Input Module Description Ot (Open Therm) & 0-10V Reset Modules - Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual

Input Module Description OT (Open Therm) & 0-10V Reset Modules
Signal translation protocol of 0-10 V & OT to boiler approximate supply temperature
Max. boiler temp.
Start-up and Maintenance
A Lowest voltage signal (from below 0.9 V) to start boiler (cut-in) = 2.2 V
Start-up and Maintenance
Max. boiler temp.
B Lowest voltage signal to shut down (cut-out) the boiler = 0.9 V
Fig. 80 Input module voltage - temperature translation chart
DC Voltage input
DC Voltage input
Additional Information
(field supplied)
The charts are applicable to 0-10V
reset modules and OT devices if used
with Vitodens 100 boilers. Refer to
page 74 for the heat request priority
table.
The voltage signal must fall below
[
0.9VDC (V 0.9) in order for the
Input Module to reset temperature
set-point from 81º F / 27º C to 43º
F / 6º C. Any voltage signal between
0.9 to 2.2V will maintain a supply
temperature of 81º F / 27º C.
Boiler cycles ON/OFF based on the
fixed differential settings of the boiler
control module.
73