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Old 10-27-2012, 03:34 PM   #1
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Goodman OT18-60 all fuel board.


I want to install a Goodman All fuel board in my GMH9590 furnace. I don;s have an issue with the wiring but I do not know where or how to mount the board in the cabinet. I have been looking all over the net for a picture but couldn't find one. Any help appreciated

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Old 10-27-2012, 07:20 PM   #2
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Goodman OT18-60 all fuel board.


a OT18-60 is a outdoor thermostat for use in a heat pump outdoors. Do you mean AFE18-60A? It is Goodman's all fuel board and is mounted external to the furnace cabinet. http://www.totalairsupply.com/files/...anual_9-06.pdf
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The AFE18-60A should be installed on the side of the furnace
close to the 24Vac controls wires for field connections.
I would recommend a thermostat with a dual fuel control as part of the thermostat instead of using the all fuel board and outdoor thermostat.

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Old 10-28-2012, 04:37 AM   #3
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Goodman OT18-60 all fuel board.


Thanks . You're right I quoted the wrong model number. It is the AFE18-60A. I actually have the manual already.

The AFE18-60A should be installed on the side of the furnace close to the 24Vac controls wires for field connections.

The 24Vac connections are inside the cabinet so it seems to me it is saying it should go inside the cabinet. It just seems like to me that you would not leave a circuit board outside a box of some sort.
As far as using a Tstat that can do duel fuel control, I'm not doing that because the money is already spent and I can't take the AFE18-6A or the the outdoor thermostat back for a refund.

Last edited by kilejo; 10-28-2012 at 04:40 AM.
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Old 10-28-2012, 06:20 AM   #4
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Goodman OT18-60 all fuel board.


Mount it wherever you want. Most of the time duel fuel controls are screwed to the exterior of the return duct.
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Old 10-28-2012, 06:34 AM   #5
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Goodman OT18-60 all fuel board.


Really? Not in any kind of enclosure? How do you keep it from collecting dust? BTW Thanks. I appreciate all help given.
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Originally Posted by Marty S. View Post
Mount it wherever you want. Most of the time duel fuel controls are screwed to the exterior of the return duct.
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Old 11-08-2012, 03:33 PM   #6
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Goodman OT18-60 all fuel board.


If you are running a dual fuel heat pump/gas furnace set up, with an AFE18-60A dual fuel control board, you may want to be able to by pass the heat pump and run the furnace. These boards use an outdoor thermostat mounted in the heat pump for change over.
The problem with this set up is it is usually set to run the furnace at around 40 degrees outside temperature or less.
What happens if the heat pump fails? How can you get the furnace to kick in?
The control board does not have this ability.
The simplest way is to install a DPDT (double pole, double throw) toggle switch wired to the outside thermostat. The switch will simulate an under 40 degree condition allowing the heat pump to shut off and the furnace to run.
Wire the left side NO contacts across the NO and Com of the stat and the right side NC contacts in series with the NC of the stat and the control board. When the switch is in the down position, it is in the normal mode and in the up position, it will allow the furnace to run.
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Old 11-08-2012, 06:12 PM   #7
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Goodman OT18-60 all fuel board.


Just switch the stat to emergency heat. then the furnace will be used instead of the heat pump.
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Old 11-08-2012, 06:32 PM   #8
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Goodman OT18-60 all fuel board.


If you have a Honeywell zone controller, you can use standard thermostats because the control only outputs the y connection to the all fuel board when set up for heat pump operation. So, if you already have a system as I described, this is the only way to over ride, using a toggle switch.
You are right, however, that newer installations now utilize heat pump stats with the dual fuel capability already built in and do, indeed, have an emergency heat option, as you describe.

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