

You need 120VAC across H & N on your SR501.

According to the SR instructions:

ZR goes to Terminal 4

ZC goes to Terminal 3 & 5

Neutral from your 120VAC supply goes to N and the white wire for circulator.

Hot from your 120VAC goes to H on SR501

Hot (or black) for circulator goes from Terminal 6 to circulator.

Sounds like you don't have 120VAC to the unit and it's backfeeding from the aquastat.

Check each wire as written and I bet you find the problem quickly, just a matter of tracing wires. It can get confusing at times with all of the connections to be made.

Good luck!
Stoker Coal Boiler: Hybrid Axeman Anderson 130
Baseburners & Antiques: Sparkle #12
Coal Size/Type: Pea, Buckwheat, Nut
Other Heating: LP Hot air. WA TX for coal use.