Additional Information; Electrical Connections To The Terminal Strip For Accessories - Viessmann B1KA Installation And Service Instructions Manual

Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service

Electrical Connections to the Terminal Strip for Accessories

Boiler control
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).
Boiler reset
module (0-10V
controller)
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
Legend
A Viessmann outdoor temperature sensor (OTS)
(field wiring)
B OpenTherm (OT) or room thermostat(s)
C Connection cable terminal
D Power terminal block 120V
E Power supply 120V
F Power supply accessories 120V
%
DHW tank temperature sensor (B1HA only)
or aquastat
Note: When using the operating methods 'operation
without room temperature thermostat(s)' or 'weather
compensated operation without room temperature
thermostat' a jumper is installed, on terminals 1-2 B,
refer to the operating instructions.
For accessing electrical connections refer to information
starting on page 36.

Additional Information

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