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36
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 injector and adjust
the gas valve.
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To change the injector see 6.12.1
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To adjust CO2 value see 7.4.1-2-3
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 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
ADJUSTING THE GAS VALVE
THE GAS VALVE MUST BE SET-UP OR AD-
JUSTED WITH THE AID OF A PROPERLY CALI-
BRATED FLUE GAS ANALYSER.
10.6a
CHECKING THE CO2 AND ADJUSTING THE
GAS VALVE
THE GAS VALVE MUST BE SET-UP OR AD-
JUSTED WITH THE AID OF A PROPERLY CALI-
BRATED FLUE GAS ANALYSER.
Isolate the appliance from the electrical supply
and remove the appliance casing as described in
4.7.1. Set the flue gas analyser to read CO2 and
insert the probe into the flue analysis test point (A,
10.1
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 SUPPLIES FOR DOMESTIC PURPOSES
FLUES
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
10.2
TECHNICAL DATA
Gas Pressures
12HE
15HE
20HE
25HE
30HE
35HE
Inlet pressure
37.00
37.00
37.00
37.00
37.00
37.00
mbar
Maximum gas rate
0.93
1.16
1.55
1.94
2.33
2.69
kg/hr
Minimum gas rate
0.27
0.27
0.39
0.47
0.54
0.54
kg/hr
Injector size
3.6
3.6
3.6
4.7
5.0
5.0
mm
Efficiency
SEDBUK (%)
93.3
92.9
92.6
92.4
92.8
92.9
Band “A”
Band “A”
Band “A”
Band “A”
Band “A”
Band “A”
Emissions
CO max (mg/kWh)
129.0
172.0
215.0
215.0
236.5
268.8
mg/kWh
CO min (mg/kWh)
10.8
10.8
10.8
16.1
32.3
32.3
mg/kWh
NOx max (mg/kWh)
123.6
141.2
97.1
70.6
88.3
88.3
mg/kWh
NOx min (mg/kWh)
35.3
35.3
53.0
53.0
70.6
70.6
mg/kWh
CO
2
max
10.0
10.0
10.0
10.0
10.0
10.0
%
CO
2
min
10.0
10.0
10.0
10.0
10.0
10.0
%
CO/CO
2
ratio (max)
0.001 to 1
0.001 to 1
0.002 to 1
0.002 to 1
0.002 to 1
0.002 to 1
CO/CO
2
ratio (min)
0.0001 to 1
0.0001 to 1
0.0001 to 1
0.0001 to 1
0.0003 to 1
0.0003 to 1
B fig. 31). Restore the electrical supply to the
boiler and switch the boiler to the OFF mode. To
adjust the gas valve you must first ensure that the
fan speed potentiometers (trimmers) have been
set correctly (see 10.7).
Remove the 3-selector knobs, locate and press
the CO button (see fig. 32). The appliance will now
operate in CO mode for approximately 15-minutes
(see 7.10).
10.6.1 GAS VALVE MAXIMUM SETTING
Locate and gently turn the HTG trimmer till the
maximum value (fan speed) is obtained and check
that it corresponds with the appropriate CO2 value
(Maximum) for the respective appliance. If the CO2
reading is correct, proceed to gas valve minimum
setting (10.6.2).
However, If the CO2 reading is incorrect, the
maximum gas pressure must be adjusted as
follows:
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Using a suitable screwdriver, very slowly turn
the maximum adjustment screw (see fig. 33) –
clockwise to decrease, counter clockwise to
increase – until the correct value is displayed on
the CO2 analyser (allow time for the analyser to
stabilise).
10.6.2 GAS VALVE MINIMUM SETTING
Locate and gently turn the HTG trimmer till the
minimum value (fan speed) is obtained and check
that it corresponds with the appropriate CO2 value
(Minimum) for the respective appliance. If the CO2
reading is correct, rotate the HTG trimmer until
