Flexcon FLEX 2 PRO WHV Series Installation Instructions

Operation
This thermal expansion tank is designed to maintain safe water pressures in a domestic water heating system that uti-
lizes a backflow preventer or check valve. It utilizes a butyl rubber diaphragm and polypropylene liner to separate the
system water from the tanks inner walls and pre-charge. The system connection is all stainless steel to prevent corro-
sion and the tank is finished with an appliance quality paint to minimize external corrosion.
What it does
Adding a backflow preventer, water meter with a check valve, or any other no return valve to a domestic water heating
system creates a closed loop system. When water heats up, it expands which can cause unsafe operating pressures
and cause nuisance operation of the water heaters safety relief valve.
Adding a thermal expansion tank to the cold water inlet of the water heater creates a reservoir for the expanded water.
Water safely enters the tank and is released back into the system on demand. This eliminates dripping relief valves and
more importantly makes for a safer system.
This product must be installed by a qualified professional following all local and national plumbing and
electrical codes. Read and understand fully the instructions included here in this manual. This product must
be periodically inspected by a qualified professional for any signs of corrosion or leakage and replaced imme-
diately if these signs are present. Failure to follow these instructions may result in serious injury or death and
or property damage and will void the product warranty.
Explosion Hazard!
This expansion tank is designed for water storage at a maximum pressure of 150 psi and a maximum
temperature of 200
on the water heater. This tank is shipped with a pre-charge of 40 psi and any adjustment to the pre-charge
must be done prior to installation and at ambient temperature. Do not adjust the pre-charge of this tank if the
product is corroded or damaged or shows any signs of diminished integrity. The maximum allowable pre-
charge in this expansion tank is 80 psi. Failure to follow these instructions is UNSAFE and may result in seri-
ous injury or death and or property damage.
This tank is intended for use on potable water systems only and any other use may be dangerous and will
void the warranty. This products performance and lifespan can be significantly impacted by aggressive water
conditions. A water test should be conducted specifically looking for corrosive water, acids and other relevant
water contaminants which if present must be treated appropriately. The system piping must be properly
grounded to earth. A dielectric union may be required in the system. Failure to follow these instructions may
result in serious injury or death and or property damage.
This expansion tank and the associated piping may in time leak. This tank must be installed in a location
where water leakage will not cause property damage and there must be means for adequate drainage. This
tank must not be installed in a location that is subject to freezing. This tank must be installed in the vertical
position. The manufacturer of this product is not liable or responsible for any water damage associated with
the installation and or failure of this product. Failure to follow these instructions may result in personal injury
or property damage.
CALIFORNIA PROPOSITION 65 WARNING!
This product contains a chemical known by the State of California to cause cancer and birth defects or other
reproductive harm.
(California installer-California law requires that this notice be given to the consumer/end user of this product.)
For more information, contact the manufacturer at www.flexconind.com.
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
o
F. A properly sized pressure relief valve set at a maximum of 150 psi must be installed
Installation Instructions
WHV Series
Thermal ExpansionTank
April 30, 2014
620.0044 Rev C