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USE ONLY IN RESIDENTIAL CLOSED HYDRONIC 

SYSTEMS.

 Do not install on domestic water 

systems, or in open heating systems. Corrosion and tank failure may 

result. Use a Therm-X-Trol

®

 or Therm-X-Span

®

 for domestic water 

systems. Use a Radiant EXTROL

®

 for radiant heating systems where air 

elimination equipment or barrier tubing is not used.

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.

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.html

RUPTURE OR EXPLOSION HAZARD.

 Do not 

expose product to freezing temperatures or 

temperatures in excess of 

240°F

.  Do not adjust the pre-charge or 

re-charge  this Product except during installation or regular inspection. 

Replace the Product and do not adjust the pre-charge 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 

contractor should inspect the 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 

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.

EXTROL

®

EXPANSION TANKS FOR HYDRONIC HEATING & CHILLED WATER SYSTEMS

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.

Models EX-15 through EX-90  

Models SX-30V through SX-160V

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