18
8.1
BOILER PARAMETERS SETTING “HEATING ONLY MODE”
FUNCTIONAL PARAMETERS
Modifying these parameters or wrong values may cause boiler malfunctions and in consequence problems
on the whole system. We recommend to have the boiler fired for the first time only by technical skilled
personnel or by an authorized service center.
8.2. PARAMETERS SETTINGS “HEATING ONLY OPERATION”
0. Working boiler temperature: it means 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 down under 77 °C and the
temperature of 80 °C won't be reached within the time set in the parameter “Standby delay time”, the
boiler will enter back the standby mode.
1. Minimum boiler temperature: The minimum boiler temperature is that value under which the pumps
are stopped to avoid condensation issues. In the same time, if the boiler remains under this
temperature for the time “Standby delay time”, the boiler gets back in standby mode.
2. Maximum allowed temperature in thermal inertial mode: The maximum temperature allowed for the
boiler; if the temperature is more than this, 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
exceeding heat. If the temperature reaches 104 °C the manual reset security thermostat opens the
supply circuit to the fan stopping it until it won’t be rearmed.
NOTE: if the boiler temperature reaches frequently its maximum allowed value, check for a good
closing of the round air port door (not more than 2 mm air passage) when the boiler reaches its
working temperature, or for poor doors seal or for damaged doors gaskets.
3. Minimum hot water tank temperature: not used in this operation mode.
4. Maximum hot water tank temperature: not used in this operation mode.
5. Temperature differential in heating mode: Sets the system pump on/off hysteresis. If the minimum
boiler temperature is 60 °C and the differential is set to 2 °C, when the room thermostat calls for heat
(contacts 21-22 closed), the system pump starts at 62°C and stops at 61°C (hysteresis on all
parameters). Furthermore, the same parameter sets the drafting fan on/off temperature differential
(see parameter “Working boiler temperature”).
6. Hot water preparing temperature differential: not used in this operation mode.
7. Solar panels heating temperature differential: not used in this operation mode.
Parameter description
Recommended values
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 differential in heating mode
2.0°C
6
Temperature differential in hot water preparing mode
3.0°C
7
Temperature difference in solar panel heating mode
5.0°C
8
Maximum boiler body temperature difference
4.0°C
9
Boiler standby delay
50 min.
10: Function parameter #1:
Probes activation and deactivation.
24 (
heating only
)
11 Function parameter #2:
Boiler and accessories setting.
0 (
heating only
)
12 Language selection
00 (
italian
)
