Maintenance; Maintenance Schedule; Checking The Gt Tank For Damage; Fault Finding - Grundfos GT-C Installation And Operating Instructions Manual

Isolating valves
4.3.4 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 figure Maximum operating pressure.
See pump and tank nameplates.
p2
p1
Maximum operating pressure
4.3.5 Relief valve
Install a relief valve. Set the relief valve to open at or
below the maximum operating pressure of the GT
tank. 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.
Relief valve

5. Maintenance

The GT tank is maintenance-free, but we recommend
checking the tank for damage two times a year.
If the tank is removed, when the tank
and/or the system is still pressurized,
make sure that the tank is without
pressure.
Close the isolating valves and remove the
precharge pressure through the air valve.
p3

5.1 Maintenance schedule

• 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 whether the bladder is defective.

5.2 Checking the GT tank for damage

During maintenance, check the following:
1. Is corrosion visible?
2. Are scratches, dents, etc., visible?
In case of serious damage, contact your nearest
Grundfos company.

6. Fault finding

Fault Cause
Frequent
starts/stops.
a) Incorrect
precharge pressure.
b) Diaphragm
broken. Water
escapes if the air
valve is pushed
down.

7. Technical data

See tank nameplate.

8. Disposing of the product

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.
The crossed-out wheelie bin symbol
on a product means that it must be
disposed of separately from household
waste. When a product marked with
this symbol reaches its end of life, take
it to a collection point designated by
the local waste disposal authorities.
The separate collection and recycling
of such products will help protect the
environment and human health.
Remedy
Adjust the
pressure
according to
section
Precharge
pressure.
Replace the GT
tank.
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