AMTROL ST-5 Thermal Expansion Tanks Instruction Manual

: June 1, 2024
: AMTROL

Table of Contents

AMTROL ST-5 Thermal Expansion Tanks
Specifications
Product Usage Instructions
FAQ
Pre-Installation
Maintenance
Warranty
CONTACT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

AMTROL ST-5 Thermal Expansion Tanks

Specifications

Models: ST-5 through ST-210V, T-5 through T-12 For Potable Water Usage
Manufacturer : Amtrol
Material : Metal
Capacity: Varies by model

Product Usage Instructions

Pre-Installation

Ensure the expansion tank is sized properly for application (refer to Figure 1).
Remove the plastic cap from the air valve.
With the tank empty of water, adjust the air precharge to match the cold water supply pressure.
Replace and tighten the plastic cap on the air valve.
For ST-5, ST-8, and ST-12 models only: Insert the TurbulatorTM into the connector.

Installation

Install the expansion tank on the cold water supply line to the water heater between the water heater and backflow preventer or other one-way device (refer to Figure 2).
Mount the tank vertically in a downward position only.
Ensure that the tank is properly supported to hold its weight when full of water.
The water heater and expansion tank will now be operational, with the expansion tank controlling pressure increases caused by thermal expansion below the water heater relief valve setting.

FAQ

Q : What should I do if I notice signs of corrosion or malfunctioning in the product?
A : In case of any signs of corrosion or malfunctioning, it is recommended to call a qualified professional immediately to assess and address the issue to prevent any risks of personal injury or property damage.
Q: How can I ensure the longevity of the product?
A : To ensure the longevity of the product, regularly test for corrosive elements, acidity, total solids, chlorine, and other contaminants in the water supply. Treat the water appropriately to prevent premature failure and maintain satisfactory performance.

NOTE: Inspect for shipping damage and notify the freight carrier or store where the purchased it immediately if the damage is present. To avoid the 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.

WARNING

USE ONLY WITH RESIDENTIAL POTABLE WATER SYSTEMS. 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. Do not use on a system with ASME-rated vessels.
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 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 appliance or to the lower floors of the structure.
RUPTURE OR EXPLOSION HAZARD. Do not expose the Product to freezing temperatures or temperatures in excess of 200°F. Do not adjust the pre-charge or re-pressure this Product except during installation or regular inspection. Replace the Product and do not adjust the precharge 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 requirements or the maximum working pressure designated in the Product Manual, whichever is less. At least once every 3 years or if the discharge is present, a licensed professional 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.
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 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.

Pre-Installation

Ensure the expansion tank is sized properly for application (Figure 1).
Remove plastic cap from air valve.
With tank empty of water, adjust air precharge to match the cold water supply pressure.
Replace and tighten the plastic cap on air valve.
ST-5, ST-8, ST-12 only: Insert Turbulator™ into connector

WARNNG

FAILURE TO PROPERLY SEAL THE VALVE CAP WILL RESULT IN LOSS OF PRECHARGE CAUSING THE PRODUCT TO FAIL.

Installation

Install the expansion tank on the cold water supply line to the water heater at a point between the water heater and the backflow preventer or other one-way device (Figure 2).
WARNNG
Mount vertically in a downward position only. Ensure that the tank is supported properly to hold the entire weight of the tank when full of water.
Models ST-25V through ST-210V are floor-standing and may not be hung from the piping.
Once the expansion tank is installed, check the cold water supply line for any leakage. Make repairs if necessary.
Before the initial firing of the water heater, open any hot water fixture and draw water until all air is removed from the system. Turn the water heater temperature control to desired ending temperature (see water heater instructions). Do not set temperature higher than the expansion tank maximum.
To relieve initial thermal expansion, momentarily open a hot water faucet. Continue until the water heater aquastat temperature is satisfied. Once the heater is at its operating range, no further bleeding of expanded water is required.
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 licensed professional should check the complete system, including the expansion tank, yearly and more frequently as the system ages. Checking the precharge allows a small quantity of air to escape and can result in an insufficient air charge. Always check the precharge while the tank is isolated and empty of water, and be sure to maintain the proper precharge whenever the tank is inspected. Monitor the tip of the indicator cap for discolouration (Figure 3) in addition to regular product inspection. Contact the installer or a plumbing professional if the indicator cap is discoloured; tank replacement is required. Do not rely on indicator cap as the sole means of determining of tank condition.

Warranty

ST-5 through ST-12 Models: Seven (7) Year Limited Warranty ST-25V through ST- 210V Models: One (1) Year Limited Warranty T-5 through T-12 Models: One (1) Year Limited Warranty Visit www.amtrol.com for complete warranty details

Residential sizing based on: 40°F incoming water temperature; 150 psi T&P safety relief valve; Pre-charge equal to static supply pressure.
Models: ST-5, ST-8, ST-12, T-5, T-8, T-12 for residential use only
For larger commercial applications: Visit www.amtrol.com, download the AMTROL App or contact Technical Support at 401.535.1216.