Technical Data - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Additional Information

Technical Data

Call for heat priority logic table
The Vitodens 100-W, WB1B boiler has several operating control options. The following table provides the priority levels of
each of the different operating controllers.
Priority Control operating mode
1 Freeze protection
2 Open Therm
3 DHW / external heat demand
4 Outdoor temperature sensor
5 0-10 VDC
6 Room thermostat (RT terminal)
*1
Boiler control will adjust the boiler water temperature set-point to the highest of all input signals.
*2
Priority #5 (outdoor temperature sensor / RT contact) not functional when 0-10V DC or OT inputs are recognized by the boiler control.
74
Required signal
*1
Boiler temperature <5ºC / 41ºF
OT signal
Close DHW contact in power / pump
module
- boiler set-point temp. = 78ºC (non-
adjustable)
*2 - Temperature dial "tr"setting
- RT contact closed or OT
connection terminals 1 & 2 shorted.
0-10 VDC signal.
Close RT contact in power / pump
module.
Pump output Pump off delay
On 4 minutes / 240
seconds
On 20 seconds
On 20 seconds
On 4 minutes / 240
seconds
On 20 seconds
On 4 minutes / 240
seconds