FLOWTECH flowvess User manual

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First Publication Date: 01/09/2020
Revision:
Revision Date:
OPERATION AND
MAINTENANCE MANUAL
HWG Expansion Vessel
flow vess
©

CONTENTS
OPERATION & MAINTENANCE
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1.1 Proper Vessel Location 7
1.2 System Connection 7
1.3 Adjusting Precharge Pressure 8
1.4 Typical Installations 8
1.5 Multiple Tank Installation 9
1.6 Pump Run Control Operating Principles 9
1.7 Replacing Plain Steel Tanks with Expansion Vessels 10
2. Thermal Expansion Tank Installation 10
2.1 Precharge 10
2.2 Thermal Expansion Tank Location 10
2.3 System Connection 10
2.4 Solar Heating System Connections 11
2.5 Thermal Expansion Operating Principles 11
3. Disposal 11
4. Troubleshooting 11

Definitions of Safety Warnings and
Precautions
WARNING!
Indicates a potentially hazardous situation which, if
not avoided, can result in serious injury or death.
 CAUTION!
Indicates a potentially hazardous situation which, if
not avoided. Can result in minor to moderate injury, or
serious damage to the product.
General
Information
These instructions are to assist in the installation of the flowvess HWG Expansion Vessels
please follow them carefully.
If, having read this Operation & Maintenance Manual, there is any doubt about any aspect of
the installation please don't hesitate to contact our technical team.
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Safety
Information
It is essential that correct and safe working practices are adhered to at all times when installing,
operating and/or maintaining any piece of equipment. Always consult safety data sheets, operating
and maintenance manuals, Health & Safety legislation and recommendations and specific
requirements of any equipment manufacturer, site controller, building manager or any other persons
or organisation relating to the procurement, installation, operation and/or maintenance of any piece
of equipment associated or in conjunction with any product provided by flowech Water Solutions.
This document is intended for ALL installers, operators, users and persons carrying out maintenance
of this equipment and must be kept with the equipment, for the life of the equipment and made
available to all persons at all times. Prior to carrying out any work associated with the set it is essential
that the following sheets are read, fully understood and adhered to at all times.
Equipment must only be installed, operated, used, and/or maintained by a competent person. A
competent person is someone who is technically competent and familiar with all safety practices
and all of the hazards involved.
Any damage caused to any equipment by misapplication, mishandling or misuse could lead to risk of
Electrocution, Burns, Fire, Flooding, death or injury to people and/or damage to property dependent
upon the circumstances involved. flowech Water Solutions accepts no responsibility or liability for
any damage, losses, injury, fatalities or consequences of any kind due to misapplication, mishandling
or misuse of any equipment, or as a result of failure to comply with this manual.
Failure to install, operate, use or maintain the equipment in accordance with the information contained
within this document could cause damage to the equipment and any other equipment subsequently
connected to it, invalidating any warranties provided by flowech Water Solutions to the buyer.
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Safety Warnings &
Precautions
These instructions should be read and clearly understood before working on the system. Please
read this manual carefully and all of the warning signs aached before installing or operating the
equipment keep this manual handy for your reference. This equipment should be installed, adjusted
and serviced by trained and qualified personnel. Failure to observe this precaution could result in
bodily injury.
 WARNING! - It is strongly recommended that the system is protected by a suitable pressure
relief valve set at or below the maximum tank pressure rating. Failure to install a relief valve may result
in tank explosion in the event of a system malfunction or over pressurization, resulting in property
damage, serious personal injury or death.
 WARNING! - If the pressure tank leaks or shows signs of corrosion or damage do not use it.
CAUTION! - It is strongly recommended that all electrical equipment conforms to National
Electrical Codes and local regulations. Only qualified personnel should perform installation,
alignment and maintenance. The manufacturer reserves the right to alter the technical data in
order to make improvements or update information.
CAUTION! - Failure to observe these rules will render the guarantee invalid. The same applies
to repair jobs and/or replacement. Your legal rights are not aected.
CAUTION! - The manufacturer declines all responsibility in the event of damage or injury
caused as a result of tampering with the equipment.
CAUTION! - To prevent personal injury, ensure all water pressure is released from the pressure
system prior to work being performed. Ensure pumps are disconnected and / or electrically
isolated.
Customer / Contractor
Responsibilities
It is the responsibility of the customer and/or the contractor:
• To ensure that anyone working on the equipment is wearing all necessary protective gear
and/or clothing.
• Is aware of appropriate health & safety warnings.
• Has read the information in this section of the manual.
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

