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READ CAREFULLY THE PRODUCT 

INSTALLATION & OPERATION INSTRUCTIONS.   

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.

EXPLOSION HAZARD.

 Failure to follow the 

instructions in the accompanying product manual 

can cause a rupture or explosion; possibly causing serious or fatal injury, 

leaking or flooding and/or property damage.

Use only with potable water system.  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 in the Manual.  Mount vertically only.

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, 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 leakage of the tank or 

connections could cause property damage to the area adjacent to the 

appliance or to lower floors of the structure.

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 for any adjustments 

required at the time of initial installation, especially if Product 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 lead 

to Product failure, serious or fatal personal injury, leakage and/or property 

damage.

EXPLOSION OR RUPTURE HAZARD 

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.

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. 

Wash hands after handling.

THERM-X-TROL

® 

THERMAL EXPANSION ABSORBERS

INSTALLATION & OPERATION INSTRUCTIONS

Models ST-5C(DD) through ST-210VC

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.

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