Grundfos alpha2l User Manual

14
7. Setting the pump
Contents:
7.1 Pump setting for system type
7.2 Pump control.
7.1 Pump setting for system type
Fig. 9 Selection of pump setting for system type
Factory setting = Highest proportional-pressure curve (PP2).
Recommended and alternative pump settings according to fig. 9:
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 10. Pump settings and pump performance.
TM05 1921 4512
I
II
III
POWER
ON
I
II
III
P
O
WER
ON
I
II
III
POWER
ON
OK
(
OK
)
I
II
III
POWER
ON
I
II
III
P
O
WER
O
WER
O
R
ON
I
II
III
POWER
ON
OK
(
OK
)
I
II
III
POWER
ON
I
II
III
POWER
ON
I
II
III
P
O
WER
ER
ON
OK
(
OK
)
2
2
P
HA2
P
HA2
AL
AL
ALPHA2 L
I
II
III
POWER
ON
I
II
III
POWER
ON
I
II
III
P
O
WER
O
N
OK
(
OK
)
A
B
C
D
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 13.1 Guide to performance curves.

Grundfos alpha2l Specifications

General

Voltage	230 V
Protection Class	IP42
Maximum Operating Pressure	10 bar
Enclosure Class	IP42
Insulation Class	F
Pump Housing	Cast iron
Type	Circulator pump
Frequency	50 Hz
Approvals	CE
Connection	G 1"
Ambient Temperature	Up to 40°C