Nu-Way MDFL 3300, Installation And Maintenance Manual

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FINAL COMMISSIONING STAGE – OIL AND GAS
Checking the Flame Signal
1. Remove the control panel cover and disconnect the flame signal check link.
2. Connect a DC micro-ammeter across the terminals.
3. Establish the electrical supply to the burner and switch on the burner. Allow the burner to light
and operate normally.
4. Observe the reading on the ammeter at all firing levels including start gas. A steady reading in
excess of 7 microamps is satisfactory. Lower readings may cause intermittent burner lockout
and indicate a need for adjustment of the burner settings – refer to the Section of Fault Finding.
5. Switch off the burner and the electrical power supply to the burner. Disconnect the ammeter
and replace the flame signal check link. Replace the control panel cover.
Setting the Air Pressure Switch
1. Remove the air pressure switch cover.
2. Fit a manometer or other approved pressure measuring instrument to the pressure switch to
enable a comparison to be made between the pressure switch indicator and the measured
pressure, if required.
3. Remove the control panel cover and remove the low fire hold link. Replace the cover.
4. Establish the electrical supply to the burner and switch on the burner. Allow the burner to
proceed through its sequence until it is operating on low fire.
5. Increase the pressure switch setting slowly until the flame is extinguished and the burner goes
to lockout.
6. Turn the dial down one division and reset the burner. If lockout occurs again, turn the dial down
a further division and reset the burner. Repeat this process until the burner lights and runs
satisfactorily.
7. Turn the adjusting dial down a further two divisions.
8. Switch off the burner and the electrical power supply to the burner. Remove the manometer, if
fitted. Replace the pressure switch cover.
9. Remove the control panel cover and replace the low fire hold link. Replace the cover.
MDFL 3300 & MDFL 4000 Issue 2 08/08 Page 34