Viessmann Vitodens 100-W Technical Data Manual page 12

Venting Options / Electrical Connection
12
Vitodens 100-W Venting Options
For an overview of venting options refer to the appendix starting on page 19. For detailed
information refer to the Vitodens Venting System Installation Instructions.
Electrical Connection
All electrical connections are made to the
boiler's integrated power pump module (120
VAC/60 Hz). Use disconnect means and
power service switch as per local code
requirements.
Control Unit
Function and construction
The control is integrated into the Vitodens
100-W boiler.
H Integrated diagnostic system
H For room temperature-dependent
operation, an external control or a room
temperature thermostat may be connected
H To control DHW temperature, a separate
DHW controller may be connected
H External heat demand
H 0-10 V (field wiring)
H
Viessmann outdoor temperature sensor
(field wiring)
H Open Therm (field wiring)
The control unit consists of:
H LCD Display
H Selector dial for boiler water temperature
adjustment
H Selector dial for service setting
H
Temperature adjustable high limit
H Boiler temperature sensor
H Burner fault display
H Burner fault reset
H
Pressure gage
H
Fuse
Boiler temperature sensor
The boiler temperature sensor is connected
to the control unit and built into the boiler.
Frost protection
Frost protection is continuously active. The
burner is switched ON when the boiler
water temperature reaches 41°F / 5°C and
is switched OFF again when the boiler water
temperature reaches at least 59 °F / 15°C
(but not more than 68°F / 20°C).
For details on the control, please
refer to the Vitodens 100-W
Operating Instructions.