29
SETTING FUNCTIONING PARAMETERS
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.
Low load
The low load function prevents burner ignition and shut off in
the case of a low heat demand. The conditions for low load op-
eration activation is controlled in every Slave card that sends the
function activation request to the Master.
During normal operation, the setpoint of the active circuit (high
or low temperature circuit setpoint or DHW setpoint) is sent to
the Slave cards and is controlled by the temperature of the heat-
ing element by every Slave card:
if the modular system temperature > Setpoint – 8°C or
if the modular system temperature > 85°C - 8°C
consent for starting the burner is not given.
If the Slave board acquires a modular system temperature great-
er than 85°C for 3 times with the burner ignited, the heating el-
ement is turned off and the ignition procedure is started again.
Emergency function
In the case of a Master card fault, there are two methods for
manually controlling the Slave cards:
− With eBUS and with the manifold sensor
Disconnect the power supply from the system,
disconnect the BUS. Set the address 000000 on all slave
cards (J10 and J17 OFF). Connect a power supply between
21 and 28 Vac to the BUS.
If the manifold temperature < Temp.Emergency (Par.40;
preset 70°C; can be set between 10 and 80°C) all the
burners will operate at maximum power.
If the manifold temperature > Temp.Eme 5°C all
burners are off.
− With PC
Disconnect the system power supply, disconnect the BUS
and connect the PC interface. The burner power can be
sent to the Slave card directly with the PC.
9
In the case of error, contact Technical Assistance Service.
Heat demand management for the high temperature circuit
with analogue input (Par. 14=2 or 3)
The room thermostat for the high temperature circuit is ignored
in the case of heat demand and the input signal is used for cal-
culating the system setpoint temperature or power.
The analogue input (see terminals 13-14 on the wiring diagram
on page 35) is only for the Master card and can also be used for
the low temperature circuit (Par.22). The analogue input cannot
be used for both circuits.
ANALOGUE POWER INPUT, Par. 14=2 (Par. 22=2 for low tempera-
ture circuits)
The following rules apply to high temperature (low temperature)
circuit demand:
0-2Vdc:
no demand by the high temperature (low
temperature) circuit
2-9Vdc:
the heat demand is converted into a power demand
for each Slave. A 2V input corresponds to minimum
power, 9V to maximum power (Par.15). The power is
calculated linearly between 2V and 9V. Hysteresis for the
end of demand is 0.2V and therefore demand is present
above 2V and stops below 1.8V.
Summary of Contents for Condexa Pro3 230 IN V02
Page 1: ...cod 20060249 rev 10 12 2015 Condexa Pro3 230 345 460 IN EXT EN INSTALLATION INSTRUCTIONS...
Page 36: ...36 WIRING DIAGRAMS 12 WIRING DIAGRAMS...
Page 37: ...37 WIRING DIAGRAMS Valvola 2 vie Circolatore...
Page 42: ...42 WATER IN CENTRAL HEATING SYSTEMS...