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The Flowvess HWG-V are long-life pressure tanks ideally suited for controlling the pressure in
domestic as well as industrial applications.
Flowvess HWG-V for use in cooling or heating systems.
Nameplate
Pos. Description
1 Product Number
2 Type Designation
3 Serial Number
4 Model Number
5 Production Code (year and week)
6 Maximum System Pressure (Bar)
7 Production Company
8 Notified Body
9 Marking
10 Total Tank Volume
11 Eective Tank Volume
12 Precharge Pressure (Bar)
13 Maximum Operating Temperature
14 Minimum Operating Temperature
Installation
Warning - Installation and operation must comply with local regulations and accepted codes
of good practice.
Before installation, check the following:
• Do the specifications of the Flowvess HWG-V tank correspond to the order?
• Are all visible parts intact?
• Is the maximum system pressure lower or equal to the maximum operating pressure for the
Flowvess HWG-V tank? See tank nameplate.
Liing the tank
If the Flowvess HWG-V tank incorporates liing eyes, all liing eyes must be used.

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Location
Always install the Flowvess HWG-V tank in the discharge pipe as close to the pump as possible.
Install the Flowvess HWG-V tank in a frost-free room. It must be possible to inspect the Flowvess
HWG-V tank from all sides.
The gas-filling valve, water shut-o and discharge must be accessible, and the nameplate must be
visible.
Install the Flowvess HWG-V tank so that it is not stressed by the pipework. If vibrations are likely to
occur, we recommend that the Flowvess HWG-V tank is installed so that vibrations are absorbed.
We recommend to follow these steps:
1. Li and position the Flowvess HWG-V tank.
2. Level as required (horizontally and vertically).
3. Secure the Flowvess HWG-V tank.
4. Connect the pipes and fiings.
5. Check/adjust the pre-charge pressure.
6. Start the pump or application.
No additional loads from the piping system or equipment are allowed.
Floor installation
Large Flowvess HWG-V tanks must be secured to the floor by means of bolts. Use bolts, washers
and nuts that are suitable for the surface of the floor or base frame. Use all bolt holes in the frame
when securing the GT tank.
Precharge pressure
The Flowvess HWG-V tanks are supplied from factory with a pre-charge pressure. See tank
nameplate.
The pre-charge pressure must be adjusted according to the actual application and the installed
pump.
The pre-charge pressure should be slightly below the pump cut-in seing.
Recommended pre-charge pressures:
0.9 x setpoint for fixed-speed pumps
0.7 x setpoint for variable-speed pumps.
Adjustment of pre-charge pressure
If the pre-charge pressure is not suitable for the application, it should be adjusted according to
these recommendations:
1. Use a suitable pressure gauge to check the pre-charge pressure.
2. Release or add nitrogen as required to make the pre-charge pressure equal to the recommended
pre-charge pressure.

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System check
The Flowvess HWG-V tank must be by-passed if the system pressure exceeds the maximum
operating pressure of the Flowvess HWG-V tank during a system check.
Isolating valves
We recommend to install an isolating valve on either side of the Flowvess HWG-V tank.
Maximum operating pressure
The maximum operating pressure of the pump (P2) plus the actual inlet pressure (P1) must not
exceed the maximum operating pressure of the Flowvess HWG-V tank (P3).
See pump and tank nameplates.
Relief valve
Install a relief valve. Set the relief valve to open at the maximum operating pressure. This will protect
the Flowvess HWG-V tank and other system components.
The relief valve should be installed at the connection of the Flowvess HWG-V tank to the pipe
system and have a discharge equal to the pump capacity at maximum operating pressure.
Maintenance
Check the pre-charge pressure annually.
Before checking the pressure, make sure that there is no water in the Flowvess HWG-V tank (switch
o the pump, and open a tap). If water escapes during the pre-charge pressure check, the bladder
is defective. The bladder in Flowvess HWG-V tanks with a volume larger than 80 litres can be
replaced.
Check the Flowvess HWG-V tank for damage:
Is corrosion visible?
Are scratches, dents, etc. visible?
In case of serious damage, contact Flowtech.
Technical data
See tank nameplate.
Disposal
This product or parts of it must be disposed of in an environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact Flowtech.

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contact us
FOR FURTHER INFORMATION OR ASSISTANCE
Flowtech Water Solutions are experts in water services and water booster sets.
We have continuously supplied a wide range of standard and custom products since
being founded in 1996.
TELEPHONE : [phone] TELEPHONE : [phone]
MANUFACTURE & SUPPLY SERVICE & MAINTENANCE
ADDRESS : Unit 1 Lock Flight Buildings, Wheatlea Industrial Estate,
Wigan, Greater Manchester WN3 6XP United Kingdom
EMAIL: [e-mail] EMAIL: [e-mail]
WEBSITE: .flowtech.org.uk
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