Grundfos Gt-d, Gt-h, Gt-df, Gt-c, Gt-cf User Manual
GRUNDFOS INSTRUCTIONS
GT-C, GT-CF, GT-D, GT-DF, GT-H
Installation and operating instructions
English (GB) Installation and operating instructions
Caution
Note
English (GB)
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
2. General description
2.1 Applications
3. Nameplate
4. Installation
4.1 Lifting the tank
4.2 Location
4.3 Precharge pressure
4.4 System check
4.5 Isolating valves
4.6 Maximum operating pressure
4.7 Relief valve
5. Maintenance
6. Technical data
7. Fault finding
8. Disposal
Warning
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local
regulations and accepted codes of good
practice.
1. Symbols used in this document
Warning
If these safety instructions are not
observed, it may result in personal injury.
If these safety instructions are not
observed, it may result in malfunction or
damage to the equipment.
Notes or instructions that make the job
easier and ensure safe operation.
2. General description
The Grundfos GT-H, GT-C, GT-D, GT-DF and GT-CF
are suitable for stabilising the pressure in domestic
as well as industrial applications.
2
2
2
3
3
3
3
4
5
5
5
5
5
2.1 Applications
5
• GT-H is a diaphragm tank for use in cold-water
6
6
• GT-C is a composite tank for a wide range of
• GT-CF is a composite tank with FlowThru
• GT-D is a chlorine-resistant double-diaphragm
• GT-DF is a double-diaphragm tank with FlowThru
The table below shows the tank types in relation to
application.
Application
Drinking water ●●●●●
Grey wastewater* ●●- ● -
Seawater ● ----
● Recommended.
- Not recommended.
* Grey wastewater is domestic wastewater, for
Fig. 1 Example of GT-H tank
systems. The horizontal version has a base plate
for mounting of a pump.
applications.
technology for use in cold-water systems.
tank.
technology.
Tan k ty p e
GT-CGT-HGT-CFGT-DGT-
example from dishwashers, washing machines
and cabinet showers.
DF
TM05 1645 3411
2
3. Nameplate
Precharge Instructions:
1. Turn the power and water supply off, then turn on a tap to drain the tank before
adjusting precharge.
2. For a pressure switch controlled pump with a differential set up to 30 psi (2.0 bar),
the precharge should be set to 2 psi (0.2 bar) below the cut-in pressure.
3. For a pump controlled by a pressure switch with a pressure differential
greater than 30 psi (2.0 bar), electronic controls or variable speed controls,
the tank precharge should be set to 65% of cut-out or max system pressure.
4. For pressure tanks installed on main pressure, the tank precharge should be set
equal to the main pressure.
5. For hot water expansion applications, the tank precharge should be set equal to
the system ¿ ll pressure or the main pressure.
Serial Number
Global Water Solutions Ltd. Production Site: TankPAC Industries
L60LH-14-1
Factory Precharge:
Test Pressure:
Max. Temperature: TS
Connection:
Nominal Volume:
Prod. Year/Week:
Part Number:
Type:
Max. Working Pressure: PS
Con¿ g:
Model Number:
Made in Taiwan
Water Mark
ATS5200.485
AGA 60044
COLD WATER
APPLICATIONS
1
2
3
4
5
6
7
17
16
15
14
13
12
11
10
9
8
Fig. 2 Example of nameplate
Pos. Description
1 Product number
2 Model number
3 Max. working pressure
4 Factory-set precharge pressure
5 Total tank volume
6 Production code (year and week)
7 Serial number
8 Marking
9 Manufacturer
10 Notified body
11 Adjustment of precharge pressure
12 Production site
13 Max. working temperature
14 Thread connection
15 Test pressure
16 Configuration code
17 Type designation
4. Installation
Before installation, check the following:
• Do the specifications of the GT 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 GT
tank? See tank nameplate.
4.1 Lifting the tank
The top of large tanks has a welded-on flange/nut in
which a lifting eye can be fitted. When the tank is in
place and secured to the floor, the lifting eye can be
removed.
4.2 Location
Always install the GT tank in the discharge pipe as
close to the pump as possible.
Install the GT tank in a frost-free room. It must be
possible to inspect the GT tank from all sides.
The air-filling valve, water shut-off and discharge
must be accessible, and the nameplate must be
visible.
Install the GT tank so that it is not stressed by the
pipework. If vibrations are likely to occur, we
TM05 5792 4012
recommend that the GT tank is installed so that
vibrations are absorbed.
We recommend to follow these steps:
1. Lift and position the GT tank.
2. Level as required (horizontally and vertically).
3. Secure the GT tank.
4. Connect the pipes and fittings.
5. Check/adjust the precharge pressure.
6. Start the pump or application.
No additional loads from the piping system or
equipment are allowed.
English (GB)
3
Floor installation
Tank
Bracket
Caution
0.9 x setpoint
Setpoint
0.7 x setpoint
Setpoint
Fixed speed
Variable speed
English (GB)
Large GT 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 base frame when securing
the GT tank.
Tanks with steel bases should be mounted using the
brackets supplied, while tanks with plastic bases
should be mounted through the bolt holes in the
base. For bases without bolt holes, drill four holes at
equal distance in the rim of the base.
Fig. 3 Installation of tank with steel base
Fig. 4 Installation of tank with plastic base
Wall installation
Small GT tanks up to 33 litres must be secured to a
wall or similar.
4.3 Precharge pressure
The GT tanks are supplied from factory with a
precharge pressure. See tank nameplate.
The precharge pressure must be adjusted according
to the actual application and the installed pump.
It should be slightly below the pump cut-in setting.
Recommended precharge pressures:
• 0.9 x setpoint for fixed-speed pumps
• 0.7 x setpoint for variable-speed pumps.
TM05 5778 3912TM05 5777 3912TM05 57813912
Fig. 6 Precharge pressure
4.3.1 Adjusting the precharge pressure
Warning
Before starting work on the product, make
sure there is no system pressure on the
tank.
Disconnect pumps or switch off the power
supply.
If the precharge pressure is not suitable for the
application, adjust it as follows:
1. Switch off the pump. Open the nearest tap to
make sure that no system pressure is affecting
the reading.
2. Remove the protective cap.
3. Check the precharge pressure with a suitable
pressure gauge.
4. Release or add air as required to make the
precharge pressure equal to the recommended
precharge pressure.
5. Fit the protective cap to prevent air from
escaping from the tank.
Never exceed the maximum operating
pressure of the tank.
TM05 1654 3411
Fig. 5 Example of wall installation with wall
4
bracket
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