Grundfos alpha2l User Manual

19
9.3 Venting of heating systems
Fig. 12 Venting of heating systems
The heating system can be vented via an air escape valve installed above
the pump (1).
In heating systems that often contain much air, Grundfos recommends the
installation of pumps with pump housing with air separator, i.e.
ALPHA2 L pumps, type ALPHA2 L XX-XX A.
When the heating system has been filled with liquid, follow this procedure:
1. Open the air escape valve.
2. Set the pump to speed III.
3. Let the pump run for a short period, depending on system size and
design.
4. When the system has been vented, i.e. when the possible noise has
ceased, set the pump according to the recommendations.
See 7. Setting the pump.
Repeat the procedure, if necessary.
TM05 1932 4512
22
2
P
HA2
P
HA2
ALAL
AL
ALPHA2 L
I
II
III
POWER
ON
1
2
3
I
III
= 10 Min.
Caution
The pump must not run dry.

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