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.