Variable pressure
Max. pos.
Venting
Vertical pos.
Constant pressure
Max. pos.
Wilo Yonos PARA
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Instructions for installation and use
TD & S substations
Danfoss District Energy
VI.GP.U2.02
DKDHR
Pump - Grundfos Alpha2 L, systems with self-acting thermostat
Note! Do not start up the pump untill the system has been filled with
the flow media and vented. The pump is self-venting.
The pump is set at the factory to the “Highest proportional-pressure
curve” (PP2). In this control mode, the pump performance and conse-
quently the power consumption are adjusted according to the heat
demand in the system.
For 1-string systems it is recommended to set the pump to “ Lowest
proportional-pressure curve PP1”, in accordance with the instructions to
the right.
If the heating system consists exclusively of floor heating, set the pump
to “Lowest constant-pressure curve”
.
Alternatively, set the pump in ac-
cordance with the instructions to the right or pursuant to the manual
enclosed.
Pump - Grundfos Alpha 2 L on systems with ECL controller
On systems with ECL controller the pump must be set in
pos. I or II
(constant-pressure curve).
For further infomation about pump settings please refer to the en-
closed Grundfos instructions.
ALPHA2 L,
Installation and operating instructions
Pump – Wilo Stratos Yonos OEM, systems with self-acting thermostat
Set the pump to its highest speed when starting operation of the system.
On a conventional radiator system, turn the red switch to the left (vari-
able curve) and set it to “Max. pos.” initially.
Then set the pump to the lowest possible position, depending on the
heating requirement for the building - taking into account aspects such
as cooling and power consumption.
For floor heating systems and old radiator set-ups with large pipes and
radiators, turn the red switch to the right (constant curve) and set it to
“Max. pos.” initially. Then reduce the pressure until it matches the heating
requirement for the building – taking into account cooling and power
consumption.
Pump – Wilo Yonos OEM, systems with Danfoss ECL
On systems with ECL controller turn the red switch to the right (constant
curve) and set it to “Max. pos.” initially. Then set the pump to the lowest
possible position, depending on the heating requirement for the build-
ing - taking into account aspects such as cooling and power consump-
tion.
Venting: The pump features a built-in venting function, which can be
used when the system needs to be bled. Turn the red switch to the verti-
cal position. The pump will then run a venting routine that lasts 10 min-
utes. There may be some noise during this phase. Once the 10-minute
period is finished, reset the pump according to the instructions above.
For additional information, see the manual:
Wilo Yonos PARA.
Summer operation (all pump types)
Summer operation (systems with self-acting 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.
Summer operation (systems with Danfoss ECL 210)
Outside the heating period, the pump will be disconnected automati-
cally from the heating system. During the summer period, the controller
will start the pump for a minute at least once every 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 vent valve in the substation or on the radiators and,
if appropriate, the air valve at the highest point of the system.
Grundfos Alpha 2 L
