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
Repeat the procedure, if necessary.
T
M
05
19
32
45
12
22
2
PHA2
PHA2
AL
AL
AL
ALPHA2 L
I
II
III
POWER
ON
1
2
3
I
III
= 10 Min.
Caution
The pump must not run dry.
