For more information, see
Connection diagram: Boilers in c 1 direct c 1
underfloor heating c 1 domestic hot water tank, page 34
Configuring boilers in c 1 direct c 1 underfloor
heating c 1 domestic hot water tank, page 66
6.7.11 Connecting boilers in cascade with a OCI 345 module
Connect the boilers included in the boiler cascade with OCI 345 modules
(electronic devices that handle communication through a BUS link). The
OCI 345 modules must be connected to each boiler with three connectors.
Tab.24 Connecting the boiler components in cascade
Component 1
Component 2
OCI 345 module on the boiler
X30 connector on the boiler PCB. (Flat cable supplied with the
OCI 345 module)
MB connector of a OCI 345 module
MB connector of a boiler OCI 345 module
DB connector of a OCI 345 module
DB connector of a boiler OCI 345 module
To make the connections between the various MB and DB connectors,
use a shielded cable with the following specifications:
Type
Cross section
Maximum length
HAR H05 VV-F
2 x 1.5 mm
2
200 m
6.8
Filling the installation
6.8.1
Filling the heating system
Before filling the heating system, rinse it thoroughly.
In many cases, the heating circuits can be filled with mains water, without
treating the water.
1. Fill the heating system until you reach a pressure of between 0.15 and
0.2 MPa (1.5 and 2 bar).
2. Check the tightness of the hydraulic connections.
3. Completely vent the heating circuit for optimum running.
For more information, see
Flushing new installations and installations less than 6 months
old
1. Clean the installation with a powerful universal cleaner to eliminate
debris from the system (copper, hemp, flux).
2. Thoroughly flush the installation until the water runs clear and shows
no impurities.
For more information, see
Fig.64
Connecting OCI 345 modules for
boilers in cascade
MW-3000042
DB.MB
DB.MB
DB.MB
6 Installation
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