6.7 CHECKING THE COMBUSTION - CHIMNEY SWEEP MODE
As part of the Benchmark Checklist procedure the combustion levels of the boiler when the installation
is completed must be measured and recorded.
The air gas ratio of the boiler has been factory-set and should not require adjusting during commissioning. If
adjustment is recommended or required the engineer must be competent to carry out this work. See Fig. 6.3 for
analyser test point.
If the boiler requires adjusting or setting to operate on LPG, further guidance is detailed in Section 6.12.
Chimney Sweep Mode - See Fig. 6.2.
Without any CH or DHW demand, press and hold the reset button for five seconds and the boiler will fire at a fixed output.
'Sc' will be shown on the display (DHW digits) to indicate this mode, if a Climatic controller is fitted it will display ERR>07
code on the controller (this is not a fault).
Once the function is activated, it is possible to select whether to make
the check in CH status or DHW status by opening any hot water tap.
If the function is active in CH mode, the CH +/- buttons can be used
to select the power from minimum power (0%) to maximum CH power
(99%) in 1% intervals. If the function is active in DHW mode the CH +/-
buttons can be used to select the power from minimum power (0%) to
maximum DHW power (99%) in 1% intervals.
The central heating or DHW operating mode is displayed by the
relative symbols (
) or ( ) flashing.
This mode will remain active for fifteen minutes or can be cancelled by
pressing the 'RESET' button.
Use the CH down button to set the output to minimum to check
the minimum CO
2 reading, wait for the boiler stabilise, check the
combustion and record the reading.
Use the CH up button to set the output to maximum to check the
maximum heating CO2, again allow the burner to stabalise and record the reading.
If the CO
2 readings are not within the stated tolerance (refer to Section 3.1) then check the installation including the
complete flue assembly and repeat the above process.
When checking at maximum output the boiler will have a higher noise level, this is normal.
6.8 FINAL COMMISSIONING
1. Allow the heating system to heat up, then balance the system to achieve the necessary temperature
difference across the heating flow and return pipes at the boiler and check the system volume and pressure.
(Refer to Section 3.1).
2. Turn off the boiler.
3. Thoroughly flush out the water pipework (refer to Section 4.8). Clean the mains water inlet filter (see Fig. 5.4).
4. Refill and re-pressurise the system as described in Section 6.1.
5. Add the correct level of inhibitor to the system as detailed in the instructions supplied with the inhibitor.
6.9 FINAL ASSEMBLY
1. If the boiler is to be left in service with the User, set the controls, clock (if fitted, see User's Operating manual) and
room thermostat (if fitted) to the User's requirements.
2. If the boiler is not to be handed over immediately, close the boiler gas service cock and switch off the electrical supply.
3. If there is any possibility of the boiler being left during frost conditions, then the boiler and system should be drained
(refer to Section 8.2). It is recommended that a label is attached to the boiler drawing attention to the fact that the
system has been drained.
4. Complete the details of the installation in the Benchmark Checklist at the back of these instructions.
Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning
MODEINFORESET
+
-
+
-
Fig. 6.2
36
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