Models 4RH36, 4RH37, 4RH38, 4RH39, and 4RH40
3
Teel Operating Instructions and Parts Manual
E
N
G
L
I
S
H
Installation (Continued)
To avoid airlocking, slope suction pipe
slightly upward toward the pump.
NOTE:
To prevent flooding when
removing pump for service, all flooded
suction systems
must
have gate valves
in suction and discharge pipes.
POOL PUMP SUCTION
REQUIREMENTS
Pump suction is
hazardous and can
trap and drown or disembowel bathers.
Do not use or operate swimming pools,
spas, or hot tubs if a suction outlet cover
is missing, broken, or loose. Follow the
guidelines below for a pump installation
which minimizes risk to users of pools,
spas, and hot tubs.
ENTRAPMENT PROTECTION
The pump suction system must provide
protection against the hazard of
suction entrapment or hair
entrapment/entanglement.
SUCTION OUTLET COVERS
All suction outlet covers must be
maintained. They must be replaced if
cracked, broken, or missing.
See below 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, for
each swimming pool pump suction
line. The centers of the main drains
(suction fittings) must be at least three
feet apart (See Figure 1).
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).
However, if two main drains run into a
single suction line, the single suction
line may be equipped with a valve
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 requirements above are
met.
WATER VELOCITY
The maximum water velocity through
any suction outlet must be 1.5 feet per
second or less 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 fittings 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 piping must be six feet per
second 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 in the U.S.A.
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.
Avoid fittings which could cause an air
trap.
Pool fittings must conform to
International Association of Plumbing
and Mechanical Officials (IAPMO)
standards in the United States.
Use only non-entrapping suction
fitting or double suction.
No valves between
Tee and main drains
Suction outlet
(main drain)
Suction outlet
(main drain)
Pump
Flow
Valves OK between
pump and Tee
IAPMO Certified
Anti-entrapment
cover or suction
fitting, screw-fastened
to main drain sump
IAPMO Certified
Anti-entrapment
cover or suction
fitting, screw-fastened
to main drain sump
At least
3 Feet
Figure 1 – Recommended pump suction layout.
®
