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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
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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
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Xp = 0 K
Xp = 2 K
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
b) Control of cooling circuit - FED with RA-C valve
Xp = 0 K
Xp = 3 K
*Note!
Example at neutral zone = 2 °C
Setpoint = 22 °C
The FED sensor controls in sequence via two
temperature scales: one for the heating circuit (a)
and one for the cooling circuit (b).
When the setting knob is turned a parallel control
of both temperature scales is taking place. The
neutral zone ensures that cooling and heating do
not take place simultaneously.
A setting in the red temperature area means that
the set point of both cooling and heating circuit
is raised.
A setting in the blue temperature area lowers the
set point of both cooling and heating circuits.
Example
The setting knob is turned to increase the room
temperature with 2 °C from 22 °C to
approximately 24 °C at Xp = 0 K on the heating
valve. Due to the neutral zone the set point of the
cooling valve at Xp = 0 K will be between 0.5-2.5 K
higher, depen-ding on the system design.
Sequenzing with FED thermostat
1. Waterflow, heating
2. Waterflow, cooling
3. Setpoint on knob (N = neutral zone)
Sequence control when rising the setpoint
temperature with 2 °C
The valve in the heating circuit will open at a
sensor temperature below 24 °C. If a RA-N valve is
mounted in the heating circuit and dimensioned
at the presetting N, the RA-N valve will provide
full water quantity at a P-band of 2 K, i.e. a sensor
temperature of 22°C.
1. Waterflow, heating
2. Waterflow, cooling
3. Nneutral zone
If the neutral zone e.g. is 2 K, the valve in the
cooling circuit will start opening at a sensor
temperature above 26 °C (setpoint: 24 °C +
neutral zone: 2 K).
With a RA-C valve in the cooling circuit (dimensioned at presetting N) the valve will provide full
water quantity with a P-band of 3 K, i.e. at a
sensor temperature of 29 °C (setpoint: 24 °C +
neutral zone: 2 K + P-band: 3 K).
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
Limiting the Set
Temperature of FED Sensors
Serial Coupling
The set temperature of the remote temperature
adjuster depends on the sensor type and the
valves, which are used with the sensors.
Minimum limitation of temperature area Maximum limitation of temperature area
Several possibilities of placing the FED remote temperature adjuster
It is easy to limit or lock the set temperature by
means of the built-in locking/limiting device.
Via the soft but strong ø 0.8 mm capillary and the
patented serial coupling of capillary and adapters
it is possible to control two valves in sequence.
The FED sensors are delivered with the cooling
adapter closest to the remote temperature
adjuster and the heating adapter furthest away
from the remote temperature adjuster.
It is easy to change the order of the valves: Just
loosen the actuators from the adapters and
exchange the adapters. The FED sensor still
controls in the right sequence.
The interchange of valve adapters provide
several different possibilities of placing the FED
remote temperature adjuster.
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
Design
1. Heating adapter
2. Actuator
3. Adjustment bellow
4. Capillary reel (only FED-IF)
5. Cooling adapter
6. Neutral zone adjustment knob
7. Reverse device
8. Adjustment bellow
9. Actuator
10. Capillary reel
11. Remote temperature adjuster
12. Bellow
13. Remote temperature sensor (only FEDFF)
Dimensions
FED-IF
FED-FF
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
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Data Sheet FED Sensors - Sequence Control of Cooling and Heating Circuit
Danfoss A/S
Heating Solutions
Haarupvaenget 11
8600 Silkeborg
Denmark
Phone:+45 7488 8000
Fax: +45 7488 8100
Email: heating.solutions@danfoss.com
www.heating.danfoss.com
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respective
companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
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