16
Installation
Hydraulics
Circulation pumps
Pump modulation
A number of functions are available for
the modulating boiler pump.
• None (Function is switched-off)
• Demand (Do not use this function)
• Boiler setpoint (Do not use this
function)
• Temp differential nominal
• Burner output (Do not use this
function)
Temp differential nominal
The LMS continues to control the
boiler’s output such that the boiler
temperature setpoint is maintained.
Pump speed control controls the boiler
pump’s speed in a way that the
parameterized nominal temperature
differential of boiler return and boiler
flow is maintained.
If the effective differential is greater
than the nominal differential, the
pump’s speed is increased, otherwise it
is decreased.
The pump’s speed is limited by the
parameterized minimum and maximum
speed.
Recommended settings:
Radiators 20K
Under floor heating
10K
Mixed systems
10K
System separation (LV
20K
header/Plate heat exchanger)
GRUNDFOS UPM3 25-70
Boiler type
Circulating water volume (
T=20K)
Residual head
Energy consumption
l/min
l/u
mbar
kPa
PWM (%)
Pmax pump
[W]
EEI
13
9,5
570
200
20
45
15
< 0,20
19
13,0
781
200
20
55
25
< 0,20
24
15,8
950
200
20
60
28
< 0,20
34
24,1
1444
200
20
75
55
< 0,20
35L*
24,6
1473
200
20
55
25
< 0,20
46*
32,3
1938
200
20
70
49
< 0,20
54*
38,0
2279
200
20
90
60
< 0,20
Combi 24
15,8
950
200
20
60
28
< 0,20
Combi 34
24,1
1444
200
20
80
57
< 0,20
* Note:
This boiler has to be connected to a
low velocity header and secondary
circuit pump.
Line no.
Selection possibilities
Factory setting
2317
Temp differential nominal
20
1)
2320
Pump modulation
Temp differential nominal
2)
2321
Starting speed
100
2322
Pump speed min
45
2323
Pump speed max
THI S PLUS 13:
45
THI S PLUS 19:
55
THI S PLUS 24 / Combi 24:
60
THI S PLUS 34 / Combi 34:
75
THI S PLUS 35L:
55
THI S PLUS 46:
70
THI S PLUS 54:
90
1)
Adjust value to hydraulic system
2)
Do not adjust this value
Minimum speed of the boiler pump
Values less than 45% only set in case
of flow noises during commissioning.
In this case read new residual head
from chart and adjust the bypass
accordingly.
The use of a low velocity header or
plate heat exchangers can be set up to
min. 25% (OEM limitation).
Note:
Too low pump speeds can lead to
unfavorable temperature conditions
during ignition load and may result in
error messages.
