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tlloydusmc 11-03-2012 02:39 PM

Disable Emergency Heat On Digital Thermostat
 
What is the code, and proper setting, to disable the Emergency Heat on an American Standard ACONT800 Digital Thermostat? I found an install manual that has some basic codes but it does not provide the three digit EMHEAT code.

I want to run my heat pump off of my generator -- no issue there. But the air handler is on a 60AMP breaker to accomodate the electric furnace. I don't need the furnace/EMHEAT, but I do need the airhandler blower to run without the possibility of the EMHEAT kicking on and overloading my generator.

Thanks.

beenthere 11-03-2012 08:11 PM

There is no code to disable the aux heat. However, you can get an outdoor temp sensor and lock out the aux above X temp. So when your power goes out, you just set the lock out temp below current temp by 5 or 10 degrees.

hvacjunkie 11-03-2012 09:23 PM

you could just disconnect t stat wire for aux/emergancy heat from the t stat base

hvactech126 11-04-2012 09:21 AM

Quote:

Originally Posted by hvacjunkie (Post 1044228)
you could just disconnect t stat wire for aux/emergancy heat from the t stat base

you would also have to disconnect it at the heat pump so that it doesn't call during defrost. The best option is to disconnect the w1,w2,w3 wire(s) at the air handler.

tlloydusmc 11-04-2012 09:49 AM

Quote:

Originally Posted by hvactech126 (Post 1044473)
you would also have to disconnect it at the heat pump so that it doesn't call during defrost. The best option is to disconnect the w1,w2,w3 wire(s) at the air handler.

Thanks! If I disconnect the W1, W2, W3 wires, will the system still defrost properly? If not, can I leave the "W" connections in place and just disconnect the power source connector inside the air handler to the heater strip? Will disconnecting this source have other unintended consequesnces? I just want to stop the electric heat from firing up without adversely affecting other system operations.

beenthere 11-04-2012 11:39 AM

If you disconnect the power to the heaters. then when it defrost you get nice cold air blowing out the registers for 5 to 15 minutes while it defrost. Some people don't mind that, others do.

hvactech126 11-04-2012 05:56 PM

Quote:

Originally Posted by tlloydusmc (Post 1044494)
Thanks! If I disconnect the W1, W2, W3 wires, will the system still defrost properly? If not, can I leave the "W" connections in place and just disconnect the power source connector inside the air handler to the heater strip? Will disconnecting this source have other unintended consequesnces? I just want to stop the electric heat from firing up without adversely affecting other system operations.


As BT stated it will defrost just fine it is just that the air put out from the AHU during defrost will be cold. But this is the ONLY way to keep the strip heaters from turning on while running on the generator so it would be worth it in my opinion. Defrost does not happen that often unless there is something wrong with the system.

tlloydusmc 11-04-2012 06:55 PM

Thanks BT & hvactech. I can live with some cold air...will disconnect W-1, 2 & 3 at the air handler. Apprceiate the assist.


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