Pressure System Guidelines

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The pressure system for the 2-speed pump or for the circ pump must be dedicated. There must not be any other pumps connected to this pressure system.

The pressure system for the 2-speed pump or for the circ pump must discharge water freely into the spa.

If the pressure system for the 2-speed pump includes a diverter valve, or a diverter jet, there must not be an “off” position that would stop water flow from the pump or any other position that would throttle or reduce water flow from the pump.

If the pressure system for the 2 speed pump includes flow adjustable jets that can be 100% closed, at least 2 non-adjustable jets must be included in each possible inlet circuit so that a minimum of 20 gpm can flow during low pump operation with all the jets closed. Any other means of by-passing flow around the closed jets is acceptable as long as the by-pass means is down stream from the heater and allows a minimum of 20 gpm to flow through the heater during low speed operation.

Note: In some cases, a minimum of 25 GPM of water through the heater must be maintained. In some cases a specific flow direction is also required.

If the pressure system for the 2-speed pump includes flow adjustable jets that do not close 100%, at least 20 gpm must flow during low speed operation through each possible inlet circuit with all the jets closed.

If the pressure system for a 2-speed pump or for a circ pump includes a filter, the filter must be equipped with a by-pass around the cartridge that opens when the cartridge gets dirty. (Spring tension holding the by-pass valve closed must be overcome by the pressure of the pump.) This by-pass must be capable of flowing a minimum of 20 gpm during low pump operation with the cartridge 100% blocked.

If the pressure system for a 2-speed pump or for a circ pump includes branch circulation lines such as circuits intended to operate ozone injection systems, these branch circulation lines must be connected downstream from the heater.