Accessing The Electrical Connections; Connecting The Room Thermostat - Baxi 224 Combi 2 Installation And Service Manual

6 Installation
Fig.38 Accessing the circuit board
Fig.39 Adding wires to the PCB
Fig.40 Connecting wires to the PCB
N L
Fig.41 Connecting the room thermostat RT
40 Combi 2
6.4.1
To access the electrical connection board:
1 Pull the control panel downwards (1).
Lift the rear cover (2).
2
3
Release the four catches to remove the cover (3) (do not use
excessive force as this could break the plastic hooks).
Important
Do not use excessive force as this could break the plastic hooks.
To add one or more wires to the boiler wiring, proceed as follows:
Undo the screw (1) on the multiple cable gland (A) located on the
lower right-hand side of the boiler (the screw serves a cable gland);
Determine the correct diameter for the cable gland, then cut the
corresponding plug (2), as shown in the figure and feed the wire into
the hole;
Connect the wire then secure the cable gland in place by tightening
the screw (1).
The supply cable is connected to the terminal board as shown in the
figure below.
L: 230 V (brown wire)
N: Neutral (blue cable)
BO-7746442-5
6.4.2
Before connecting the room thermostat (RT) or Open Therm (OT)
device, remove the link wire on the terminal board as shown in figure 40.
Important
An ON/OFF room thermostat (also H.V. 230V) can be connected
to the RT connector.
On the OT connector it is possible to connect a low voltage or
Open therm, Rbus, room thermostat.
To use a H.V. thermostat remove the link between RT
connector and maintain the link on the OT connector.
If you want to use an OT thermostat remove the link between
OT connector and maintain the link on the RT connector.

Accessing the electrical connections

See
Section 10.3.1 Accessing the boiler components to remove the
front cover
: Earth connection:

Connecting the room thermostat