Dhw Comfort" Function; Special Dhw Functions; Screed Heater Function; Combustion Analysis - Beretta Ciao 25C Installer And User Manual

PARALLEL NIGHT TIME REDUCTION
RIDUZIONE NOTTURNA PARALLELA
90
80
70
DAY TEMPERATURE
Curva climatica GIORNO
CURVE
60
50
40
30
20
10
20 15 10
external temperature (°C)
Temperatura esterna (°C)
In this case too, the user can indirectly modify the HEATING setpoint value by
defining an offset on the reference DAY temperature (20°C) or the reference
NIGHT temperature (16°C) that can vary within the range [-5 to +5].
NIGHT COMPENSATION is not available if OT+ chrono is connected.
For the correction of the offset, refer to paragraph "6.2 Setting the heating
setpoint ".
3.5

"DHW comfort" function

1
P H O
+
>2 sec
2
P H 1
3
P H 3
Function Scrolling message
PH0 NO function active
PH1 PRE-HEATING function active
PH2 TOUCH & GO function active
PH3 SMART PRE-HEATING function active
PH1 PRE-HEATING function
Set PH1 to activate the DHW pre-heating function on the boiler. This function
keeps the water in the domestic hot water exchanger hot, to reduce standby
times when a request is made. The function is not active when the boiler is OFF.
PH2 TOUCH & GO function
If you do not want to keep PRE-HEATING permanently active, and you want hot
water immediately ready, the domestic hot water can be pre-heated just a few
moments before meeting the request.
This function allows you, by opening and closing the tap, to activate the instanta-
neous pre-heating that prepares the hot water for that request only.
PH3 SMART PRE-HEATING function
When this function is active, post-circulation for the end of the heating request is
enabled with the three-way valve positioned on DHW until one of the following
conditions is met:
- DT (delivery - return probe) < 2 °C
- Post-circulation duration > 20 sec
- Return temperature > 65 °C
3.6

Special DHW functions

Parameter 511 is used to activate special functions during the modulation phase
in DHW mode. These functions improve the boiler performance in particularly
hard operating conditions (such as very high inlet water temperatures, very low
flow rates, use in combination with solar storage tanks).
0 No special function active (default value)
Application of a flow switch/flowmeter start-up delay (parameter
1
510 - SERVICE)
In the event of switch-off due to overtemperature in DHW mode
2 (with a request in progress), the fan is kept at switch-on speed to
reduce the restart standby time
3 Absolute DHW thermostats
4 Smart DHW anti-oscillation function
5 All four previous functions active
NIGHT TEMPERATURE
Curva climatica NOTTE
CURVE
5 0 -5 -10 -15 -20
P HO
P H 1
P H2
P H3
DHW DELAY function (1)
Activate this function to enable a delay, equal to the set value of the parameter,
on the activation of the pump and fan when a DHW request is received.
SMART-FAN function (2)
If this function is activated, the fan is kept at the minimum speed (MIN) and is not
switched off if the burner is OFF due to DHW overtemperature (with a request
still active).
ABSOLUTE THERMOSTATS function (3)
If this function is activated, the DHW thermostats for burner ON/OFF switch
from the relative value to the absolute one.
ANTI-OSCILLATION function (4)
If this function is activated, the boiler self-configures to ABSOLUTE THERMO-
STATS if the burner is OFF due to DHW overtemperature (with a request in
progress). When the burner is OFF, the fan is kept at the minimum speed. The
thermostats go back to being "correlated" at the end of the request.
3.7

Screed heater function

With the system at a low temperature, the "screed heater" function enables a
heating request with a delivery setpoint of 20°C in the initial zone. This value is
then gradually increased as shown in the table below.
DAY TIME
1
2
3
4
5
6
7
This function lasts 168 hours (7 days).
To activate the screed heater function:
ƒ set the boiler to OFF (because this function is only available in this mode)
ƒ set 409 =1. The display will show
---
Once activated, this function takes maximum priority. If there is a power failure
and reset, the function will resume from the point where it was interrupted.
The screed heater function can be disabled by bringing the boiler to a condition
other than OFF, or by setting 409 = 0.
b
NB: The temperature and increase values can be set to different values
only by qualified personnel, only if strictly necessary. The manufacturer
declines all responsibility if the parameters are incorrectly set.
In item I001 of the INFO menu, you can see the number of hours that have
elapsed since the function was activated.
3.8

Combustion analysis

b
Checks to verify the adjustments of the CO
reference parameters (given in the tables below) must be carried out
with the casing closed. If the casing is opened, the values will have to be
reduced by about 0.2% depending on the installation configuration (the
type and length of the discharge and suction pipes).
Combustion control sequence
1
---
2
3
10
TEMPERATURE
0 20°C
6 22°C
12 24°C
18 26°C
0 28°C
12 30°C
0 32°C
0 35°C
0 35°C
0 30°C
0 25°C
R c S
values in relation to the
2
4
5