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Old 07-15-2010, 06:08 AM
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AI Inc AI Inc is offline
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tieing in before the pressure switch

Looked at a tough one the other night.Split level, as usual , the water source was under the landing. Front steps s foot wider then landing. Finished basement to the righ of landing.Copper feed going to the tank and switch cross the garage. Real easy place to do the tap. I asked a well guy and he said If I move the check valve to before my tie in I would be fine. Otherwise the switch would not know when to turn the pump on. Anyone ever do it?
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Old 07-15-2010, 08:18 AM
Some Sprinkler Guy Some Sprinkler Guy is offline
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I have not done it but have heard it will make the pressure switch work incorrectly.

Seems to me when a zone kicked on or off it will make the switch read errantly.

Let us know what happens.
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Old 07-15-2010, 08:23 AM
Mdirrigation Mdirrigation is offline
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Well guy is correct , add another shut off for the main if one is not there .
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Old 07-15-2010, 09:26 AM
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The only thing at all hinky about such a setup is that there will be some 'reverse' flow in the segment of pipe between the tank and your tie-in.
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Old 07-15-2010, 08:24 PM
Mdirrigation Mdirrigation is offline
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To stop any reverse flow , put a swing check upstream of the sprinkler supply line .
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Old 07-15-2010, 10:52 PM
Some Sprinkler Guy Some Sprinkler Guy is offline
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Quote:
Originally Posted by Mdirrigation View Post
To stop any reverse flow , put a swing check upstream of the sprinkler supply line .
As soon as the system comes on the pressure drops to 0 then the pump kicks on? By having two check valves you are running the well without a pressure tank. Maybee I am missing something here.

To the OP, be sure to let us know how this goes.
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Old 07-16-2010, 06:36 AM
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Quote:
Originally Posted by Some Sprinkler Guy View Post
To the OP, be sure to let us know how this goes.
The more I think about it, the more I want to tap after and just plumb back to the garage and out.
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Old 07-16-2010, 06:37 AM
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Quote:
Originally Posted by Mdirrigation View Post
To stop any reverse flow , put a swing check upstream of the sprinkler supply line .
would that not fool the PS to thinking that there was no demand?
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Old 07-16-2010, 07:06 AM
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No check valves between POC and pressure tank in this arrangement. You live with the reverse flow.
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Old 07-16-2010, 08:39 AM
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Sprinkus Sprinkus is offline
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Could possibly cause the pressure switch to chatter.
If I were to tap in like that I would move the original check valve and then add one on the sprinkler supply.
I'd say go for it. Worst case scenario is that it won't work or maybe cause some serious water hammer.
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