Danfoss VX Solo II Series Instructions For Installation And Use Manual page 29

Instructions for installation and use
12.0 Circulation pump(s) - Heating Circuit
Grundfos Pumpe ALPHA2 L
Substation start-up /pump
Do not start up the pump untill the system has been filled with the
flow media and vented. See Grundfos instructions for the pump.
The pump is self-venting. It need not be vented before start-up.
Air in the pump may cause noise. This noise ceases after a few minu-
tes running.
Please note, that the system cannot be vented through the pump
Please note, that the pump must not run dry.
Pump settings
GRUNDFOS ALPHA2 L has seven optional settings which can be
selected with the push-button.
Enclosed photo shows the recommended and alternative pump set-
tings for system types.
The pump is set at the factory to the "Higest proportional-pressure
curve" (PP2). In this control mode, the pump performance and con-
sequently the power consumption are adjusted according to the
heat demand in the system.
If the recommended pump setting does not give the desired distri-
bution of heat in the rooms of the house, change the pump setting
to the shown alternative.
For further infomation about pump settings please refer to the en-
closed Grundfos instructions.
ALPHA2 L,
Installation and operating instructions
Summer operation
Substations with Danfoss T°C Thermostat
In the summer, you can stop the pump by switching it off at the mains.
However, remember to start the pump (briefly) at least once a month
during the summer.
Systems with Danfoss ECL
Outside the heating period, the pump will be disconnected auto-
matically from the heating system. During the summer period, the
controller will start the pump for a minute at least once very three
days to prevent the pump from blocking.
Start-up after summer operation - venting
Please note that it may be necessary to vent the system again. To
vent the system, use the air vent, if any, in the substation, or the
radiators or, if appropriate, the air valve at the highest point of the
system.
For further information about venting of pump etc. please refer to
the enclosed Grundfos instructions.
Danfoss District Energy
VX Solo II substations
Recommended and alternative pump settings according to system
type.
VI.GP.P2.02 DKDHR 29 29