Use and Care Manual

Series PLT
Potable Water Expansion Tanks
Series PLT Potable Water Expansion Tanks are designed to
absorb the increased volume of water created by thermal
expansion and to maintain balanced pressure throughout
the potable water supply system.
Heated water expands, and in a domestic hot water system,
the system may be closed when the potable water system is
isolated from the public water supply by a one-way valve such
as pressure reducing valve, backflow preventer or check valve.
Provisions must be made for this expansion.
Series PLT expansion tanks absorb the increased volume of
water created when the hot water storage tank is heated and
keeps the system pressure below the relief setting of the
T&P relief valve.
It is a pre-pressurized steel tank with an expansion membrane
that prevents contact of the water with the air in the tank. This
prevents loss of air to the water and insures long and trouble-
free life for the system. These tanks may be used with all types
of Direct Fired Hot Water Heaters (gas, oil or electric) and hot
water storage tanks.
Features
• Rugged flexible butyl diaphragm
• Field adjustable pre-charge
• In-line and free standing models
• Can be used with most standard hot water heaters
and storage tanks
Models
PLT-5-M1
3
⁄4" male connection, tank volume 2.1 gal.
PLT-12-M1
3
⁄4" male connection, tank volume 4.5 gal.
PLT-20-M1
3
⁄4" male connection, tank volume 8.5 gal.
PLT-35-M1 1" female connection, tank volume 14.00 gal.
Specifications
The potable water expansion tank shall be of drawn steel
construction. It shall have a Butyl diaphragm separating the air
chamber from the water containing chamber. Inlet connector
shall be Stainless Steel. Materials of manufacture for the
diaphragm shall be FDA approved.
The potable water expansion tank shall be a Watts Model PLT.
Note: The potable water expansion tank shall be installed in
the cold water service pipe line on the supply side of the water
heater (or water storage tank). A pressure relief valve sized and
installed in accordance with local codes must be incorporated
in the system.
In those systems requiring a combined temperature and pres-
sure safety relief valve, the temperature and pressure relief valve
should be sized and installed in accordance with local codes.
Adequate drainage provisions should be provided where water
flow will cause damage.
PLT-20
PLT-12
PLT-5
PLT-35
Standards
Models PLT-5, PLT-12 and PLT-20
are Listed by IAPMO.
Certified to ANSI/NSF 61
Model PLT-35
Certified to ANSI/NSF 61
See chart on back
(73˚F/23˚C)
For Water Heater and Hot Water Storage Tank Applications
ES-PLT
LEAD FREE
*
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
NOTICE
Inquire with governing authorities for local installation requirements
The information contained herein is not intended to replace the full
product installation and safety information available or the experience
of a trained product installer. You are required to thoroughly read all
installation instructions and product safety information before begin-
ning the installation of this product.
NOTICE