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42
SECTION 10
L.P.G. 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 JP3 is enabled or
disabled according to the gas type used.
●
To change the injectors see section 6.
●
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. 26)
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. 40
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
BS 6798
INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
BS 5449
PART 1
FORCED CIRCULATION 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
10.1
RELATED DOCUMENTS
10.2
TECHNICAL DATA
GAS PRESSURES
25
29
35
Inlet pressure
37 mbar
37 mbar
37 mbar
Burner pressure maximum
35.70 mbar
35.50 mbar
35.60 mbar
Burner pressure minimum (heating)
12.80 mbar
10.00 mbar
7.00 mbar
Burner pressure minimum (DHW)
4.90 mbar
4.50 mbar
3.20 mbar
Maximum gas rate
1.94 Kg/h
2.25 Kg/h
2.70 Kg/h
Minimum gas rate
1.16 Kg/h
1.16 Kg/h
1.16 Kg/h
Injectot size (quantity)
12 x 0.76
14 x 0.76
16 x 0.76
SEDBUK (%)
87.1 Band “B”
87.7 Band “B”
89.57 Band “B”
NOx (max - min) PPM
250 - 170
250 - 180
250 - 180
CO (max - min) PPM
90 - 100
120 - 120
65 - 120
CO
2
(%)
7.50 - 4.35
7.60 - 4.50
7.60 - 3.05
CO/CO
2
ratio (max - min)
0.0012 to 1 - 0.0022 to 1
0.0015 to 1 - 0.0026 to 1
0.0008 to 1 - 0.0039 to 1
10.6.2 SETTING THE MINIMUM BURNER PRESSURE
fig. 39
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 de-
scribed in 10.2.
If adjustment is required, turn the inner (red)
crosshead 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
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.
