Testing; Operation - FLOWTECH flowpress WMDA Operation And Maintenance Manual

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Turn on the power supply to the pressurisation unit. Depending on the current system pressure, the unit will
respond in one of the following ways:
If the system pressure is below the low pressure alarm setting, the controller will display a "LOW PRESSURE"
fault and the pumps will not run. To clear this fault, either increase the system pressure using a filling loop, or
enable the system fill option on the pressurisation unit.
If the system pressure is above the high pressure alarm setting, the controller will display a "HIGH PRESSURE"
fault. To clear this fault, use a suitable drain point to remove water from the system until the system pressure
equals the cold fill pressure.
If the system pressure is above the low pressure alarm setting, but below the cold fill setting (by an amount
equal to the differential setting), the pumps will start. Once the system pressure has reached the cold fill
pressure, the pump will stop.
Once the required system pressure has been reached, the controller will display the current system pressure.
The unit is now in normal operation.
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.

Operation

Once commissioned, the pressurisation unit should operate without any user intervention.
Under normal operating conditions, the display will show the current system pressure in Bar.
While the unit is filling, the display will show <PUMP 1 RUN> or <PUMP 2 RUN> depending on which pump is
currently running.
If the unit identifies a fault, the display will show the relevant fault code.
If the pressurisation unit is showing a fault code on the display, holding down the [SET] button will cause the
current system pressure to be temporarily shown on the display.