Viessmann VITODENS 100-W Installation And Service Instructions Manual page 16

Installation sequence
Electrical connections
Separate installation
instructions
■ On-site room temperature con-
troller
■ Input for Y-plan or S-plan heating
systems
Remove jumper E (1 - L) when
connecting a 230 V control, leaving
the capacitor in place.
Outside temperature sensor (accessory)
1. Fit outside temperature sensor.
Installation site:
■ North or north-westerly wall, 2 to
2.5 m above ground level; in multi
storey buildings, in the upper half of
the second floor
■ Not above windows, doors or ven-
tilation outlets
■ Not immediately below balconies
or gutters
■ Never render over
■ Connection:
2-core lead, length max. 35 m with
a cross-section of 1.5 mm
16
(cont.)
Take power for external controls
from "L" and "N". The switched live
to start the boiler goes into "1".
Please note that if there are two cir-
cuits connected, e.g. heating and
hot water, you cannot use a plug-in
timer or programmable room ther-
mostat receiver. Two channel
switching must be external to the
boiler.
The only exception is if weather
compensation is also fitted.
2. Plug the power cable supplied with
the outside temperature sensor into
slot "X21".
3. Connect the outside temperature
sensor to terminals 3 and 4 (see
page 15).
2