Boiler control wiring

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Old 12-22-10, 08:11 AM
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Boiler control wiring

Hi guys, I need a little wiring help with my new setup- heres what I have. Existing Peerless boiler with tankless DHW coil, honeywell 8124 aquastat,controlling 1 zone heat. I just added 2 more zones radiant heat with cirulator pumps. I have a new taco sr504 relay. I'll wire all 3 pumps to the new relay as well as t'stats. My questions are where do I get power from for the new taco 504, and what do I need to do with the old 8124 a'stat. Thanks!
 
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Old 12-22-10, 11:35 AM
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The 120VAC source for the TACO panel should come from the same source that currently feeds the boiler system. When you shut the boiler down, it should shut EVERYTHING down, pumps and all.

Not sure what you mean by:

what do I need to do with the old 8124 a'stat
You need to leave it right where it is... the existing thermostat was connected to that, on the T and TV terminals. You wire the existing thermostat to the appropriate 'channel' on your 504 panel, and wire the ZR and ZC as 120VAC wiring to the aquastat as shown in the 504 instruction sheet.

You removed the existing circ from the C1 and C2 terminals in the 8124 and wired that to the 504 panel, right? that's fine...

NOW, the possibly BAD news...

You said RADIANT ZONES, right? Did you just hook these zones directly to the boiler pipes? or did you install MIXING VALVES so you can regulate the temperature of the water going to those 'radiant zones' ?

If you plan on piping the high temp water to the radiant zones, that's wrong...
 

Last edited by NJT; 12-22-10 at 05:23 PM.
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Old 12-22-10, 12:01 PM
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Ok, so i'll come off the existing boiler juntion box for 120v. Leaving the existing wiring to the aquastat, right? No problems on the radiant loops-mixing valves, pumps, manifolds, flow meters, ect. Yes, all circs. are now in the 504. Is the end switch 120v or 24v? Taco wiring diagram shows one side of end sw to ZR on a'stat, jumper on other side of end sw with ZC going to ZC on a'stat. I'm getting there! Thanks.
 
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Old 12-22-10, 02:45 PM
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I'm assuming end switch is 120v, is that right? Thanks
 
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Old 12-22-10, 04:54 PM
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i'm assuming end switch is 120v, is that right?
no! Don't never assume nutin!
 

Last edited by NJT; 12-22-10 at 05:26 PM.
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Old 12-22-10, 04:55 PM
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http://www.taco-hvac.com/uploads/Fil...102-084%29.pdf

Hang on... my bad... I see that you have an 8124 aquastat, so you are running WARM START, is that correct?
 

Last edited by NJT; 12-22-10 at 05:26 PM.
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Old 12-22-10, 05:11 PM
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OK, sorry... I was thinking COLD START... don't mind me, I had a crappy day.

Yes, that will be 120 VAC wiring from the ZR and ZC in the 8124 to 504 terminals as per the schematic.

I edited my previous post where I said to wire the endswitch on the 504 to the T and TV in the 8124... there will be NO CONNECTION to the T and TV terminals with the new setup.
 
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Old 12-22-10, 06:13 PM
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Awesome, I'm on it right now, gonna wait till morning to crank it up. I shouldn't assume, it makes an a$$>> blah, blah,blah! LOL!! O yeah, its warm start. Thanks for ur time, I really appreciate it.
 
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