Nu-Way MDFL 3300 Installation And Maintenance Manual

Nu-Way MDFL 3300 Installation And Maintenance Manual Manual pdf 28 page image

Burner Live Run – MDFL 3300 & MDFL 4000The instructions in this section are presented as a continuous sequence. No separate set of actions(for example, checking the flame signal) should be followed in isolation without paying particularattention to any safety precautions such as isolating the electrical supply to the burner which shouldprecede such actions. At all stages, the operation of the burner should be checked against theprogramming controller sequence table on page 22.Setting Oil Flow Rates and Air/Fuel RatiosFrom this point the oil commissioning process is concerned with setting the high and low fire oil flowrates to appropriate values and ensuring that the combustion quality of the system is withinacceptable limits. During this process:AFTER EACH ADJUSTMENT check the flue gas analysis and oil flow rate.ALWAYS use approved and calibrated test equipment.NEVER rely on visual observation of the flame as the only guide to combustion quality.New MDFL modulating burners are generally supplied against the firing specification of the appliance.In this case the system and spill pressures may be pre-set and require checking and minoradjustments only.The following section describes how to set up the modulating cam box unit from the beginning. Themodulating cam box is shown on page 29.The modulating cam layshaft can be rotated by hand using the gearbox disengagement lever in thedrive servomotor.1. Ensure that the modulating cam arrangement is in the low flame position.Adjust the oil cam (refer to page 29) so that it gives approximately 1.5mm throw (3mm stroke)and lock in position.2. Check to ensure that the spill valve push rod bears slightly against the oil cam (refer to page 29).3. Rotate the air cam adjusting thumbscrews in or out so that they give a reasonable amount ofadjustment in each direction.Adjust the flexible cable (at either end if necessary) until the air inlet damper is fully closed (i.e.until all the slack is taken up on the cable).4. Adjust the thumbscrews to give a small opening of the air damper at the low flame position.5. Reset the sequence control and allow the burner to start. Immediately the burner starts, switchthe Hand/Auto selector switch to the ‘Hand’ position and remain at low flame until the applianceis ready to accept high flame. During this period, check and adjust the low flame oil throughput.6. Observe the flame through the inspection window at the rear of the burner casing to ensure theflame is established around the outer edge of the diffuser plate. A continuous halo should bevisible. If the flame is dirty, adjust the air cam thumbscrews until the flame becomes clean.7. After a suitable delay, inch the cam shaft to the high flame position (i.e. through 180°) by meansof the inching switch on the control panel. Adjust the air cam profile by means of thethumbscrews until the air damper is now fully open.At this stage it will be found that all of the thumbscrews between low and high position willrequire adjusting so as to avoid over-stressing the cam profile band. Once this has been done,there should be a fairly smooth profile between low and high flame positions.8. Ensure that the flame is visually clean throughout the modulation range at all times.MDFL 3300 & MDFL 4000 Issue 2 08/08 Page 27