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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Accessories Connection
Low voltage plug X3
! Outside temperature sensor:
H North or north-western wall, 6.5 ft. (2 m) to 8 ft.
(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 render over
H Cable length max. 115 ft. (35 m) with a cross-
section of 15 AWG (1.5 mm
2)
? Supply temperature sensor for low loss header
(accessories)
% DHW tank temperature sensor (factory installed)
aVG KM BUS participant (accessory)
H Vitotrol 200A or 300A remote control
H Vitocom 100
H Extension kit for one heating circuit with mixing
valve
H Extension EA1 or AM1
H Install a disconnect switch in the power supply line
that simultaneously isolates all live conductors from
the mains.
We additionally recommend installing a GFCI
receptacle switch.
H Max. fuse rating 15 A.
Legend
A Boiler control unit
B Extension kit for heating circuit with mixing valve M2
C Extension kit for heating circuit with mixing valve M3
D Extensions AM1 or EA1
E Accessory modules
Accessories Internal fuse protection
Extension kit for heating
circuit with mixing valve
2 A
Extension AM1 4 A
Extension EA1 2 A
Connection of accessories
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the safety level of
the accessory, the output concerned should only be used
to control an on-site relay.
Control Connections
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