AUTOFLAME Mk8 MM, Technical Manual

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Contents
1 SENSORS ....................................................................................................................................... 1
1.1 Gas Pressure Sensor .......................................................................................................... 1
1.1.1 Mk8 MM Valve Proving Schematics .................................................................................... 4
1.1.2 Mini Mk8 MM Valve Proving Schematics ............................................................................ 9
1.1.3 Calculating Proving Time and Pressure Change .............................................................. 15
1.2 Oil Pressure Sensor .............................................................................................................. 18
1.3 Air Pressure Sensor .............................................................................................................. 20
1.3.1 Air Pressure Proving ......................................................................................................... 23
1.3.2 Air Pressure Tapped Fitting .............................................................................................. 24
1.4 Steam Pressure Sensor ........................................................................................................ 25
1.5 Water Temperature Sensor ................................................................................................... 27
1.6 Outside Temperature Sensor ................................................................................................ 29
1.6.1 Night Setback .................................................................................................................... 34
2 FLAME SAFEGUARD .................................................................................................................. 35
2.1 Burner Control Sequence Diagrams ..................................................................................... 35
2.1.1 Interrupted Pilot – Gas ...................................................................................................... 36
2.1.2 Interrupted Pilot – Oil ........................................................................................................ 37
2.1.3 Intermittent Pilot – Gas with Post VPS .............................................................................. 38
2.2 Flame Scanner Types ........................................................................................................... 39
2.2.1 IR End View Scanner ........................................................................................................ 39
2.2.2 Self-Check End View UV Scanner – High Sensitivity ....................................................... 41
2.2.3 Self-Check Side View UV Scanner – High Sensitivity ...................................................... 43
2.2.4 Mk8 Series Side View UV Scanner ................................................................................... 45
2.2.4 Standard European Side Viewing UV Scanner ................................................................. 46
2.2.6 Standard North American UV Scanner – End Viewing ..................................................... 48
2.2.7 Standard North American UV Scanner – End Viewing High Sensitivity ........................... 50
2.2.8 Swivel Mount Assembly .................................................................................................... 51
2.3 Selection Of UV Scanner Types ........................................................................................... 52
2.3.1 UV Installation ................................................................................................................... 53
2.3.2 UV Self Adaptive Pulse Width Modulation ........................................................................ 54
2.3.3 Dual Flame Scanner Operation ......................................................................................... 55
2.4 Mk8 MM Flame Detection Using An External Flame Switch ................................................ 56
2.5 Mini Mk8 MM Flame Detection Using Ionisation ................................................................... 56
2.6 No Pre-Purge ........................................................................................................................ 57
2.7 Continuous Pilot .................................................................................................................... 58
2.7.1 Continuous Pilot with Interrupted Pilot Sequence ............................................................. 59
2.7.2 Continuous Pilot with Intermittent Pilot Sequence ............................................................ 60
2.8 Mini Mk8 MM Single Servomotor .......................................................................................... 61