32
Mynute 24m
10.1
TECHNICAL DATA
SECTION 10
L.P.G. INSTRUCTIONS
10.3
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 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
CHECKING AND ADJUSTING BURNER PRES-
SURES (fig. 17)
Although the burner pressure is factory set, it is
necessary to check it during servicing or if the gas
valve has been removed.
Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test nipple.
Remove the compensator tube.
10.5.1 SETTING THE MAXIMUM BURNER PRESSURE
Light the boiler as described in 5.6 and compare
the reading on the manometer with the value
described in 10.1. If adjustment is required, re-
move 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.
NOTE
You should ensure that all radiators or heat emit-
ters are fully open during the above procedure.
This will ensure that the output of the boiler (burner
pressure) is not compromised due to a high flow
temperature.
10.5.2 SETTING THE MINIMUM BURNER PRESSURE
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)
cross-head screw clockwise to increase, or coun-
ter-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, replace the protective cap, refit
the compensator tube, refit the grey wire to the
modulating coil, remove the manometer and
tighten the outlet test nipple.
IMPORTANT
A GAS SOUNDNESS CHECK MUST BE CAR-
RIED OUT.
BS 6798
1987
INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60 kW
BS 5449
PART 1
1990
FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546
1990
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 5440
PART 1
1990
FLUES
BS 5482
PART 1
1994
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
10.2
RELATED DOCUMENTS
For details of converting boilers to LPG please refer to the instructions supplied with the relevant conversation kit.
GAS PRESSURES
Inlet pressure
37 mbar
Maximum burner pressure
36 mbar
Minimum burner pressure
7.3 mbar
Gas rate maximum
2.04 Sm
3
/h
Gas rate minimum
0.87 Sm
3
/h
Injector quantity
12
Injector size
0.77 mm
