Repeat these steps for the remaining water levels. The number of levels to be entered is dependent on
the configuration of Expansion Options 1.1.
After entering the high position the RUN button will begin to flash. Before proceeding further, reduce
the water level to the control point level. This will prevent the unit from registering a high water alarm
immediately after the system has reset.
Once the capacitance probes have been commissioned, the water level operation must be checked for
safety and alarms, then the burner can be commissioned and the probes re-commissioned when there is
heat in the boiler.
2.3.2 Operational Checks
All local & national codes for safe operation of boiler plant must be respected. If in any
doubt contact your local specialist authority.
Water level operation must be checked after commissioning or subsequent to modification of any
setups. These operational checks are for boilers without a shunt switch, see section 5.6 for shunt switch.
Set the system to RUN mode and allow the burner to fire. With the boiler supplying steam at a steady
rate check that the water level is maintained at the control point for modulating control. For on/off
control, check that the boiler feed water pump turns on and off appropriately at the commissioned
points. Ensure that all audible and visual alarm indicators are inactive.
Reduce the level of the water (by blow down or other suitable means). Check that a 1st low alarm
occurs and the burner stops firing when the water level is just below the commissioned 1st low level.
Ensure that the 1st low audible and visual indicators are active. If fitted, press the external mute/reset
button and check that the audible alarm is muted.
Reduce the level of the water further and check that the 2nd low alarm is displayed when the water
level is just below the commissioned 2nd low level; the burner will remain off.
Ensure that the 2nd low audible and visual indicators are active. If fitted, press the external mute/reset
button and check that the audible alarm is muted.
All 1st Low/2nd low alarm conditions must be cleared before proceeding to test the high water. To test
high water it will be necessary to increase the water level to just above that of the commissioned high
water position. If there is no means to manually increase the level of the water it is possible to select
Water Level Commission mode and increase the level of the water manually. This can be performed by
using the CH1 and CH2 controls. The unit can then be restarted by de-selecting and re-selecting the
fuel. The unit will restart in RUN mode and should report a high water alarm. Check the burner
operation runs or stops according to expansion option 8.1.
Ensure that the high water audible and visual indicators are active. If fitted, press the external
mute/reset button to check that the audible alarm is muted.
Check the operation of the TB output terminal if using a contactor with solenoid valve.
Once the water level control has passed these operational checks, the burner can now be
commissioned with a fuel to air curve, after which the probes are re-commissioned at boiler pressure.
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