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Tool Talk Discussion Forum

Re: House boiler question HVAC experts?

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Author  [Modern View]

11-24-2013 16:40:53

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Hello Bob, Now I'm still confused. I got the documents for the L8124A,C aquastat, the nearest schematic to my system is figure #7 which shows 2 t-stats and 1 circulator. However my system has a separate 24 volt "doorbell" transformer that powers the zone valves and t-stats in a cluster f*^% of wiring that looks like a 10 year old could have done better, but it has worked dependably for 28 years. 2 wires come out of this cluster to the T and T terminals in the aquastat.
Terminals ZR and C2 are not used on my system. The schematic shows B2 and C2 tied together to L2. Can you un-confuse me?

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11-25-2013 07:59:19

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 Re: House boiler question HVAC experts? in reply to s.crum, 11-24-2013 16:40:53  
1. What do you have the "low limit" set at? That is the setting that controls the temp of the boiler when there is NO call for heat. Setting it as low as it goes (just over 100) will keep the boiler's standby temp as low as possible WITHOUT any electrical changes.

2. See diagram...

3. If you can disable that internal connection, the burner will only run when a zone valve is "open". From a cold start, the burner will fire when a zone valve opens and the circulator will NOT start until the boiler reaches the "low limit" setting. (This is for quicker heat exchange warmup to reduce moisture/acid/soot buildup in the heat exchanger.)

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11-25-2013 13:32:46

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 Re: House boiler question HVAC experts? in reply to Bob, 11-25-2013 07:59:19  
Ok thanks! I will look into this again on Wednesday.

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