Utilitech UT1100IGPP Manual page 13

inSTAllATion inSTruCTionS
Suction outlets per pump
Provide at least two hydraulically balanced main
drains, with covers, as suction outlets for each
circulating pump suction line. See Figure 3. The
centers of the two main drains (suction outlets) on
any one suction line must be at least 3 ft. apart.
The system must be built so that it cannot operate
with the pump drawing water from only one main
drain (e.g., there must be at least two main drains
connected to the pump whenever it is running –
see Figure 3). However, if two main drains run
into a single suction line, that suction line may be
equipped with a valve (not included) which will shut
off both main drains from the pump.
More than one pump can be connected to a single
suction line as long as the above requirements
are met.
Water Velocity
The maximum water velocity through the suction
fitting or cover for any suction outlet must be
1.5 ft. per second unless the outlet complies with
the latest ASME/ANSI specification for Suction
Fittings For Use in Swimming Pools, Spas, Hot
Tubs, and Whirlpool Bathtub Applications. In any
case, do not exceed the suction fitting's maximum
designed flow rate.
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 6 ft. per
second or less even if one main drain (suction
outlet) is completely blocked. The flow through the
remaining main drain(s) must comply with the latest
ASME/ANSI specifications for Suction Fittings
For Use in Swimming Pools, Spas, Hot Tubs, and
Whirlpool Bathtub Applications.
Testing and Certification
Suction outlet covers must have been tested by a
nationally recognized testing laboratory and found
to comply with the latest ASME/ANSI specifications
for Suction Fittings For Use in Swimming
Pools, Spas, Hot Tubs, and Whirlpool Bathtub
Applications.
Fittings
Fittings restrict flow. For best efficiency, use fewest
possible fittings (but at least two suction outlets).
Avoid fittings which could cause an air trap. Pool
®
fittings must conform to International Association
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