2.4
ADJUSTMENTS
2.4.1
BURNER COMMISSIONING AND STARTING UP
Before attempting to light the burner for the first time, suitably qualified and competent personnel
should inspect the installation to ensure the followings:
a.
That all electrical safety circuits are made and the electrical installation has been carried out
according to the instructions in this manual.
b.
There must be an adequate ground to the burner and the Live and Neutral should be correctly
connected.
c.
The gas supplied is of the type for which the appliance is delivered and factory pre-settled.
Otherwise, see the following section 2.4.2.
d.
The gas pipe work is of a suitable size for the burner requirements and the installation has
been checked for leaks and fully purged.
e.
The insulating blank placed on the special intermediate section (combustion chamber zone), is
entire and correctly assembled.
f.
The condensate drain siphon is filled with water.
THE FOLLOWING OPERATIONS MUST BE CARRIED OUT BY AN MHS AUTHORISED SERVICE
ENGINEER.
Press the On/Off button and after a few seconds the burner should start to pre-purge. Ignition will
commence and the fan will stay at ignition speed for 10 seconds. The burner is pre-programmed
with a step-control so it will not reach maximum fan speed for at least 90 seconds after this.
FIRST check:
manually drive the fan speed back to maximum by pressing the SERVICE button at the same time
as the (“PLUS”) button and holding them down for 3 seconds. Check the CO
2
levels. These
should be the same as for those shown in the following Table.
Gas Type
CO
2
G20 – Natural Gas
8,9 – 9,0 %
NOTE: check the flue temperature too. If it is very higher than the value shown in the table of
section 1.4., check and improve the tightness of the insulating blank placed on the special
intermediate section (combustion chamber zone), eventually replacing it.
SECOND check:
drive the fan speed manually to the minimum setting.
This is done by pressing and holding down for 3 seconds the SERVICE button below the STATUS
display at the same time as the (“MINUS”) button.
The STATUS display will now show “L''.
Recheck the CO
2
levels. These should now be the same as for those shown in the following Table.
Gas Type
CO
2
G20 – Natural Gas
8,5 – 8,6 %
If adjustments are required to obtain the correct flue gas temperature and CO
2
levels, do this
by carrying out the following procedure step by step.
THROTTLE ADJUSTMENT
a. Manually drive the fan speed back to maximum by pressing the SERVICE button as before, but
this time at the same time as the “PLUS” button. Again hold them both down for 3 seconds (the
STATUS display should now show “H”).
b. To increase the CO
2
levels at the maximum fan speeds, turn the Throttle screw anti-clockwise
very slowly, checking the levels constantly until the desired level is reached (see next Figure for
position of Throttle adjustment screw).
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