50
STEP 5 – Initial Firing of the Appliance
Before firing, ensure that the combustion pot and ash pan are in place as they may have been
displaced during transport/installation (refer to Figure 3). Switch the appliance on, ensuring all
controls are calling for heat.
Under normal conditions the appliance will follow the startup procedure as shown in Figure 18.
The appliance will use its temperature sensors to determine the required heating demand for
the property and will begin to modulate through the powerbands accordingly.
During this time, observe the ‘Information’ menu in order to monitor time clock status,
temperatures, operating modes, Lux and draught information. Guidance on typical values is
provided in Table 3 of this document.
The combustion settings are factory set and cannot be altered, the combustion fan works under
negative pressure (draws exhausted air out of the combustion chamber) and is controlled by the
differential pressure sensor and lambda sensor fitted to the appliance. Fan speed will modulate
depending on the auger feed rate.
STEP 6 – Preset Drop Test
Fuel is delivered to the combustion chamber via an auger mechanism. This will have been
preset to one of 5 modes as part of factory testing. It is advised that the auger mode is
rechecked after the appliance has been installed and operated for a period of at least 30
minutes. This should be performed as part of the commissioning procedure.
The procedure of determining the correct auger mode setting is called a ‘Preset Drop Test’.
This semi-automated test facility runs the auger mechanism for a timed period of 10 minutes,
during which the dropped pellets will be collected and then weighed. The weight of collected
pellets is then compared to 5 bands. This allows the Commissioning Engineer to determine the
correct auger mode setting.
In addition to using appropriate protective gloves, a set of digital scales capable of measuring
up to 1000g and a suitable container that will fit inside the combustion area within the heat
exchanger to collect up to 1000g of pellets will be required (an cold empty ash pan is ideal for
this). The Preset Drop Test procedure is described below:
•
To begin this procedure, switch off the heating demand to the appliance, and observe
that the appliance completes its extinguish cycle and returns to standby mode. This
can be observed and confirmed via the ‘Information’ screen on the User Interface
Controller.
•
Wait until the green combustion door interlock lamp is illuminated. This indicates the
appliance is ready for the combustion door to be opened. Caution should be exercised
as parts contained behind the combustion door may still be hot.
•
When waiting for the green lamp to illuminate, prepare the scales by measuring the
weight of the empty container that will be used to collect the pellets during the test.
This can then be subtracted from the combined weight of the pellets and container
when weighed together. This is crucial as the weight of the pellets alone is used to
determine the correct auger mode. Alternatively, if your scales have a ‘Tare’ function
this may be used to provide the net weight of the pellets alone.
