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Rev 8.1 Aug-15 Page
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4 – Testing
To test the operation of the pressurisation unit while connected to the system, the system pressure must be
lowered slowly to simulate a minor leak.
This can be achieved by using a drain point on the system, the drain point on the pressurisation unit, or by
manually opening the safety relief valve.
Care must be taken not to let the pressure drop too quickly. If the system pressure falls below the
low pressure set point, a low pressure fault will be displayed and the pumps will not run. The
pressurisation unit is not designed to cope with a sudden loss of system pressure, which would be
symptomatic of a catastrophic failure such as a burst pipe.
Once the system pressure has fallen below the cold fill setting (by an amount equal to the differential setting),
the pump should start refilling the system. The pump will continue to run until the cold fill pressure has been
reached.
This test demonstrates the primary function of the pressurisation unit. This test may be repeated at any time to
confirm the operation of the pressurisation unit.
Quick guideline in using expansion vessel
Type of unit
Vessel size (Litres)
Flexfiller
4 x 1000
Midi
600
Mini
200
All Flamco vessel are set at the pre-charge (Factory set) in order for the vessel to work properly with the
pressurisation unit the cold fill pressure needs to be same. Remember to check vessel pressure before
commissioning
Vessel Type
Size Range
Pre-charge (Bar)
Flexcon 6 bar
2 - 25
0.5
35 - 1000
1.5
Flexcon 10 bar
110 - 1000
1.5
Airfix P 10 Bar
2 - 1000
2.7
Airfix P 10 Bar
500 - 5000
3.5
Airfix DE 10 Bar
50 - 3000
5
Airfix DE 16 Bar
50 - 3000
5
Airfix DEB 10 Bar
50 - 3000
5
Airfix DEB 16 Bar
50 - 3000
5
Airfix DEL 10 Bar
50 - 600
5