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[hondaracer2oo4]

Sounds good, thanks for the help!

[hondaracer2oo4]

Ok, unfortunately I am in need of little more help. So I have a Honeywell R8184G boiler control. It has two inputs, T T for thermostat and the F F for the eye. What wires on the output of the controller do I run out to the relay?

[RSI]

Oh, I forgot you don't get access to the C connection on an oil burner control. You would need to get inside the control to get the other point needed to run the relay.

You could connect a transformer to the output of the control but you might as well just use the fan power like you originally wanted to do.

Since you are just running a relay, the smallest 24v transformer should work fine.

[slimjim]

Honda, I thought you said you have a forced hot air unit? Either way the drawing that I posted will work with another relay.

[hondaracer2oo4]

Slim, Yes my oil burner is FHA. The 501 control would work to cut the pump when the oil burner runs, although it is a little pricey($50) for just being a relay and a transformer. I can get the two of those for about $20 total instead.

[slimjim]

OK you threw me off a bit with the control when you said boiler control, Did you understand the drawing, look at the TT wiring as one continuous loop, when the thermostat makes connection (calls for heat) it simply completes the circuit.

[hondaracer2oo4]

Slim, yes the 501 will very much work for the situation, just run the thermostat wire out to the 501 on the owb then back to the boiler to complete the circuit. Couldnt I just split the thermostat wire in the house though and run one set to the 501 outside and the other set to the burner control?

[RSI]

Ok I can understand that theory, can you run a TT wire out to the boiler? if so this will work

I am not sure if I am looking at your diagram right. What connections on the Taco 501 do you have the TT wires connected to? If the TT wires, you are running the transformers and relays in series which doesn't seem like a good idea. It will be 48V between them and if it gets wired wrong could burn out the control on the oil burner or the taco relay or both.

Another thing with running the circuit like that is if something happens to the wiring or Taco relay you will lose the oil heat.

If you want to use that relay, I would use a relay with a 120v ac coil and connect it to either the blower power or the output of the Honeywell control.

[slimjim]

I'm having trouble seeing that inside my head RSI, could you draw it for me?

[RSI]

It looks like you might be able to connect a relay from the 2nd T to the bottom F connections and make it work. I am not sure if anything would get backfed though. It is probably best to just use a separate transformer.

[RSI]

I'm having trouble seeing that inside my head RSI, could you draw it for me?

I can try.

[hondaracer2oo4]

I guess this was more complicated then everyone thought? I figured however it is done is common practice with anyone with a FHA oil burner since they need to have some way of cutting the pump when the oil burner is firing or you will get little to no heat out of the vents.

[RSI]

I'm having trouble seeing that inside my head RSI, could you draw it for me?

Not sure if this will help.

[RSI]

I guess this was more complicated then everyone thought? I figured however it is done is common practice with anyone with a FHA oil burner since they need to have some way of cutting the pump when the oil burner is firing or you will get little to no heat out of the vents.

Just putting a transformer on the fan power like you suggested earlier will be simple. It will supply 24v whenever the blower comes on. Then you just run the 24v straight to the coil on the relay. You will need to make sure the power isn't backfed to that point when the OWB thermostat calls for heat. If it does, it will turn your pump off when the OWB thermostat calls for heat.

If that happens, you will need to connect to the output of the oil burner control instead.

[RSI]

If you want to use the Taco 501 relay, this is how you would hook it up except the pump would connect to the NC instead of the NO as shown. (TT on boiler would be TT on your oil burner)

I think separate relay and transformer would be easier and you would only need to run 2 wires instead of 4 like this.