Riello Start Aqua Condens 25/60 BIS, Installer And User Manual

Page: 31 / 76

ENGLISH
31
C
ombustion check
To carry out the combustion analysis, proceed as follows:
- Turn the mode selector to
to turn off the boiler
- Turn the DHW adjustment selector to the combustion analysis
mode position
- Wait for the burner to fire (approx. 6 seconds). “ACO” is displayed
and the boiler operates at the maximum heating output
- Remove the screw and the cover on the air distribution box (see
image below)
- Insert the flue gas analysis probe into the sockets provided on the
air box
- Check that the CO
2
values correspond to those indicated in the
"Technical data" table, if the value displayed is different, modify as
indicated in chapter "Gas valve calibration"
- Perform the combustion check.
Then:
- Remove the analyser probe and close the combustion analysis
sockets with the screw
The flue gas analysis probe should be inserted until its reaches
the stop.
Even during the combustion analysis phase, the function that
switches the boiler off when the water temperature reaches the
maximum limit (about 90°C) remains enabled.
When the checks are completed:
- Position the mode selector depending on the operating mode de-
sired
- Adjust the selectors according to the client's requirements.
The boiler is supplied for use with methane gas (G20) and are
already factory set as specified on the rating plate, so do not
require any calibration.
All checks must be carried out exclusively by the Technical As-
sistance Centre.
4.4 Setting the thermoregulation
Thermoregulation only works with external sensor connected, so once
installed, connect the outdoor probe - accessory on request - to the
appropriate connections provided on the terminal board of the boiler.
This enables the THERMOREGULATION function.
Choice of the compensation curve
The compensation curve for heating maintains a theoretical temper-
ature of 20°C indoors, when the external temperature is between
+20°C and -20°C. The choice of the curve depends on the minimum
external temperature envisaged (and therefore on the geographical
location), and on the delivery temperature envisaged (and therefore
on the type of system). It is carefully calculated by the installer on the
basis of the following formula:
KT = T.outlet envisaged - Tshift
20- min. design external T.
Tshift = 30°C standard system
25°C floor installations
If the calculation produces an intermediate value between two
curves, you are advised to choose the compensation curve nearest
the value obtained.
Example: if the value obtained from the calculation is 1.3, this is be-
tween curve 1 and curve 1.5. Choose the nearest curve, i.e. 1.5.
Selection of the KT must be made by acting on the P3 trimmer on the
card (see multi-wire electrical diagram).
To access P3:
- Remove the housing
- Turn the instrument panel forward
- Undo the fixing screws of the terminal board cover
- Unhook the board cover.
Live electrical parts (230 Vac).
The settable KT values are as follows:
- standard system: 1.0-1.5-2.0-2.5-3.0
- floor installation 0.2-0.4-0.6-0.8
and appear on the display for a duration of about three seconds after
the rotation of trimmer P3.
TYPE OF HEAT REQUEST
If an ambient thermostat is connected to the boiler
(Jumper 6 not inserted)
The heat request is made by the closure of the room thermostat con-
tact, while the opening of the contact produces a switch-off. The de-
livery temperature is automatically calculated by the boiler, although
the user may interact with the boiler. Using the interface to modify the
HEATING, you will not have the HEATING SET-POINT value availa-
ble, but a value that you can set as preferred between 15 and 25°C.
The modification of this value will not directly modify the delivery tem-
perature, but will automatically affect the calculation that determines
the value of that temperature, altering the reference temperature in
the system (0 = 20°C).
If a programming timer is connected to the boiler
(JUMPER JP6 inserted)
With the contact closed, the heat request is made by the delivery
probe, on the basis of the external temperature, to obtain a nominal
ambient temperature on DAY level (20°C). The opening of the con-
tact does not produce a switch-off, but a reduction (parallel transla-
tion) of the climatic curve on NIGHT level (16°C).
This will activate the night time function.
cover
screw