Astralpool A145C3 Manuale d'uso - Pagina 8

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Suction Outlet Covers

All suction outlet covers must be maintained. They must be replaced if

cracked, broken, or missing.

See Page 6 for outlet cover certification requirements.

All suction outlets must have correctly installed, screw-fastened covers in

place.

Outlets Per Pump

Provide at least two hydraulically balanced main drains, with covers (see

Page 6), for each swimming pool pump suction line. The centers of the main

drains (suction outlets) must be at least three feet apart.

The system must be built so that it cannot operate with the pump drawing

water from only one main drain (that is, there must be at least two main drains

connected to the pump whenever it is running). (See Figure 1). However, if

two main drains run into a single suction line, the single suction line may be

equipped with a valve which will shutoff both main drains from the pump

(see Figure 1).

More than one pump can be connected to a single suction line as long as the

requirements above are met.

Water Velocity and Flow Rates

If 100% of the pump's flow comes from the main drain system, the maximum

water velocity in the pump suction hydraulic system must be six feet per sec-

ond or less even if one main drain (suction fitting) is completely blocked. The

flow through the remaining main drain(s) must comply with the latest

ASME/ANSI Specification for Suction Fittings For Use in Swimming Pools,

Spas, Hot Tubs, and Whirlpool Bathtub Applications.

The flow through any main drain suction fitting must not exceed the flow rat-

ing of that fitting. If the flow through the main drain(s) is found to exceed the

manufacturer's specified rating(s), sufficient additional suction sources must

be added to lower the flow through all main drains to their rated capacity or

below.

Strainer

Maximum hydrostatic test pressure is 40 PSI (275 kPa) water

pressure. To avoid explosion hazard, DO NOT test strainer

with air pressure. Air pressure in strainer can blow cover off of

strainer body, which can cause severe or fatal injury. Open fil-

ter air release valve and release ALL air (wait for a steady stream of water from

vent) before hydrostatically testing strainer.

To avoid breaking pump or putting unnecessary strains on pump or strainer

body, support pipe independently of pump/strainer.

Center the strainer cover when installing it (especially when pressure testing).

When installing cover, clean O-Ring groove in strainer body, and lubricate

with petroleum jelly as follows:

A. O-Ring;

B. Sealing surfaces of strainer cover and body;

C. Threads and faces of wing nuts.

This will prevent corrosion, improve seal, and ease maintenance.

If strainer is installed backwards, debris will collect in suction pipe instead of

in strainer basket. Install strainer with cast-on flow arrows pointing in direc-

tion of water flow.

Basket will only go into strainer one way; don't force it.