32
10.1 RELATED DOCUMENTS
BS 5440
PARTS 1 & 2
FLUES & VENTILATION REQUIREMENTS
BS 5449
PART 1
FORCED CIRCULATION OF HOT WATER SYSTEMS
BS 5482
PART 1
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
BS 5546
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 6798
INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
SECTION 10 - LPG INSTRUCTIONS
10.6 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 ANA-
LYSER.
Isolate the appliance from the electrical supply and remove
the appliance casing as described in 4.7.1. Set the fl ue gas
analyser to read CO
2
and insert the probe into the fl ue analysis
test point (fi g. 40). Restore the electrical supply to the boiler
and switch the boiler to the OFF mode.
Have access to the printed circuit board, locate and open the
closing plug on the dash board
(L2
fi g. 43
)
, locate and press
the CO
button (see fi g. 43 pos. SW1). The appliance will now
operate in CO
2
mode for approximately 15-minutes.
10.6.1 CO
2
FUNCTION SETTINGS
Locate the CO
button (see 7.3)
Select the main selector switch in position
10.3 CONVERTING THE APPLIANCE GAS TYPE
To convert the appliance to another gas type it is necessary to
change the injector and adjust the gas valve (CO
2
).
To change the injector see 6.12.1
To adjust CO2 values see 10.6
10.4 GAS SUPPLY
The gas supply must be connected to the appliance by a com-
petent LPG installer and must be of suffi cient 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 tightness.
10.2 TECHNICAL DATA
Gas Pressures
Mynute
i20
Mynute
i30
Inlet pressure
37.0 mbar
37.0 mbar
Heating maximum gas rate (kg/hr)
1.55
2.33
Minimum gas rate (kg/hr)
0.31
0.39
Injector size
3.4 mm (fl ap side) - 3.25 mm (free side)
3.55 mm (fl ap side) - 3.55 mm (free side)
CO
2
@ maximum output (%)
10.0
10.0
CO
2
@ minimum output (%)
10.0
10.0
CO @ maximum output (ppm)
190
160
CO @ minimum output (ppm)
20
15
CO
2
FUNCTIONS
ACTION ON THE BUTTON
DISPLAY
combustion analysis mode
press once = burner running at maximum heating
ACO
gas valve maximun setting
press twice = burner running at maximum absolute
ACO
gas valve minimum setting
press three time = burner running at minimum
ACO
10.6.2 GAS VALVE MAXIMUM SETTING
Set the CO
button at maximum (see 10.3.1), once the maximum
is obtained check that it corresponds with the appropriate CO
2
value (Maximum) for the respective appliance. If the CO
2
read-
ing is correct, proceed to gas valve minimum setting (10.7.2).
However, if the CO
2
reading is incorrect, the maximum gas
pressure must be adjusted as follows:
using a 2.5mm Allen key, very slowly turn the maximum ad-
justment screw (see fi g. 44) – 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
Set the CO
button at minimum (see 10.3.1), once the minimum
is obtained check that it corresponds with the appropriate CO
2
value (Minimum) for the respective appliance. If the CO
2
read-
ing is correct, proceed to completion (10.7.3).
However, if the CO
2
reading is incorrect, the minimum gas
pressure must be adjusted as follows:
locate the minimum adjustment screw (fi g. 44), using a suit-
able screwdriver remove the protection plug
using a 4mm Allen key, very slowly turn the minimum adjust-
ment screw (see fi g. 44) - clockwise to increase, counter
clockwise to decrease - until the correct value is displayed
on the CO
2
analyser (allow time for the analyser to stabilise).
10.6.4 COMPLETION
On completion of the combustion analysis check and/or any
gas valve adjustment, refi t the plug
(L2
j
)
and move the mode
selector to the
position. Remove the test probe from the
test point and refi t the sealing screw/s and/or cap.
IMPORTANT
A GAS TIGHTNESS CHECK MUST BE CARRIED OUT IF ANY
GAS CARRYING COMPONENTS HAVE BEEN REMOVED,
REPLACED OR DISTURBED.
ATTENTION
Gas type and appliance output
must be set
according to the
specifi c appliance specifi cation. Vokèra accepts no responsi-
bility if the gas type is not correctly adjusted according to the
respective appliance specifi cation as detailed on the appliance
data badge.
Summary of Contents for Mynute i20
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