Wiring for Cold Start

Mark_104

I just installed a Weil Mclain WTGO oil burner. I also have a boilermate. Both the coil and boilermater are piped to work separtely or together. I am told that this boiler is a cold start boiler so I would like to shut of the tankless coil and use the boilermate stand alone. I also have an Argo relay control. How can I wire the boiler for 'cold start'? I cannot figure out how to shut off the low limit on the Honeywell L7224A Aquastat that came with the boiler. Any info would be appreciated.

Thanks
Mark

Norm Harvey

Heres the info on your current control

http://customer.honeywell.com/techlit/pdf/68-0000s/68-0281.pdf

I havent read through all of it but im pretty sure you cant turn off the low limit,.. youll need a control like this

http://customer.honeywell.com/techlit/pdf/60-0000s/60-2278.pdf



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Glenn Sossin_2

The old control

the L-8124A, you could cut the right wire and you have what you want. Alas new technologies.

Heres an idea that I think might work. What if you controlled the AC power to this control such that when a zone called, the aquastat got power, tt was wired closed, and the burner would fire up?


It's similar to what they used to do on the R8184G oil primary control that had a tt connection.

Jump out TT on this control so in theory, it's always calling. Feed 120 vac to this aquastat control using the xx contacts of a multizone relay like an Argo ARM-4P or a Taco SR-504. You would take a jumper from your hot lead in the relay, connect it to one side of the xx terminals. Use the other xx terminal to feed power to the aquastat.

Now when a zone calls, the relay turns on the proper pump, and power is sent to the aquastat relay, via the xx contacts, so it fires up the boiler. The high limit will still function as its supposed to. The low limit will effectively been non-functional. The boiler will operate exactly as you want it to, your just sending 120 vac when a heating zone calls instead of using a low voltage wire from xx on the relay to the tt terminals of the aquastat.

If you don't understand this, email me/post the relay model your using, I'll send you a schematic.

Hope this idea helps you and solves your problem.

Glenn

Mark_104

WIRING

Glen, Thanks for the info. Can you send me a schematic? I am using the Argo ARM-3P and the aquastat is the Honeywell L7224A.
Mark

Glenn Sossin_2

Schematic

Mark

I've done things like this before, but never with these electronic controls. I would suggest you pass this by Honeywell tech to confirm there would be no issues with cycling the power to the control like this.

Let me know how this works.

Glenn

JK_3

I just recenntly completed a simalar install for a cust. If glens schematic does not work for you I could explain how i did this with a winter/ summer power switch. it will only work from one or the other not the tank and coil together.

burnerman_2

be sure an get an experiencered one

i wanted to make a boiler cold start did it b 4 been awhile i thought u removed red from low limit then bugged to white on differental but wanted to check my h/w tech said it wasn't possile to do that i said i did it b4 he wasn't able to help so i tried it and it came on with a call 4 heat and went off at 140 hi settin i guess it can b done royboy