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Vitodens 100-W, B1HA series & B1KA Combi Installation/Service
Legend
A
Viessmann outdoor temperature sensor (OTS)
(field wiring)
B
OpenTherm (OT) 0-10V (field wiring)
C
Connection cable terminal
D
Power terminal block 120V
E
Power supply 120V
F
Power supply accessories 120V
G
Jumper*
%
DHW tank temperature sensor (B1HA only)
or
aquastat
* When using the operating methods ‘operation without
room temperature thermostat’ or ‘weather compensated
operation without room temperature thermostat’ and once
jumper
G
is installed, on terminal 96 ‘L’ and ‘1’, refer to
the operating instructions.
Electrical Connections to the Terminal Strip for Accessories
Additional Information
Follow the installation instructions of field supplied
operating controls.
What is OpenTherm (OT)?
The OpenTherm (OT) protocol is a point-to-point
communication system, which connects a boiler with a
room controller or other devices. The room unit calculates
a heating demand (water temperature request) and
transmits it to the boiler. The boiler will adjust the heat
input accordingly (low-high modulation).
The Viessmann Input Module is designed to accept a
0-10(VDC) modulating input signal from a boiler reset
module controller and send this signal to the Vitodens
100-W with OpenTherm communication.
OT-Devices
Boiler control
Boiler reset
module (0-10V
controller)
