Extrol SX-40V - Water heaters and boilers Amtrol - Free user manual and instructions

Product Type	Expansion Tank for Water Heater / Boiler
Brand	Amtrol
Model	Extrol SX-40V
Capacity	4.0 gallons (15.1 liters)
Pre-charge Pressure	40 psi (2.76 bar)
Maximum Working Pressure	150 psi (10.3 bar)
Maximum Temperature	240°F (115°C)
Connection Size	3/4" NPT female
Material	Steel shell with polypropylene liner
Diaphragm Material	Butyl rubber
Height	12.5 inches (31.75 cm)
Diameter	12 inches (30.5 cm)
Weight	12 lbs (5.4 kg)
Installation	Vertical or horizontal (with bracket)
Application	Potable water and hydronic heating systems
Maintenance	Check pre-charge pressure annually; drain if waterlogged
Warranty	5 years limited
Certifications	ASME, NSF 61-9
Repairability	Replaceable diaphragm; core valve replaceable

Frequently Asked Questions - Extrol SX-40V Amtrol

What is the purpose of an expansion tank like the Extrol SX-40V?

It absorbs excess water pressure caused by thermal expansion in closed water heating systems, protecting the water heater and plumbing from damage.

How do I install the Extrol SX-40V?

Install it on the cold water supply line to the water heater, using a 3/4" NPT connection. Ensure the tank is supported and the pre-charge pressure matches the system pressure.

What is the pre-charge pressure and how do I check it?

The factory pre-charge is 40 psi. Use a standard tire gauge on the air valve at the top of the tank while the system is depressurized. Adjust with a compressor if needed.

Can I use this expansion tank for hydronic heating?

Yes, it is suitable for both potable water and hydronic heating systems, as long as temperatures stay below 240°F.

How often should I maintain the Extrol SX-40V?

Check the air pressure annually. If the tank feels heavy or water comes out when you press the air valve, it may be waterlogged and need replacement.

What does 'waterlogged' mean?

A waterlogged tank has lost its air cushion, causing it to fill completely with water. This reduces its ability to absorb expansion and can cause system pressure spikes.

Is the diaphragm replaceable?

Yes, the Extrol SX-40V has a replaceable butyl rubber diaphragm. Contact Amtrol for the service kit.

What is the maximum temperature rating?

The maximum operating temperature is 240°F (115°C). Exceeding this can damage the tank.

Does this tank require a bracket for mounting?

It can be installed vertically or horizontally. A mounting bracket is recommended for horizontal installations to support the weight.

What is the warranty on the Extrol SX-40V?

Amtrol offers a 5-year limited warranty from the date of manufacture.

USER MANUAL Extrol SX-40V Amtrol

Models EX-15 through EX-90

Models SX-30V through SX-160V

Exterior view of two AMTROL EXTROL water pressure vessels (no signage or text beyond branding)

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.

WARNING

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.

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

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.

WARNING

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.

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 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.

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 FOR IMPORTANT GENERAL SAFETY INFORMATION AND ADDITIONAL SPECIFIC SAFETY ALERTS. VISIT www.amtrol.com TO VIEW HELPFUL VIDEOS.

Pre-Installation

1. Visually inspect for any damage. Ensure expansion tank is sized properly for the application (Figure 1).
2. With tank empty of water, remove plastic cap from air stem (Figure 2).
3. Check precharge pressure and adjust if necessary, charging with air to match boiler fill valve setting.
4. Replace cap and tighten snugly, ensuring the cap is flush against the tank surface.

Figure 1.

Boiler Net Output in 1000'S of BTU/Hr.	Type of Radiation
	Finned Tube Baseboard or Radiant Panel	Convectors or Unit Heaters	Radiators Cast Iron	Baseboard Cast Iron
25 EX-15	EX-15 EX-15 EX-15
50 EX-15	EX-15 EX-30 EX-30
75 EX-30	EX-30 EX-30 EX-60
100 EX-30	EX-30 EX-60 EX-60
125 EX-30	EX-60 EX-60 EX-90
150 EX-30	EX-60 EX-90 EX-90
175 EX-60	EX-60 SX-30V SX-30V
200 EX-60	EX-90 SX-30V SX-30V
250 EX-90	EX-90 SX-30V SX-40V
300 EX-90	SX-30V SX-40V SX-40V
350 SX-30V	SX-30V SX-40V SX-60V
400 SX-30V	SX-40V SX-60V SX-60V
450 SX-40V	SX-40V SX-60V SX-90V
500 SX-40V	SX-40V SX-60V SX-90V
550 SX-40V	SX-60V SX-60V SX-90V
600 SX-40V	SX-60V SX-90V SX-90V
650 SX-60V	SX-60V SX-90V SX-90V
700 SX-60V	SX-60V SX-90V SX-90V
750 SX-60V	SX-60V SX-90V SX-110V
800 SX-60V	SX-90V SX-90V SX-110V
850 SX-60V	SX-90V SX-90V SX-110V
900 SX-60V	SX-90V SX-110V	SX-110V
950 SX-90V	SX-90V SX-110V	SX-110V
1,000	SX-90V SX-90V SX-110V		SX-110V
1,100	SX-90V SX-90V SX-110V		SX-130V
1,200	SX-90V SX-90V SX-110V		SX-130V
1,300	SX-90V SX-110V	SX-130V	SX-160V
1,400	SX-110V	SX-130V	SX-160V	SX-160V
1,500	SX-110V	SX-130V	SX-160V	(2)SX-110V

Sizing based on: 12 psig Fill; 30 psig Relief Valve; 180°F Average Temperature.

Figure 2.

FAILURE TO PROPERLY SEAL CAP WILL RESULT IN LOSS OF PRECHARGE CAUSING

Mount tank vertically in downward position only. Ensure the piping can support the entire weight of

Models SX-30V through SX-160V are floor standing and may not be hung from the piping.
Do not install the EXTROL on a dead-end pipe or wherever air can collect. This can cause corrosion
and possible leakage.

Installation

1. Drain the boiler system or isolate the area where the EXTROL will be installed.
2. Install the EXTROL on the supply side of the boiler, on the suction-side of the heating circulator(s) (Figure 3).
3. Pressurize the system and check for leaks. Repair as necessary.
4. Restart the boiler system and check for relief valve discharge. If the relief valve drips, the tank may be improperly charged or undersized.

Figure 3.

graph LR
    A["System Supply"] --> B["Flow-Check Valve"]
    B --> C["Circulator"]
    C --> D["Air Vent"]
    D --> E["Air Purger"]
    E --> F["Fill Valve Assembly"]
    F --> G["Extrrol"]
    G --> H["Inspection Cap"]
    H --> I["Boiler"]
    I --> J["Relief Valve"]
    J --> K["Drain Valve"]
    K --> L["System Return"]

Stand Models: SX-30V through SX-160V

graph LR
    A["System Supply"] --> B["Flow-Check Valve"]
    B --> C["Circulator"]
    C --> D["Air Vent"]
    D --> E["Air Separator"]
    E --> F["Boiler"]
    F --> G["Relief Valve"]
    G --> H["Drain Valve"]
    H --> I["System Return"]
    J["Fill Valve Assembly"] --> K["EXTROL"]
    K --> F

Maintenance

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

Figure 4.

Warranty

EX Models: Seven (7) Year Limited Warranty

SX Models: One (1) Year Limited Warranty

Visit www.amtrol.com for complete warranty details.

WORTHINGTON

INDUSTRIES

1400 Division Road, West Warwick, RI USA 02893

T: 800.426.8765 www.amtrol.com

© 2021 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 #: 9015-941 (05/21)