KSB Delta Basic MVP User Manual

8 Servicing/Maintenance
31 of 48
KSB Delta Basic
1983.835/01-EN
Maintenance interval Servicing/maintenance work
At least once a year Check the shut-off elements, drain valves and check valves for proper functioning and
tightness.
If fitted, clean the strainer in the pressure reducer.
If fitted, check the expansion joints for any wear.
Verify the pre-charge pressure. Check the accumulator for integrity.
(ðSection8.2.3,Page31)
Check the automatic switching functionality.
Check the cut-in levels and cut-out levels.
Check the inflow, inlet pressure, dry running protection, flow monitoring and pressure
reducer.
8.2.3 Setting the pre-charge pressure
WARNING
Wrong gas
Danger of poisoning!
▷ Use only nitrogen to charge the accumulator.
CAUTION
Pre-charge pressure too high
Damage to the accumulator!
▷ Observe the manufacturer's product literature (see name plate or operating
manual of the accumulator).
The accumulator’s pre-charge pressure (p) must be lower than the set start-up
pressure (p
E
) of the pressure booster system.
The best storage volumes are achieved with the following settings (mean value):
▪ Value 0.9 at start-up pressure > 3bar
▪ Value 0.8 at start-up pressure < 3bar
Example 1 p
E
=5bar
5bar×0.9=4.5bar
With a start-up pressure of 5bar the pre-charge pressure of the accumulator must be
4.5 bar.
Example 2 p
E
=2bar
2bar ×0.8=1.6bar
With a start-up pressure of 2bar the pre-charge pressure of the accumulator must be
1.6 bar.
Checking the pre-charge pressure
1. Close the shut-off elements fitted underneath the membrane-type accumulator.
2. Drain the membrane-type accumulator via the drain valve.
3. Remove and store the protective cap of the membrane-type accumulator valve.
4. Check the pre-charge pressure using suitable equipment (e.g. tyre pressure
gauge).
5. Fit the protective cap of the membrane-type accumulator valve.
Filling the membrane-type accumulator
1. Remove and store the protective cap of the membrane-type accumulator valve.
2. Add nitrogen through the valve.
3. Fit the protective cap of the membrane-type accumulator valve.

KSB Delta Basic MVP Specifications

General

Brand	KSB
Model	Delta Basic MVP
Category	Water Pump
Language	English