External Switching Of The Heating Program - Viessmann Vitotronic 300 KW3 Installation Instructions Manual

External Switching of the Heating Program

External switching of the heating
program (potential-free contact)
Manually pre-selected
heating program
(with contact open)
9 Central heating
OFF/DHW OFF
or
w Central heating
OFF/DHW ON
or
rw Central heating
ON/DHW ON
Coding address "91" enables the
external heating program changeover
to be applied to individual heating
circuits.
Use switching module V for separate
heating program changeovers for 3
heating circuits .
Changed heating program (with contact closed)
Code 2
d5 : 0 <–> Permanent operation with reduced room temperature/DHW OFF
(factory
default)
d5 : 1 <–> Permanent operation with standard room temperature/DHW in
accordance with coding address "64"
1. Connect the potential-free contact to
terminals "1" and "2" in connector
.
2. Insert connector in terminal
"143" and apply strain relief to the
cable (see "Application of Strain
Relief").
IMPORTANT
When the contact is closed, the
manually preselected program can be
changed for all heating circuits at the
same time.
See Vitotronic 300
Service Instructions
19