Flexcon Flex 2 Pro PH Series User manual

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This thermal expansion tank is designed to maintain safe
water pressures in a domestic water heating system that
utilizes a backflow preventer or check valve. It features a
butyl rubber diaphragm and polypropylene liner to sepa-
rate the system water from the tank’s inner walls and
pre-charge. The system connection is stainless steel
and the tank is finished with an appliance quality paint to
minimize corrosion.
  
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
heater’s 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 enters the tank and is released back into the
system on demand. The goal is to avoid dripping relief
valves and improve the safety of the system.
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       
      

)- PH Series tanks are certified to NSF Standard 61
Domestic Hot, but are suitable for temperatures up to 200oF.
This product
must be in-
stalled by a .&$!$ +)! ,,$)(& fol-
lowing all local and national plumbing and
electrical codes. Read and understand
fully the instructions included here and
those on the Flexcon website which are
updated on a regular basis. This product
must be inspected annually by a qualified
professional for any signs of corrosion or
leakage and replaced immediately 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 F.
A properly sized pressure relief valve set at a maximum of 150 psi must
be installed in the system. 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. Do not adjust the pre-charge of the expansion
tank with the system under pressure. Failure to follow these instructions is
UNSAFE and 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 that allows for easy access, visual inspection and
where water leakage will not cause property damage. Installation must
include a 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 will void the
warranty and may result in personal injury 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 product’s performance and
lifespan can be significantly and adversely impacted by aggressive water
conditions. A water test should be conducted at regular, periodic intervals
specifically looking for corrosive water, acids and other relevant water
contaminants which if present must be treated immediately and appropri-
ately. The system piping must be properly grounded to earth and a di-
electric union is recommended in the installation. Failure to
follow these
instructions may result in serious injury or death and 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.
These instructions and warnings are subject to periodic updates on the
Flexcon website ///!& 0)($()' and should be regularly reviewed
by the consumer for important safety and instruction updates.
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300 Pond S ree , Randolph, Massachuse s 02368, Call 1.781.986.2424, Fax [phone], www.flexconind.com © 2014 Rev. 1.23
          
'*)+-(- Read carefully the installation, operating and maintenance instructions manual (“ anual”) to avoid serious personal injury and/or
property damage and to ensure safe use and proper care of this Product.
++(-1 - Warranty is extended to all purchasers of the new product. The warranty is non-transferable. Flexcon warrants to the purchaser or first
user of the new Product that at the time of manufacture, the Product is free from defect in material or workmanship for one (1) year from the date
of manufacture. Any warranty claim must be made within one (1) year (unless another time period is set forth in the anual), measured from the
date of manufacture.
In the event of a breach of the foregoing warranty and upon proper and timely notification to Flexcon, Flexcon will at its option either: make
repairs to correct any defect in material or workmanship, or supply and ship either new or used replacement parts or products. Flexcon will not
accept any claims for, nor will Flexcon be responsible for, any other costs including labor.
0 &.,%)(, - This warranty does not cover any failure or problem unless it was caused by a defect in material or workmanship. In addition, this
warranty shall not apply:
2If the Product is not correctly installed, operated, repaired or maintained as described in the anual provided with the Product.
2To any failure or malfunction resulting from (i) misuse or abuse, (ii) improper or negligent handling, shipping (by anyone other than Flexcon),
storage, use or operation, or (iii) damages to the tank caused by lightning, floods, fire, freezing or any other environmental condition.
2To damages caused by any unauthorized alteration to the Product, or any attempt to repair tank leaks or parts.
2To any failure or problem resulting from the use of the Product for any purpose other than those specified in the anual.
2If the Product is used anywhere except the United States, its territories or possessions, or Canada.
2To labor costs, shipping charges, service charges, delivery expenses, administrative fees or any costs incurred in removing or reinstalling the Products.
2To any claims submitted to Flexcon or a Flexcon authorized distributor or dealer more than 30 days after expiration of the applicable warranty time
period described in this Warranty;
2To any repair or replacement costs not authorized in advance by Flexcon.
++(-1 %'%--%)(, - All implied warranties including the implied warranties of merchantability and fitness for a particular purpose are
specifically disclaimed.
%'%--%)(,)#"'"!%", - The remedies contained in this warranty are the purchaser’s or first user’s exclusive remedies. In no circumstances
will Flexcon be liable for more than, and purchaser-first user’s remedies shall not exceed, the price paid for the Product. In no case shall Flexcon
be liable for any special, indirect, incidental or consequential damages, whether resulting from non-delivery or from the use, misuse, or inability to
use the Product or from defects in the product or from Flexcon’s own negligence or other tort. These exclusions apply regardless of whether such
damages are sought for breach of warranty, breach of contract, negligence, strict liability, in tort or under any other legal theory. Excluded damages
include, but are not limited to, inconvenience, loss or damage to property, mold, loss of profits, loss of savings or revenue, loss of use of the
Products or any associated equipment, facilities, buildings or services, downtime, and the claims of third parties including customers.
$-))#)./"+)&"')/"+"!1$%,++(-1 – You must notify the authorized Flexcon distributor or dealer who sold you
the Product within 30 days of the event leading to the Warranty claim. Any covered Warranty service must be authorized by the Flexcon distributor
or dealer which sold you the Product. If you do not receive a prompt response, call Flexcon directly at 781.986.2424. Notice of a Warranty claim
should be submitted within 60 days of the event leading to the claim by the authorized distributor/dealer to Flexcon at the following address:
Flexcon Industries, Warranty Claim Dept., P.O. Box 782, Randolph, A 02368
Before Flexcon determines to provide any replacement part or Product, it may, as a pre-condition to making such a determination, require that the
warranty claimant ship the Product, postage prepaid, to an authorized Flexcon distributor, or to Flexcon, and provide proof of purchase evidenced
by the original sales receipt.
"*& "'"(-+)!. -++(-1 - In case of replacement of a Product or any component part, Flexcon reserves the right to make changes in
the design, construction, or material of the substitute components or products, which shall be subject to all of the terms and limitations of this
Warranty, except that the applicable warranty periods shall be reduced by the amount of time the warranty claimant owned the product prior to
submitting notification or the warranty claim.
Owners Record Keep for later use
Serial number (see tank data label at bottom of tank): __________________________________________________________________________
odel (see tank data label at bottom of tank): _______________________________________________________________________________
Date Installed: _________________________________________________________________________________________________________
Installer Name: _________________________________________________________________________________________________________
Telephone number: ____________________________________________________________________________________________________
Retain copy of cancelled check and installation receipt
         
