17
Figure 21
6 .4 Cascade installation
6 .4 .1 Connection to mains
Each module (boiler) must be electrically powered. The
connection must be made in accordance with current reg-
ulations regarding electrical safety, using a multi sheathed
cable H05 VV-F-3GI with minimum section of the conduc-
tors of 1,5 mm
2
, properly protected against humidity, abra-
sions and accidental contacts.
The electric connection has to be made for each module as
described in paragraph 6.2.1.
6 .4 .2 Serial Connection (BUS)
All battery equipments need to be connect to each other
via bus. Use a H05-VV-F-3GI sheathed cable (not includ-
ed) to make the connection. The minimum section size of
the cable conductors needs to be of 0,5 mm
2
(with ade-
quate length). Use the jigs placed inside the boards rack
to connect the equipments in a battery (see Figure 12 and
Please note that the BUS connection is not poled hence it
is not needed to respect the same polarity on the connec-
tions.
Employ the rubber cable runner to make the cables go
from one equipment to the other (see Figure 22.
b
The rubber cableguides placed on the structure of
the equipment have not to be removed because
their purpose is to protect the cables from wear that
occurs in direct contact between cable and frame
equipment. To pass a cable is sufficient to drill the
cableguides.
Once the connection has been made, all the unit of the
battery will be as follows:
- electrically powered;
- connected to each other through a serial wiring;
- connected to the probes, to the pump and to the
master board.
In order to complete the electric installation, select address
for each slave as show in the paragraph for “slaves boards
settings” (see par 7.1).
Figure 22
6 .5 Position of the flow probe
Each unit upper water manifold is equipped with two pock-
ets where the temperature probe has to be inserted. The
latter probe continuously checks the flow temperature of
the heating circuit.
Either you are installing a single unit or a battery of them,
the flow probe must always be installed inside the pocket
placed downstream.
Of course, in case of more than one unit in battery, the
probe must be inserted in the pocket placed downstream
on the unit closer to the system inlet, as it is shown in Figure
The temperature difference read by the probe causes ig-
nition, switching off and modulation of all the thermal el-
ements in cascade. Installer shall take care to place the
probe inside the pocket which is closer to the system inlet,
in accordance to the water stream.
Figure 23
Summary of Contents for Power Plus Box 1002 P INT
Page 1: ...Installation Manual CONDENSING Power Plus Box 1002 1003 1004 P INT EXT Installation Manual EN...
Page 36: ...36 12 WIRING DIAGRAMS...
Page 37: ...37 Valvola 2 vie Circolatore...
Page 42: ...42...
Page 43: ...43...
