28
SETTING FUNCTIONING PARAMETERS
The burner is on when:
Manifold temperature <=Setpoint – ignition hysteresis.
Ignition hysteresis can be set, CH_Low_hyst_on = Par. 26, preset
to 5°C, can be set between 0 and 20°C.
The Master control unit converts the heat demand into power
demand for each slave control unit.
The burners are off when:
Manifold temperature >=Setpoint + shut-off hysteresis .
Shut-off hysteresis can be set (CH_Low_Hyst_off=Par. 27, preset
to 3, can be set between 0 and 20°C).
With the low temperature circuit attenuation parameter, Par.
25≠0, the low temperature thermostat contact is ignored and a
heat demand is present for the low temperature circuit when:
Manifold temperature <=Setpoint – ignition hysteresis
The heat demand stops when:
Manifold temperature >=Setpoint + shut-off hysteresis .
The setpoint in this case coincides with the value set for param-
eter 3 (Setpoint_t_ch_low) if the low temperature thermostat
contact is closed, whereas it is calculated as the value set for
parameter 3 less the attenuation (Setpoint_t_ch_low-Attenua-
tion_low) if the contact is open.
OPERATION WITH CLIMATIC CONTROL, PAR. 22=1
If the low temperature circuit attenuation is equal to 0 , Atten-
uation_low=Par. 25=0, its behaviour is the same as the previous
paragraph, with the exception that the setpoint is calculated
based on the outdoor temperature.
If the outdoor temperature = Tout_min=Par. 37, preset to 0°C,
then setpoint =setpoint_T_Ch_low.
If the outdoor temperature = Tout_max=Par. 38, preset to 18°C,
then setpoint T_ch_high_ foot=Par. 24, preset to 50°C.
The setpoint is calculated linearly between the 2 outdoor tem-
perature values.
Preset to 0.
3 T_out_correct
Outdoor temperature correction (parameter 39)
Normally, the displayed value is the value read by the microcon-
troller plus or minus a correction value (T_visualizzata = T read by
the sensor +/- correction).
The read value of the outdoor temperature can be corrected by
varying the value of parameter 39, (the permitted limit for the
correction is +/- 30 °C). In this phase, it is suggested to use a
reference thermometer.
Preset to 0.
4 Summer Mode
Summer function (parameter 38.)
The Summer Mode function is used to deactivate requests re-
ceived by the High Temperature and Low Temperature circuits
and from the zones when the outside temperature, T outside, is
equal to or above the value set in parameter 38.
The Parameter 38. can be set with values between 0 and 30 [°C].
Preset to 0 (summer function disabled).
5 T4_frost_protection
Antifreeze protection (parameter 35)
The electronic control unit has active antifreeze protection also
in stand-by mode. The antifreeze protection has two levels, the
rst that activates the pump and the second that activates the
pump and the burner.
If the manifold temperature ≤ 5°C, the high temperature circuit
pump and the system pump (third pump) are active
or, with CH_type=1 and outdoor sensor connected,
if the outdoor temperature ≤ 3°C (par. 35) the high temperature
pump and the system pump (third pump) are active
If after 10’ the manifold temperature ≤ 5°C
a burner is on at maximum until the manifold temperature ≥
20°C.
If after 10’ the manifold temperature ≥ 5°C but, with CH_type=1
(Par. 14 or 22) and outdoor sensor connected, the outdoor tem-
perature ≤ 3°C (par. 35) the pump continues to operate until the
outdoor temperature ≥ 3°C. Parameter 35 can be set between
-30°C and 15°C.
Preset to 3.
6 Power_control_mode
Cascading management (parameter 33)
To manage the power delivered by the system, two cascading
strategies are possible. In both cases, the Master control unit can
only add a new burner when another is on.
If the Master control unit must increase the number of ignited
burners, rst check that the next burner can be ignited: no er-
rors present and modular system temperature below the max-
imum. Otherwise, check another burner. If no burner is ready
for ignition, the master will decrease the number of burners to
ignite.
MODE: MINIMUM QUANTITY OF BURNERS IGNITED (PAR. 33=0)
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