Jet MAXI D125 Operation & Maintenance Manual page 24

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.
We reserve the right to change designs and technical specifications of our products
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Rev 8.1 Oct-15 Page 24 / 42