10 Water Level Control
Mk8 MM Manual Page | 187
10.9 Commissioning Procedure
10.9.1 Commissioning Checks
When commissioning a burner with Autoflame water level cotnrol, the water level probes and external water
level sensor must be commissioned initially before the combustion curve is put in. Once the burner is
commissioned with the Mk8 MM, the water level probes will need to be recommissioned once the boiler is up
to pressure, and water in the boiler is hot enough.
When all the installation and 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 for all valves.
Please refer to section 3.5.4 for the Installation and Safety Guidelines.
10.9.2 Levels
End of Probe: The end of probe level is used to identify the point below which the probe cannot obtain a
valid water level, it has no operational use.
High: A high water level, although not dangerous, it is undesirable as water particles may infiltrate the steam
header. If the boiler water level goes above this point the burner may or may not continue to run depending
on the system configuration. If a high water level condition is detected, a high water audible and visual
indicators are triggered to notify the user. The audible indicator may be muted by means of the mute/reset
push button. The burner can be set to continue or stop firing at high water in expansion option 9.
Control Point: This is the ideal water level that the feed water control will try to maintain.
1st Low: A 1st low water level is a point below the control point at which the burner will turn off. If the water
level falls below this point, a 1
st
low audible and visual indicators are activated. The audible indicator may be
muted by means of the mute/reset push button. If the water level is restored above this point the burner will
start automatically and all indicators will also be reset.
2
nd
Low: A 2
nd
low water level is a point below 1st low at which the burner will remain off. If the water level
falls below this point, a 2
nd
low audible and visual indicators are triggered. The audible indicator may be
muted by means of the mute/reset push button. Even if the water level is restored above this point the burner
will remain off. Operator intervention is required to manually reset the system and can only be performed
once the level is above the 2
nd
low point. The 2
nd
low reset condition is non-volatile - if the system is powered
down the reset condition will remain when power is reapplied. In this scenario the operator reset will still be
necessary.
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