Amtrol ST-5 Installation instructions

USE ONLY WITH RESIDENTIAL POTABLE
WATER SYSTEMS. Do not operate in a setting
with freezing temperatures or where the temperature can exceed 200°F
and do not exceed the maximum working pressure specified for this
Product. Do not use on a system with ASME-rated vessels.
READ CAREFULLY THE PRODUCT
INSTALLATION, 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. Do not install this
product where leaking or flooding could cause property damage to the
area adjacent to the appliance or to lower floors of the structure.
RUPTURE OR EXPLOSION HAZARD. Do not
expose Product to freezing temperatures or
temperatures in excess of 200°F. Do not adjust the pre-charge or
re-pressure this Product except during installation or regular inspection.
Replace the Product and do not adjust the precharge if corroded,
damaged or with diminished integrity. Adjustments to pre-charge must be
done at ambient temperature only. 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.
A relief valve must be installed to prevent pressure
in excess of local code requirement or maximum
working pressure designated in the Product Manual, 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.
This product can expose you to chemicals including
lead, which is known to the State of California to
cause cancer and birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov.
THERMAL EXPANSION TANKS
FOR POTABLE WATER
INSTALLATION & OPERATION INSTRUCTIONS
Models ST-5 through ST-210V
Models T-5 and T-12
NOTE: Inspect for shipping damage and 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.

Pre-Installation
1 Ensure expansion tank is sized properly for application (Figure 1).
2. Remove plastic cap from air valve.
3. With tank empty of water, adjust air precharge to match cold water
supply pressure.
4. Replace and tighten plastic cap on air valve.
5. ST-5 and ST-12 only: Insert Turbulator™into connector.
FAILURE TO PROPERLY SEAL VALVE CAP
WILL RESULT IN LOSS OF PRECHARGE
CAUSING PRODUCT TO FAIL.
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 2).
Mount vertically only. Ensure that tank is
supported properly to hold the entire weight of
the tank when full of water.
Models ST-25V through ST-210V are floor
standing and may not be hung from the piping.
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 a hot water fixture and
draw for one minute to purge air. Next, close and open the fixture in 30
second intervals, repeating three thimes to flush the tank and piping.
Finally, turn the water heater temperature control to desired ending
temperature (see water heater instructions). Do not set temperature
higher than the expansion tank maximum.
4. To relieve initial thermal expansion, momentarily open a hot water
faucet. Continue until water heater aquastat 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. Checking
the precharge allows a small quantity of air to escape and can result in an
insufficient air charge. Always check the precharge while the tank is isolated
and empty of water, and be sure to maintain the proper precharge whenever
the tank is inspected. Monitor the tip of the indicator cap for discoloration
(Figure 3) in addition to regular product inspection. Contact the installer
or a plumbing professional if indicator cap is discolored; tank replacement
is required. Do not rely on indicator cap as sole means of determining of
tank condition.
Warranty
ST-5 and ST-12 Models: Seven (7) Year Limited Warranty
ST-25V through ST-210V Models: One (1) Year Limited Warranty
T-5 and T-12 Models: One (1) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.
Residential sizing based on: 40°F incoming water temperature; 150 psi T&P safety relief valve; Pre-charge equal to static supply pressure.
Models: ST-5, ST-12, T-5, T-12 for residential use only.
For larger commercial applications: Visit www.amtrol.com, download the AMTROL App or contact Technical Support at 401.535.1216.
Figure 1.
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 180°F
Water Heater
Size
(Gals.)
Static Supply Pressure (psig)
40 60 80
40 ST-12 ST-12 ST-12
50 ST-12 ST-12 ST-12
60 ST-12 ST-12 ST-25V
80 ST-12 ST-25V ST-25V
120 ST-25V ST-25V ST-25V
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 160°F
Water Heater
Size
(Gals.)
Static Supply Pressure (psig)
40 60 80
40 ST-5 ST-5 ST-12
50 ST-5 ST-12 ST-12
60 ST-12 ST-12 ST-12
80 ST-12 ST-12 ST-25V
120 ST-12 ST-25V ST-25V
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 140°F
Water Heater
Size (Gals.)
Static Supply Pressure (psig)
40 60 80
Tankless & POU
up to 2 gal. ST-1 ST-1 ST-1
40 ST-5 ST-5 ST-5
50 ST-5 ST-5 ST-5
60 ST-12 ST-12 ST-12
80 ST-12 ST-12 ST-12
120 ST-12 ST-12 ST-25V
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
Figure 3.
Clear / White
Normal
Operation
Discolored
Replace
Tank
InSight®Service Indicator Cap (ST-5 and ST-12 Inline models only)
Figure 2.
In-Line Models Stand Models
Thermal
Expansion
Tank
3/4”
Threaded
Tee
Cold
Water
Supply
Backflow Preventor, Check Valve
or Pressure Reducing Valve
Hot Water
T & P
Relief
Valve
Water
Heater
Turbulator™Installation (ST-5 and ST-12 only)
Press Turbulator fully
into connector prior
to installing tank.
3/4” Threaded Tee
Turbulator
Tank Connector
Thermal
Expansion
Tank
Hot Water
T & P
Relief
Valve
Water
Heater
Cold
Water
Supply
Backflow Preventor Check Valve
or Pressure Reducing Valve
Remove cap and
charge to cold
supply pressure.
Replace cap
and tighten until
flush with tank.
Precharge Adjustment
© 2020 Worthington Industries Inc. Part #: 9015-942 (06/20)
One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765 www.amtrol.com
Models up to
10.3 gallons