First start-up
Installation, use and maintenance manual – Next-G
45
5
The CO
2
value should be checked with the thermo-
formed door closed, while the gas valve should be
adjusted with the thermoformed door open.
If a differential pressure gauge is used, it is neces-
sary to connect the pressure intake of the gas valve
to the + (positive) port of the pressure gauge.
Check that the static and dynamic supply gas
pressure values, with the gas unit heater running
at maximum power, correspond to what is shown
in Table 3.1
p. 29 (with low supply gas pressure
values the CO
2
value will also be at minimum
values).
The operation request for checking combustion
parameters is independent of any heating service
requests on the "HEAT." contact.
Table 5.1
p. 45 shows the messages that can appear on
the display while the chimney sweep function is running,
the relative meaning and the optional actions required.
Limit the time you use the chimney sweep function
to the minimum actually required.
The system automatically interrupts the chimney
sweep function 15 minutes after the last key on the
interface was pressed.
If the required CO
2
settings cannot be reached,
contact Robur.
Table 5.1
Display messages for chimney sweep function
Message
Meaning
Action
CS.LO / UAIt
Chimney sweep function is active at minimum capacity
and the flame is still not lit or lit at a different capacity than
required.
Wait.
CS.LO / _GO_
Chimney sweep function is active at minimum capacity and
the flame is lit at the required capacity.
Run CO
2
reading (minimum capacity).
CS.HI / UAIt
Chimney sweep function is active at maximum capacity
and the flame is still not lit or lit at a different capacity than
required.
Wait.
CS.HI / _GO_
Chimney sweep function is active at maximum capacity and
the flame is lit at the required capacity.
Run CO
2
reading (maximum capacity).
Err.
The appliance switched off due to a fault (Warning or Error).
It is not possible to reset any errors with the function active.
Deactivate the function by pressing the
key for 5 seconds and
then intervene according to the operating codes shown on the
display, while referring operative codes table. Once the problem is
resolved, reactivate the function.
Cod.x
(x = 0, 1, ..)
The appliance is temporarily running a special cycle that
requires specific control of the power that is not compatible
with the execution of the chimney sweep function.
In the rare event of one of these codes appearing, deactivate the
function by pressing the
key for 5 seconds and then contact
Robur.
5.2.1
All models except G 75 and G 90
Figure 5.1
1. If the appliance is not running, switch it on using the
applicable control system.
2. Open the thermoformed door.
3. Remove the cap over the offset adjustment screw (C)
of the gas valve.
4. Connect a pressure gauge to offset pressure intake (A),
after having first removed or loosed the sealing screw.
5. Press the
key on the user interface of the appliance
for 5 seconds to activate the chimney sweep function
at minimum power.
6. The display shows the letters "CS.LO" (chimney sweep
low power), alternating with the flashing message
"UAIt" (wait) which indicates that the machine is not
yet ready for the reading.
7. After up to 8 minutes the flashing message becomes
"_GO_" to indicate that the combustion control can be
carried out.
8. Ensure that the CO
2
value corresponds to the value
indicated in the "Minimal heat input" column of the
following Tables, according to the model and the gas
type used. Otherwise, set CO
2
percentage value using
the offset adjustment screw.
9. Disconnect the pressure gauge from the offset pres-
sure intake (A) and tighten its sealing screw.
10. Connect a pressure gauge to throttle pressure intake
(E), after having first removed or loosed the sealing
screw.
11. Press the
key on the user interface to activate the
chimney sweep function at maximum power.
12. The display shows the letters "CS.HI" (chimney sweep
high power), alternating once again with the flashing
message "UAIt" (wait) which indicates that the ma-
chine is not yet ready for the reading.
