6
Multi-Burner Operation – Mk8 MM
Page | 91
MM Application Possibilities
6.5
Multi-Burner External Modulation
Multi-Burner can be used with both permanent external modulation and switched external modulation.
Only the Master MM needs to be wired for external modulation, please see the Mk8 MM Installation
and Commissioning Guide for full details.
6.5.1 Permanent External Modulation
With option 45 set to 1 or 2 and option 55 set to 0 for permanent external modulation the following
occurs when there is an error/lockout:
Option 43 = 1
If either the Master or Slave MM has a lockout, then both MMs will go into standby. Once the fault
condition has been cleared, both MMs will start up in sync.
Option 43 =2
If the Master MM has a lockout, then the Slave MM will continue to fire at low flame hold. Once the
lockout is reset, the Master MM will go through its start-up sequence and the MMs will sync once it
has reached firing; they will continue to fire as per the external modulation signal.
If the Slave MM has an error/lockout, then the Master MM will continue to fire on its own, following the
external modulation to reach the setpoint.
6.5.2 Switched External Modulation
With option 45 set to 0, and option 55 set to 1 for switched external modulation, a line voltage on
terminal 88 switches the MM from internal PID to external modulation. Switched modulation cannot be
used with sequencing.
The following occurs when there is a lockout:
Option 43 = 1
When the terminal 88 input is switched on, all MMs change to external modulation. If either the Master
or a Slave MM has a lockout with either external modulation switched on or off, all MMs will go into
standby. Once the fault has cleared, they will start up and fire in sync.
Option 43 = 2
With the switched external modulation input turned off on terminal 88, so that all MMs are using the
internal PID, if the Master or a Slave has a lockout, then the other will continue to fire following the
internal PID. Once the fault has cleared, they will fire simultaneously with internal PID.
If the MMs are switched on for external modulation and the Master MM has a lockout, then the slave
MM will go to internal PID and continue to fire. Once the lockout has been reset, the Master MM will
go through the start-up sequence and synchronise with the Slave MM once it has reached firing
status, they will continue to fire following the external modulation.
If the MMs are switched on for external modulation and a Slave MM has a lockout, the Master MM will
continue to fire with external modulation. Once the fault has been reset, they will sync when the Slave
MM reaches firing status, and continue with external modulation.
Summary of Contents for Mk8 MM
Page 1: ...Combustion Management Systems MM APPLICATION POSSIBILITIES Technical Manual 18 12 2019...
Page 8: ...1 Sensors Page 2 MM Application Possibilities Gas Pressure Sensor...
Page 27: ...1 Sensors Page 21 MM Application Possibilities Air Pressure Sensor...
Page 32: ...1 Sensors Page 26 MM Application Possibilities Steam Pressure Sensor...
Page 36: ...1 Sensors Page 30 MM Application Possibilities Outside Temperature Sensor...
Page 37: ...1 Sensors Page 31 MM Application Possibilities Outside Temperature Module...
Page 38: ...1 Sensors Page 32 MM Application Possibilities Outside Temperature Module Wiring...
Page 42: ...2 Flame Safeguard Page 36 MM Application Possibilities 2 1 1 Interrupted Pilot Gas...
Page 43: ...2 Flame Safeguard Page 37 MM Application Possibilities 2 1 2 Interrupted Pilot Oil...
Page 46: ...2 Flame Safeguard Page 40 MM Application Possibilities IR End View Scanner...
Page 72: ...2 Flame Safeguard Page 66 MM Application Possibilities 2 9 3 Wiring...
Page 81: ...5 Intelligent Boiler Sequencing Page 75 MM Application Possibilities 5 1 3 Hot Water Example...
Page 83: ...5 Intelligent Boiler Sequencing Page 77 MM Application Possibilities 5 1 5 IBS Communications...
