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49
SECTION 10 LPG INSTRUCTIONS
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
disabled 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
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.
10.5
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 (see fig. 44)
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.
Allow 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 PRESSURE
(see fig. 45)
Once the maximum burner pressure has been
checked and/or adjusted, remove one of the grey
wires from the modulating coil. Compare the
reading 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 pressure, whilst ensuring that the outer
(10mm) nut does not move. When checking and/
or adjustment 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.
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
25
29
35
Inlet pressure (G31)
37 mbar
Burner pressure maximum
35.5 mbar
35.5 mbar
35.4 mbar
Burner pressure minimum
6.1 mbar
4.5 mbar
3.4 mbar
Maximum gas rate
1.94kg/h
2.25 kg/h
2.72 kg/h
Minimum gas rate
0.77 kg/h
0.77 kg/h
0.77 kg/h
Injector size (quantity)
12 x 0.75 mm
14 x 0.75 mm
16 x 0.77 mm
Flue details (concentric)
Max horizontal flue length (60/100mm)
5.75m
3.75m
0.75m
Max vertical flue length (60/100mm)
6.55m
4.55m
1.55m
Max horizontal flue length (80/125mm)
13.80m
11.80m
6.75m
Max vertical flue length (80/125mm)
15.30m
13.30m
8.25m
Efficiency
SEDBUK (%)
90.7
89.8
90.5