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2. 1 1.2 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. 3 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 modu-
le 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 col-
lectors with a clapet valve are used in sequence/cascade
installations:
PAR 1 =
6 (for NATURAL GAS boilers)
14 (for PROPANE boilers)
To access the INST parameters, see point 3.3.
In addition, when the number of connected boilers in cascade
is more than two, parameter OEM A1 of the MASTER boiler
must be configured as well.
To access the OEM parameters press simultaneously the but-
tons (
and
) for 2 seconds.
Having entered the INST level, press (
neously for another 2 seconds. At this point insert the access
code formed by this sequence of INSTALLATOR BUTTONS:
" + / - / < / > / < ".
Set the parameter:
PAR A1 =
Number of cascade generators (3 ... 8)
x 2
and
) simulta-
Fig. 11/a
47
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