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PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
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
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.
Figure 1.
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 140°F
Static Supply Pressure (psig)
Water Heater
Size (Gals.)
40
60
Tankless & POU
ST-1
ST-1
up to 2 gal.
40
ST-5
ST-5
50
ST-5
ST-5
60
ST-12
ST-12
80
ST-12
ST-12
120
ST-12
ST-12
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 2.
In-Line Models
Backflow Preventor, Check Valve
or Pressure Reducing Valve
Cold
3/4"
Water
Threaded
Supply
Tee
Thermal
Expansion
Tank
Water
Heater
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765 www.amtrol.com
© 2020 Worthington Industries Inc.
One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.
IMPORTANT GENERAL SAFETY INFORMATION -
into connector.
™
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 160°F
Water Heater
Static Supply Pressure (psig)
Size
80
(Gals.)
ST-1
40
ST-5
50
ST-5
60
ST-12
ST-12
80
ST-12
ST-12
120
ST-12
ST-25V
Turbulator
Installation (
™
3/4" Threaded Tee
Turbulator
Tank Connector
Hot Water
Precharge Adjustment
T & P
Relief
Valve
Remove cap and
charge to cold
supply pressure.
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.
Figure 3.
InSight
Service Indicator Cap (ST-5 and ST-12 Inline models only)
®
Normal
Operation
Clear / White
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.
40
60
80
ST-5
ST-5
ST-12
ST-5
ST-12
ST-12
ST-12
ST-12
ST-12
ST-25V
ST-25V
ST-25V
ST-5 and ST-12 only)
Press Turbulator fully
into connector prior
to installing tank.
Replace cap
and tighten until
flush with tank.
Replace
Tank
Discolored
Expansion Tank Volume (Gal.)
Maximum Temperature Setting 180°F
Water Heater
Static Supply Pressure (psig)
Size
40
60
(Gals.)
40
ST-12
ST-12
50
ST-12
ST-12
60
ST-12
ST-12
80
ST-12
ST-25V
120
ST-25V
ST-25V
Stand Models
Backflow Preventor Check Valve
or Pressure Reducing Valve
Cold
Water
Thermal
Supply
Expansion
Tank
Water
Heater
Models up to
10.3 gallons
Part #: 9015-942 (06/20)
80
ST-12
ST-12
ST-25V
ST-25V
ST-25V
Hot Water
T & P
Relief
Valve
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