27
9.1 RELATED DOCUMENTS
SECTION 9 - LPG INSTRUCTIONS
9.6 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
ANALYSER.
Isolate the appliance from the electrical supply and remove the
appliance casing as described in 4.7.1. 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
), locate and press the CO
button (see fig. 36 pos.
SW1
). Press the button the number of
times according the function requirement as par 7.3.1.
Set the flue gas analyser to read CO
2
, allow the burner to
stabilise and insert the probe into the flue analysis test point
(Y1-Z1 fig. 33). The appliance will operate in CO
2
mode for
approximately 15 minutes.
9.6.1 CO
2
FUNCTION SETTINGS
Locate the CO
button (see 7.3).
Select the main selector switch in position
.
CO
2
FUNCTIONS
ACTION ON THE BUTTON
LED STATUS
combustion analysis mode
press once = burner running at maximum heating
yellow led blinking
gas valve maximun setting
press twice = burner running at maximum DHW
yellow led bl red led fixed
gas valve minimum setting
press three time = burner running at minimum
yellow led bl green led fixed
NOTE
1 - Any additional pressing of CO
button after the third time the burner switched between maximum DHW and minimum.
2 - To restart the CO
2
function it is necessary to pass throught the
position with the main selector switch.
9.3 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 replace the flange on the silencer (only Easi-Heat Plus C
29) see 6.15.
• To adjust CO
2
values see 9.6.
9.4 GAS SUPPLY
The gas supply must be connected to the appliance by a com-
petent 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.
9.5 GAS SUPPLY INSTALLATION
The entire installation including the meter must be purged and
checked for gas tightness.
9.2 TECHNICAL DATA
Gas Pressures
Easi-Heat Plus 25 C
Easi-Heat Plus 29 C
Inlet pressure
37.0 mbar
37.0 mbar
Heating maximum gas rate (kg/hr)
1.55
1.94
DHW maximum gas rate (kg/hr)
1.94
2.25
Minimum gas rate (kg/hr)
0.39
0.47
Injector size
3.8 mm
3.9
Silencer flange
27 mm
29 mm
CO
2
@ maximum output (%)
10.5
10.5
CO
2
@ minimum output (%)
10.5
10.5
CO @ maximum output (ppm)
190
250
CO @ minimum output (ppm)
20
25
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
9.6.2 GAS VALVE MAXIMUM SETTING
Set the CO
button at maximum (see 9.6.1), 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 (9.6.2).
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 fig. 37) – 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).
9.6.3 GAS VALVE MINIMUM SETTING
Set the CO
button at minimum (see 9.6.1), 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 (9.6.4).
However, if the CO
2
reading is incorrect, the minimum gas
pressure must be adjusted as follows:
• locate the minimum adjustment screw (fig. 37), using a suit-
able screwdriver remove the protection plug
• using a 4mm Allen key, very slowly turn the minimum adjust-
ment screw (see fig. 37) - 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).
9.6.4 COMPLETION
On completion of the combustion analysis check and/or any
gas valve adjustment, refit the plug (fig. 36 -
L2
) and move the
mode selector to the
position. Remove the test probe from
the test point and refit 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
specific appliance specification. Vokèra accepts no responsi-
bility if the gas type is not correctly adjusted according to the
respective appliance specification as detailed on the appliance
data badge.
