22
9.1. PARAMETERS SETTING “HEATING AND HOT WATER PRODUCTION BY
MEANS OF AN EXTERNAL TANK”
FUNCTIONAL PARAMETERS TO BE SET
Modifying these parameters or setting wrong values may cause boiler malfunctions and in consequence
problems in the whole system. We recommend having the boiler fired for the first time only by technical
skilled personnel or by an authorized service center.
9.2. PARAMETER SETTING “HEATING AND HOT WATER PRODUCTION WITH AN
EXTERNAL TANK”
0. Working boiler temperature: the temperature at which the boiler will enter the standby mode. When
the set temperature is reached, the electronic control turns OFF the fan. The fan will be started again
when the water temperature falls under the “temperature difference in heating mode” (usually 2 °C)
plus another hysteresis degree.
Example: “Working boiler temperature”= 80°C - (2+1)= 77°C; therefore, when the system pump or
the hot water tank pump are stopped, if the boiler temperature falls below 77 °C and the temperature
of 80 °C is not reached within the time set by the parameter “Standby delay time”, the boiler will enter
the standby mode.
1. Minimum boiler temperature: the value under which the pumps are stopped to avoid condensation
problems. At the same time, if the boiler remains under this temperature for the time “Standby delay
time”, the boiler returns to standby mode.
2. Maximum allowed temperature in thermal inertial mode: the maximum temperature allowed for the
boiler; if the temperature is greater than this value, the boiler will start producing an ALARM sound.
In this case the electronic control board starts the system pump, the tank pump and the bypass pump
to dissipate excess heat. If the temperature reaches 104 °C the manual reset security thermostat
opens the supply circuit to the fan stopping it until it will be rearmed.
NOTE: if the boiler temperature often reaches the maximum allowed value, control that the air
suction port gravitational closing disc is closed when the boiler reaches the "working boiler
temperature", or check for bad door closing or damaged door gaskets.
3. Minimum external tank temperature: sets the minimum tank temperature under which, if the “AUT”
(automatic) function is set, the external tank heating cycle is started, then if S3 probe detects a
temperature value less than this parameter value the boiler enters the hot water preparation priority
mode.
4. Maximum working hot water tank temperature: if in hot water preparation priority mode, when the S3
probe detects a temperature greater than this parameter value, the electronic control board cancels
the hot water preparation priority mode restarting the heating circuit pump.
5. Temperature differential in heating mode: to avoid too much fan ON/OFF cycles in a short time as
the boiler reaches working temperature, this parameter fixes a minimum fan OFF time.
Parameter description
RECOMMENDED Setting
0 Boiler operating temperature
80°C
1 Boiler minimum temperature
65°C
2 Maximum boiler temperature in thermal inertial
phase
88°C
3 Minimum hot water tank temperature
45°C
4 Maximum hot water tank temperature
65°C
5 Temperature difference in heating mode
2.0°C
6 Temperature difference in hot water preparing mode
5.0°C
7 Temperature difference in solar panel heating mode
6.0°C
8 Maximum boiler body temperature difference
4.0°C
9 Boiler delay time in Stand by
50 min.
10: Function parameter #1:
Probes activation and deactivation.
28 (ext. tank)
30 (ext. tank and solar
panels)
11 Function parameter #2:
Boiler and accessories setting.
4 (ext. tank)
5 (ext. tank and solar
panels)
12 DISPLAY LANGUAGE SELECTION. 00
(italian)
