Guide To Pool Heating

Page 8 of 51

Skimmer Considerations

In some pool plumbing, the skimmers are tied directlyto the “main drain”line with a

gate valve for shutoff. If we simply reversed the flow of water in the pool without doing

something to the skimmers, the skimmers would blow water out onto the surface of the pool

instead of “sucking” surface debris [in the flowreversal mode].

This issue is handled by a companion valve to the flowreversal valve. It is called a

“proportioner valve.”This “proportioner valve” is connected directly to the skimmer line, the

flowreversal valve, and the pump’s intake suction line. The function of this valve is to adjust the

proper suction on the skimmers during reverse flow. The valve “proportions” the suction from the

pump to the flowreversal valve and the skimmer line. It is set one time for proper skimmer suction

but can be used to channel all of the pump’s suction into the skimmer line if desired. [This is

desirable when the vacuum line is connected to the skimmer line.]This “proportioner valve” is not

discussed further in this report. See the swimming pool plumbing diagrams at the back of this

report. They provide a systems perspective on how these special valves are installed and used.

In-Floor Circulation Systems

Some newer pools are equipped with an in-floor circulation system. The flowreversal

valve will work in conjunction with some of these. Others, however, have incorporated some

unique features such as “pop-ups” in the floor of the pool. These pop-ups cycle sequentially and

rotate. They perform two functions. First, as they rotate -- they “sweep” the dirt on the floor

towards the main drain. They also allow the water to rise in the pool creating a more efficient

heating environment.