VOKERA Hydra Installation & Servicing Instructions Manual - page 44
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SECTION 10
L.P.G. INSTRUCTIONS
10.3
GAS SUPPLY
The gas supply must be connected to the
appliance by a competent LPG installer and must
be of sufficient size to supply the appliance at its
maximum output.
An existing supply must be checked to ensure
that it is of adequate size to deal with the maximum
rated input of this and any other appliances that
it serves.
10.4
GAS SUPPLY INSTALLATION
The entire installation including the meter, must
be purged and checked for gas soundness.
10.5
ADJUSTING THE GAS VALVE
The gas valve must be set-up or adjusted with
the aid of a properly calibrated flue gas
analyser.
Remove the appliance casing as detailed in
section 4.10. Unclip and remove the air chamber
cover. Set the flue gas analyser to read CO
2
and
insert the probe into the flue analysis test point
(fig.1). Using the procedure as detailed in section
7.4, enter the appliance engineer mode and set
the power to minimum.
10.5.1 MINIMUM SETTING
With the boiler operating at minimum output the
CO
2
reading should be 9.8% (+/- 0.2%). If the CO
2
reading is correct, proceed to 10.5.2. If the CO
2
reading is incorrect, the minimum gas pressure
must be adjusted as follows:
●
using a suitable screwdriver, very slowly turn the
minimum adjustment screw (fig. 33) – clockwise
to increase, counter clockwise to decrease – until
the correct value is displayed on the CO
2
analyser
(allow time for the analyser to stabilise).
●
using the procedure as detailed in section 7.4,
change the power momentarily from minimum
to maximum, then back to minimum.
For details of converting boilers to LPG please refer to the instructions supplied with the relevant conversion kit.
●
check that the correct value is still being
obtained. If not, repeat the above procedure.
10.5.2 MAXIMUM SETTING
The maximum setting must only be checked and/
or adjusted after the correct minimum setting has
been verified. Using the procedure as detailed in
section 7.4, change the power from minimum to
maximum.
With the boiler operating at maximum output the
CO
2
reading should be 9.8% (+/- 0.2%). If the CO
2
reading is correct, press the
reset
button to
exit the appliance engineer mode. If the CO
2
reading is incorrect, the maximum gas pressure
must be adjusted as follows:
●
using a suitable screwdriver, very slowly turn
the maximum adjustment screw (fig. 33) –
clockwise to increase, counter clockwise to
decrease – until the correct value is displayed
on the CO
2
analyser (allow time for the analyser
to stabilise).
●
using the procedure as detailed in section 7.4,
change the power momentarily from maximum
to minimum, then back to maximum.
●
check that the correct value is still being
obtained. If not, repeat the above procedure.
●
press the
reset
button to exit the appliance
engineer mode.
Remove the analyser test probe from the analysis
test point and refit cap. Refit the air chamber
cover. Refit appliance casing.
NOTE
You should ensure that all radiators or heat
emitters are fully open during the above
procedures. This will ensure that the fan speed
(output) of the boiler is not compromised due to a
high flow temperature.
10.1 TECHNICAL DATA
10.2 RELATED DOCUMENTS
BS 6798
BS 5449
BS 5446
BS 5440
BS 5482
PART 1
PART 1
PART 1
INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60 kW
FORCED CIRCULATION HOT WATER SYSTEMS
INSTALLATION OF GAS HOT WATER SUPPLIERS FOR DOMESTIC PURPOSES
FLUES
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
Inlet pressure
Gas rate
Injector size
CO
2
level (cover off)
Soft-light
NOx
CO
CO
2
Maximum
37 mbar
4.09 l/per hr.
Single injector with six 2.3 mm holes
9,80%
3.000RPM*
31 ppm
59 ppm
10% (cover on)
Minimum
37 mbar
1.90 l/per hr.
Single injector with six 2.3 mm holes
9,80%
3.000RPM*
39 ppm
27 ppm
10% (cover on)
* set parameter P. 19 = 30