Jet MAXI D125 Operation & Maintenance Manual page 23

3 – Initial Start-up
Open the internal isolation valve within the pressurisation unit by following the steps below:
Once the isolation valve is open, the pressure sensor will be able to read the system pressure.
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.
We reserve the right to change designs and technical specifications of our products
MAXI & MD Units
Mini Units
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Rev 8.1 Oct-15 Page 23 / 42