34
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 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 ADJUSTING THE GAS VALVE
THE GAS VALVE MUST BE SET-UP OR ADJUSTED
WITH THE AID OF A PROPERLY CALIBRATED FLUE
GAS ANALYSER.
10.6.1 CHECKING THE CO
2
AND ADJUSTING THE
GAS VALVE
THE GAS VALVE MUST BE SET-UP OR ADJUSTED
WITH THE AID OF A PROPERLY CALIBRATED 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 CO
2
and insert the probe into the flue
analysis test point (
A, B
fig. 28). 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).
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
20HE
Inlet pressure
37.00
Maximum gas rate
1.55
kg/hr
Minimum gas rate
0.39
kg/hr
Injector size
3.6
mm
Efficiency
SEDBUK (%)
92.6
Band “A”
Emissions
CO max (mg/kWh)
215.0
mg/kWh
CO min (mg/kWh)
10.8
mg/kWh
NOx max (mg/kWh)
97.1
mg/kWh
NOx min (mg/kWh)
53.0
mg/kWh
CO
2
max
10.0
%
CO
2
min
10.0
%
CO/CO
2
ratio (max)
0.002 to 1
CO/CO
2
ratio (min)
0.0001 to 1
When carrying out a combustion analysis test and/or
adjusting the gas valve, you must ensure that all radiators
and heating circuits are fully open in order to dissipate
heat.
Remove the 3-selector knobs, locate and press the CO
button (see fig. 29). The appliance will now operate in CO
mode for approximately 15-minutes (see 7.10).
10.6.2 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 CO
2
value (Maximum) for the
respective appliance. If the CO
2
reading is correct, proceed
to gas valve minimum setting (10.6.2).
However, if the CO
2
reading is incorrect, the maximum gas
pressure must be adjusted as follows:
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Using a 2,5mm Allen key, very slowly turn the maximum
adjustment screw (see fig. 30) – clockwise to decrease,
counter clockwise to increase – until the correct value is
displayed on the CO
2
analyser (allow time for the
analyser to stabilise).
10.6.3 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 CO
2
value (Minimum) for the respective
appliance. If the CO
2
reading is correct, rotate the HTG
trimmer until the correct value is obtained for the respective
appliance (see fan speed table) and proceed to 10.6.3.
However, if the CO
2
reading is incorrect, the minimum gas
pressure must be adjusted as follows:
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Using a 2,5mm Allen key, very slowly turn the minimum
adjustment screw (see fig. 30) – clockwise to increase,
counter clockwise to decrease - until the correct value is
displayed on the CO2 analyser (allow time for the
analyser to stabilise).