AUTOFLAME Mk8 MM User Manual

2 Options & Parameters
Mk8 MM Manual Page | 43
Opt. # Default Range Description
46
0
MM: Cold Start Inhibit Time
If the MM progresses from low fire cold start to firing and the burner shuts
down within this cold start inhibit time, a cold start will not occur when the
burner starts up again. This allows the burner to come straight on in
normal firing in situations where the demand has increased drastically and
the actual value drops fast.
0
Disabled
1 – 120
Minutes
47
0
MM: Cold Start Routine
On burner start-up, if the actual value is at 30% or below of the required
setpoint, then the burner will be held at low fire for the number of minutes
set in this option. It will then go to mid-fire. If the actual value is below 60%
of the required setpoint, then the burner will be held at mid-fire for the set
minutes. Once this cold start time has elapsed, or the value goes above
60% of the required setpoint, the burner will go to high fire as per the
internal PID. It is not recommended to use cold start routine with external
modulation or sequencing.
0
Disabled
1 – 2000
Minutes
48
0
MM: Flue Gas Recirculation – Timer
This is the time that the MM channels (servomotors/ VSDs) are held at the
FGR start positions, after which modulation takes place. This timer starts
at the end main flame proving. FGR allows approximately 15% of the
boiler flue gases via an auxiliary channel (e.g. 3) to be fed back to the
burner and mixed with combustion air, to reduce NOx.
0
Disabled
1 – 3600
Seconds
49
0
MM: Flue Gas Recirculation – Offset
This is an offset from the required setpoint. The MM channels
(servomotors/ VSDs) are held at the FGR start positions until the actual
value reaches this offset value below the required setpoint.
0
Disabled
1 – 50
O
C,
O
F, PSI or 0.1 bar or 0.01 bar for low pressure sensor (depends on
load detector set in option 1 and metric/imperial units set in parameter 40)
50
0
MM: Flue Gas Recirculation – Temperature Threshold
The MM channels (servomotors/ VSDs) are held at the FGR start positions
until the flue gas temperature has reached 120
O
C (248
O
F). This option can
only be used if an EGA is optioned and operational.
0
FGR temperature threshold disabled
1
FGR temperature threshold enabled
51
2
MM: Multi-Burner Highest Slave ID
This should be set to the highest slave ID set in option 44 for the MMs in
the multi-burner loop.
2 – 10
Multi-burner slave ID
52
0
MM: Multi-Burner Differential Firing Rate Limit
If the difference between the firing rates of the Master MM and the slave
MMs is equal to or greater that this limit, the Master MM will stop
modulating and wait for the slaves to catch up. When the difference
reduces to less than or equal to 5%, the Master starts modulating again.
0
Disabled
1 – 20
1% - 20%

AUTOFLAME Mk8 MM Specifications

General

Brand	AUTOFLAME
Model	Mk8 MM
Category	Controller
Language	English