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37
the correct value is obtained for the respective
appliance (see fan speed table) and proceed to
10.6.3.
However, If the CO2 reading is incorrect, the
minimum gas pressure must be adjusted as fol-
lows:
●
●
●
●
●
Using a suitable screwdriver, very slowly turn
the minimum adjustment screw (see fig. 33) –
clockwise to increase, counter clockwise to
decrease - until the correct value is displayed on
the CO2 analyser (allow time for the analyser to
stabilise).
10.6.3 COMPLETION
On completion of the combustion analysis check
and/or any gas valve adjustment, set the HTG
trimmer to the corresponding value as detailed in
the fan speed table. Refit the 3-selector knobs and
move the mode selector to the OFF position.
Remove the test probe from the test point and refit
the sealing screw/s and/or cap.
IMPORTANT
A GAS SOUNDNESS CHECK MUST BE CAR-
RIED OUT IF ANY GAS CARRYING COMPO-
NENTS HAVE BEEN REMOVED, REPLACED,
OR DISTURBED.
10.7
APPLIANCE FAN SPEEDS
The appliance fan speeds require to be checked
and/or adjusted prior to making any adjustments
to the gas valve or if the main PCB has been
replaced.
ATTENTION
Gas type and appliance fan speed (output) must
be set according to the specific appliance speci-
fication. Vokera accepts no responsibility if the
gas type and/or fan speed is not correctly adjusted
according to the respective appliance specifica-
tion as detailed on the appliance data badge.
10.7.1 CHECKING/ADJUSTING THE APPLIANCE FAN
SPEEDS
Move the selector switch to the OFF position and
remove the 3-selector knobs.
10.7.2 ABSOLUTE MAX FAN SPEED
Locate the MAX trimmer (fig. 32) and gently adjust
clockwise or counter clockwise to achieve the
correct fan speed (see table above).
NOTE
The display shows the fan RPM in multiples of
1000, i.e. 2.5 = 2500RPM.
10.7.3 ABSOLUTE MIN FAN SPEED
Locate the MIN trimmer (fig. 32) and gently adjust
clockwise or counter clockwise to achieve the
correct fan speed (see table above).
NOTE
The display shows the fan RPM in multiples of
1000, i.e. 2.5 = 2500RPM.
10.7.4 IGNITION FAN SPEED
ATTENTION
Do this operation only after the adjusting of
absolute max and min fan speed.
Locate the IGN trimmer (fig. 32) and gently adjust
clockwise or counter clockwise to achieve the
correct fan speed (see table above).
NOTE
The display shows the fan RPM in multiples of
1000, i.e. 2.5 = 2500RPM.
10.7.5 HEATING FAN SPEED
Locate the HTG trimmer (fig. 32) and gently ad-
just clockwise or counter clockwise to achieve
the correct fan speed (see table above).
NOTE
The display shows the fan RPM in multiples of
1000, i.e. 2.5 = 2500RPM.
FAN SPEED (rpm) TABLE
MODEL
MAX
MIN
HTG
IGN
12HE
3.700
1.300
3.500
3.700
15HE
4.100
1.300
4.100
3.700
20HE
5.400
1.700
5.400
3.700
25HE
5.400
1.700
5.400
3.700
30HE
5.200
1.400
5.200
3.700
35HE
6.000
1.400
6.000
3.700