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PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
Application
The Model 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 the expansion tank maximum.
© 2015 AMTROL Inc.
I
MPORTANT GENERAL SAFETY INFORMATION -
Figure 1.
Hot Water
T & P
Relief
Valve
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765
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 professional plumber should check the complete
system, including the expansion tank, yearly and
more frequently as the system ages.
Warranty
ST-1 Model: Five (5) Year Limited Warranty
Visit www.amtrol.com for complete warranty
details.
Water
Heater
ST-1
Thermal
Expansion Tank
Backflow Preventor
Check Valve or
Pressure Reducing Valve
F: 800.293.1519
www.amtrol.com
Cold
Water
Supply
Part #: 9013-011 (09/15)
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