Grundfos GT-U Instrucciones De Instalación Y Funcionamiento página 8

4.5 Isolating valves
We recommend to install an isolating valve on either
side of the GT tank.
Side view
Fig. 7 Isolating valves
4.6 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 GT
tank (P3). See fig. 8.
See pump and tank nameplates.
P2
P1
Fig. 8 Maximum operating pressure
4.7 Relief valve
Install a relief valve. Set the relief valve to open at
the maximum operating pressure. This will protect
the GT tank and other system components.
The relief valve should be installed at the connection
of the GT tank to the pipe system and have a
discharge equal to the pump capacity at maximum
operating pressure.
Side view
Fig. 9 Relief valve
8
Top view
P3
Relief valve
5. Maintenance
Check the precharge pressure annually.
Before checking the pressure, make sure that there
is no water in the GT tank (switch off the pump, and
open a tap). If water escapes during the precharge
pressure check, the bladder is defective.
The bladder in GT tanks with a volume larger than
80 litres can be replaced.
Check the GT tank for damage:
• Is corrosion visible?
• Are scratches, dents, etc. visible?
In case of serious damage, contact your nearest
Grundfos company.
6. Technical data
See tank nameplate.
7. 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 the nearest
Grundfos company or service workshop.
Subject to alterations.