PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
EXPLOSION HAZARD. Failure to follow instructions in the accompanying product manual can cause rupture or explosion, possibly causing serious or fatal injury,
leaking or flooding and/or property damage.
FAILURE TO PROPERLY SEAL VALVE CAP 
WILL RESULT IN LOSS OF PRECHARGE CAUSING PRODUCT TO FAIL.
Location of EXTROL® Expansion Tanks
DO NOT LOCATE THIS PRODUCT WHERE 
LEAKING OR FLOODING COULD CAUSE DAMAGE TO THE SURROUNDING PROPERTY.
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.
The AMTROL expansion tank may be placed in any convenient position within the mechanical room (or building). If multiple tanks are installed, they should all be on the same level.
Point of Connection
Unlike a conventional tank, the EXTROL sealed air cushion does not require replenishment so DO NOT connect to an air separator or other air collection device.
As with any expansion tank, it is recommended that the EXTROL be connected to the suction side of the pump. This will prevent the pump head from becoming subtractive which may result in entry of air and vapor formation at high points in the system.
By connecting the EXTROL on the boiler return, displacement of coolest system water into tank is ensured reducing energy waste.
Low pressure drop components such as air separators and boilers may be placed between point of connection and pump suction if desired. System design will dictate the feasibility of this.
Natural convection losses and the entry of air into tanks are eliminated by connection to the side or underside of main pipe. The piping should be pitched up and away from the EXTROL to eliminate any potential air traps.
Installation
THIS PRODUCT MUST BE INSTALLED BY A
QUALIFIED PROFESSIONAL.
1.Note location of system connection, air charge valve and drain connection on tank.
2.Remove the plug or pipe cap from the system connection.
3.Remove the 1 1/2” NPT plug covering the air charge valve.
4.Before making any connection to the tank, check the tank and air charge (use an accurate pressure gauge). The air pressure must be equal to the minimum system pressure at the tank location.
IMPORTANT: If increasing
55 psig the following steps must be followed:
a. Tank must be connected to the system with the isolation valve open.
b. System must be pressurized to
c. Isolation valve needs to be shut.
d.
e. Open isolation valve and start up system.
Failure to follow these steps could result in damage to the bladder and void all warranties.
5.After making sure the air charge is correct, replace the valve cap and the 1 1/2” plug over the air valve.
6.The EXTROL may now be piped to the system (use the suggested EXTROL piping diagrams on the next page).
7.Using the table below, select appropriate pipe size. Connection to each EXTROL must have a lock shield gate valve and union to allow isolation and removal if required. Make up and fill valves, whether manual or automatic, should be tied into the connecting line. This will ensure that pump operation will not affect valve operation.
Operational Limits
Maximum Operating Pressure: As stamped on nameplate
Maximum Operating Temperature: 240 °F
Minimum Operating Temperature: 35°F
If unit is being installed in a glycol system where minimum temperatures fall below 35°F, contact the AMTROL technical service department at (401)
Operating Instructions
1.Check the expansion tank
2.If the tank
a.Check the expansion tank air pressures at the
b.If the pressure is low, charge the tank with nitrogen gas or with oil free compressed air. Check the pressure frequently during this process as you would when filling a tire with air.
DANGER: Excessive pressure can cause tank to 
explode. Exercise care when filling a tank with air so the pressure does not exceed that required or does not exceed the working pressure of the tank as stamped on the
nameplate. Failure to follow these instructions will result in serious personal injury or death and property damage.
3.If, after the system has been filled with water and operating, it is found that the expansion tank
a.Turn off the heat source and allow the system water to cool to ambient temperature.
IMPORTANT: Expansion tank cannot be properly air charged other than at ambient temperature.
b.Close the
c.Open the drain valve to empty the water from the tank.
d.Check the tank air pressure at the
e.Refer to 2b above.
f.Close the drain valve, open the
g.Relock the
Firing Rate |
| Length of Pipe Connecting | |
of Boiler |
| Tank to System: |
|
MBTU/H | Below 11' | 11' – 30' | 31' – 100' |
2,000 | 1/2" | 3/4" | 1" |
4,000 | 3/4" | 1" | 11/4" |
8,000 | 1" | 11/4" | 11/2" |
12,000 | 11/4" | 1 1/2" | 2" |
16,000 | 11/4" | 2" | 21/2" |
20,000 | 11/2" | 2" | 21/2" |
Warranty
L Series Models: One (1) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.