Boss AX1-2.5E, Operation & Maintenance Manual

Page: 32 / 44

32
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.
Check Strainer (AX & PF units only)
AX and PF pressurisation units are fitted with a mesh strainer in the connection at the bottom of the
break tank. This should be removed and inspected. Depending on the condition, this part may need
to be cleaned or replaced.
Check Expansion Vessel Pre-Charge
Many of the problems experienced with pressurisation equipment can be traced back to the
expansion vessel.
The expansion vessel pre-charge pressure must be checked after 2 years and annually thereafter.
To perform this test, the expansion vessel must first be drained of water, then a gauge can be
connected to the Schrader valve on the vessel to measure the pre-charge pressure. The pre-charge
should be equal to the [COLD FILL] pressure setting.
The pressure can be increased using a foot pump, air compressor or pressurised air/nitrogen
cylinder.
If any faults are identified during these checks, please refer to the Troubleshooting
section of this manual. If replacement parts are required, please refer to the Spares
section for part codes.