EXPO D760-ET MiniPurge, Manual

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ML548 | v11 i
Section 1: System Specification ................................................................................................. 1
MiniPurge
®
Control Unit Data ..................................................................................................................................2
Relief Valve Unit and Purge Outlet Valve with integral spark arrestor.................................................3
Section 2: Quick User Guide ........................................................................................................ 4
Installation ......................................................................................................................................................................4
Operation of the System ...........................................................................................................................................4
Section 3: Application Suitability ............................................................................................... 5
Section 4: Description and Principle of Operation ................................................................... 6
Section 5: Main Components....................................................................................................... 7
Air Supply Filter / Regulator ....................................................................................................................................7
Logic Air Supply Regulator .......................................................................................................................................7
Minimum Pressure Sensor ........................................................................................................................................7
Purge Flow Sensor.......................................................................................................................................................7
Intermediate Sensor....................................................................................................................................................7
High Pressure Sensor .................................................................................................................................................8
Electronic Purge Timer...............................................................................................................................................8
Purge Complete Valve................................................................................................................................................8
OR Gate.............................................................................................................................................................................8
Alarm Only Circuit (/AO) .............................................................................................................................................8
Visual Indicators ...........................................................................................................................................................9
Power Interlock Switch ..............................................................................................................................................9
Alarm / Pressurized Switch.......................................................................................................................................9
System Purging Switch (Optional).........................................................................................................................9
Intermediate Switch....................................................................................................................................................9
High Pressure Switch (Optional) ............................................................................................................................9
Purge Valve ....................................................................................................................................................................9
Purge Flow Regulator.................................................................................................................................................9
CLAPS Sensor..............................................................................................................................................................10
CLAPS Regulator........................................................................................................................................................10
Relief Valve Unit........................................................................................................................................................10
/PA Terminal Box.......................................................................................................................................................10
Thermostat and Heater ..........................................................................................................................................10
Section 6: Installation of the System ......................................................................................11
Relief Valve Unit........................................................................................................................................................11
Air Supply Quality......................................................................................................................................................11
Pipe Work......................................................................................................................................................................12
Multiple Enclosures...................................................................................................................................................12
Provision and Installation of Alarm Devices...................................................................................................12
Power Supplies and their Isolation ....................................................................................................................12
Power Interlock Switch ...........................................................................................................................................12
Section 7: Commissioning .........................................................................................................13
Commissioning the System ...................................................................................................................................13
Normal Operation ......................................................................................................................................................15
Section 8: Maintenance of the System....................................................................................15
General maintenance...............................................................................................................................................15
Additional maintenance checks...........................................................................................................................15
Maintenance of Electronic Timer ........................................................................................................................15
Re-calibration of the Relief Valve Unit ............................................................................................................15
Re-calibration of the Pressure Sensors............................................................................................................16
Section 9: Fault Finding.............................................................................................................17
General Information .................................................................................................................................................17
System purges correctly but trips and auto re-purges at the end of the purge time...................17
Relief Valve opens (continuously or intermittently) ..................................................................................18
System enters purging but purge indication does not occur ..................................................................18
System begins purging but cycles fail to complete ....................................................................................18
Section 10: Recommended Spares List....................................................................................19