Alpha InTec2 20SE Installation And Servicing Instruction page 30

5.12 CONVERTING THE BOILER TO OPERATE ON LPG
All InTec² boilers are supplied from the factory set to run on Natural Gas (NG). The boiler can be installed and will operate on
Liquid Petroleum Gas (LPG) without any modification however the gas type must be changed on the boiler parameters and a
full calibration procedure conducted to ensure the boiler runs correctly and efficiently.
Following this conversion the new LPG gas data label supplied with the boiler accessory pack must be applied over the
existing data label positioned on the underside of the boiler.
This process must be carried out by an approved Gas Safe registered engineer with the relevant certification for LPG.
Access the parameter menu by setting the DHW selector to 6 o'clock and the CH
selector to 9 o'clock (see Fig. 5.4) then pressing the 'RESET' and 'Summer/Winter'
buttons simultaneously for about 8 seconds.
Once the parameter menu is accessed there are five parameter groups (G, P, t, A,
F) group G is required for the gas type selection. Group G is normally the first to be
displayed, if not; press the 'Summer/Winter' button to scroll through to the required group.
Now use the CH selector dial to change between gas types nG representing Natural Gas
and LG for LPG. Once the required gas type is selected press the 'Reset' button to store
'88' will appear on the screen to confirm the change has been made.
Exit the parameter menu by either pressing the 'RESET' and 'Summer/Winter' buttons
simultaneously or waiting for 15 minutes to automatically exit.
The boiler will now display the code E62 indicating the gas type has been changed and that full calibration is now required.
Follow the full calibration procedure in Section 5.13 to set the boiler combustion correctly.
5.13 CO SET UP PROCEDURE
2
The air gas ratio of the boiler has been factory set and should not require adjusting during first commission. If adjustment is
recommended or required the engineer must be competent to carry out this work.
Before starting this procedure please check the following:
The front case is fitted.
The flue system is not blocked or restricted and is to the correct specification.
The gas supply working pressure is correct and the system has been purged.
The condensate trap is pre-filled.
There is no request for heating or hot water.
Full calibration procedure
Adjustment to the combustion is necessary when the following work is carried out;
1. The boiler has been converted to operate with a different type of gas – see Section 5.12.
2. A new PCB is fitted and the original PCB memory chip has not been retained. (note: the parameters may also require
changing in this instance).
3. A new burner is fitted.
4. A new ignition/sensing electrode is fitted.
If changing parts in 3 and 4 above, full calibration is only required if the CO
standard combustion check procedure.
To access the calibration mode, turn the DHW selector to 6 o'clock and the CH selector to 9 o'clock (see Fig. 5.4). Press the
'RESET' button for eight seconds until the parasol and snowman (
press the 'Summer/Winter' (
gas CO levels can be adjusted at three different outputs levels, maximum (99%), medium (47 to 85% pre-set) and minimum
2
(00%) in order to fully calibrate the boiler.
At this stage the display shows flashing icons: 'summer', 'winter', 'standby' and the operating temperature alternating
between the current heat output (99 = max. output). See Fig. 5.5.
The boiler will go through an initial lighting sequence and then stabilise at maximum output, then
the border around the flame symbol will start to flash, (this process will take a few minutes).
With the border flashing press the reset button, a flashing
will alternate between the operating temperature and the gas valve setting value. With a flue gas
analyser connected to the correct sampling point, Press the 'Standby' button to increase the
valve setting and decrease the CO
increase the CO . When the correct CO
2
border to flash to confirm the adjustment and then press reset to store the setting.
Set the CO values according to the values indicated in Section 2.1 for the correct boiler model.
2
To move to the medium CO
the 'INFO' button again to move on to the minimum setting and repeat the procedure.
If the flow temperatures are getting up to maximum operating temperature during the procedure it is possible to open a hot
tap and turn the controls to heating and hot water demand.
Note: In this mode only the boiler flow sensor controls the maximum temperature.
30
Alpha InTec² 20SE and 30SE - Commissioning
) button within three seconds to enter the setup menu. When in this setup menu the flue
, or press the 'INFO' button to decrease the valve setting and
2
level has been set, wait for the flame present symbol
2
setting press the 'INFO' button and adjust (if required) using the same method as above. Press
2
values are incorrect following fast calibration and
2
) flash at the same time (chimney sweep mode), then
symbol will appear and the display
Fig. 5.4
Fig. 5.5