3 Commissioning Procedure
Mk8 MM Manual Page | 77
3.4.5 Phase Hold
When the system is in commissioning mode only, the Phase Hold feature enables the commissioning
engineer to pause the ignition sequence of the burner to make adjustments to the gas regulator if needed.
The phase hold feature can be used in pilot open, pilot proving and main flame proving. If the phase is held
in the pilot open stage and the flame goes out, a lockout will occur after 20 seconds. However, if the phase is
held in either the pilot proving or main flame proving stages, the MM will lockout immediately if the flame
scanner does not detect a flame.
If the flame is present and the ‘phase hold’ condition is left indefinitely the ‘Freeze Timeout’ lockout will occur
after 10 minutes. When the system is in a run mode the facility is disabled.
To make adjustments with the gas manually, press to keep the system at its current phase
positions, a little blue dot on this ‘button’ will appear to indicate that the phase is held. Ensure that the main
fuel valve is manually isolated until the pilot flame has been successfully established. Once this has been
successfully established, gradually introduce the main fuel supply to the burner while observing the flame
stability. Continue to introduce fuel until the manual operated main fuel isolation valve is fully open providing
safe and stable combustion that can be maintained. If the combustion is not safe and stable, then adjust the
fuel/air ratio accordingly. Once the adjustments have been made, press to continue with the
commissioning process.
WARNING: IT IS THE RESPONSIBILITY OF THE FACTORY TRAINED TECHNICIAN TO ENSURE THAT
USE OF THE PHASE HOLD FACILITY DOES NOT LEAD TO A HAZADOUS SITUATION. FAILURE TO
DO SO WILL RESULT IN SERIOUS EQUIPMENT DAMAGE, CRITICAL INJURY OR DEATH.
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