Amtrol THERM-X-TROL STL (CL) SERIES Guide

Diffuser
Air Charge
Lifting Ring
Elbow
Blind Flange
Flange Ring
Stand
Bladder
Adapter
Nut
Drain
Lifting Ring
THERM-X-TROL® STL (CL) SERIES
FOR USE ONLY WITH POTABLE WATER SYSTEMS
REPLACEMENT BLADDER INSTRUCTIONS
READ CAREFULLY THE PRODUCT
INSTALLATION INSTRUCTIONS. FAILURE TO
FOLLOW THE INSTRUCTIONS AND WARNINGS 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.
EXPLOSION OR RUPTURE HAZARD. THE
EXPANSION TANK MUST BE OPERATED SO
THAT THE PRESSURE DOES NOT EXCEED THE MAXIMUM
WORKING PRESSURE.
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.
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.
Use only with potable water systems. Do not
operate in a setting with freezing temperatures or
where the temperature can exceed 240°F and do not exceed the
maximum working pressure specified in the Manual. Mount vertically only.
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.
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.
Models ST-35L(CL) through ST-600L(CL)

Installation
THIS PRODUCT MUST BE INSTALLED
BY A LICENSED PROFESSIONAL.
1. Be sure to have a complete bladder kit (bladder kit consists of
blind flange, bladder support pipe and bladder assembly).
2. Isolate tank from system.
3. Drain water from bladder.
4. Remove air valve core to bleed remaining air charge.
5. Remove drain plug. (Figure 1).
6. Disconnect system connection.
7. Unbolt blind flange from tank and pull out bladder kit from
tank. (Figure 2).
8. Wash down inside walls of tank as necessary.
9. Mop up remaining water.
10. Dry out inside of tank (reversed vacuum cleaner or air line
from compressor).
11. Clean out any remaining dirt.
12. Examine interior of tank for any rust blisters and remove them.
13. Fold new bladder around bladder support pipe. (Figure 3).
14. Insert new bladder kit into bottom of tank. Use existing bolts
from tank flange. (Figure 4).
15. Using water from spray bottle, lubricate bladder to make it
easier to fit through flange opening. (Figure 5).
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.

16. Insert bladder neck into bottom of tank. (Figure 6).
17. Pull out flange neck of bladder and fit on blind flange.
Bladder neck becomes gasket for flange. (Figure 7).
18. Align elbow with hole in skirt to make system connection.
19. Insert bolts by hand into flange and tighten in a cross pattern
to 40-50 foot-pounds. (Figure 8).
20. Screw in drain plug using a liberal amount of Tite-Seal
compound 55 or equal. (This connection must be absolutely
air-tight).
FAILURE TO PROPERLY SEAL WILL
RESULT IN LOSS OF PRECHARGE
CAUSING TANK TO FAIL.
21. Install air valve core. Charge tank to equal system pressure
using dry air or nitrogen (Figure 9).
DANGER! EXPLOSION HAZARD. IF YOU
ADJUST THE PRE-CHARGE PRESSURE
OR ADD PRESSURE TO A TANK THAT IS CORRODED OR
DAMAGED OR WITH DIMINISHED INTEGRITY, THE TANK
CAN BURST OR EXPLODE, POSSIBLY CAUSING SERIOUS
OR FATAL PERSONAL INJURY AND/OR PROPERTY
DAMAGE.
• ONLY ADJUST THE PRE-CHARGE AS DESCRIBED IN
THIS MANUAL WHEN THE TANK IS NEW OR WHEN THE
INTEGRITY OF THE TANK AND LACK OF INTERNAL OR
EXTERNAL CORROSION IS CONFIRMED.
• ONLY LICENSED PROFESSIONALS SHOULD CHECK,
ADJUST OR RE-CHARGE THE PRE-CHARGE OF TANKS.
IMPORTANT: If increasing pre-charge pressure above
55 psig the following steps must be followed:
a.Tank must be connected to the system with isolation
valve open.
b.System must be pressurized to 55-60 psig or slightly
higher than the pre-charge setting of the tank.
c.Isolation valve needs to be shut.
d.Pre-charge pressure of tank can now be increased
to the recommended high pressure setting.
e.Bring system up to pressure, and then open the
isolation valve to the tank.
Failure to follow these steps could result in damage to
the bladder and void all warranties.
22. Using soapy water, check the drain fitting threads, air valve
core and flange joint for leakage.
23. Connect tank to system. Open fill-valve and check operation.
Always pre-charge before completing this step.
FAILURE TO FOLLOW ALL WARNINGS
MAY RESULT IN SERIOUS INJURY OR
FATAL PERSONAL INJURY AND/OR PROPERTY DAMAGE
AND WILL VOID THE WARRANTY.
Warranty
Replacement Bladder: One (1) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.
Figure 6
Figure 7
Figure 8
Figure 9
Required Tooling & Supplies:
1. New AMTROL Bladder Kit
2. Source of Compressed Dry Air or Nitrogen
3. Light with 20 ft. Cord
4. Power Extension Cord (as required)
5. Chain Block
6. Pressure Gauge and Air Valve Tool
7. Spray Bottle

© 2019 Worthington Industries Inc. Part #: 9017-121 (06/19)
One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765 www.amtrol.com