Danfoss FED-W 0.5, FED-W 10, FED-WF Data sheet
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Data Sheet
FED-W Sensors - Sequence Control of Cooling and
Heating Circuit
Products
FED-W 10 with integrated sensor FED-WF with remote sensor
Ordering and Specifications
Application
The FED sensors are used in applications in which
a cooling and a heating circuit are to be
controlled by one controller.
Both FED-W and FED-WF sensors can be applied
to chilled ceilings, fancoils or induction units.
Type Sensor Capillary tube Setting range Code no.
FED-W 0.5 Integrated sensor 0.5 m
FED-W 10 Integrated sensor 10 m 013G5480
FED-WF Remote sensor 2 + 2 m 013G54xx
Sequence control of 4-pipe chilled ceiling or radiator
For control of cooling and heating circuits in
fancoil and induction units use the FED-WF with
remote sensor.
By placing the sensor in the air inlet a quicker
reaction time of the air temperature changes is
achieved.
013G5481
17-27 °C
1. RA-C
2. FED-W
3. RA-N
4. Cooling circuit
5. Heating circuit/radiator
Danfoss Heating Solutions VDUND202 © Danfoss 02/2011 1
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Data Sheet FED-W Sensors - Sequence Control of Cooling and Heating Circuit
Sequence control of fancoils and induction units
1. RA-C
2. FED-WF
3. RA-N / RA-N
4. Cooling circuit
5. Heating circuit
FED Sensor Design
1. Cooling adapter
2. Actuator
3. Remote sensor (only FED-WF)
4. Capillary reel (only FED-W 10)
5. FED-W sensor
The FED sensors are applied with the RA-N and
the RA-C valves.
The FED sensors are equipped with a reverse
The valve in the heating circuit will open when
the temperature falls below the setpoint
temperature.
device for the control of cooling circuits. With the
reverse device the valve in the cooling circuit will
open when the temperature rises above the
setpoint temperature.
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Data Sheet FED-W Sensors - Sequence Control of Cooling and Heating Circuit
Temperature Setting
Sequence Control
Comfort temperature ~ 22 °C at Xp = 0 K The FED sensors have been developed for room
temperature control via water-based cooling and
heating systems.
The FED sensors are based on the self-acting
principle. The liquid-filled sensors control the
valves via capillaries and adapters.
The scale shows the approximate set-point offset
from the comfort temperature which is
approximately 22° C at Xp = 0 K.
The control is done by the sensor, in which a
Sequence control of cooling and heating circuit
neutral zone is built-in. In the neutral zone both
valves are closed and neither an activation of the
valve in the heating circuit nor of the valve in the
cooling circuit takes place. In that way it is
secured that cooling and heating do not take
place simultaneously.
The neutral zone is in the area from 0.5 - 2.5 °C
dependending on the system design. If the
differential pressure is high on both circuits (~0.6
bar), the neutral zone is at a minimum. On the
other hand if the differential pressure is low on
both circuits (~0.1 bar), the neutral zone is at a
maximum.
An adjustment of the neutral zone can be made
1. Water flow through heating circuit
2. Water flow through cooling circuit
3. Neutral zone
by turning the knob of the cooling adapter with a
pair of pointed pliers. Turning clockwise the
neutral zone is increased, turning counterclockwise the neutral zone is decreased. The
factory setting of the neutral zone is marked in
the knob recess.
Irrespective of the temperature setting of the
FED-sensor the necessary neutral zone will
always be kept. See also figures below.
1. Adjustment of the neutral zone
2. Factory setting mark
Setting of comfort temperature – hotter t1 –> t2 (e.g. 22 °C –> 24 °C)
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