Suction System Guidelines

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

The suction system for the 2-speed pump or for the circ pump must include the following:

A. 2 suction fittings, or

B. 1 suction fitting and a skimmer.

If the suction system for the 2-speed pump or for the circ pump includes a filter, it is desirable that the filter incorporate a by-pass around the filter cartridge that opens when the cartridge gets dirty. (Spring tension holding the by-pass valve closed must be overcome by the vacuum of the pump.) This by-pass should be capable of flowing a minimum of 20 gpm during the low speed operation of the 2-speed pump or during circ pump operation with the cartridge 100% blocked. The inclusion of a suction fitting appropriately plumbed into the suction circuit in conjunction with a vacuum filter may also meet this requirement.

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.