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.

leonz

The piping to both boilers needs to be removed back to the boilers and reinstalled correctly.

Jamie Hall

I still don't know what is controlling the oil boiler… or what wires are connected to what on the 70200S.

Please…

Chocolyle

@Jamie Hall this is the wiring at the burner. I appreciate your input, sorry I have been tied up with work.

Below the burner pic, main house valve (wood boiler no thermostat, connects to Honeywell aqua stat), second valve (wood boiler has a thermostat). Oil boiler thermostats connect in the 3250 Hydrostat top left terminals.

EdTheHeaterMan

This is the wiring diagram for the Peerless boiler

This is the wiring diagram for the zone valves.

This is how I would put the two together.

What I don't know is what the Honeywell L6006 (L4006) Aquastat on the wood boiler is connected to

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Jamie Hall

Ah… do I see a jumper across T-T? Jumping those two terminals is the call for the burner to run. As long as they are jumped and the burner has power, it will run. Could this be why yours is running all the time?

It's just doing what your wiring has told it to do…

Why is that jumper there?

EdTheHeaterMan

The pipes that connect the wood boiler to the Peerless boiler are also a mystery?!?

Here is the recommended piping for the Peerless boiler with 2 zones.

I can not tell if your boiler is piped this way, but it should be similar

This is how i would connect the wood boiler to keep the Peerless boiler hot enough to make hot water. Then when the wood fire is no longer sufficient to maintain DHW minimum temperature, the wood stove circulator should stop and the oil burner can take over automatically by the aquastat if properly wired.

EdTheHeaterMan

https://forum.heatinghelp.com/discussion/comment/1845890#Comment_1845890

The Jumper is factory installed by Peerless in order to operate the burner for DHW demand. the thermostats are connected to the TripleAquastat for space heat circulator to operate. Boiler maintains temperature for the tankless coil.

Until the tankless coil is abandoned for another DHW source, the jumper must stay.

When the DHW coil is abandoned, the Jumper must still stay but the Triple Aquastat can be adjusted to become a cold start boiler by turning the Low Limit to OFF.

EdTheHeaterMan

If the Wood Boiler was piped as I illustrated, then the B1 from the Triple Aquastat can be connected to the Wood Boiler Aquastat common and the Make on Temperature Rise R B contacts can direct the power to the circulator pump. The make on Temperature Fall R W contacts can be directed to the oil burner. That will make the wood boiler operation automatic and there will be no need for a manually operated switch

That may be less expensive than a separate water heater, and also cost less to make DHW while the wood stove is heating the home. Of course that depends on where the firewood is sourced? Owner owned trees, cutting, and splitting or paying for wood delivery.

Chocolyle

Thank you. Very clear explanation @EdTheHeaterMan

Jamie Hall

Fair enough, @EdTheHeaterMan — but then the aquastat must be wired to turn off the oile burner when it's happy. Which it isn't. And — perhaps I'm missing something — wouldn't shutting off power to the burner using the aquastat eliminate any post purge?

hot_rod

It's really the piping that dictates how the control has to function. With a tankless coil in the boiler, it needs to stay hot.

Grallert

I would check where L1 and B1 from the Hydrolevel are connected to that Carlin control.

EdTheHeaterMan

https://forum.heatinghelp.com/discussion/comment/1845928#Comment_1845928

I am not sure that my idea on how the system is wired, is how it IS wired. I'm just saying that is how I would do it, but only if the piping is designed to feed the boiler with hot water from the wood stove. If they are piped as a primary/secondary or some other configuration where the oil boiler is not heated by the wood stove. then I may design the controls differently.

Regardless, the oil boiler needs to maintain 160° or there about in order to have enough DHW. That is why the burner keeps operating regardless of the call for heat situation. And I can't be sure that the zone valves are properly wired, the explanation given about thermostat, no thermostats, and I don't know what a 24 VAC oil PS actually is. That's all somewhat cryptic.

I'm not sure the OP actually knows what they have.