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2.11.2 Electrical connection of modules in sequence/cascade (fig. 11/a)
KEY
L.
Line
N.
Neutral
TS.
Safety.thermostat.100°C
Pmin.
Water.pressure.switch.min..0.9.bar
Pmax.
Water.pressure.switch.max..5.bar
SE.
External.sensor
SMC.
Cascade.supply.probe
RS-485. Cascade.management.board
NOTICE: The external temperature probe (SE) must be connected to the
MASTER boiler and the cascade supply probe (SMC) to the SLAVE 1 boiler.
The SE, SMC probes and the RS-485 board connection cable are supplied
together with the modules in the probe kit code 8092250.
The RS-485 board for management in sequence/cascade
is placed at the rear of the control panel of each individual
module as shown in the figure.
CONFIGURATION OF CASCADE PARAMETERS
Sequence/cascade installations must have the following
INST parameter set on all connected boilers:
PAR 15 =
0 for the first boiler (MASTER)
1 .... 7 for the other boilers (SLAVE)
(Avoid assigning the same number to SLAVE
boilers)
Set the following INST parameter if polypropylene smoke
collectors with a clapet valve are used in sequence/cascade
installations:
PAR 1 =
8 (for NATURAL GAS boilers)
16 (for PROPANE boilers)
To access the INST parameters, see point 3.3.
In addition, when the number of connected boilers in casca-
5
5
de is more than two, parameter OEM A1 of the MASTER boi-
ler must be configured as well.
To access the OEM parameters press simultaneously the
3
buttons (
and
) for 2 seconds.
Having entered the INST level, press (
1
1
neously for another 2 seconds. At this point insert the access
code formed by this sequence of INSTALLATOR BUTTONS:
" + / - / < / > / < ".
2
2
Set the parameter:
PAR A1 =
Number of cascade generators (3 ... 8)
4
x 2
5
5
3
3
and
) simulta-
1
1
2
2
4
4
ES
ENG
CH
POL
CN10
3
4
Fig..11/a
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