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POTABLE WATER AND RADIANT HEATING WARNING.
THIS PRODUCT MUST NOT BE USED IN RADIANT
HEATING, POTABLE WATER OR OPEN SYSTEMS OF
ANY KIND. THESE SYSTEMS CONTAIN OXYGENATED WATER WHICH WILL
CAUSE INTERNAL CORROSION AND PREMATURE PRODUCT FAILURE. USE
A THERM-X-TROL
®
FOR POTABLE WATER SYSTEMS AND A RADIANT
EXTROL™ FOR RADIANT HEATING SYSTEMS. MOUNT VERTICALLY ONLY.
DO NOT INSTALL ON DEAD-END PIPE.
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 QUALIFIED PROFESSIONAL IMMEDIATELY. CURRENT
COPIES OF THE PRODUCT MANUAL CAN BE VIEWED AT
WWW.AMTROL.COM. USE PROPER SAFETY EQUIPMENT WHEN INSTALLING.
FAILURE TO PROPERLY SEAL WILL RESULT IN LOSS
OF PRECHARGE CAUSING PRODUCT TO FAIL.
GENERAL SAFETY INFORMATION - ADDITIONAL
SPECIFIC SAFETY ALERTS APPEAR IN THE
FOLLOWING INSTRUCTIONS.
CALIFORNIA PROPOSITION 65 W
ARNING: THIS PRODUCT CONTAINS A
CHEMICAL KNOWN BY THE STATE OF CALIFORNIA TO CAUSE CANCER AND
TO CAUSE BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM. (CALIFORNIA
INSTALLER/CONTRACTOR - CALIFORNIA LAW REQUIRES THAT THIS NOTICE
BE GIVEN TO CONSUMER/END USER OF THIS PRODUCT.) FOR MORE
INFORMATION: WWW.AMTROL.COM/PROP65/HTM.
Location of EXTROL
®
Expansion
Tanks
DO NOT LOCATE THIS PRODUCT WHERE LEAKING
OR FLOODING COULD CAUSE DAMAGE TO THE
SURROUNDING PROPERTY.
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.
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
5. After making sure the air charge is correct, replace 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 (non-glycol application)
If unit is being installed in a glycol system where minimum temperatures
fall below 35°F, contact the AMTROL technical service department at
(401) 535-1216.
Operating Instructions
1. Check the expansion tank pre-charge before the system is filled with
water. The charge is 12 psig unless noted otherwise on the tank label.
Check to make sure this is the correct pre-charge pressure specified
for the system.
2. If the tank pre-charge pressure needs to be changed on a dry system
follow the following procedure:
a. Check the expansion tank air pressures at the pre-charge
connection with an accurate tire type pressure gauge. The
pre-charge connection is the same kind of connection
found on automobile tires.
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.
3. If, after the system has been filled with water and operating, it is found
that the expansion tank pre-charge must be changed use the
following procedure:
a. Turn off the heat source and allow the system water to cool
to ambient temperature.
b. Close the lock-shield valve in the tank-to-system piping.
c. Open the drain valve to empty the water from the tank.
d. Check the tank air pressure at the pre-charge connection
with an accurate tire type air gauge.
e. Refer to 2b above.
f. Close the drain valve, open the lock-shield valve and turn on
the heat source.
g. Relock the lock-shield valve.
IMPORTANT: Expansion tank cannot be properly air
charged other than at ambient temperature.
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” 1 1/4”
8,000 1” 1 1/4” 1 1/2”
12,000 1 1/4” 1 1/2” 2”
16,000 1 1/4” 2” 2 1/2”
20,000 1 1/2” 2” 2 1/2”
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.