Wilo Isar BOOST5 - Diaphragm Expansion Tank Filling

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16 Installation and operating instructions • Isar BOOST5 • Ed.06/2024-05
1. Press operating button “+”.
▶ Operating pressure is displayed (2bar).
1. Increase the operating pressure to 3bar by pressing the
operating button “+” twice (0.5bar + 0.5bar).
▶ The “operating status” LEDs indicate the current oper-
ating pressure (3bar).
6.5 Filling the diaphragm expansion
tank
Fig.14: Filling the diaphragm expansion tank
CAUTION
Premature damage to the product due to incorrect installation!
The integrated diaphragm expansion tank is prefilled ex works to a pres-
sure of 1.5bar. The maximum filling pressure is 4bar.
• Fill the diaphragm expansion tank at a system pressure of zero.
• Fill the diaphragm expansion tank according to the table.
• After each change of operating pressure, the filling pressure of the dia-
phragm expansion tank must be adjusted.
Desired operating pressure (bar) Filling pressure (bar) of diaphragm expan-
sion tank
1.0 0.5
1.5 1.0
2.0 1.0
2.5 1.5
3.0 1.5
3.5 2.0
4.0 2.5
4.5 3.0
5.0 3.5
5.5 4.0
✓ Compressor or pump with manometer at hand.
1. Close the gate valve (Fig. 7 – Item 1, 2) at the suction and discharge sides.
2. Remove the screw at the diaphragm expansion tank closure.
3. Connect the compressor or air pump (hand pump) to the closure of the diaphragm ex-
pansion tank.
4. Fill the diaphragm expansion tank until the desired and set operating pressure is
reached.
NOTICE
If necessary, install an additional diaphragm expansion tank on the dis-
charge side to avoid pressure peaks.