In the first part of this guide to building and installing your own PVC sprinkler system, you laid out the areas in the grass where you wanted the sprinklers to go, you dug suitable trenches, and you attached the main supply line to the solenoid valve. In this part of the guide, you will learn how to put up your pipes into manifold risers, how to plumb the sprinklers into the manifold, and how to arrange the sprinkler heads as you want them to go. In order to ensure that you get the best from your PVC sprinklers, you should check that as much of your garden as possible will get the water.
Step 1 - Installing the Manifold Risers
With your sprinkler system, you will have been given a number of valves, and terminal connections. These are the manifolds, and these valves control the output of water. The smaller, single valves are manifold risers, which need to be fitted into the pipes. You will now need to install the risers for your PVC sprinkler system. These risers need to be placed wherever you wish to have the sprinkler being used. The manifold risers will raise up the pipe to meet the nozzle, so that the pipe can be accessed. You need to ensure that the terminal parts of your manifold risers fit the correct size for your nozzle head, otherwise the two parts will not connect together, and neither will work.
Step 2 - Plug in the Pipe
Take the main line, and connect it to the manifold valve which has several connecting parts. This manifold will need to be connected to either a timer, or a control system, as this is the valve through which the water will flow. Take the water supply lines, and add this to the manifold on the opposite side. You will need to use a backflow preventer to stop the water sprinkler from losing pressure and allowing water to flow back into the house and the drinking water. The manifold pipe should now be connected to both the sprinkler nozzles (via the main pipe) and the water supply line.
Step 3 - Add the Heads
You are now ready to add the sprinkler heads to your pipes. Take each head, according to the position you marked out earlier, and connect them to the pipe. The head will need to be in enough soil so that it is fully supported by the ground, and is not laying on its side. Ensure that it cannot be knocked over by animals or children.
Step 4 - Finishing Touches
Once the heads have been screwed into place, you are ready to turn on the water. Allow the water to flow through the sprinkler, and check that each head is working correctly, and is in the right position. Walk along the trenches where the pipes have been laid, and ensure that there are no leaks, and the pipe is not showing above the surface. Turn off the water.