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Pressures in a sealed system
Below is an overview of how the settings on a pressurisation unit must be considered for normal operation.
Close, conflicting or overlapping settings will cause system instability and nuisance alarm conditions. If in any
doubt please seek advice from a Sealed System professional.
A typical venting allowance is 0.3 bar, added to the static height to give the cold fill pressure.
The Differential setting represents the allowable pressure loss before the pump activates and restores the cold
fill pressure. The Differential setting must not be greater than the system venting allowance. This will ensure
that the system remains fully flooded during normal topup conditions.
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