ML434_ES | v11
i
®
Control Unit Data ..................................................................................................................................2
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
Electronic Purge Timer...............................................................................................................................................7
EPPS (Electro-Pnuematic Power Supply)............................................................................................................8
Purge Complete Valve................................................................................................................................................8
OR Gate.............................................................................................................................................................................8
Alarm Only Circuit (/AO) .............................................................................................................................................8
Visual Indicators ...........................................................................................................................................................8
Power Interlock Switch ..............................................................................................................................................8
Alarm / Pressurized Switch.......................................................................................................................................9
System Purging Switch (Optional).........................................................................................................................9
Intermediate Switch....................................................................................................................................................9
Purge Valve ....................................................................................................................................................................9
Purge Flow Restrictor.................................................................................................................................................9
CLAPS Sensor.................................................................................................................................................................9
CLAPS Regulator...........................................................................................................................................................9
Relief Valve Unit...........................................................................................................................................................9
/PA Terminal Box.......................................................................................................................................................10
Relief Valve Unit........................................................................................................................................................10
Air Supply Quality......................................................................................................................................................10
Pipe Work......................................................................................................................................................................11
Multiple Enclosures...................................................................................................................................................11
Provision and Installation of Alarm Devices...................................................................................................11
Power Supplies and their Isolation ....................................................................................................................11
Power Interlock Switch ...........................................................................................................................................11
General maintenance...............................................................................................................................................15
Additional maintenance checks...........................................................................................................................15
Re-calibration of the Relief Valve Unit ............................................................................................................15
Re-calibration of the Pressure Sensors............................................................................................................16
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
Section 11: Glossary ..................................................................................................................19
Section 12: Drawings and Diagrams ........................................................................................19
Section 13: Certifications ..........................................................................................................20
