13 Draught Control
Mk8 MM Manual Page | 250
13.5 Commissioning Draught Control
13.5.1 Commissioning Checks
Important Note: Prior to commissioning, the fuel and air servomotors must be calibrated to ensure that the
position of the valves and damper correspond to the potentiometer feedback signal as displayed on the MM.
When the valve is fully closed, the MM should display zero degrees. If it does not, please adjust the
servomotor potentiometer.
If the MM is commissioned without an EGA then a combustion analyser is required to check the exhaust
gases. If the system does have an EGA, then a combustion analyser is not necessary as the EGA performs
all normal exhaust gas measurements. When burning oil, a smoke detection device is also necessary to
check that the smoke generated is within safe limits.
To implement commissioning efficiently, arrange for a substantial load on the boiler. The commissioning
procedure can be interrupted due to excess temperature or pressure, causing the burner to turn off; the
commissioning data entered so far is not lost, provided power is not lost to the MM. When the burner is
called back on, the system starts automatically, and commissioning can proceed from where it was left.
Once a start position has been entered, the high fire position is entered next, then descending fuel/air
positions are entered consecutively until finally the low fire position is entered. CH1 and CH2 positions must
always be less than the ones previously entered; however, CH3 to CH7 can be set lower or higher than the
previous position. CH7 is used for the draught servomotor (unlockable expansion feature).
CH1 Fuel valve
CH2 Air damper
CH3 Auxiliary Servomotor
CH4 Auxiliary Servomotor
CH5 VSD 1
CH6 VSD 2
CH7 Draught servomotor (unlockable expansion feature)
On a newly installed system the following procedures should be carried out as listed:
1. Check all interconnecting wiring between the MM and external components is correct.
2. Set options, parameters and expansion options required.
3. Commission bottom blowdown module if optioned.
4. Commission water level probes and external level sensor if optioned.
5. Set up servomotors.
6. Program fuel/air positions.
On a previously commissioned system is it possible to omit steps 1 to 5.
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