Viessmann VITODENS Operating Instructions Manual page 60

Appendix
Terminology
Safety valve
A safety device that must be installed by
your heating contractor in the cold water
pipe. The safety valve opens automati-
cally to prevent excess pressure 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
indirect coil of the DHW cylinder to the
solar collectors.
Set temperature
Default 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 opera-
tional for DHW heating. Central heating
is switched off.
Cylinder loading pump
Circulation pump for heating the DHW in
the DHW cylinder
Drinking water filter
A device that removes solids from the
water. The drinking water filter is instal-
led in the cold water pipe upstream of the
DHW cylinder or the instantaneous
water heater.
60
(cont.)
Weather-compensated mode
See "Heating mode"
Time program
In the time programs, you specify what
your heating system should do at which
time.
DHW circulation pump
The DHW circulation pump transports
the DHW around a ring pipeline between
the DHW cylinder and the draw-off points
(e.g. hot tap). This ensures that hot water
is rapidly available at the draw-off point.