shawn06260
New Member
Hi All, was hoping someone might be able to help me out here. I'm replacing a 40yr old boiler which currently has 2 heating zones and an indirect tank. It currently has 3 old R845A relays which I'm hoping to replace with a new Taco SR503. The Aquastat that comes with my burner is a Hydrolevel 3250 Plus. https://hydrolevel.com/wp-content/uploads/2019/11/HydroStat-3250-Plus-Instructions-web-111919.pdf
My question is there seems to be a couple of different options to wire the indirect zone with priority and just wanted to make sure I'm doing it correctly. I originally planned to wire per diagram #5 in that manual, with the End Switch wired to the T/T on the aquastat. Then I planned on tying in the ZR of the aquastat to the hot of the indirect circulator.
The only thing that is causing me concern is the there's another diagram, #8 that's a little different and has a note "Taco’s SR503 combines ZR amd X2." Is this saying that I don't need to run that hot leg from the priority circulator circuit? Does the SR503 take care of prioritizing that Zone 3 on its own?
https://s3.amazonaws.com/s3.supplyhouse.com/manuals/1351150925280/85270_PROD_FILE.pdf
Thanks in advance for your help.
My question is there seems to be a couple of different options to wire the indirect zone with priority and just wanted to make sure I'm doing it correctly. I originally planned to wire per diagram #5 in that manual, with the End Switch wired to the T/T on the aquastat. Then I planned on tying in the ZR of the aquastat to the hot of the indirect circulator.
The only thing that is causing me concern is the there's another diagram, #8 that's a little different and has a note "Taco’s SR503 combines ZR amd X2." Is this saying that I don't need to run that hot leg from the priority circulator circuit? Does the SR503 take care of prioritizing that Zone 3 on its own?
https://s3.amazonaws.com/s3.supplyhouse.com/manuals/1351150925280/85270_PROD_FILE.pdf
Thanks in advance for your help.