Viessmann B1HF - Adjusting Pump Rate of Integral Circulation Pump

43
Operation of the integral circulation pump as heating circuit pump for heating circuit 1
The pump speed and consequently the pump rate are
controlled subject to the outside temperature and the
switching times for heating mode or reduced mode.
The max. speed for heating mode can be matched to
the existing heating system at the control unit.
Speed in %
100
+20 -20
Outside temperature in °C
-30+30
Min
Max
Fig. 27
Setting (%) in system configuration. See page 57.
■
In the delivered condition, the minimum pump rate
and the maximum pump rate are set to the following
values:
Rated heating output
in kW
Speed settings in the de-
livered condition in %
Min. pump
rate
Max. pump
rate
11 40 60
19 40 65
25 40 75
32 40 100
■
In the following system conditions, the internal circu-
lation pump is operated at a constant speed:
–
Low loss header or heating water buffer cylinder
and heating circuits with mixer
–
Constant operation
Residual head of integral circulation pump
Residual head
0
kPa
0 200 400 600 800 1000
Flow rate in l/h
100
200
300
400
0
10
20
30
40
500
50
mbar
1200100 300 500 700 900 1100
5
50
150 15
250 25
350 35
450 45
M
600
550 55
60
1300 1400
A
B
C
D
E
F
G
H
L
K
Fig. 28
M
Upper operational limit
Commissioning, inspection, maintenance
Adjusting pump rate of integral circulation pump
6167586