Heating Circuit - Viessmann VITOTRONIC 100 Operating Instructions Manual

Appendix
Terminology
(cont.)
Operating status
In the "Heating and DHW" operating program, the
operating status changes from "Standard heating
mode" to "Reduced heating mode" and vice versa. The
times at which the operating status is changed over
are defined by you when setting the time program.

Heating circuit

A heating circuit is a sealed unvented circuit that con-
nects the boiler and radiators and in which the heating
water circulates.
Heating circuit pump
Circulation pump for circulating the heating water in
the heating circuit
Open flue operation
The combustion air is drawn from the room where the
boiler is installed.
Room sealed operation
The combustion air is drawn from outside the building.
Safety valve
Safety equipment that must be installed in the cold
water pipe by your contractor. The safety valve opens
automatically to prevent excess pressure in the DHW
cylinder.
Solar circuit pump
In conjunction with solar thermal systems.
Set temperature
See "Set temperature".
Summer mode
Operating program "Only DHW".
40
A heating system may comprise several heating cir-
cuits. For example, one heating circuit for the rooms
occupied by you and one heating circuit for the rooms
of a separate apartment.
The heating circuits are also equipped with safety
valves.
The solar circuit pump delivers the cooled heat transfer
medium from the indirect coil of the DHW cylinder to
the solar collectors.
In warmer months, you can switch off heating mode.
The boiler remains operational for DHW heating. Cen-
tral heating is switched off.