24
ADJUSTING THE FUNCTIONAL PARAMETERS
tion_low) if the contact is open.
PERATION 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 /- 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
first 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, first 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)
System power modulation is controlled by a PID regulator, which
controls the manifold temperature and the setpoint is that of the
active circuit (high or low temperature circuit setpoint or DHW
setpoint). The PID has a direct influence on the last 2 burners
ignited, whereas the previous ones operate at maximum power.
If the manifold temperature < Setpoint – 5°C the next burner is
ignited and both are managed by the PID regulator.
The Master control unit waits for 30s and then
if the manifold temperature < Setpoint - 5°C, another burner is
ignited.
The first burner operates at maximum power, whereas the other
two are managed by the PID regulator.
If the manifold temperature > Se 2°C the last burner ig-
nited is shut off, the remaining last two burners are managed
by the PID regulator and the others operate at maximum power.
The Master control unit waits 30s before making another deci-
sion.
MODE: MAXIMUM QUANTITY OF BURNERS IGNITED (PAR.33=1)
All burners are controlled by the same PID regulator, which con-
trols the manifold temperature and the setpoint is that of the
active circuit (high or low temperature circuit setpoint or DHW
setpoint).
If the manifold temperature < Setpoint – 5°C the next burner is
ignited.
The Master control unit waits for 30s and then
if the manifold temperature < Setpoint - 5°C, another burner is
ignited.
If the manifold temperature > Se 2°C the last burner ig-
nited is shut off. The Master control unit waits 30s before making
another decision.
ADDITIONAL CASCADING MANAGEMENT FUNCTIONS
Sequential rotation of burner ignition
When supplying power to the Master control unit, the burner
with address 1 is the first in the sequence. After 24h, the first
burner will be the one with address 2, whereas the one with
address 1 will become the last in the sequence.
Ignition/shut off limitation
In both cascading strategies, after every ignition or shut off,
there is a minimum time during which the Master cannot ignite
or shut off burners.
Quick start-up and shut off
In both modes, there is a quick start-up and shut off function.
If the manifold temperature < Setpoint - 70°C
the burners are ignited at time intervals equal to 2s
If the manifold temperature > Se 4°C
the burners are shut off at time intervals equal to 2s.
