Amtrol ST-1 Installation instructions

READ CAREFULLY THE
PRODUCTINSTALLATION,
OPERATING AND MAINTENANCE MANUAL.
FAILURE TO FOLLOW THE INSTRUCTIONS AND
WARNINGS IN THE MANUAL MAY RESULT IN
SERIOUS OR FATAL INJURY AND/OR PROPERTY
DAMAGE, AND WILL VOID THE PRODUCT
WARRANTY. THIS PRODUCT MUST BE
INSTALLED BY A LICENSED PROFESSIONAL.
FOLLOW ALL APPLICABLE LOCAL AND STATE
CODES AND REGULATIONS, IN THE ABSENCE
OF SUCH CODES, FOLLOW THE CURRENT
EDITIONS OF THE NATIONAL PLUMBING CODE
AND NATIONAL ELECTRIC CODE,
AS APPLICABLE.
This Product, like most
Products under pressure,
may over time corrode, weaken and burst or explode,
causing serious or fatal injury, leaking or flooding and/
or property damage. To minimize risk, a licensed
professional must install and periodically inspect and
service the product. A drip pan connected to an
adequate drain must be installed if leaking or flooding
could cause property damage. Do not locate in an
area where leaking could cause property damage to
the area adjacent to the appliance or to lower floors
of the structure.
The recurrence of pressure
buildup may indicate that this
unit is in need of replacement. Operating a plumbing
system in this condition presents the risk of damage
and leaks.
RUPTURE OR EXPLOSION
HAZARD. Do not expose
Product to freezing temperatures or water
temperatures in excess of 140°F. Failure to properly
size the product or follow these instructions may
result in excessive strain on the system and may lead
to product failure, serious or fatal personal injury,
leakage and/or property damage. USE ONLY WITH
RESIDENTIAL POTABLE WATER SYSTEMS.
A relief valve must be
installed to prevent pressure
in excess of local code requirement or maximum
working pressure of 150 psig, whichever is less. At
least once every 3 years or if discharge is present, a
licensed professional should inspect the temperature
and pressure relief valve and replace if corrosion is
evident or the valve does not function. FAILURE TO
INSPECT THIS VALVE AS DIRECTED COULD
RESULT IN UNSAFE TEMPERATURE OR
PRESSURE BUILD-UP WHICH CAN RESULT IN
PRODUCT FAILURE, SERIOUS INJURY OR
DEATH AND/OR SEVERE PROPERTY DAMAGE
AND VOID THE PRODUCT WARRANTY.
Chlorine & Aggressive
Water: The water quality can
significantly influence the life of this product. You
should test for corrosive elements, acidity, total solids
and other relevant contaminants, including chlorine
and treat your water appropriately to insure
satisfactory performance and prevent premature
failure.
NOTE: Inspect for shipping damage. Notify freight carrier or store where purchased immediately if damage is
present. To avoid risk of personal injury and property damage, if the product appears to be malfunctioning or shows
signs of corrosion, call a qualified professional immediately. Current copies of the product manual can be viewed at
www.amtrol.com. Use proper safety equipment when installing.
THIS IS THE SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU TO POTENTIAL PERSONAL
INJURY AND OTHER HAZARDS. OBEY ALL SAFETY MESSAGES THAT FOLLOW THIS SYMBOL
TO REDUCE THE RISK OF PERSONAL INJURY AS WELL AS PROPERTY DAMAGE.
Model ST-1
THERMAL EXPANSION TANK
FOR POTABLE WATER
INSTALLATION & OPERATION INSTRUCTIONS

Application
The ST-1 expansion tank is for use on tankless,
residential on-demand water heaters with a total
water content of 2 gallons or less and a maximum
set point of 140°F. Do not use with larger storage-
type water heaters, as these will exceed the
capacity of the ST-1.
Installation
1. Install the expansion tank on the cold water
supply line to the water heater at a point
between the water heater and backflow
preventer or other one-way device (Figure 1).
2. Once the expansion tank is installed, check
the cold water supply line for any leakage.
Make repairs if necessary.
3. Before the initial firing of the water heater,
open any hot water fixture and draw water
until all air is removed from the system.
Set the water heater temperature control to
desired ending temperature (see water heater
instructions). Do not set temperature higher
than 140° F.
4. To relieve initial thermal expansion, slightly
open a hot water faucet. Continue until water
heater temperature is satisfied. Once heater is
at its operating range, no further bleeding of
expanded water is required.
5. The water heater and expansion tank will
now be operational. The expansion tank will
control pressure increases caused by thermal
expansion to a level below the water heater
relief valve setting.
Maintenance
A licensed professional should check the
complete system, including the expansion tank,
yearly and more frequently as the system ages.
Warranty
ST-1 Model: Seven (7) Year Limited Warranty
Visit www.amtrol.com for complete warranty
details.
Figure 1. Typical Installation
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
ST-1
Thermal
Expansion Tank
Hot Water
T & P
Relief
Valve
Cold
Water
Supply
Backflow Preventor
Check Valve or
Pressure Reducing Valve
Water
Heater
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765 www.amtrol.com
© 2019 Worthington Industries Inc. Part #: 9013-011 (02/19)
One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.