Adjusting Pump Rate Of Integral Circulation Pump - Viessmann B1HF Installation And Service Instructions Manual

Adjusting pump rate of integral circulation pump

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.
100
Min
+30 +20
Outside temperature in °C
Fig. 27
Residual head of integral circulation pump
600 60
L
550 55
K
500 50
450 45
H
400 40
350 35
G
300 30
250 25
F
200 20
E
150 15
D
100 10
C
50 5
B
A
0 0
0 100 200
Flow rate in l/h
Fig. 28
M Upper operational limit
Max
-20 -30
300 400 500 600 700
Commissioning, inspection, maintenance
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
11
19
25
32
■ 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
–
800 900 1000 1100 1200
Speed settings in the de-
livered condition in %
Min. pump Max. pump
rate rate
40
40
40
40
M
1300 1400
60
65
75
100
43