7.4 Commissioning with Draft Control
The Autoflame draft control system is commissioned during the burner commissioning process. As with
all M.M. commissioning procedures on burners, safety must be taken in every step. Once the
installation and all burner adjustments are completed, the entire burner control system should be tested
in accordance with the manufacturer’s instructions. The procedure should verify the correct operation
of:
1. Each operating control (temperature, pressure, etc.)
2. Each limit switch (temperature, pressure, low water cut-off, etc.)
3. Each interlock switch (airflow switch, high and low fuel pressure or temperature switches,
purge and low fire switches, fuel valve proof of closure interlock, etc.)
4. Pilot flame failure response and lockout
5. Main flame failure response and lockout
6. Tight shut off of all valves
Operational Checks
1. Close manual main shut-off valve
2. Recheck all limit circuit wiring for proper operation and correct connection
3. Confirm that the automatic main fuel valves are wired correctly
4. Power the control, and electronically check the proper sequence of operation
5. After assuring yourself that all the interlocks and valves are properly wired and that the
sequence of operation is correct, open the manual main shut-off fuel valve and proceed
cautiously through the boiler light off process. Check all safety interlocks for proper shutdown
of the boiler.
The M.M. commissioning procedure is explained in detail ‘Mk7 Manual: M.M. Installation and
Commissioning Guide – Section 3,’ however the added steps for the commissioning with draft control
are as follows.
WARNING: COMMISSIONING OR START-UP MUST ONLY BE
CARRIED OUT BY A FACTORY TRAINED TECHNICIAN
Commissioning Procedure
1. Check all wiring between the M.M. and external components are correct
2. Set all required options, parameters and expansion-setups.
3. Set up servomotors
4. Program fuel/air positions and draft positions
On a previously commissioned system, it is possible to omit steps 1 to 3.
A CH 7 has been added to the commissioning procedure which enables control of the draft control
damper. In addition to the CH 7, a draft pressure is visible on the M.M. screen whilst commissioning.
This is to aid in the commissioning procedure whilst using the draft control.
Use CH7 to change the draft damper angle to maintain the boiler’s ideal stack pressure throughout the
commissioning curve.
Note: If on the day of commission, there are extreme conditions such as heavy wind, the stored angles
for the draft damper along the commissioned curve may not be relevant for a day without heavy wind
over the stack.
To Next Page
Loading...
Need help?
General
