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InstructIon
Shunt FHM-DK1/ -DK2
2
VI.UL.B1.02 Produced by Danfoss Floor Heating Hydronics · 08.2005
Instruction Shunt FHM-DK1/-K2
Design: The shunt is delivered assembled and can be
mounted directly on the manifold. As standard,
the shunt is delivered for left-side mounting.
However, it can be reversed.
Connection for ow and return ow is marked
with arrows on the shunt. Connection from below
(standard), from the side or from the top.
We recommend that, especially in connection
with district heating substations for direct heat-
ing, a dirt collector be mounted before the shunt
together with a possible dierential pressure
controller, (e.g. Danfoss AVPL).
Wiring diagram: All electric connections must be performed by
authorised personnel according to current rules
and regulations.
The Danfoss AT thermostat is a safety thermostat
for the protection of e.g. wooden oors against
NB: Cut o the power supply before opening/
setting the AT thermostat!
To set the AT thermostat, loosen the two screws
and lift o the housing.
In the top haIf, you will nd a temperature selec-
tor (see arrow), and the temperature scale is
marked on the base plate. Change the tempera-
ture by turning the selector.
The shut-down temperature should be 5-10 °C
over the operational temperature for the shunt.
This, however, depends on the ooring and pip-
ing. The recommended maximum temperature
of the supplier must be observed.
Screw the house back on when you have com-
pleted the setting.
Setting the AT
safety thermostat
(only FHM-DK1):
To check the temperature setting, e.g. on service
visits, remove the dark grey cover.
Example of system:
high temperatures. In the event of over tempera-
ture, the AT thermostat cuts o the oor-heating
control so as to close the thermal actuators.
If no controls are connected, the AT thermostat
will shut down e.g. the boiler or pump.
FHM-DK1
FHM-DK2
3
VI.UL.B1.02 Produced by Danfoss Floor Heating Hydronics · 08.2005
Instruction Shunt FHM-DK1/-DK2
Capacities for RA-C valve:
Presetting of
RA-C valve:
The calculated settings values can be chosen easily,
precisely and without the use of special tools.
- Remove the protective cap or the sensor unit.
- Lift the setting ring.
- Turn the setting ring clockwise until the preferred
scale value is against the reference point.
- Let go of the setting ring and check the setting.
Presetting
area
RA-C valve: The RA-C valve is placed on the return outlet for
the heat supply and is adjustable to the preferred
ow quantity that is to be fed to the shunt.
If there is more than one building, the maximum
available capacity is thus ensured. Furthermore,
the correct presetting will limit noise in the heat-
ing system.
The possible presetting values are:
1, 2, 3 and N. If you chose “N”, the valve will be
fully open (factory setting). Setting within the
hatched areas on the drawing should be avoided.
Once the sensor has been mounted, the presetting
is locked and thus secured against any changes.
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VI.UL.B1.02 Produced by Danfoss Floor Heating Hydronics · 08.2005
Instruction Shunt FHM-DK1/-K2
The preferred general ow in the shunt is preset
with the MSV-C valve. This valve moreover en-
ables documentation of ow and pressure loss.
MSV-C
(only FHM-DK1):
The shunt is equipped with a Grundfos Alpha+
pump for automatic variable speed, which
ensures constant pressure over the oor-heating
circuits and thus reduces power consumption.
Pump setting: The pump can be set as described in the instruc-
tions enclosed with the pump.
Dimensioned sketch:
FTC:
The FTC must be set to the preferred temperature in
the shunt, which is typically 30 °C – 40 °C depending
on the oor construction, insulation and ooring.
The maximum and minimum settings can be
limited as shown below:
Se enclosed instruction for the setting/use of the
MSV-C valve.
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