18 DKDHR
VI.GP.B1.02
Danfoss District Energy
Instructions
Kompakt H 28/35/42
13.0 Circulation pump
13.1 Alternative Circulation pump Grundfos Magna 25-100
The Kompakt H substations come standard with Wilo circulation pumps.
Alternatively Grundfos pumps may be used. The Wilo Wilo installation
and operating instructions will in such cases be replaced by Grundfos
installation and operating instructions.
Substation start-up / pump
Do not start up the pump until the system has been filled with the
flow media and vented.
On traditional heating systems the selector switch (the red button)
must be turned left for selection of constant pump operating mode.
It is recommended to set the pump at highest speed of rotation be-
fore start-up. Then set the pump at lowest possible speed of rotation,
in due consideration of the electricity consumption and the heating
comfort. (The factory setting of the selector switch, “the red button”
does not comply with the flow rate required for the system)
Floor heating
Select variable pump control mode for floor heating. Turn the red but-
ton to the right.
Set the pump at lowest possible speed of rotation, in due consideration
of the electricity consumption and the heating comfort.
Summer operation
The circulation pump for heating is automatically switched off in pe-
riods without heat demand. To prevent the pump from blocking in
periods without heat demand, the controller automatically switches
on the pump for some minutes every third day. In this period the
circulation pump should be set at the highest speed of rotation.
The shut-off valve/summer valve S in top of the station can be closed
during this period. It is recommendable to vent the system after the
summer period.
If the heating requirement increases the pump setting can be changed
by means of the selector switch
For more information about venting of pump etc. please refer to en-
closed installation and operating instructions:
Wilo Stratos PARA
Installation and operation instructions
S
For systems with Grundfos circulation pumps please follow the en-
closed Grundfoss Installation and Operating Instructions for setting
of pump.
In general, Grundfos recommends:
• AUTOADAPT (factory setting)
(This control mode is suitable for most installation. During operation, the pump auto-
matically reduces the factory-set setpoint and adjusts it to the actual system characte-
ristic).
• Proportional-pressure control
(systems with relatively large pressure losses).
• Constant-pressure control
(systems with relatively small pressure losses).
• Automatic night-time duty
Please note that the system can not be vented through the pump.
Please see enclosed instructions,
Magna-25-100 Installation and operating instructions
