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Data Sheet
FED Sensors - Sequence Control of Cooling and
Heating Circuit
Products
FED-WIF with integrated sensor FED-FF 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-IF and FED-FF sensors can be applied to
chilled ceilings, fancoils and induction units.
For control of cooling and heating circuits in fancoil and induction units use the FED-FF with
remote sensor.
Type Sensor Capillary tube Setting range Code no.
FED-IF Integrated 7 + 8 m
FED-IF Integrated 4 + 11 m 013G5463
FED-IF Integrated 6 + 11 m 013G5469
FED-FF Remote 2 + 2 + 2 m 013G5462
Sequence control of chilled ceiling and radiator Sequence control of fancoils and induction units
By placing the sensor in the air inlet a quicker
reaction time of the air temperature changes is
achieved. Using the remote sensor, the remote
temperature adjuster can be placed directly on
the cabinet.
013G5461
17-27 °C
1. FED-IF
2. RA-C
3. RA-N
Danfoss Heating Solutions VDXDZ302 © Danfoss 02/2011 1
4. Cooling circuit
5. Heating circuit/radiator
1. FED-FF
2. RA-C
3. RA-C / RA-N
4. Cooling circuit
5. Heating circuit
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
FED Sensor Design
1. Cooling adapter
2. Actuator
3. Remote temperature adjuster
4. Remote sensor (only FED-FF)
5. Capillary reel (only FED-IF)
6. Heating adapter
Temperature Setting
Sequence Control
The FED sensors are applied with the RA-N and
the RA-C valves.
The FED sensors are equipped with a reverse
device for the control of cooling circuits. With the
reverse device the valve in the cooling circuit will
Comfort temperature ~ 22 °C at Xp = 0 K
The temperature control is done by the sensor, in
which a neutral zone is built-in.
In the neutral zone neither an activation of the
valve in the heating circuit nor of the valve in the
cooling circuit takes place. This way it is secured
that cooling and heating do not take place
simultaneously.
open when the temperature rises above the
setpoint temperature. The valve in the heating
circuit will open when the temperature falls
below the set-point temperature.
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 above shows the approximate set-point
offset from the standard comfort temperature
which is approximately 22° C at Xp = 0 K.
Sequence control of cooling and heating circuit
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.
1. Water flow through heating circuit
2. Water flow through cooling circuit
3. Neutral zone
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
An adjustment of the neutral zone can be made
by turning the knob of the cooling adapter with a
pair of pointed pliers.
Turning clockwise, the neutral zone is increased,
turning counter-clockwise 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, example: hotter t1 => t
Setting of comfort temperature, example: hotter t1 => t
2
0
Temperature Control
a) Control of heating circuit - FED with RA-N valve
Through Sequence Control
with FED Sensor
Danfoss Heating Solutions VDXDZ302 © Danfoss 02/2011 3
Xp = 0 K
Xp = 2 K
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