This guide shows you how to set up and operate a set of diverter valves for a basic pool and spa system. This pool system includes a main drain, one skimmer, a suction line and a set of pool return ports. The spa system includes a spa drain and return jets. Water will flow from the pool and spa to the pump, through a filter and back out to the pool and spa.
We should point out that this setup is not the only way you could configure your diverter valves bot it is a working solution and it does show you some of the options considered in setting up the diverter valves.
SUCTION SIDE SETUP - This picture shows a typical diverter valve configuration for the suction side of a pool with a main drain, a skimmer, and a suction line for a cleaner; and for a spa with a spa drain. This setup uses three three-way diverter valves to control the incoming flow to the pump from the three sources. The following steps show examples of handle positions for controlling this water flow,
VALVE INSTALLATION - When installing these 3-way diverter valves, you have to watch how they are positioned. These valveS have three ports: two ends and one center. By design you can close off part of all of the water flow from either end ports, but you cannot shut off the center port. The handle will only rotate 180° on the side opposite the center port. If this valve is installed incorrectly, as shown in the Step 4, it is possible to inadvertently shut off all water to the pump and run it dry. In this setup, Valve 1 selects the flow from either the pool drain or the skimmer or both. Valve 2 selects the flow from the pool vacuum line or Valve 1.or both. Valve 3 selects flow from the spa drain or valve 2 or both.
INCORRECT SET UP - Here's an example of how you shouldn't set up a diverter valve. If you glue the Valve 2 in this configuration, you will see that the handle can be rotated to completely shut off the flow of water to the pump. The pump will not run long in a dry mode without damaging the motor shaft seal. Any port that should always be open, in this case the to pump port, has to be attached to the center port of a three-way diverter valve as shown in our other suction steps
VACUUM LINE ONLY OPEN - If you want to use your pool suction cleaner and your pool suction is too low to run the cleaner, you may want to close off the main drain and skimmer to direct more suction to the vacuum line. You can also shut off the spa drain for even more vacuum suction. This picture shows flow from Valve 1 completely shut off and Valve 3 set to shut off the spa drain. Water is flowing from the pool vacuum line through Valve 1 to Valve 3 and then to the pump.
VACUUM LINE OPEN WITH PARTIAL FLOW FROM DRAIN AND SKIMMER - You may find that in shutting off Valve 1 you have too much suction on the vacuum line or that your pump isn't getting sufficient flow from the one line to maintain prime. In this case, you will have to partially open up Valve 2 to increase flow and reduce the suction on the vacuum line. This pictures shows opening up the flow from Valve 1 by rotating the Valve 2 handle counter-clockwise 45 °.
SPA DRAIN ONLY OPEN - To drain the spa quickly you might shut off all water flow to the pump except the spa drain. This setting is show in the picture at the left. This has to be coordinated with shutting off the spa return flow covered in Step 14. And you have to be careful that you turn the pool flow back on before the spa goes completely dry and you have no water to the pump.
RETURN SIDE SETUP - The return side valves control the water flow after the pump and generally after the filter and chlorinator. This picture shows a typical diverter valve configuration for the return side for: a pool with one or more pool returns, a spa return and a number of spa jets. This setup uses two 3-way diverter valves to control the returning flow after the pump to the three destination. The following steps show some of the main valve settings for selecting the flow of water back to the pool and spa,