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larrymul

New Member

Posts: 3

Location: Richland, Washington

1

Wednesday, April 24th 2013, 1:53pm

Heads only pop after second attempt

I have replaced an existing above ground/surface system with all
in-ground heads, 8 zones, existing one inch main, 1/2 inch funny pipe to
heads. Irritrol Rain Dial-R controller, valves brand and model is unknown. I
don't see any pressure reducing devices in the system and zone valves do
not appear to be adjustable.

Plenty of pressure, dedicated City irrigation system. Nine times out of ten, when activated either by
timer, manual at the controller or at the valve, heads will pop an inch
or so and dribble. Turn off and restart them, they pop with lots of
pressure and stay on normally. This happens with Orbit spray heads in 7
zones and my RainBird impact sprinklers in another. Age of the system is
unknown, home is new to me last December and irrigation system was just
activated this week by the City. Previous owner is not available.
I re-made all wire connections at the valves, clean and tight.
Can anyone identify the two types of valves? I'm thinking of changing solenoids if I can find what these are.
I'm anxious because I just had my entire property hydro seeded, which
requires frequent watering, like every two hours for 15 minutes each
zone, 8 zones.

I don't get it, the part time operation. Yesterday they cycled and ran just fine for six start times.

I checked voltage at the controller, 26 VAC to the valves. Is it possible
the solenoids aren't opening fully at the first hit and the second try
opens them further? Just thinking outside the box...

I also checked my irrigation system pressure, steady 50 psi.

I'm currently searching this site.

Any ideas? Thanks!
larrymul has attached the following files:
  • P4230212.JPG (15.32 kB - 38 times downloaded - Last download: Oct 15th 2013, 10:52am)
  • P4230213.JPG (15.07 kB - 38 times downloaded - Last download: Oct 15th 2013, 10:52am)
  • P4230214.JPG (16.29 kB - 38 times downloaded - Last download: Oct 15th 2013, 10:52am)

This post has been edited 1 times, last edit by "larrymul" (Apr 24th 2013, 2:54pm)


Central Irrigation

Supreme Member

Posts: 347

Location: Central Minnesota

2

Wednesday, April 24th 2013, 3:40pm

Check the resistance of all selonoids from the controller. The majority of your valves are Irritrol 2400s. I cant make out the first picture from my phone, but also appear to be Irritrol or Richdel valves. Either way, healthy wiring and selonoids should yield somewhere between 20-30ohms per circuit, for those valves.

Are you able to isolate the trouble zones? Or, is it all zones?

larrymul

New Member

Posts: 3

Location: Richland, Washington

3

Thursday, April 25th 2013, 10:43pm

Thanks for the reply. It's random and in all zones. For instance I can run my program, have 55 psi incoming, first zone opens, pressure on the main system drops to zero and the water just pukes out of the heads. Shut the controller off, run a zone manual from the controller, comes on fine, system pressure holds at 40 - 50 psi. Sometimes opening a zone at the valve works, sometimes not. I'm not losing system pressure from the city. It's a city provided, separate irrigation system, pressurized. I probably mentioned it earlier, I've shut off all heads in a zone, activated it, holds the system pressure, and no signs of any leaks coming up anywhere after half an hour in that state.

I've already had a sprinkler contractor here after the city turned on the system a couple weeks ago to repair a line my concrete contractor drove a form spike through, the system worked great when he left. The next day same old stuff happening. I'm afraid I may have to destroy my new hydro seeded lawn and run all new piping if I can't find something else wrong somewhere. I just cannot figure out why I would have great operation one minute, then the next cycle not. We just bought this home in December, so not aware of any pre-existing issues.

Wet_Boots

Supreme Member

Posts: 4,064

Location: Metro NYC

4

Thursday, April 25th 2013, 11:05pm

Is there a master valve in the system?

larrymul

New Member

Posts: 3

Location: Richland, Washington

5

Friday, April 26th 2013, 12:25am

I have a manual gate valve in the yard coming in from the City on a one inch line, which splits and runs to three zone valve boxes, and to one line to a spigot which is full-time pressurized.

I haven't OHM'd the solenoids yet but will in the morning.

Wet_Boots

Supreme Member

Posts: 4,064

Location: Metro NYC

6

Friday, April 26th 2013, 6:55am

Put a pressure gauge on the hose bib, and record the pressure readings the next time you operate the system.

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