Important
Relay the pumps if the current exceeds 1 A max. per output.
6.3.3
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.17 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
6.3.4
Configuration for 1 master boiler and 1 slave boiler
1. Go to the installer parameters on boiler 1 (master boiler).
2. Set the following parameters on boiler 1:
Tab.18 Settings on boiler 1 (master boiler)
Parameter number
Parameter
Adjustment required
5710
Temps / mode CH1
On
5715
Temps / mode CH2
On
5721
Temps / mode CH3
Off
5730
Hot water sensor
Hot water sensor B3
5731
Sensor input BX2
Common flow sensor B10
5890
Relay output QX1
heating pump CH1 Q2
5892
Relay output QX3
Hot water ctrl elem Q3
5932
Sensor input BX3
Cascade return sensor B70
6020
Function extension module 1
Temps / mode CH2
6600
Device address
1
6640
Clock mode
Master
3. Go to the installer parameters on boiler 2 (slave boiler).
Fig.36
Connecting OCI 345 modules for
boilers in cascade
MW-3000042-2
DB.MB
DB.MB
DB.MB
6 Connecting diagrams and configuration
40
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