English (GB)
18
8. Setting the pump
8.1 Pump setting for system type
Fig. 10
Selection of pump setting for system type
Factory setting = highest proportional-pressure curve (
PP2
).
Recommended and alternative pump settings according to fig. 10:
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
11. 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
11. Pump settings and pump performance
T
M
05
19
21
45
12
Pos.
System type
Pump setting
Recommended
Alternative
A
Underfloor heating
Lowest constant-pressure curve (
CP1
)*
Highest constant-pressure curve (
CP2
)*
B
Two-pipe systems
Highest proportional-pressure curve (
PP2
)*
Lowest proportional-pressure curve (
PP1
)*
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
14.1 Guide to performance curves
I
II
III
POWER
ON
I
II
III
POWER
ON
I
II
III
POWER
ON
OK
(OK)
I
II
III
POWER
ON
I
II
III
POWER
OWER
O
R
ON
I
II
III
POWER
ON
OK
(OK)
I
II
III
POWER
ON
I
II
III
POWER
ON
I
II
III
POWER
ON
OK
(OK)
I
II
III
POWER
ON
I
II
III
POWER
ON
I
II
III
POWER
ER
ON
OK
(OK)
A
B
C
D
Summary of Contents for ALPHA1 15-40
Page 1: ...GRUNDFOS ALPHA1 Installation and operating instructions GRUNDFOS INSTRUCTIONS ...
Page 2: ...2 ...
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