Related Documents; Technical Data; Converting The Appliance Gas Type; Gas Supply - Benchmark Procombi A Series Installation & Servicing Instructions Manual

SECTION 10 LPG INSTRUCTIONS

10.1 RELATED DOCUMENTS

BS 5440 PARTS 1 & 2
BS 5449 PART 1
BS 5482 PART 1
BS 5546
BS 6798
10.2
Gas Pressures
I
nlet pressure
Maximum gas rate (kg/hr)
Minimum gas rate (kg/hr)
Injector size
CO max (%)
2
CO min (%)
2
CO max (mg/kWh)
CO max (mg/kWh)
NOx max (PPM) mg/kWh
NOx min (PPM) mg/kWh
CO/CO ratio @ max
2
CO/CO ratio @ min
2
SEDBUK 'A' (%)
10.3

CONVERTING THE APPLIANCE GAS TYPE

To convert the appliance to another gas type it is
necessary to change the burner injector, adjust
the appliance fan speeds and adjust the gas valve
(CO ).
2
• To change the injector see 6.12.1
• To adjust the fan speeds see 10.7
• To adjust CO2 values see 10.6
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 CHECKING THE CO
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 CO
insert the probe into the flue analysis test point (A,
B fig. 35). 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 (fig. 36). The appliance will now
30
FLUES & VENTILATION REQUIREMENTS
FORCED CIRCULATION OF HOT WATER SYSTEMS
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT
DWELLINGS
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC
PURPOSES
INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
Procombi A28
2.17
0.47
4.7mm
10.0
10.0
182.8
32.3
70.6
53.0
0.002 to 1
0.004 to 1
92.4
AND ADJUSTING THE
2
and
2
Procombi A32
37.0mbar
2.48
0.54
4.7mm
10.0
10.0
215.0
21.5
88.3
53.0
0.002 to 1
0.004 to 1
2.7
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 (max) is obtained and
check that it corresponds with the appropriate CO
value (maximum) for the respective appliance. If
the CO reading is correct, proceed to gas valve
2
minimum setting (10.6.2).
However, if the CO
maximum gas pressure must be adjusted as
follows:
• using a 2.5mm Allen key, very slowly turn the
maximum adjustment screw (fig. 38) – clock-
wise to decrease, counter clockwise to increase
– until the correct value is displayed on the CO
analyser (allow time for the analyser to stabi-
lise).
10.6.2 GAS VALVE MINIMUM SETTING
Locate and gently turn the HTG trimmer till the
minimum value fan speed (min) is obtained and
check that it corresponds with the appropriate CO
value (minimum) for the respective appliance. If
the CO reading is correct, rotate the HTG trim-
2
mer until the correct value is obtained for the re-
spective appliance (see fan speed table) and pro-
ceed to 10.6.3.
However, if the CO
mum gas pressure must be adjusted as follows:
• using a suitable screwdriver, very slowly turn the
minimum adjustment screw (fig. 38) – clockwise
to increase, counter clockwise to decrease -
until the correct value is displayed on the CO
analyser (allow time for the analyser to stabi-
lise).
Procombi A36
2.80
0.54
5.0mm
10.0
10.0
236.5
21.5
8.3
70.6
0.002 to 1
0.004 to 1
92.7
reading is incorrect, the
2
reading is incorrect, the mini-
2
2
2
2
2