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SECTION 10 LPG INSTRUCTIONS
10.1 RELATED DOCUMENTS
BS 6798 INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
BS 5449 PART 1 FORCED CIRCULATION OF HOT WATER SYSTEMS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 5440 PART 1 FLUES
BS 5482 PART 1 DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
10.2
Gas Pressures 726 730 735
Inlet pressure (G31) 37 mbar
Burner pressure maximum 36 mbar
Burner pressure minimum 4.0 mbar 3.5 mbar 2.8mbar
Maximum gas rate 2.19 kg/h 2.53 kg/h 2.94 kg/h
Minimum gas rate 0.70 kg/h 0.75 kg/h 0.77 kg/h
Injector size (quantity) 12 x 0.8 mm 14 x 0.8 mm 16 x 0.8 mm
10.3 CONVERTING THE APPLIANCE GAS TYPE
To convert the appliance to another gas type it is
necessary to change the burner injectors and
adjust the gas pressures. It is also necessary to
ensure the jumper tag at JP8 is enabled or disa-
bled according to the gas type used.
●●
●●
● To change the injectors see 6.15
●●
●●
● For correct jumper tag configuration see 7.8
10.4 GAS SUPPLY
The gas supply must be connected to the appli-
ance 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 maxi-
mum rated input of this and any other appliances
that it serves.
10.5 GAS SUPPLY INSTALLATION
The entire installation including the meter must
be purged and checked for gas soundness.
10.6 CHECKING AND ADJUSTING BURNER PRES-
SURE (see fig. 16)
Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test point.
10.6.1 SETTING THE MAXIMUM BURNER PRES-
SURE fig. 41
Light the boiler as described in 5.7, fully open a
DHW outlet (preferably the bath), and ensure the
HW temperature selector is set at maximum. Al-
low the appliance to stabilise.
Compare the reading on the manometer with the
value described in 10.2. If adjustment is required,
remove the protective cap from the gas valve
modulating coil assembly and turn the outer
(10mm) nut clockwise to increase, or counter-
clockwise to decrease the burner pressure.
10.6.2 SETTING THE MIMIMUM BURNER PRES-
SURE fig. 42
Once the maximum burner pressure has been
checked and/or adjusted, remove one of the grey
wires from the modulating coil. Compare the read-
ing on the manometer with the value described
in 10.2. If adjustment is required, turn the inner
(red) crosshead screw clockwise to increase, or
counter-clockwise to decrease the burner pres-
sure, whilst ensuring that the outer (10mm) nut
does not move. When checking and/or adjust-
ment has been completed, isolate the appliance
from the electrical supply, close the DHW outlet,
replace the protective cap, refit the grey wire to
the modulating coil, remove the manometer, and
tighten the outlet test point.
IMPORTANT, A GAS SOUNDNESS CHECK
MUST BE CARRIED OUT.
(40 pages)
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