Amtrol ST-1 Installation instructions

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 QUALIFIED 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.

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 designated in the Product Manual,

whichever is less. At least once every 3 years or if

discharge is present, a licensed contractor 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.

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.

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.

CALIFORNIA PROPOSITION 65 WARNING! This

product contains a chemical known by the State

of California to cause cancer and to cause birth

defects or other reproductive harm. (California

Installer/Contractor - California law requires that

this notice be given to consumer/end user of this

product.) For more information: www.amtrol.

com/prop65.htm

THERMAL EXPANSION TANK

FOR POTABLE WATER

INSTALLATION & OPERATION INSTRUCTIONS

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

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.

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.

1400 Division Road, West Warwick, RI USA 02893

T: 800.426.8765 F: 800.293.1519

www.amtrol.com

Figure 1.

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

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