300 Pond S ree , Randolph, Massachuse s 02368, Call 1.781.986.2424, Fax [phone], www.flexconind.com © 2014 Rev. 1.23

         
  
This expansion tank and the entire system must be checked annually by a qualified professional.
Visually examine the tank and its connection to the system piping looking for any signs of water leakage or corrosion on the
exterior of the tank or the connection.
If this expansion tank shows any visible signs of leaking, corrosion or rusting, the tank must be replaced
immediately to avoid personal injury or property damage. Do not adjust the tank air pressure if there
are any signs of corrosion on the tank. Failure to follow these instructions may result in serious injury or death and or
property damage.

Sizing based on water heater recovery from 40F, water supply pressure of
60 SIG, and relief valve set at 150 SIG. Adjust tank precharge to equal
incoming water pressure.
Water Heater Maximum Water Temperature
Size/Volume 130o F 140o F 160o F 180o F
30 GALLONS
40 GALLONS
50 GALLONS
60 GALLONS
80 GALLONS
100 GALLONS
120 GALLONS
150 GALLONS
175 GALLONS
H 5
H 5
H 5
H 5
H 5
H 12
H 12
H 12
H 12
H 5
H 5
H 5
H 5
H 12
H 12
H 12
H 12
H 25
H 5
H 5
H 5
H 5
H 12
H 12
H 12
H 25
H 25
H 5
H 5
H 12
H 12
H 12
H 25
H 25
H 25
H 25
QUICK SIZING CHART
A
B
C
Maximum working pressure 150 psig. Maximum working temperature, internal & external 200o F. Tank pre-charge 40 psig.
NOTE: h Series tanks are certified to NSF Standard 61 Domestic Hot, but are suitable for temperatures up to 200o F.
Model Total Tank A B C Total Weight
Volume Height Diameter Connection
gal liters in cm in cm lbs kilos
H 5
H 12
H 25
2.1
4.8
9.0
8
18
32
11.6
14.5
18.9
30.0
37.0
48.1
20.0
28.0
31.8
3/4” MN T
3/4” MN T
3/4” MN T
DIMENSIONS & CA ACITIES
5.0
10.0
15.40
2.3
4.6
7.0
8.00
11.00
12.50
MATERIALS OF CONSTRUCTION
Tank: 16 gauge cold rolled steel
Finish: Appliance quality paint for indoor or outdoor installation
Water chamber: 100% butyl rubber, lined with polypropylene
Connection: Stainless Steel
Testing: High pressure, seam weld, helium, final
precharge check
Air valve: Brass valve with o-ring seal
Warranty: One year
.
.
.
.
.
.
.
Rev. 5.13

Select a location where a water leak will not cause prop-
erty damage and provides adequate means for water
drainage. This expansion tank and the associated piping
may in time leak. The manufacturer is not responsible for
any water damage that may occur in association with the
expansion tank installation.
Disconnect or shut off the electrical
power source to the water heater.
Shut off the water supply to the system and remove all
water pressure from the system. Failure to follow these
instructions may result in serious injury or death and or
property damage.
The tank is designed to be supported by the system
piping. ake sure that there is adequate means of
supporting the system piping and if necessary add
strapping, brackets or pipe hangars.
DO NOT INSTALL THIS EXPANSION TANK IN THE
HORIZONTAL POSITION.
Install the expansion tank in the incoming water line to the
water heater between the water heater and the backflow
preventer or check valve (see Fig. 1). Adequate thread
sealant (pipe dope) must be added to ensure a leak free
installation. 
Before turning on the water supply to the system, open a
hot water faucet to prevent any damage to the water
heater and remove air from the system piping. Turn on the
water supply and inspect the installation for water leaks
paying close attention to the connection between the ex-
pansion tank and the piping.
Follow the water heater manufacturer’s instructions for
proper start-up of the heater and the system.
 

 
Visually inspect the product for any signs of damage that may have occurred during transportation. If the tank is dented, bent
or scratched, return the product to the original purchase point for replacement.
 
This expansion tank is shipped from the factory with a pre-charge of 40 psi. Any adjustments to the factory pre-charge
must be done prior to initial tank installation and with 0 psi pressure on the system. DO NOT ADJUST THE PRE-CHARGE
OF THE EXPANSION TANK WITH THE SYSTE UNDER PRESSURE!
The expansion tank should be pre-charged to the incoming system water pressure but must not exceed 80 psi. $&.+ -)
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Remove the protective cap from the air valve.
Check the tank pre-charge pressure using a standard tire pressure gauge.
If required add air to the tank using a manual bicycle tire pump until the proper pre-charge pressure is reached.
Replace the protective cap on the air valve.

fig. #1