Viessmann VITODENS 200-W Technical Manual page 19

Vitodens 222-W
(cont.)
Residual head of the integral circulation pump
Vitodens 222-W, 4.8 - 26.0 kW
50 500
40 400
30 300
20 200
10 100
0
0
0 100 200
Flow rate in l/h
A Stage 1
B Stage 2
C Upper operational limit
Vitodens 222-W, 8.8 - 35.0 kW
50 500
40 400
30 300
20 200
10 100
0 0
0 100 200
Flow rate in l/h
A Stage 1
B Stage 2
C Upper operational limit
Variable speed heating circuit pump in the Vitodens 222-W
The integral circulation pump is a highly efficient DC pump with more
than 50 % less power consumption than conventional pumps.
The pump speed and consequently the pump rate is regulated subject
to the outside temperature and the switching times for heating or
reduced mode. The control unit transmits the current default speed via
an internal data BUS to the circulation pump.
Individually match the minimum and maximum speed plus the speed
for reduced mode to the existing heating system using the control unit
codes.
In the delivered condition, the minimum pump rate (coding address
"E7") is set to 30 %. The maximum pump rate (coding address "E6")
is set to the following values:
VITODENS
300 400 500 600 700
300 400 500 600 700
A
B
800 900 1000 1100 1200
A
800 900 1000 1100 1200
Rated output range in kW
4.8-19
6.5-26
8.8-35
C
1300 1400
C
B
1300 1400
Speed settings in the
delivered condition in %
55
65
65
VIESMANN
19
2