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PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY FOR
IMPORTANT GENERAL SAFETY INFORMATION AND ADDITIONAL SPECIFIC SAFETY ALERTS.
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
Finned Tube
in 1000'S
Baseboard or
of BTU/Hr.
Radiant Panel
25
EX-15
50
EX-15
75
EX-30
100
EX-30
125
EX-30
150
EX-30
175
EX-60
200
EX-60
250
EX-60
300
EX-90
350
SX-30V
400
SX-30V
450
SX-40V
500
SX-40V
550
SX-40V
600
SX-40V
650
SX-60V
700
SX-60V
750
SX-60V
800
SX-60V
850
SX-60V
900
SX-60V
950
SX-90V
1,000
SX-90V
1,100
SX-90V
1,200
SX-90V
1,300
SX-90V
1,400
SX-110V
1,500
SX-110V
Sizi ng based on: 12 psig Fill; 30 psig Relief Valve; 200°F Average Temperature.
Figure 2.
Precharge Adjustment: In-Line Models Shown
Remove cap and
charge to system
fill pressure.
FAILURE TO PROPERLY SEAL CAP WILL
RESULT IN LOSS OF PRECHARGE CAUSING
PRODUCT TO FAIL.
Mount tank vertically in downward position only.
Ensure the piping can support the entire weight of
the tank when full of water.
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.
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.
VISIT www.amtrol.com TO VIEW HELPFUL VIDEOS
Type of Radiation
Convectors
Radiators
Baseboard
or Unit
Cast Iron
Cast Iron
Heaters
EX-15
EX-15
EX-15
EX-30
EX-30
EX-30
EX-30
EX-60
EX-60
EX-60
EX-60
EX-90
EX-60
EX-90
EX-60
EX-90
EX-90
EX-90
SX-30V
SX-30V
SX-40V
SX-30V
SX-40V
SX-60V
SX-40V
SX-40V
SX-60V
SX-40V
SX-60V
SX-90V
SX-40V
SX-60V
SX-90V
SX-60V
SX-60V
SX-90V
SX-60V
SX-90V
SX-90V
SX-60V
SX-90V
SX-90V
SX-60V
SX-90V
SX-90V
SX-60V
SX-90V
SX-110V
SX-90V
SX-90V
SX-110V
SX-90V
SX-90V
SX-110V
SX-90V
SX-110V
SX-110V
SX-90V
SX-110V
SX-110V
SX-90V
SX-110V
SX-110V
SX-90V
SX-110V
SX-130V
SX-90V
SX-110V
SX-130V
SX-110V
SX-130V
SX-160V
SX-130V
SX-160V
SX-160V
SX-130V
SX-160V
(2)SX-110V
Replace cap and
tighten until flush
with tank.
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.
In-Line Models: EX-15 through EX-90
Flow-Check
Valve
EX-15
System
EX-30
Supply
EX-60
EX-60
EX-90
EX-90
EX-90
EX-90
EX-90
Stand Models: SX-30V through SX-160V
Flow-Check
Valve
System
Supply
Fill Valve Assembly
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.
InSight
Service Indicator Cap (Inline models only)
™
Normal
Operation
Clear / White
Warranty
EX Models: Five (7) Year Limited Warranty
SX Models: One (1) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.
.
Air Vent
Circulator
Air Purger
Fill Valve Assembly
EXTROL
Inspection
Cap
Air Vent
Circulator
Air
Separator
EXTROL
System
Return
Relief
Valve
Boiler
Drain Valve
System
Return
Relief
Valve
Boiler
Drain Valve
Replace
Tank
Discolored
Part #: 9015-941 (01/19)
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