Jensen indoor Wood Boiler w/Hydronic Oil - Oil runs all the time?

Chocolyle

Hope someone can point me to the obvious on this one.

Oil boiler, 2 valve/zones, single circulator, two thermostats, heat only.

Jensen wood boiler, single circulator, Honeywell aquastat, light switch to turn on the circ and another for a draft fan.

We bought the house this past June and it came with. The issue is when we have the wood boiler on and burning the oil boiler keeps going on, going through a lot of oil because.

Wood boiler, originally, was tied to the 24VAC oil PS through the Aquastat to the first valve to open it when on. No thermostat for the first zone. Circulator turns on when the light switch is turned on, even though no fire is burning.

I did add another therm in the master bedroom, the main part of the house would be 80+ but the bedrooms would be 64, the far bedroom would get much lower. That one is set to to 74 and it does hit that point and cuts out at setting.

Pipe, wood boiler has a single circuit through it, I can bypass the wood boiler with two valves. Wood boil goes through the main in and out of the oil boiler. Temp inside the oil would stay high, I would think.

If we are only using the oil 24V PS to open and close the valves, why would the oil keep firing? The two thermostats connected to the oil are set to 65 and both shows the two zone areas at 80+ and 74.

Thank you for any help.

Jamie Hall

What is controlling the oil burner? What connections are there on the control (the Carlin 70200S) box? I can't really make out the photo…

Chocolyle

Just 2 thermostats, main house and MBR. It does have a built in on-demand water heater. When the wood boiler is off, it will occasionally fire to keep the water ready. When the wood boiler is circulating though it fires much more often.

The only interconnect between the two is water and the electronic valve connections.

hot_rod

the tankless coil for DHW in the oil boiler will require it to be hot all the time

So they are probably piped in series

When the wood boiler is not fired the oil boiler will be heating it and a % of your oil heat is going up the wood boiler flue

Another way you make your dhw would be helpful

Grallert

What is the temp of the oil boiler while the wood boiler is firing? I don't see in the pictures but does the wood enter the return side of the oil travel the heating circuit and return to the wood boiler?

Chocolyle

Temp of the oil boiler is 175. Wood boiler returns to the oil into the lower rear inlet. Loop back to the wood from the oil is branched off the circuit or the 2 zones.

Front lower is the return for the hydronic baseboard zones.

Chocolyle

At some point we will have propane DHW, we have a 300 gallon tank for propane. Genset too.