Front Panel; Summer Mode Switch; Override Switch; Power Switch - Viessmann VITOTRONIC 100 Installation, Start-Up And Service Instructions Manual

Vitotronic 100, KW10B Installation, Start-up and Service
Overview
(continued)

Front panel

Front view of the control

Summer mode switch

The front mounted summer mode switch F when in the
up (summer/winter) position a will allow the thermostat
terminal to call for heat, DHW functionality and outdoor
reset when programmed. Outdoor reset operation is based
on the Warm weather shut down setting.
When the summer mode switch F is in the down
(summer/DHW) position w, the thermostat terminal to
call for heat will be disabled.
Units equipped with an outdoor temperature sensor
and programmed for either internal outdoor reset or
OpenTherm enabled thermostat will start calculating a
boiler water temperature at an outdoor temperature of
o o
37 F (3 C) and below. The boiler pump will be turned
on and run continuously.

Override switch

The front mounted override switch H when in the up
position h, turns the boiler pump on and enables stage 1
and 2 call for heat. The boiler operates on the adjustable
high limit temperature.
When the override switch H is in the down position a,
the system is in normal operation.

Power switch

The front mounted power switch G when in the up
position I, the control system is on.
When the power switch G in the down position 0, the
control system is off.
Electrical Connections
11