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🔌General Home Automation => Automating Your House => Topic started by: Pete S on July 04, 2008, 11:05:42 AM

Title: interface a Honeywell T8011R thermostat to a "PowerFlash" (PF284) module
Post by: Pete S on July 04, 2008, 11:05:42 AM

Does anyone know how to  interface a Honeywell T8011R thermostat to a "PowerFlash" (PF284) module? I need pin-for-pin instructions.

Thanks,

Pete S

Title: Re: interface a Honeywell T8011R thermostat to a "PowerFlash" (PF284) module
Post by: Walt2 on July 04, 2008, 01:56:06 PM

To do what?

The T8011R is a two stage, heat pump thermostat.  So, we are taking about emergency heating, regular heating, A/C, and fan control.  Which one of those functions, would you want to connect to the PF284's input?

Title: Re: interface a Honeywell T8011R thermostat to a "PowerFlash" (PF284) module
Post by: Pete S on July 07, 2008, 09:48:51 AM

Thanks for your response.

I'd like to send an X10 signal when the temperature drops below the setpoint. The thermostat is not in use now and would be used only for this purpose. Thanks again.

Title: Re: interface a Honeywell T8011R thermostat to a "PowerFlash" (PF284) module
Post by: Walt2 on July 07, 2008, 08:46:53 PM

I would suggest using the thermostat's FAN control.  The FAN is always turned 'on' whenever the thermostats "calls" for something (heat when in heat mode, A/C when in cooling mode).

The thermostat you picked is electronic, so it needs a power supply (it isn't a simple mercury switch).   You need to connect a +24v power supply between screws R and C.

The thermostat's outputs, unfortunately, are all a bit too high of a voltage to connect directly to the PF284.   You might need to get a small relay with a 24v coil voltage.  Connect the coil side of a relay to the fan output G and C.  The contact side of the relay then connects up to PF284.