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Old 04-13-2012, 01:28 PM   #1
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Want to replace Intermatic mechanical timer with electronic. Help


Hello
I will also post this in the electrical forum, but since it has to do with irrigation, I try here as well.

I recently installed sprinklers, and the contractor installed an Intermatic R8816P101C timer, which is connected to a rain sensor. I want to replace it with a digital EH40 in which I can program whatever time period I want, etc ,etc. I've looked at the wiring diagram (see attached) to see how the rain sensor would connect to the EH40, but I dont see a clear answer. Two wires for line, 2 for load, but where would the rain sensor wires get connected to the EH40?

If anyone has any suggestions, kindly reply.
Thanks
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Old 04-13-2012, 01:38 PM   #2
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Want to replace Intermatic mechanical timer with electronic. Help


One post per issue please, otherwise it gets too confusing and oh'mike gets all perplexed and then there's just NO communicating with him for DAYS! The rest of us just go sit in the corners and pick our noses and daydream about gorgeous women.
2nd thread moved to trash. You'll get your answer here, no problem. If not, we'll be happy to move this post to Electrical.

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Old 04-13-2012, 07:58 PM   #3
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Want to replace Intermatic mechanical timer with electronic. Help


This needs to go to electrical----moving it--oh'mike---
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Old 04-13-2012, 08:16 PM   #4
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Want to replace Intermatic mechanical timer with electronic. Help


You can't connect the rain sensor to the EH40, it's not the correct type of timer. It's designed for a water heater.

The R8816p101c is designed for irrigation. That's why you see the "rain sensor" contacts on it.
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Old 04-13-2012, 08:25 PM   #5
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Want to replace Intermatic mechanical timer with electronic. Help


I don't know much about sprinkler systems, but it looks as if the original timer was built for sprinkler systems, but when I type the EH140 into Intermatic's website, they list it as a water heater timer. The EH140 is just a line in/line out timer. I don't think you can directly change out the first timer with the second without other modifications.
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Old 04-13-2012, 08:31 PM   #6
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Want to replace Intermatic mechanical timer with electronic. Help


yes, the eh40 is a watee heater timer that obviously doesn't have connectors for a rain sensor. I was looking for some ingenuity in connecting the rain sensor wires.
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Old 04-13-2012, 08:55 PM   #7
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Want to replace Intermatic mechanical timer with electronic. Help


Just set the mechanical timer to "ON" and use the digital timer in line before the mechanical timer, since it has the rain sensor input terminals.
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Old 04-13-2012, 09:02 PM   #8
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Want to replace Intermatic mechanical timer with electronic. Help


The problem with that is that the EH40 is powered by 240V.

But I saw they made a similar timer, EH10, that would work.
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Old 04-13-2012, 09:05 PM   #9
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Want to replace Intermatic mechanical timer with electronic. Help


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Originally Posted by theatretch85 View Post
Just set the mechanical timer to "ON" and use the digital timer in line before the mechanical timer, since it has the rain sensor input terminals.
good thinking. unfortunately both wont fit in the box.
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Old 04-13-2012, 09:07 PM   #10
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Want to replace Intermatic mechanical timer with electronic. Help


The mechanical timer says its compatible with 120 volt input or 208-277 volt input. It would depend on the circuit wired for the mechanical timer (since it sounds like it's already installed) if its wired for 120 volt or 240 volt. Either way the 120 volt or 240 volt digital timer would control the power to the mechanical timer.
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Old 04-13-2012, 09:08 PM   #11
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Want to replace Intermatic mechanical timer with electronic. Help


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good thinking. unfortunately both wont fit in the box.
Can you put the digital timer in line inside or locate it somewhere else near the mechanical timer? Or if its a dedicated circuit it could go near the electrical panel?
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Old 04-15-2012, 01:36 PM   #12
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Can you put the digital timer in line inside or locate it somewhere else near the mechanical timer? Or if its a dedicated circuit it could go near the electrical panel?
this is worth exploring. The mechanical timer has its own dedicated 240v circuit. I could locate the box for the digital timer (in its own box) and connect it with PVC to the mechanical box. From digital timer load to mechanical timer line input.

Hmm..sounds insane and perhaps not worth the hastle. My only reason for wanting to use the digital is to avoid the forced 12min per golden peg constraint. Not a big deal. I have the EH40, its digital, and I was looking to use it. That is all.

Thank you all

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