Description Of The Sensor Terminal Block; Connecting Boilers In Cascade With A Oci 345 Module - Baxi POWER HT+ Series Installation, User And Service Manual

7 Installation
3 Power supply auxiliary circuit 2
4 Room thermostat
5 Heating circuit pump
Important
Terminals 5, 6 and 7 are associated with the parameters QX1, QX2 and QX3 in the Configuration menu
Fig.84
1 Auxiliary sensor 1 - BX3: flow sensor + cascade
return connection
2 Auxiliary sensor 2 - BX2: heating circuits collector
flow sensor connection
3 Outside sensor
62 POWER HT +
2
1 3
2
1
6 Domestic hot water pump
7 Safety contact
8 Boiler pump
Caution
All connections are made to the terminal blocks provided for that
purpose in the boiler connection box. The output available per
outlet is 180 W (1 A, with cos ϕ = 0.8) and the inrush current must
be less that 5 A. If the load exceeds either of these values, the
control must be relayed using a contactor that must not be
installed in the control panel under any circumstances.
The sum of the currents from all outlets must not exceed 6.3 A.
7.6.5

Description of the sensor terminal block

4
5
3 2 1
1
4 Domestic hot water sensor - BX1
5 Room temperature sensor 1
6 Room temperature sensor 2
7 Room temperature sensor 3
8 Boiler pump modulation (PWM)
7.6.6

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.
6
8
7
3 2 1 2 1
2 / 3
MW-1000016-05
7702630 - v02 - 11082018