Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 67

Connecting the external electrical components
Information regarding the use of room temperature sensors and remote
controls
If a room temperature sensor is being installed for a heating circuit without a
remote control, the room temperature sensor must be connected as shown in
the illustration above.
If a remote control has been connected for a heating circuit, the room tem-
perature sensor for this heating circuit must be connected to the remote con-
trol.
If 2 remote controls have been connected, connection X60.29/X60.30 on the
control panel will be disabled.
Both the remote control units and the room temperature sensors must be acti-
vated independently (see control settings, pages 172 and 175).
Outside temperature sensor (type Ni 500)
A Terminals in the control panel
B Terminals at the outside tempera-
ture sensor
Temperature sensor (type Pt 500) in the heating water buffer cylinder
A Terminals in the control panel
B Buffer cylinder sensor
Installation sequence
(cont.)
Install the outside temperature sensor
on the north or north-west wall at a
height of approx. 2.5 m; never render
it over.
2
Lead: 2 x 1.5 mm , max. 35 m long,
copper.
Cores are interchangeable.
Earth can also be connected to term-
inals X60.28 or X60.30.
67