Extrol SX-110V - Water heaters and boilers Amtrol - Free user manual and instructions

Product Type	Expansion tank for closed hydronic heating systems
Brand	Amtrol (Worthington Industries)
Model	Extrol SX-110V
Application	Residential closed hydronic systems (not for domestic water or open systems)
Max Operating Temperature	240°F (115°C)
Max Working Pressure	30 psig (relief valve setting; refer to local codes)
Precharge Pressure	Match boiler fill valve setting (typically 12 psig); adjustable at installation
Mounting	Floor standing (vertical position); models SX-30V through SX-160V are floor standing
Sizing	Based on boiler output (BTU/hr) and radiation type; see sizing chart in manual
Warranty	1 Year Limited Warranty (SX models)
Maintenance	Yearly inspection by licensed professional; check precharge when tank is isolated and empty
Safety Features	Requires relief valve; do not expose to freezing or temps above 240°F; use proper safety equipment
Material	Steel (typical for expansion tanks)
Inspection Cap	Monitor for discoloration; if discolored, replace tank
Compliance	Follow local and state codes; National Plumbing Code and National Electric Code

Frequently Asked Questions - Extrol SX-110V Amtrol

What is the purpose of the Amtrol Extrol SX-110V expansion tank?

The Extrol SX-110V is designed to absorb thermal expansion in closed hydronic heating systems, preventing pressure buildup that could damage the system. It should only be used in residential closed hydronic systems, not on domestic water or open heating systems.

How do I determine the correct size expansion tank for my boiler?

Use the sizing chart in the manual. It depends on the boiler's net output in BTU/hr and the type of radiation (e.g., finned tube baseboard, convectors, radiators). For example, a 750,000 BTU/hr boiler with cast iron baseboard requires an SX-110V. Always consult a licensed professional.

What is the precharge pressure for the SX-110V and how do I adjust it?

The precharge pressure should match the boiler fill valve setting, typically 12 psig. With the tank empty of water, remove the plastic cap from the air stem, check pressure with a gauge, and charge with air as needed. Replace the cap snugly flush against the tank surface.

Can the Extrol SX-110V be installed on a domestic water system?

No, it is only for closed hydronic heating systems. For domestic water systems, use a Therm-X-Trol or Therm-X-Span. For radiant heating without air elimination equipment, use a Radiant EXTROL.

Where should the expansion tank be installed in the heating system?

Install the EXTROL on the supply side of the boiler, on the suction side of the heating circulator. Models SX-30V through SX-160V are floor standing and should not be hung from piping. Do not install on a dead-end pipe or where air can collect.

How often should I inspect and maintain the expansion tank?

A licensed professional should check the complete system, including the expansion tank, yearly and more frequently as the system ages. Check the precharge when the tank is isolated and empty. Monitor the inspection cap for discoloration; if discolored, replace the tank.

What safety precautions should I follow when installing the SX-110V?

Follow all warnings in the manual: use only in residential closed hydronic systems, install a relief valve, do not expose to freezing or temperatures above 240°F, and do not adjust precharge except during installation or inspection. Use proper safety equipment and hire a licensed professional.

What does the inspection cap discoloration indicate?

Discoloration of the inspection cap (Figure 4) may indicate internal corrosion or tank failure. If discolored, contact a plumbing professional immediately; the tank likely needs replacement. Do not rely solely on the cap as an indicator.

What is the warranty on the Extrol SX-110V?

The SX models, including the SX-110V, have a 1 Year Limited Warranty. EX models have a 7 Year Limited Warranty. Visit www.amtrol.com for complete warranty details.

Can the SX-110V be exposed to chlorinated or aggressive water?

Chlorine and aggressive water can significantly reduce the product's life. Test water for corrosive elements and treat accordingly. The product may expose you to lead, known to cause cancer and reproductive harm (California Prop 65).

USER MANUAL Extrol SX-110V 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)