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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Electrical Connections
(continued)
Installation
Heating circuit - extension connection
Extra-low voltage printed circuit board connections
!
Outdoor temperature sensor
§
/
?
Common supply temperature sensor
%
A
Tank temperature sensor
%
B
Tank temperature sensor (bottom) in a tank loading
system (accessory)
aJ
B
Tank temperature sensor tank loading system
(accessory)
aVD
External connection
aVG
KM-BUS i.e. Extension EA1
(accessories)
aVH
External connection
FA
Burner control unit connected
Low voltage connections at the system and boiler section 1
controller
Legend
?
M2/M3 supply temperature sensor
Outdoor temperature sensor
Fitting location for outdoor temperature sensor
H
North or north-westerly wall, 6 to 8 ft (2 to 2.5 m)
above ground level; in multi storey buildings, in the
upper half of the second floor.
H
Not above windows, doors or ventilation outlets.
H
Not immediately below balconies or gutters.
H
Never paint over.
Outdoor temperature sensor connection
2 wire cable, 18 AWG for a maximum length of 115 ft.
(35 m).
Common supply temperature sensor
H
For single boilers systems, mount the common supply
temperature sensor on the supply piping near the boiler.
H
For multiboiler systems, mount the common supply
sensor on the supply piping common to all boilers.
Refer to the system layouts, see page 55.
X11
