Appendix Terminology - Viessmann VITOPEND 100-W Operating Instructions Manual

Appendix
Terminology
The outside temperature is captured
and transmitted to the control unit by a
sensor. The sensor is fitted to the exte-
rior of the building.
Heating curve
Heating curves illustrate the relation-
ship between the outside temperature,
the room temperature and the heating
water temperature (boiler water temper-
ature). The lower the outside tempera-
ture, the higher the heating water tem-
perature (boiler water temperature).
Heating circuit
A heating circuit is a sealed unvented
circuit that connects the boiler and radi-
ators, in which the heating water circu-
lates.
Heating water temperature
The temperature of the heating water
that flows to the radiators (roughly
equal to boiler water temperature).
Boiler water temperature
The heating water in the boiler (boiler
water) is heated to the temperature set
at the control unit. This temperature is
referred to as boiler water temperature.
Room sealed operation
The combustion air is drawn from out-
side the building.
42
(cont.)
Room temperature
■ Standard room temperature:
Set the standard room temperature
for periods when you are at home
during the day.
■ Reduced room temperature:
For periods when you will be absent
or during the night, set the reduced
room temperature; see "Heating
mode".
Safety valve
Safety equipment that must be installed
in the cold water line by your heating
contractor. The safety valve opens
automatically to prevent excess pres-
sure in the DHW cylinder.
Solar circuit pump
In conjunction with solar thermal sys-
tems.
The solar circuit pump delivers the
cooled heat transfer medium from the
DHW cylinder indirect coil to the solar
collectors.
Set temperature
Specific temperature that should be
reached, e.g. set DHW temperature.
Summer mode
Operating program "Only DHW".
In warmer months, you can switch off
heating mode. The boiler remains
operational for DHW heating. Central
heating is switched off.