Screed Heater Function; Combustion Analysis - Beretta CIAO X 25C MTN Installer And User Manual

Function Scrolling message
PH0 NO function active
PH1 PRE-HEATING function active
PH2 TOUCH & GO function active
PH3 PRE-HEATING SMART 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
instantaneous pre-heating that prepares the hot water for that request
only.
PH3 PRE-HEATING SMART 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
4.6 DHW special functions
Parameter 511 is used to activate special functions during the modu-
lation phase in DHW mode. These functions improve the boiler perfor-
mance 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 the minimum speed
(MIN) to reduce the restart standby time
3 Absolute DHW thermostats
4 Smart DHW anti-oscillation function
5 All four previous functions active
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
THERMOSTATS 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.
4.7

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 0
6
12
18
2 0
12
3 0
4 0
5 0
6 0
7 0
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.
In item I001 of the INFO menu, you can see the number of hours that
have elapsed since the function was activated.
4.8
b
Combustion control sequence
The displayed value refers to the number of revolutions divided by 100.
ƒ Set the maximum rpm value
The boiler works at the maximum power level.
ƒ Check the analyser to ensure the max CO
TEMPERATURE
20°C
22°C
24°C
26°C
28°C
30°C
ƒ Set the minimum rpm value
32°C
35°C
35°C
30°C
25°C
The boiler works at the minimum power level.
11
---

Combustion analysis

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).
1
.
5 0 8
The probe for the fumes analysis must
be inserted until it reaches the stop
---
Co
+
> 2 sec
.
7 0 0
indication given in the table. If the value is different, calibrate the gas
valve - see paragraph "4.10 Gas valve calibration".
METHANE GAS
CO max
2
(G20)
25C 9,0
30C 9,0
.
1 0 5
R c S
values in relation to the
2
3
2
4
.
0 0 6
.
0 0 6
or
MAX
rpm
.
7 0 0
confirm
value complies with the
2
LPG
(G31)
10,0
10,0
.
1 0 5
MIN
rpm
confirm
EN
fan speed
in CH
MAX
MIN
%
%