A Operating Mode - Riello Vokera VISION PLUS 20 S User Instructions

Vent cycle
Whenever the electrical supply to the appliance has been
disrupted (OFF) and then restored (ON), it will enter a 4-min
vent cycle.
b
When the air purging cycle is in progress, all heat
requests are inhibited when the boiler is not set to OFF
and -AIR is displayed on the interface screen.
The display shows the message -AIR lighting up the icon
RESET.
The purge cycle can be interrupted early by keeping key 2 (the
icon RESET comes on).
ƒ Adjust the ambient temperature thermostat to the desired
temperature (~20°C) or, if the system is equipped with a
programmable thermostat or timer, ensure that the thermo-
stat or timer is "active" and set correctly (~20°C).
ƒ Then set the boiler on WINTER.
ƒ The boiler will start up and continue working until the set
temperatures are reached, after which it will then go back
to standby.

2.3A OPERATING MODE

For changing the operating status from WINTER to OFF press
key 1 until the icon for the desired function is displayed.
2.3.1A WINTER MODE
ƒ Set the boiler to the WINTER status by pressing key 1 until
the heating icon is displayed.
The interface normally displays the delivery temperature.
ƒ When there is a heat request and the burner is lit, the icon
appears on the display.
Heating REQUEST, the radiator icon blinks:
2.3.2A OFF
ƒ Set the boiler to the OFF status by pressing key 1 until the
central segments are displayed.
6
Bar
2.3.3A ADJUSTING THE HEATING WATER
TEMPERATURE WITHOUT AN OUTDOOR
TEMPERATURE SENSOR CONNECTED
If there is no outdoor temperature sensor the boiler operates
at a fixed point, the HEATING setpoint in this case can be set
on the main page of the screen.
The successive pressing of the key C or D on the main screen
displays the current value of the heating setpoint; the value
blinks with a frequency of 0.5 sec ON, 0.5 sec OFF and the
icons and come on.
+
RESET
The successive pressing of the key C or D allows you to set the
value of the heating setpoint within the preset range:
[40°C - 80.5°C] for high temperature systems
[20°C - 45 °C] for low temperature systems
with steps of 0.5°C. The level bars beside the heating icon
show the setpoint value set with respect to the operating range:
- four bars on = max setpoint
- one bar on = min setpoint
Keeping one of the two keys C or D pressed for longer, the
meter increases the speed of advancement modifying the set
value. If no key is pressed for 5sec, the value set is taken as
the new heating setpoint and the display returns to the main
page.
2.3.4A ADJUSTING THE HEATING WATER
TEMPERATURE WITH AN OUTDOOR
TEMPERATURE SENSOR CONNECTED
If an outdoor temperature sensor is installed and thermoregu-
lation is enabled (parameter P4.18=1), the delivery tempera-
ture is automatically selected by the system, which quickly
adjusts the ambient temperature according to the variations in
the outdoor temperature.
If you want to change the temperature, raising it or lowering it
with respect to that automatically calculated by the electronic
board, it is possible to change the HEATING setpoint selecting
the desired comfort level within the range (-5 - +5).
Note: if an outdoor temperature sensor is connected it is in
any event possible to have the boiler operate at a fixed point
by setting the parameter P4.18 = 0 (menu P4).
2.3.5A SAFETY STOP
If there are ignition faults or boiler operation malfunctions,
carry out a "SAFETY STOP". On the display, in addition to the
fault code, the icon is also displayed, which blinks with a
frequency of 0.5sec ON and 0.5sec OFF.
The backlight blinks for 1min after which it switches off, while
the icon continues blinking.
On the 4 digits a message scrolls containing the error code
and its description.
C
+
D
MENU