System Connection; Fine-Tuning Procedure; Replacing Plain Steel Tanks With Gt; Installation Examples - Grundfos GT series Montage- Und Betriebsanleitung

2.4 System connection

1. Locate the GT in final desired location.
2. Level as necessary.
3. Connect to pump supply line with a short pipe
and eliminate unnecessary friction loss.
4. All piping should be in accordance with prevailing
local codes and standards.

2.5 Fine-tuning procedure

The actual pressure switch settings will often vary
from the standard pressure range indicated. These
variations could cause a momentary lag of water
delivery as the pressure switch is not "tuned" to the
precharge pressure of the GT.
To "fine-tune", proceed as follows:
1. Fill the system and GT until the pump cuts out.
2. Open one or more taps to drain the GT.
3. If there is a momentary pause in the water flow
before the pump starts, adjust pump switch cut-in
setting slightly upward, fig. 8.
See adjustment instructions by switch manufac-
turer.
4. Close taps and refill the GT until the pump cuts
out.
5. Open taps and see if pause is eliminated. If not,
continue adjusting pressure switch until there is
no pause in water flow before the pump cuts in.
Pump cut-in
setting
Pump cut-in
setting
Pump pressure
Fig. 8

2.6 Replacing plain steel tanks with GT

Grundfos recommends that defective plain steel
tanks are replaced with GT tanks.
It is a simple procedure and the line drawing, page
51, should be followed for correct connection to the
system.
It is recommended that a relief valve be installed at
the GT connection.
Also be sure to plug the air port on a jet pump, as air
is no longer required to be supplied to the tank.

2.7 Installation examples

See page 51.
8

3. 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.
Differential
adjusting nut
Subject to alterations.