Technical Data - Viessmann VITODENS 100-W WB1B Series 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
2
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
1
Required signal *
Boiler temperature <5º C / 41º F
OT signal
Close DHW contact in power / pump
module
- boiler set-point temp. = 78º C
(non-adjustable)
- 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