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Author Topic: How to control a 5000 Watt electric heater ?  (Read 1253 times)

Offline goldriver

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How to control a 5000 Watt electric heater ?
« on: November 07, 2015, 10:10:08 am »
I am looking at how  I could integrate my 5000 watt garage heater to my z-wave network.

I found out that it could be done with an Aube rc840t-240 relay and a Honeywell rth9580wft thermostat.

I have found this diagram about connection
http://www.aartech.ca/blog/wp-content/uploads/2015/07/rc840t-240.png

But I'm unsure how the tstat must be configured to correctly work with this configuration, should I configure it as :
1- Forced Air
2- Heat Pump
3- Hot water or steam

Am I right to assume I will only be using the C,W and R wire on the thermostat ?

Thanks for any help

Offline RichardTSchaefer

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Re: How to control a 5000 Watt electric heater ?
« Reply #1 on: November 07, 2015, 11:11:59 am »
For heat only it does not matter.
C - Common  (Needed for Device Power) 
R - Power -
W - Heat Requested  (When thermostat calls for heat (in all three modes) the R and W are connected.

Those modes pretty much control the 
Y - Cooling
G - Fan 
XX - Other wires

Actually you should use Forced Air or Hot water/steam
Otherwise there might be a couple of deg difference between when the R-W are connected. It might treat this as the emergency heat in a multi-stage heat pump.
« Last Edit: November 07, 2015, 11:15:02 am by RichardTSchaefer »

Offline goldriver

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Re: How to control a 5000 Watt electric heater ?
« Reply #2 on: November 07, 2015, 05:18:53 pm »

Thank's again Richard, I'm actually building a secure box for the connection and the relay and I should try the setup tomorrow.