11
12.2 Setting the diaphragm tank pre-charge pressure
When the pump cut-in pressure has been determined, the
required pre-charge pressure of the diaphragm tank can be
adjusted roughly to 90 % of the pump cut-in pressure.
Pre-charge pressure = 0.9 x p
cut-in
.
The tank pre-charge has to be checked/adjusted when the
discharge pipe is empty.
13. Maintenance
13.1 Pump
Pump bearings and shaft seals are maintenance-free.
13.2 Settings
To ensure reliable and correct operation, the pre-charge pressure
of the diaphragm tank and the setting of the pressure switches
should be checked regularly and at least once a year.
13.3 Frost protection
If the booster set is not used during periods of frost, the
manifolds, pumps and diaphragm tank should be drained to avoid
damage.
Warning
Before starting work on the pumps, make sure
that the electricity supply has been switched off.
Lock the mains switch with a padlock to ensure
that it cannot be accidentally switched on.
