22
NOTES
When the request for heating and/or hot water has
been satisfied, the appliance pump and fan may
continue to circulate to dissipate any residual heat
within the appliance
.
7.3
SERVICE MODE & PARAMETERS
To check or adjust the service parameters you
must first access the service mode. This mode is
only accessible in OFF mode. To access the
service mode: push INFO and MODE buttons at
the same time for 10 seconds to enter the adjust-
ing menu. The display shows “CodE” (see fig. 36).
Push MODE button and select the service param-
eters code by turning the RH (right-hand) encoder
and confirm it by pushing MODE button
.
7.3.1
PARAMETERS SETTING
Turn the RH (right-hand) encoder to display all
parameters and their values (see fig. 37). When
the required parameter is displayed, push the
MODE button, the current (parameter) value will
flash. To change the parameter value, rotate the
RH (right-hand) encoder until the required value is
displayed, push the MODE button to store the new
value. To exit the service mode push INFO button.
7.4
ADJUSTING MODE & ADJUSTING THE GAS
VALVE
THE GAS VALVE MUST BE SET-UP OR AD-
JUSTED WITH THE AID OF A PROPERLY CALI-
BRATED FLUE GAS ANALYSER.
Fig. 37
Parameter value
Parameter number
Par.
Action
01
set gas type
HP
max fan speed
LP
min fan speed
SP
start-up fan speed
HH
force burner to max power
LL
force burner to min power
MM
force burner to medium power
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. 35). Restore the electrical supply to the
boiler and switch on the boiler. To adjust the gas
valve you must first access the adjusting mode.
This mode is only accessible in STANDBY mode.
To access the adjusting mode: push INFO and
MODE buttons at the same time for 10 seconds to
enter the adjusting menu. The display shows
“CodE” (see fig. 36). Push MODE button and
select the adjust parameters password by turning
the RH (right-hand) encoder and confirm it by
pushing MODE button. The following functions are
available in this mode.
7.4.1
GAS TYPE SETTING - 1
Select the parameter 1 by turning the RH (right-
hand) encoder; push MODE button, it is possible
to set gas type: 1(natural gas) - 2 (LPG), by turn-
ing the RH (right-hand) encoder. Push MODE but-
ton to store the gas type selected.
ATTENTION
Gas type and boiler output
must be
according to
the boiler design specification. Vokera accepts no
responsibility if the gas type and boiler output are
set not according to the appliance specification.
7.4.3
ABSOLUTE MAX FAN SPEED - HP
Select the parameter HP by turning the RH (right-
hand) encoder; push MODE button, it is possible
to set the absolute max fan speed that is related
to gas type and boiler output. Modify this param-
eter only if strictly necessary. The value is shown
on the display as rpm/100 (i.e. 3600/100 = 36). The
set value automatically modifies the max value of
parameter 23.
7.4.4
ABSOLUTE MIN FAN SPEED - LP
Select the parameter LP by turning the RH (right-
hand) encoder; push MODE button, it is possible
to set the absolute min fan speed that is related to
gas type and boiler output. Modify this parameter
only if strictly necessary. The value is shown on
the display as rpm/100 (i.e. 3600/100 = 36). The
set value automatically modifies the min value of
parameter 24.
7.4.5
START-UP FAN SPEED - SP
Select the parameter SP by turning the RH (right-
hand) encoder; push MODE button, it is possible
to set the start-up fan speed. Modify this param-
eter only if strictly necessary. The value is shown
on the display as rpm/100 (i.e. 3600/100 = 36).
7.4.6
GAS VALVE MAXIMUM SETTING - HH
Select the HH parameter by turning the RH (right-
hand) encoder; the boiler starts at the maximum
power, the CO
2
reading should be as shown in the
table below (for LPG see 9.2).
If the CO
2
reading is correct, pass to gas valve
minimum setting (7.4.7). If the CO
2
reading is
incorrect, the maximum gas pressure must be
adjusted as follows:
Fig. 36
MODE
INFO
