RADIANT EXTROL
®
is designed for closed, low temperature systems
with a maximum operating temperature of 200° F. The product can be
used in glycol applications and features a plastic liner that is compatible
with barrier and non-barrier tubing.
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. Adjust air precharge to desired system fill pressure. Unit is shipped at
12 PSIG.
4. Replace cap and tighten snugly, ensuring the cap is flush against the
tank surface.
FAILURE TO PROPERLY SEAL VALVE CAP
WILL RESULT IN LOSS OF PRECHARGE
CAUSING PRODUCT TO FAIL.
Installation
1. Drain the boiler system or isolate the area where the Radiant Extrol will
be installed.
2. Install the Radiant Extrol on the supply side of the boiler, on the
suction-side of the heating circulator(s) (Figure 3).
Mount tank vertically only. Ensure the piping
can support the entire weight of the tank when
full of water.
3. Once the Radiant Extrol is installed, re-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.
5. The Radiant Extrol is now operational and will absorb expanded water
during boiler operation.
Operation
1. The Radiant Extrol is installed on the supply-side of the boiler system.
Its sealed-in air precharge prevents water from entering the tank until
the system pressure begins to rise.
2. As the water temperature rises, water enters the Radiant Extrol.
3. As the system cools, the diaphragm is forced downward. Water is
expelled from the Radiant Extrol, back into the heating system.
NOTE:
Although the Radiant Extrol does not have to be installed at the base of
an air purger, this installation is recommended to reduce air in the system
and provide a compact installation. Some method of air elimination is
required to ensure an oxygen-free system.
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 InSight
™
Service Indicator Cap for discoloration (Figure 4) in addition to regular
product inspection. Contact the installer or a plumbing professional if
indicator cap is discolored; tank replacement required. Do not rely on cap
as sole indication of tank condition.
Warranty
RX Models: Seven (7) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
Figure 2.
Remove cap and
charge to system
fill pressure.
Replace InSight™
Service Indicator Cap
and tighten until flush
with tank.
Precharge Adjustment: In-Line Models Shown
Clear / White
Normal
Operation
Discolored
Replace
Tank
Figure 4.
InSight
™
Service Indicator Cap (Inline models only)
Figure 1.
Radiant Extrol Sizing
Feet of
Tubing
Nominal Pex Tubing Size
3/8"
1/2"
5/8"
3/4"
1"
1,000
RX-15
RX-15
RX-15
RX-15
RX-15
5,000
RX-15
RX-15
RX-15
RX-30
RX-30
7,500
RX-15
RX-15
RX-30
RX-30
RX-60
10,000
RX-15
RX-30
RX-30
RX-60
RX-60
14,000
RX-15
RX-30
RX-60
RX-60
18,000
RX-30
RX-60
RX-60
RX-60
22,000
RX-30
RX-60
RX-60
30,000
RX-30
RX-60
Sizing based on: Fill Pressure 12 psig; Relief Pressure 30 psig; Average Temperature 120° F; System
filled with water. For glycol applications, consult AMTROL Technical Support.
Contact Amtrol
Figure 3.
Heating Zone(s)
Air Eliminator
Boiler
Return
System Fill
Relief
Valve
Radiant
EXTROL
InSight Cap
© 2019 Worthington Industries Inc.
Part #: 9015-367 (01/19)
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
