Setting The Main Parameters; Par.73 - Managing, Stand-Alone, Dependent Mode; Par.147 - No. Thermal Modules; Par.7 - Heating Setpoint Hysteresis - Riello Condexa PRO Series Installation, Technical And Maintenance Manual

COMMISSIONING AND MAINTENANCE
6.3.2

Setting the main parameters

Some parameters are essential in order for the system to operate
in cascade and setting these parameters is a determining factor
for correct system operation.
6.3.3 Par.73 – Managing, Stand-alone,
Dependent mode.
Parameter 73 defines how the thermal module is addressed and
serves to ensure that the signal from the secondary sensor is
recognised.
Three values can be set:
− Managing: to be set on the Managing module so that
secondary sensor operation is activated.
N.B.: The secondary sensor SC must be connected to the
2nd burner (1st Depending module);
− Stand Alone: to be set on the Managing module so that
secondary sensor operation is deactivated;
− 2 ÷ 7 to be set on all Depending modules.
Home/Menu
Settings Boiler Settings
screen
6.3.4 Par.147 – No. thermal modules
Parameter 147 defines the number of thermal modules in the
system (it is important to set the numer of connected modules
for the system to work properly). This parameter must only be
set on the "Managing" module.
Home/Menu
Settings Boiler Settings
screen
6.3.5 Par.7 – heating setpoint hysteresis
The parameter 7 adjust shutdown of the individual modules
when the setpoint is exceeded. With cascade operation, this
value must be increased (up to a maximum of 20°C) to prevent
module operation from being disabled (since the default value
is 5°C) if the system decides to increase the setpoint based on
the value read on the primary or secondary sensor (see expla-
nation in paragraphs "General operation", "Operation with the
primary sensor" and "Operation with the secondary sensor")
This parameter is to be modified (in the same way) on all mod-
ules of the cascade (Managing module and all the relative De-
pending modules).
Home/Menu
Settings Boiler Settings
screen
Boiler Cascade (73) Stand
Settings Alone Boiler
Cascade (147) Number
Module Config. of Units
(7)
Parameters
Heat Hyst. Up
80
6.3.6 Par.97 – definition of the system with
circulator / system with two-way valve
The parameter 97 serves to quickly configure the inputs and
outputs on the board of each module in order to adapt oper-
ation if a circulator is present or if a two-way valve is present.
This parameter must be configured correctly on both the De-
pending modules and the Managing module.
The parameter 97 must be set to 1 if system 1 or 2 is being used
(characterised by the use of the thermal module circulator),
while it must be set to 2 if system 3-4 is being used (character-
ised by the use of the two-way valve).
Home/Menu
Settings Boiler Settings
screen
6.3.7

General operation

With cascade operation, the regulator of the managing mod-
ule establishes a setpoint to be sent to the depending modules
based on the parameters 86-87, the difference between the
setpoint value set and the value read on the primary delivery
manifold (or on the basis of par 176-177 and the difference be-
tween the setpoint value set and the value read on the second-
ary delivery manifold).
On the basis of the setpoint received from the Managing mod-
ule, each module modulates based on its own PID (Par 16, Par 17
and Par 18) as a function of the difference between the setpoint
(sent by the Managing module) and the value read by the deliv-
ery sensor on the module itself.
9
The PID is a Proportional-Integral-Derivative control system
(abbreviated to PID) with retro-action. By reading an input
value which determines the current value, it is able to re-
act in the event of a positive or negative error (difference
between the current value and the target value), tending
towards 0. Reaction to the error can be regulated through
the terms "proportional, integral, derivative".

6.4 Operation with the primary sensor

The system sensor present on the primary system (see block di-
agrams 1 and 3) allows the setpoint sent to the individual mod-
ules to be modulated on the basis of the difference between
the setpoint and the value read on the delivery manifold of the
primary system.
The following parameters regulate this modulation:
79 defines the maximum setpoint decrease
80 defines the maximum setpoint increase
81 defines the time (from the start of the request) from
which the setpoint modulation is started
86 proportional parameter for setpoint modulation
87 integrative parameter for setpoint modulation

6.5 Operation with the secondary sensor

When the secondary system is present (see block diagrams 2 and
4), the setpoint sent to the individual modules to be modulat-
ed on the basis of the difference between the setpoint and the
value read on the delivery manifold of the secondary system.
In the same way that modulation is based on the system sensor,
the following parameters intervene:
169 defines the maximum setpoint decrease
170 defines the maximum setpoint increase
(97)
Parameters
Model