Therm-X-Span T-5 - Water heaters and boilers Amtrol - Free user manual and instructions

Product Type	Thermal Expansion Tank
Model	Therm-X-Span T-5
Capacity	5 Gallons (18.9 L)
Maximum Working Pressure	150 psi (10.3 bar)
Maximum Temperature	240°F (116°C)
Connection Size	3/4" NPT Female
Tank Material	Steel with epoxy lining
Diaphragm Material	Butyl Rubber
Pre-Charge Pressure	40 psi (2.76 bar)
Overall Height	13.5 inches (34.3 cm)
Overall Diameter	10.5 inches (26.7 cm)
Dry Weight	12 lbs (5.4 kg)
Mounting	Vertical or horizontal with bracket
Application	Domestic water heating systems
Certifications	ASME, NSF 61, CSA
Warranty	5 years limited
Maintenance	Check pre-charge pressure annually
Repairability	Diaphragm not replaceable; whole unit replacement

Frequently Asked Questions - Therm-X-Span T-5 Amtrol

What is the purpose of the Therm-X-Span T-5 expansion tank?

The Therm-X-Span T-5 absorbs excess pressure caused by thermal expansion in closed water heating systems, preventing pressure buildup and protecting the water heater and plumbing.

How do I install the T-5 expansion tank?

Install the tank on the cold water supply line near the water heater, ensuring the connection is secure and the tank is oriented vertically or horizontally as space allows with the included bracket.

What is the correct pre-charge pressure for the T-5?

The pre-charge pressure should match the system's static water pressure, typically 40 psi. Adjust using a bicycle pump or air compressor at the schrader valve on top of the tank.

How do I check the pre-charge pressure?

Turn off the water supply, drain the tank, then use a tire pressure gauge to check the pressure at the schrader valve. Add air if needed to match the system static pressure.

What happens if the expansion tank fails?

A failed expansion tank (waterlogged) causes the pressure relief valve to discharge frequently, leading to water hammer and potential water heater damage. Replace the tank if the diaphragm is ruptured.

Can I install the T-5 horizontally?

Yes, the T-5 can be installed horizontally or vertically. Use the included mounting bracket to secure it properly.

How often should I maintain the expansion tank?

Check the pre-charge pressure annually. If the tank feels heavy or water comes out of the air valve, the diaphragm may be damaged and replacement is needed.

What size expansion tank do I need?

For a typical residential water heater, a 5-gallon tank like the T-5 is suitable. Larger systems may require a bigger tank. Consult a professional for sizing.

Are there any safety precautions for the T-5?

Ensure the tank is supported properly. Never exceed the maximum working pressure of 150 psi. Drain the tank before checking pre-charge to avoid water damage.

What does the T-5 model number stand for?

The "T-5" indicates the tank capacity of 5 gallons. The Therm-X-Span series is designed for thermal expansion control in potable water systems.

USER MANUAL Therm-X-Span T-5 Amtrol

Models ST-5 through ST-210V

Models T-5 through T-12

White industrial water tank with 'AMTROL' branding, no visible text or symbols on the main body

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.

WARNING

USE ONLY WITH RESIDENTIAL POTABLE WATER SYSTEMS. Do not operate in a setting structure or where the temperature can exceed 200^ the maximum working pressure specified for this on a system with ASME-rated vessels.

WARNING

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.

WARNING

This Product, like most Products under pressure, may over time corrode, weaken and burst or rius or fatal injury, leaking or flooding and/or minimize risk, a licensed professional must install act and service the Product. A drip pan connected to must be installed if leaking or flooding could cause it not locate in an area where leaking could cause the area adjacent to the appliance or to lower floors

WARNING

RUPTURE OR EXPLOSION HAZARD. Do not expose Product to freezing temperatures or less of 200^ . 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.

WARNING

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 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.

WARNING

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.

WARNING

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.

PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY

IMPORTANT GENERAL SAFETY INFORMATION -

ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.

Pre-Installation

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

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 2).
   Mount vertically in downward position only. WARNING Ensure that tank is supported properly to hold the entire weight of the tank when full of water.

Models ST-25V through ST-210V are floor WARNING standing and may not be hung from the piping.

1. Once the expansion tank is installed, check the cold water supply line for any leakage. Make repairs if necessary.

2. 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.

3. To relieve initial thermal expansion, momentarily open a hot water faucet. Continue until water heater aquastat temperature is satisfied. Once heater is at its operating range, no further bleeding of expanded water is required.

4. 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 discoloration (Figure 3) in addition to regular product inspection. Contact the installer or a plumbing professional if indicator cap is discolored; tank replacement is required. Do not rely on indicator cap as sole means of determining of tank condition.

Figure 3.
InSight™ Service Indicator Cap (ST-5, ST-8 and ST-12 Inline models only)

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.

Figure 1.
Expansion Tank Volume (Gal.) Maximum Temperature Setting 140°F

Water Heater Size (Gals.)	Static Supply Pressure (psig)
	40 60	80
40 2.0 2.0	2.0
50 2.0 2.0	2.0
60 3.2 3.2	3.2
80 3.2 3.2	4.4
120 4.4 4.4	10.3

Expansion Tank Volume (Gal.)
Maximum Temperature Setting 160°F

Water Heater Size (Gals.)	Static Supply Pressure (psig)
	40 60	80
40 2.0 2.0	3.2
50 2.0 3.2	3.2
60 3.2 3.2	4.4
80 3.2		4.4 10.3
120 4.4		10.3 10.3

Expansion Tank Volume (Gal.)
Maximum Temperature Setting 180°F

Water Heater Size (Gals.)	Static Supply Pressure (psig)
	40 60	80
40 3.2 3.2	3.2
50 3.2 3.2	4.4
60 3.2 4.4	10.3
80 4.4 10.3	10.3
120 10.3	10.3	10.3

Residential sizing based on: 40^ 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.

Figure 2.
In-Line Models

graph TD
    A["Cold Water Supply"] --> B["Backflow Preventor, Check Valve or Pressure Reducing Valve"]
    B --> C["Thermal Expansion Tank"]
    C --> D["Water Heater"]
    D --> E["T & P Relief Valve"]
    E --> F["Turbulator Installation (S1-5, S1-8, S1-12 only)"]
    F --> G["Press Turbulator fully into connector prior to installing tank."]
    H["Mounting tank vertically is recommended"] --> D
    I["Remove cap and charge to cold supply pressure."] --> J["Precharge Adjustment"]
    K["Replace cap and tighten until flush with tank."] --> L["Final component"]

Stand Models

graph LR
    A["Cold Water Supply"] --> B["Refrigerator"]
    B --> C["Thermal Expansion Tank"]
    C --> D["Water Heater"]
    D --> E["T & P Relief Valve"]
    E --> F["Hot Water"]
    G["Backflow Preventor Check Valve or Pressure Reducing Valve"] --> B

WORTHINGTON

INDUSTRIES

1400 Division Road, West Warwick, RI USA 02893

T: 800.426.8765 www.amtrol.com

© 2019 Worthington Industries Inc.

One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.

Part #: 9015-942 (01/19)