Honeywell r7284u doesn't shut down the oil furnace

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Old 04-23-18, 10:33 PM
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Honeywell r7284u doesn't shut down the oil furnace

Hi Everyone,

I need help installing an R7284U primary oil furnace control. I saw another post on this forum that actually matches my situation exactly: https://www.doityourself.com/forum/g...ting-down.html

There is no solution posted in the post above.

I have an old control I would like to replace on a hot air oil furnace. The two wires from the thermostat are connected to TT terminals on the control. L1 (black) and limit (red) wired together to black (power). L2 wired to motor, ignitor and neutral wire. Blue ignitor wire to ignitor, orange motor wire connected to black wire from motor.

The R7284U is in furnace mode. When I flip the power switch, the control powers up, goes into standby and after that fires the burner. If the desired temperature is reached or I lower the temperature on the thermostat, the thermostat clicks off but the furnace stays on, it doesn't turn off.

I tried to reconfigure the TT option to 'on' and to 'off' and it doesn't help.
There is no aquastat controller. All the diagrams in the manual show aquastat controller.

I tried to disconnect the limit and the control just shows standby and doesn't fire the burner.

Please let me know if you have any suggestions.
Thanks for the help!
 
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Old 04-23-18, 11:33 PM
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Welcome to the forums.

There are diagrams for oil forced air too.

What happens when you remove the TT wires..... does it still fire ?
Make sure there is no jumper on TT,
If yes..... something is not correct in programming.

Opening the limit circuit will cause the burner to not run and is normal.
 
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Old 04-24-18, 06:39 PM
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ok. Thank you. I will try it tomorrow and report back.

There is no jumper on TT. In the installer setup there is an option TT CONFIGURED ON.
The choice is YES or NO. It is not clear which one activates the jumper and which one gives you the thermostat controls.

Fig 10 shows the diagram for oil fired forced air system.
Burner, Ignitor, Cad Cell, L2 (neutral wire), L1 is power.

Limit is not connected?

Thanks.
 
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Old 04-24-18, 07:23 PM
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Gas is my specialty..... not oil systems.

I would think TT on is correct but I'm not 100% sure.
I was under the impression that if a limit is not connected..... the burner won't run.
 
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