English (GB)
12
8. Setting the pump
8.1 Pump setting for system type
Fig. 10
Selection of pump setting for system type
Factory setting = AUTO
ADAPT
.
Recommended and alternative pump settings according to fig. 10:
AUTO
ADAPT
(underfloor heating and two-pipe systems)
The AUTO
ADAPT
function adjusts the pump performance to the
actual heat demand in the system. As the performance is
adjusted gradually, it is recommended to leave the pump in the
AUTO
ADAPT
position at least one week before changing the pump
setting.
If you choose to change back to AUTO
ADAPT
, the pump
remembers its last setpoint in AUTO
ADAPT
and resumes the
automatic adjustment of the performance.
Changing from recommended to alternative pump setting
Heating systems are "slow" systems that cannot be set to the
optimum operation within minutes or hours.
If the recommended pump setting does not give the desired
distribution of heat in the rooms of the house, change the pump
setting to the shown alternative.
Explanation to pump settings in relation to performance curves,
see section
12. Pump settings and pump performance
.
8.2 Pump control
During operation, the pump head will be controlled according to
the principle "proportional-pressure control" (
PP
) or "constant-
pressure control" (
CP
).
In these control modes, the pump performance and consequently
the power consumption are adjusted according to the heat
demand in the system.
Proportional-pressure control
In this control mode, the differential pressure across the pump is
controlled according to the flow.
The proportional-pressure curves are indicated by
PP1
and
PP2
in the Q/H diagrams. See section
.
Constant-pressure control
In this control mode, a constant differential pressure across the
pump is maintained, irrespective of the flow.
The constant-pressure curves are indicated by
CP1
and
CP2
and
are the horizontal performance curves in the Q/H diagrams.
See section
12. Pump settings and pump performance
TM
05 19
21 451
3
Pos.
System type
Pump setting
Recommended
Alternative
A
Underfloor heating
AUTO
ADAPT
*
Highest constant-pressure curve (
CP2
)* or
lowest constant-pressure curve (
CP1
)*
B
Two-pipe systems
AUTO
ADAPT
*
Highest proportional-pressure curve (
PP2
)*
C
One-pipe systems
Lowest proportional-pressure curve (
PP1
)*
Highest proportional-pressure curve (
PP2
)*
D
Domestic water
Constant speed, speed I*
Constant speed, speed II or III*
* See section
15.1 Guide to performance curves
.
AUTO
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
O
O
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
O
O
ADAPT
I
II
III
AUTO
ADAPT
I
II
III
AUTO
O
O
ADAPT
I
II
III
AUTO
O
O
ADAPT
T
I
II
III
OK
(OK)
OK
(OK)
OK
(OK)
OK
(OK)
A
B
C
D
