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Big Al

New Member

1

Sunday, July 29th 2012, 12:10am

Can Rain Bird 8si Operate 2 valves at the Same Time?

Hi All -

I have a Rain Bird 8si controller - currently only 7 zones in use. I am splicing into zone ONE (8 heads) after the manifold to run 5 additional bubblers in a garden.

Can I wire this thing so that zone 1 continues to operate as it does now, and a new zone 8 for the bubblers will operate the original zone ONE valve at the manifold and the new zone EIGHT valve after the splice?

I realize that for the new zone EIGHT the zone ONE valve at the manifold will also need to be open - so this probably won't work.

Opinions welcome, however!

Thank You!!

Big Al

New Member

2

Sunday, July 29th 2012, 1:01am

OK - thinking about this - maybe a better (or additional) question would be:

Can I operate the same valve from 2 different zones? In other words, can I run a wire frone Zone ONE on the controller to Valve ONE and a wire from Zone EIGHT on the controller to valve ONE? Or will the current back feed to the controller and fry it?

Thanks again!!

mrfixit

Moderator

Posts: 1,450

Location: USA

3

Sunday, July 29th 2012, 1:18am

I'm not sure why you need to do this? Can you run valve 1 on program A then a second time on program B?
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To answer your question though. Yes you can....

Big Al

New Member

4

Sunday, July 29th 2012, 1:52am

Thanks for the reply -

I never even thought of program A & B. I bought this house w/ the system in place - took me awhile to figure out the controller which isn't terribly intuitive. Seems to me though - since I'll be installing valves on the lateral lines after the manifold, that it'll have to open two valves at the same time to accomplish what I want it to. Per your response, it's capable of doing that - so thanks again!

Al

mrfixit

Moderator

Posts: 1,450

Location: USA

5

Sunday, July 29th 2012, 3:02am

One way to find out. =)
Should work.
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Just make sure you can run that many sprinkler at once... Turn two valves on manually at the same time and see what happens.

Big Al

New Member

6

Sunday, July 29th 2012, 4:03am

I don't think I explained my idea well enough, so I'll add a drawing.

I'm working on zone one only, and have an unused zone available on the controller, and a spare wire available at both the controller and the manifold.

I want to isolate the new heads and have them be zone 8, w/o running a pipe back to the manifold.

In my scenario, I wire zone one and zone 8 to both open valve #1, which is in the manifold.

For zone 1 to continue to flow the same heads as it does now, the controller would open valve 1 and valve 8. Valve 8 would be wired to zone 1.

For the new zone 8 to flow, valve 1 and valve 9 would be open, and valve 9 would be wired to the available zone 8 on the controller.

So....

Zone 1 flowing - valve 1 and valve 8 open. Valve 9 closed.

Zone 8 flowing - valve 1 and valve 9 open. Valve 8 closed.

Thw wires to the two new valves would be a separate run - easily accomplished. I have an extra wire in the harness from the controller to the manifold to operate valve 1 using the zone 8 slot, which is currently unused.

I hope this makes sense. And thanks again for looking.

Al


Wet_Boots

Supreme Member

Posts: 4,028

Location: Metro NYC

7

Sunday, July 29th 2012, 8:17am

If you intend to split a zone by adding two more zone valves in the field, the original zone valve gets connected to the Master Valve terminal of the controller.

Big Al

New Member

8

Sunday, July 29th 2012, 11:20am

If you intend to split a zone by adding two more zone valves in the field, the original zone valve gets connected to the Master Valve terminal of the controller.
Thanks for the reply - I think I understand.

So in my case, I would move the wire from zone 1 at the controller to MV. I assume this valve would be open when the program is running and closed when not running.

I would then wire valve 8 to zone 1 and valve 9 to zone 8?

Thanks again!

Wet_Boots

Supreme Member

Posts: 4,028

Location: Metro NYC

9

Sunday, July 29th 2012, 1:57pm

you got it - some controllers have the ability to assign the master valve to operate only when specific zones are activated

Big Al

New Member

10

Sunday, July 29th 2012, 4:55pm

Thank you for the help! Now back to digging :(

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