26
10.1. PARAMETERS SETTING “OPERATION WITH "PUFFER" OR COMBO PUFFER”
PARAMETERS TO BE SET
Modifying or incorrectly setting these parameters may cause boiler malfunction and in consequence
problems on the whole system. We recommend having the boiler fired for the first time only by technical
skilled personnel or by an authorized service center.
10.2. PARAMETERS SETTING “OPERATION WITH PUFFER OR COMBO PUFFER”
0. Working boiler temperature: it means the temperature at which the boiler will enter standby mode.
When the set temperature is reached, the electronic control turns OFF the fan. The fan will start
again when the water temperature falls below 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 in the parameter “Standby delay time”, the boiler will re-
enter standby mode.
1. Minimum
boiler
temperature: The minimum boiler temperature is the value under which the external
tank circuit pump is stopped to avoid condensate formation issues. 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 stop producing an ALARM sound. In
this case the electronic control board starts the system pump and the bypass pump to dissipate the
excess heat. If the temperature reaches 104 °C the manual reset security thermostat opens the
supply circuit to the fan stopping it until it is will be manually rearmed.
NOTE: if the boiler temperature reaches often the maximum allowed value, check that the air suction
port gravitational closing disc is closed when the boiler reaches the "working boiler temperature", or
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 enter the hot water preparation priority
mode, but this is to be considered only with a combo type external tank instead of a "puffer" (heat
accumulator tank). NOTE: it is important to know that when the combo type external tank or the
"puffer" has a temperature greater than the "Minimum external tank temperature" value, in the event
of heat request by the room thermostat the heating system pump will be started.
4. Maximum working hot water tank temperature: if in hot water preparation priority mode, when the S2
probe detects a temperature greater than this parameter value, the electronic control board cancels
the hot water preparation priority mode displaying back the heating message.
5. Temperature differential in heating mode: to avoid too many fan ON/OFF cycles in a short time as
the boiler reaches working temperature, this parameter establishes 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
55°C
4 Maximum hot water tank temperature
65°C
5 Temperature difference in heating mode
1.0°C
6 Temperature difference in hot water preparing mode
2.0°C
7 Temperature difference in solar panel heating mode
6.0°C
8 Maximum boiler body temperature difference
2.0°C
9 Boiler delay time in Stand by
50 min.
10: Function parameter #1:
Probe activation and deactivation.
30 (puffer)
31 (ext. combo tank
and solar panels)
11 Function parameter #2:
Boiler and accessories setting.
12 (puffer)
13 (ext. combo tank
and solar panels)
12 DISPLAY LANGUAGE SELECTION. 00
(italian)
