Fan only for Regal oil-air furnace & Honeywell thermostat

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Old 11-15-12, 04:41 PM
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Fan only for Regal oil-air furnace & Honeywell thermostat

Have an old farmhouse,
About 10 years ago added Regal oil-hot air furnace with with Honeywell Beckett / R7184 controler.

About 1 year ago, changed out antique round Honeywell mercury 2-wire thermostat for programmable Honeywell RTH221 thermostat.

Reused ancient 2 wire connection to new HYW 221 thermostat,
thermostat to 3/T and 4 on controller.

Well, the H-221 thermostat has "fan auto" and "fan on" settings, just go around to thinking about how to get them working for the blower.

The furnace has partial control of the blower - when the furnace is on.

To actually use the "fan on / fan auto" controls to turn the blower on and off,
I'd guess it is necessary to run a "green wire" from the thermostat which bypasses the furnace, and goes directly to the blower fan?

Anybody else worked on controling the blower fan for an oil hot air furnace, seperate (or actually in parallel to) the furnace control?

Hal
 

Last edited by Hal_S; 11-15-12 at 05:26 PM.
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Old 11-15-12, 05:20 PM
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First confirm that your furnace will even allow manual control of the "fan" ( i.e. blower ).

If you had extra wires, do you even have a place to connect them on the furnace?
 
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Old 11-15-12, 06:10 PM
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Originally Posted by NJ Trooper
First confirm that your furnace will even allow manual control of the "fan" ( i.e. blower ).
If you had extra wires, do you even have a place to connect them on the furnace?First

Yes, duh,
I've got a REGAL ECM, a system that generally supports constant fan settings,
why else would I bother asking...

From the quick response, I assume you have worked on one of these?

So, NJ or anybody, what exactly is involved in enabling constant fan mode on these things?

Hal
 
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Old 11-15-12, 08:10 PM
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From the quick response, I assume you have worked on one of these?
Duh... no, I despise scorched hot air systems. My quick response was to move your post to the correct forum.

Do you have the manual for the boiler?

I'm sure that all you need to do is pull a new thermostat wire set and make the connections. Duh.
 
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Old 11-16-12, 10:22 AM
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Originally Posted by NJ Trooper

Do you have the manual for the boiler? ... Duh.
-------------------------
No, of course not.
-------------------------

Back to the question, anybody have any experience with Regal ECM hot air furnace?
 
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Old 11-16-12, 04:47 PM
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So, found the answer to my own question,
I'm replying to myself in the hopes that this may help somebody with the same question.

Question - can a Honeywell RTH221 thermostat control fan-on/fan-auto on a Regal oil hot air furnace that has a Honeywell/Beckett R7184B controller?

Answer - Not really.

By default, the RTH221 thermostat's fan control is disabled so the oil burner controls the fan. This can be changed via the RG / RE jumper, but you'll need to get a green control wire to the fan controller.

By default the R7184B oil burner will be wired to take control of the fan for a 45 second fan delay while the oil burner preheats.

By default, the Regal furnace will have the fan controller wired so that the oil burner controls the fan.

So, while it may be possible to enable fan control, that would require changing the thermostat, the oil burner and the fan controller - AND it will disable the furnace pre-heat cycle which is likely why you opted for a 7184 controller in the first place....
 
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Old 06-08-13, 07:59 PM
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Bump - found the anwer, and part number.

The R7184 controller design works with an A/C terminal block and transformer, the Beckett 51950U.

Allows a/c control, and fan control.
 
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