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Old 10-25-2012, 11:06 AM   #1
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Correct way to wire electrical relay ?


Hi,

I want to install a low voltage thermostat to control a fan-forced heater (5000W). I will need to install a relay and I wanted to make sure my wiring is correct.

I will go with the following relay:
Product page: http://www.aubetech.com/products/pro...=42&noLangue=2
Install manual: http://www.aubetech.com/manuel/2/RC840T.pdf

Here's my wiring diagram:

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Old 10-25-2012, 11:18 AM   #2
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Correct way to wire electrical relay ?


Based on the manual link you have it wrong. You need to swap the blue and red wires coming out of the stat. The blue and black need to go to the line coming in.

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Old 10-25-2012, 12:27 PM   #3
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Correct way to wire electrical relay ?


Quote:
Originally Posted by joed View Post
Based on the manual link you have it wrong. You need to swap the blue and red wires coming out of the stat. The blue and black need to go to the line coming in.
Like this:

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Old 10-25-2012, 12:30 PM   #4
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Correct way to wire electrical relay ?


Your wiring will cause a dead short across the incoming power when the thermostat turns on. Not good - will probably kill the relay. Switch blue and red, as joed says.
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Old 10-25-2012, 12:46 PM   #5
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Correct way to wire electrical relay ?


connect one line feed thru the N.O. contacts on that relay so the stat closes that N.O. to cycle the heater
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Old 10-25-2012, 02:12 PM   #6
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Correct way to wire electrical relay ?


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Your wiring will cause a dead short across the incoming power when the thermostat turns on. Not good - will probably kill the relay. Switch blue and red, as joed says.
Thanks for the advice. So my second wiring diagram is correct ?
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Old 10-25-2012, 02:55 PM   #7
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Correct way to wire electrical relay ?


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Originally Posted by westbank View Post
Thanks for the advice. So my second wiring diagram is correct ?
Looks like it, yes.
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Old 10-25-2012, 06:21 PM   #8
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Correct way to wire electrical relay ?


Yes second diagram looks correct.

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