Variable Speed Heating Circuit Pump - Viessmann VITODENS 050-W Technical Manual

Vitodens 050-W
Note
This boiler (IP rating: IP X4) is approved for installation in wet rooms
inside safety zone 1, to DIN VDE 0100. Exposure to jets of water
must be prevented.
1
For open flue operation, the boiler may only be operated with a
splash cover.
Observe the requirements of DIN VDE 0100.

Variable speed heating circuit pump

The integral circulation pump is a highly efficient pump with substan-
tially lower power consumption than conventional pumps.
The pump speed and consequently the pump rate are controlled
subject to the outside temperature and the switching times for heat-
ing mode or reduced mode. The control unit transmits the currently
specified speeds to the circulation pump via a PWM signal.
The min. and max. speeds and the speed for reduced mode can be
matched to the existing heating system via parameters at the control
unit.
Setting (%) in group heating circuit 1:
■ Min. speed: Parameter 1102.0
■ Max. speed: Parameter 1102.1
VIESMANN
12
(cont.)
■ In the delivered condition, the minimum pump rate and the maxi-
mum pump rate are set to the following values:
Rated heating output in kW
19
25
32
■ In conjunction with a low loss header, heating water buffer cylinder
and heating circuits with mixer, the internal circulation pump runs
at a constant speed.
Speed settings in the deliv-
ered condition in %
Min. pump rate Max. pump
rate
40 100
40 100
40 100
VITODENS