Data Sheet
FED Sensors - Sequence Control of Cooling and
Heating Circuit
Products
FED-WIF with integrated sensor |
FED-FF with remote sensor |
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.
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.
Ordering and Specifications |
Type |
Sensor |
Capillary tube |
Setting range |
Code no. |
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FED-IF |
Integrated |
7 + 8 m |
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013G5461 |
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FED-IF |
Integrated |
4 + 11 m |
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17-27 °C |
013G5463 |
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FED-IF |
Integrated |
6 + 11 m |
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013G5469 |
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FED-FF |
Remote |
2 + 2 + 2 m |
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013G5462 |
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Application |
Sequence control of chilled ceiling and radiator |
Sequence control of fancoils and induction units |
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2 |
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1 |
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5 |
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5 |
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1. |
FED-IF |
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1. |
FED-FF |
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2. |
RA-C |
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2. |
RA-C |
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3. |
RA-N |
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3. |
RA-C / RA-N |
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4. |
Cooling circuit |
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4. |
Cooling circuit |
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5. |
Heating circuit/radiator |
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5. |
Heating circuit |
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Danfoss Heating Solutions |
VDXDZ302 |
© Danfoss |
02/2011 |
1 |
Data Sheet |
FED Sensors - Sequence Control of Cooling and Heating Circuit |
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FED Sensor Design
Temperature Setting
Sequence Control
3
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1. |
Cooling adapter |
4 |
2. |
Actuator |
1 |
3. |
Remote temperature adjuster |
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4. |
Remote sensor (only FED-FF) |
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5. |
Capillary reel (only FED-IF) |
5 |
6. |
Heating adapter |
2
6
The FED sensors are applied with the RA-N and |
open when the temperature rises above the |
the RA-C valves. |
setpoint temperature. The valve in the heating |
The FED sensors are equipped with a reverse |
circuit will open when the temperature falls |
device for the control of cooling circuits. With the |
below the set-point temperature. |
reverse device the valve in the cooling circuit will |
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Comfort temperature ~ 22 °C at Xp = 0 K |
The FED sensors have been developed for room |
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temperature control via water-based cooling and |
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heating systems. |
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The FED sensors are based on the self-acting |
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principle. The liquid-filled sensors control the |
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valves via capillaries and adapters. |
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The scale above shows the approximate set-point |
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offset from the standard comfort temperature |
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which is approximately 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.
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.
Sequence control of cooling and heating circuit
1 2
3
1.Water flow through heating circuit
2.Water flow through cooling circuit
3.Neutral zone
2 |
VDXDZ302 |
© Danfoss |
02/2011 |
Danfoss Heating Solutions |
Data Sheet |
FED Sensors - Sequence Control of Cooling and Heating Circuit |
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An adjustment of the neutral zone can be made |
1 |
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by turning the knob of the cooling adapter with a |
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pair of pointed pliers. |
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Turning clockwise, the neutral zone is increased, |
2 |
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turning counter-clockwise the neutral zone is |
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decreased. The factory setting of the neutral zone |
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is marked in the knob recess. |
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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 => t2
Setting of comfort temperature, example: hotter t1 => t0
Temperature Control |
a) Control of heating circuit - FED with RA-N valve |
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Through Sequence Control |
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with FED Sensor |
Xp = 0 K |
* |
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Xp = 2 K
Danfoss Heating Solutions |
VDXDZ302 |
© Danfoss |
02/2011 |
3 |
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