Range Rated; Gas Valve Calibration - Riello Vokera EASI-HEAT i User Instructions

After completing the check:
ƒ quit the function by pressing
ƒ reposition the previously removed components
ƒ set the boiler to the required operating mode, depending on
the season
ƒ regulate the heat request temperature values according to the
customer's needs.
b
When the combustion analysis function is active, all
heat requests are inhibited and the message "CO" ap-
pears on the display.
IMPORTANT
The combustion analysis function is active for max. 15 minutes;
the burner shuts down if a delivery temperature of 95°C is rea-
ched. It will ignite again when the temperature falls below 75°C.
b
The combustion analysis function is usually carried out
with the 3-way valve on heating. The 3-way valve can be
switched to DHW by generating a DHW request at the
maximum output while the function itself is still active.
In this case, the DHW temperature will be limited to a
maximum value of 65°C. Wait for the burner to fire.
5.22 ADJUSTMENTS
The boiler has already been adjusted by the manufacturer. If the
adjustments need to be made again however e.g. following ex-
traordinary maintenance, after the replacement of the gas valve,
after conversion from methane gas to LPG or vice versa, follow
the procedures described below. The adjustment of the maximum
and minimum output, maximum heating and slow ignition must
be made in the sequence indicated, and by qualified personnel
only:
ƒ power up the boiler
ƒ set the parameters
306
minimum fan speed
307 maximum fan speed
308
slow ignition
309
maximum fan speed for heating
313
ignition speed in restart
METHANE GAS
MAX. FAN RPM
CH - DHW 7.000 - 8.700
25C :
CH - DHW 6.900 - 8.300
29C :
METHANE GAS
MIN. FAN RPM
25C
29C
FAN RPM
METHANE GAS
SLOW IGNITION
25C - 29C

5.23 GAS VALVE CALIBRATION

Run the CO check procedure as explained in paragraph
2
"5.21 Combustion analysis". If the values need to be modified,
proceed as follows:
ƒ check the CO adjustment values with the casing closed
2
ƒ remove the casing as explained in paragraph "4.6 CASING
REMOVAL"
ƒ check the CO adjustment values again, with the casing open
2
ƒ on the basis of the difference in values with the casing
closed and open, if necessary bring the CO
shown in the table (1 and 2) - (minus) the difference found.
Example:
ƒ CO value measured with the casing closed = 8,5%
2
ƒ CO value measured with the casing open = 8,3%
2
ƒ value to be set for CO
ƒ value to be set for CO
.
6 0 5
exit function
LPG
(G20) (G31)
6.900 - 8.500
6.800 - 7.900
LPG
(G20) (G31)
1.500 2.050
1.500 1.700
LPG
(G20) (G31)
5.500 5.500
to the value
2
with the casing open = 8,8%
2
with the casing closed = 9,0%
2
ƒ to adjust the CO
ƒ rotate the max. power adjustment screw clockwise to redu-
ce the value, or anti-clockwise to increase it
ƒ rotate the min. power adjustment screw clockwise to incre-
ase the value, or anti-clockwise to reduce it
ƒ with the casing open and after adjusting the CO
minimum power, check the adjustment of the CO
ximum power again
ƒ after completing the adjustments, replace the casing and
check the CO corresponds to the value shown in the table
2
1 and 2.
CO +
2
Minimum output
adjustment
screw

5.24 RANGE RATED

This boiler can be adapted to the heating requirements of the
system:
ƒ power up the boiler
ƒ set the parameter
310
Range rated
ƒ Set the heating value required (see chart) (rpm) and
confirm.
.
7 0 0
Record the new set value in the table on the back cover of
this manual. For subsequent controls and adjustments, refer
to the set value.
b
The calibration does not entail the ignition of the boiler.
The boiler is supplied with the adjustments shown in the
technical data table. Depending on requirements however,
this value can be modified by referring to the graph below.
rpm
9500
9000
rpm
8500
8000
7500
7000
6500
6000
25C
5500
rpm
5000
4500
rpm
4000
3500
3000
2500
2000
1500
1000
500
rpm
0
0 2 4 6
5.25 FAULTS AND REPORTING
If there is a fault, an error code "Axx" is shown on the display.
In certain cases, the error code is accompanied by an icon:
FAULTS
flame failure A10
all faults except flame failure and
water pressure
water pressure
value:
2
CO -
2
Maximum output
adjustment screw
MAX
rpm
7 0 0
confirm
Heat input curve - fan rotation
8 10 12 14 16 18 20 22 24
Heat input (kW)
ICONS DISPLAYED
value at the
2
at the ma-
2
.
30C
26 28 30 32
27