1 Mk8 MM Overview, Specifications and Wiring
Mk8 MM Manual Page | 14
1.1.1 Mk8 MM Main Features
• Fuel/Air ratio control
• 12.1” Full colour touch screen
• 120V or 230V standard operation 50/60Hz
• Controls up to 5 servomotors and 2 variable speed drives (VSD/ VFD)
• 4 independent fuel programmes
• Fully adjustable PID load control for temperature or pressure
• Internal flame safeguard – full flame supervision with self-check UV or IR
• Dual flame scanner operation (IR and UV scanners)
• Gas valve train leak supervision and high/low gas pressure monitoring
• Air pressure proving and monitoring
• 128 lockouts, errors, alarms and warnings stored with date, time, phase and reset
• 1000 entry system log stored with date, time and status
• Online diagnostics showing system electronics information
• Single point change for adding, removing and adjusting fuel/air positions on fuel-air curve
• Golden start position for optimum ignition position
• Flue gas recirculation start position
• Variable servomotor travel speed
• Burner control safety times user selectable
• External voltage/current load control and setpoint adjustment
• Outside temperature compensation of boiler setpoint
• Second setpoint and run times scheduling
• Hand/auto/low flame hold firing modes
• Various boiler load detectors available
• Fuel flow metering capability – instantaneous and totalised
• Fuel flow feedback
• Multi-burner capability with synchronised firing rate up to 10 MMs
• 4-20mA (0-20mA) / 0-10V (2-10V) input for external modulation
• 4-20mA (0-20mA) / 0-10V (2-10V) output confirming firing rate
• Fully metered combustion control for commissioning based on equivalence ratio and excess air
• Draft control to maintain stack pressure
• Password protection of all safety related functions
• Infra-red port for upload/download of commission data
• 15 First out annunciation inputs
• 4 fuel commission curves possible
• 24-hour history graphical information on MM when powered on
• Custom boiler display configuration
• Download / upload all commissioning data and controller settings from MM module to a PC via
Bluetooth or IR
• System will sequence hot water boilers or steam boilers via lead/lag distribution
• Fully adjustable user options within the system to tailor sequencing operation to the application
• System control for isolation of valves or pumps (2 port valve operation)
• Standby setpoint and warming for lag boilers via a standby pressure and timing sequence
• Lead boiler and lag boiler warming modes selection
• Return to pilot allows the main flame to turn off and the pilot flame can continue
• Fully modulating feed water control with servomotor and VSD as well pump on/off
• Capacitance probes for patented wave signature level detection
• Water level alarms 2
nd
low, 1
st
low, high water and optional pre 1
st
low and pre-high water
• Conductivity probe for auxiliary 2
nd
low alarm
• Automatic bottom blowdown with time reduction for blowdown savings
• Continuous modulating top blowdown control to maintain TDS level in water
• Steam/ hot water flow metering to calculate flow rates based on temperature sensor
• Direct Modbus communications from MM including remote setpoint and firing rate adjustment, burner
enable/disable (without DTI or intelligent boiler sequencing)
• Fuel Changeover on the Fly (COF) which allows fuel change without turning off the burner
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