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Author Topic: Thermostat control of forced air and oil boiler  (Read 355 times)

slimjim

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Re: Thermostat control of forced air and oil boiler
« Reply #15 on: September 10, 2017, 06:09:41 PM »

Ok so let's work on the temps a bit, let's bring up the wood boiler, and drop the oil boiler interrupt Aqua stat temp by about 5 degrees each and see what that does.
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Wood boiler sales, service and installation for the Northeastern USA.

hondaracer2oo4

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Re: Thermostat control of forced air and oil boiler
« Reply #16 on: September 10, 2017, 06:26:08 PM »

Wellll I can't turn the oil boiler aquastat down, it is a fixed temp I believe?
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slimjim

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Re: Thermostat control of forced air and oil boiler
« Reply #17 on: September 10, 2017, 06:28:53 PM »

You should be able to go as low as 140 I believe on the oil boiler Aqua stat but I'm after the interrupt Aqua stat, that drops way down if you like on the Ranco or honeywell
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hondaracer2oo4

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Re: Thermostat control of forced air and oil boiler
« Reply #18 on: September 10, 2017, 06:46:05 PM »

Yeap you were right, the Honeywell oil boiler Honeywell aquastat does adjust the high limit, with a fixed diff of 8. So you think I Should try dropping the high limit on the oil boiler and then raise the temp that the owb needs to reach before the oil boiler stops running?
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E Yoder

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Re: Thermostat control of forced air and oil boiler
« Reply #19 on: September 11, 2017, 03:01:40 AM »

Now that I thought about it I have come to the conclusion that it won't work. The reason why it won't work is that the ranco would never know when the owb comes back up to temp so that it automatically swaps back to the owb and kills the oil boiler.
yes, I it should be on the incoming line. I thought it sounded like it was on the primary loop perhaps.
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slimjim

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Re: Thermostat control of forced air and oil boiler
« Reply #20 on: September 11, 2017, 04:19:17 AM »

No, drop the temp on the oil boiler interrupt Aqua stat, at 160 I think you are very close to the low or cut in setpoint of your wood boiler then if anything raise your oil boiler Aqua stat a bit so it will not turn the injection circ on as quickly and shut it off sooner. Do you have a shut off on your plate exchanger before the oil boiler Aqua stat?
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hondaracer2oo4

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Re: Thermostat control of forced air and oil boiler
« Reply #21 on: September 11, 2017, 04:32:00 AM »

Alright I am in the same page now. I will Give that a try. Yes I have a ball valve between the plate exchanger and the ranco sensor. I could shut that off when the owb isn't running to separate the two systems. I just wanted to make things totally automatic and intergrated if possible.
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slimjim

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Re: Thermostat control of forced air and oil boiler
« Reply #22 on: September 11, 2017, 04:35:42 AM »

Without using a zone valve, and the larger ones get expensive, you are about as automated as you can get.
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Wood boiler sales, service and installation for the Northeastern USA.
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