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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.

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 tank or to lower floors of  

the structure.

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.  Do not expose 

product to freezing temperatures or temperatures in excess of 450°F.  

Replace the Product if corroded, damaged or with diminished integrity.  

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. 

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.

Welding to the pressure vessel boundary will 

void the ASME rating.
Leaking, corrosion or indications of damage 

are signs of an impending serious failure of the 

buffer tank. Periodically inspect for damage and if noted the product 

must be serviced or replaced. Failure to follow these instructions 

could result in serious personal injury or death and 

 

property damage.

Water temperature above 100°F can be very 

hazardous. Allow system water temperature to 

cool down below 100°F before blowing down this product. Failure to 

follow these instructions could result in serious personal injury or 

death and 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.
FOR USE IN CLOSED HYDRONIC SYSTEMS ONLY.

 Do not install on 

domestic water systems, or in open heating systems. Corrosion and tank 

failure may result.

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. 

CHILLED WATER BUFFER TANKS

CLOSED LOOP CHILLER SYSTEMS CWBT SERIES ASME

INSTALLATION & OPERATION INSTRUCTIONS

Models CWBT120-3 through CWBT1040-12

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 licensed 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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