ML548_ES | v3
i
®
Control Unit Data ..................................................................................................................................2
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
EPPS (Electro-Pnuematic Power Supply)............................................................................................................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..............................................................................................................................................10
CLAPS Sensor..............................................................................................................................................................10
CLAPS Regulator........................................................................................................................................................10
Relief Valve Unit........................................................................................................................................................10
/PA Terminal Box.......................................................................................................................................................10
Thermostat and Heater ..........................................................................................................................................10
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
Commissioning the System ...................................................................................................................................14
Normal Operation ......................................................................................................................................................15
General maintenance...............................................................................................................................................16
Additional maintenance checks...........................................................................................................................16
Re-calibration of the Relief Valve Unit ............................................................................................................16
Re-calibration of the Pressure Sensors............................................................................................................17
General Information .................................................................................................................................................18
System purges correctly but trips and auto re-purges at the end of the purge time...................18
Relief Valve opens (continuously or intermittently) ..................................................................................19
System enters purging but purge indication does not occur ..................................................................19
System begins purging but cycles fail to complete ....................................................................................19
