Visual Inspection; Interrogate Controller; Test Unit Operation; Check Float Valve Operation - FLOWTECH flowpress WMDA Operation And Maintenance Manual

Visual Inspection

A basic visual inspection will highlight the majority of potential faults on a pressurisation unit. It is
recommended to perform a visual inspection annually. However, due to the simplicity of performing these
checks, frequent inspections are encouraged.
• Check the digital display for fault codes
• Check for signs of leakage (e.g. water, mineral deposits, corroded components/cabinet)
• Check the break tank overflow for signs of water discharge
• Check flexible hoses for signs of degradation (e.g. cracks)
• Check that the pressure reading on the digital display corresponds to the actual system pressure
(read off another gauge)

Interrogate Controller

The digital controller keeps a log of the number of pump starts and total hours run for each pump, as well as
the number of alarm activations and power interruptions. It is advisable to take a note of these figures when
servicing the unit, as they may be helpful in diagnosing potential issues. Fields are provided in the service log
for these figures.
It is advisable to scroll through all the settings (including engineers setting) and check them against the
figures on the commissioning report. If there are any discrepancies, check first with on-site staff to see if the
changes are deliberate. If not, reconfigure appropriately.
If settings are persistently becoming corrupted, a power filter may be required. Please refer to the Installation
section of this manual for more information.

Test Unit Operation

The best way to test the operation of the pressurisation unit is to drain water from the system, allowing
the pressure to drop slowly. Once the pressure falls below the pump cut-in pressure ([COLD FILL] –
[DIFFERENTIAL]) the pump should start. As soon as the pump starts, close the drain point and allow the
system pressure to rise.
Once the [COLD FILL] pressure is reached, the pump should stop.
If the unit is a twin pump model, this test should be repeated until both pumps have run and successfully re-
pressurised the system.

Check Float Valve Operation

To test the operation of the break tank float valve, first ensure that the break tank overflow has a suitable path
to drain.
Gently push down on the arm of the float valve until it starts to discharge water, then release the float valve
arm. Once the arm has been released, the flow of water should stop within a few seconds.

Check Float Switch Operation

To test the operation of the break tank low level float switch, reach into the break tank and gently push the
float switch down into the horizontal position.
The digital controller should now display a <LOW H20> fault.
Release the float switch and observe the display. The fault should clear after a delay of a few seconds.

Check Break Tank Water Condition

Perform a visual check of the water in the break tank. If there is any dirt or debris in the water, or deposits on
the sides of the tank, the tank should be drained down and cleaned.
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