8. Check the water inflow, inlet pressure, lack-of-water monitoring, flow
monitoring and pressure reducer.
9. Check the inlet tank and the float valve (if applicable). Check the overflow for
integrity and cleanliness.
9.2.3 Setting the pre-charge pressure
WARNING
Wrong gas
Danger of poisoning!
▷
Use only nitrogen to charge the accumulator.
The pre-charge pressure in the accumulator should be set to a value below the set
start-up pressure.
The setting can be effected via a valve located under the cover at the top of the
accumulator.
Example: Pre-charge pressure 10 % lower than start-up pressure
Pre-charge pressure of accumulator p = 0.9 x p
start
p
start
= start-up pressure of pressure booster system
Recommendation
The stated values are average values. Tests on accumulators have shown that the best
storage volumes are achieved with the following factors:
pressures >3 bar: factor 0.9 and
pressures <3 bar: factor 0.8
Example:
p
start
= 5 bar: pre-charge pressure 5 x 0.9 = 4.5 bar
p
start
= 2 bar: pre-charge pressure 2 x 0.8 = 1.6 bar
CAUTION
Pre-charge pressure too high
Damage to accumulator!
▷
Observe data provided by accumulator manufacturer (see name plate or
operating manual of accumulator).
9 Servicing/Maintenance
Hya®-Solo DV
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