Danfoss FEK-IF, FEK-FF Data sheet
Data Sheet
FEK Sensors - Control of Cooling Circuit
Products
FEK-IF with integrated sensor |
FEK-FF with remote sensor |
The FEK sensor is installed in rooms which have surplus heat due to internal or external heat sources; i.e. only control of cooling circuit is needed.
When the room temperature rises above the set temperature the FEK sensor opens the cooling valve.
FEK-IF as well as FEK-FF sensors can be used for chilled ceilings, fan-coils and induction units.
For cooling circuits in fan-coils and induction units use the FEK-FF with remote sensor.
The remote sensor can e.g. be placed below the cabinet of the air inlet or on a separate wall surface.
By placing the sensor in the air inlet a quicker reaction time of the air temperature changes is achieved.
Ordering and Specifications |
Type |
Sensor |
Capillary tube |
Setting range |
Code no. |
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FEK-IF |
Integrated sensor |
5 m |
17-27 °C |
013G5465 |
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FEK-FF |
Remote sensor |
2 + 2 m |
013G5464 |
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Application |
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Control of cooling circuit - chilled ceiling |
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1. FEK-IF 2. RA-C
3. Cooling circuit
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3 |
Danfoss Heating Solutions |
VD33S302 |
© Danfoss |
02/2011 |
1 |
Data Sheet |
FEK Sensors - Control of Cooling Circuit |
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Control of cooling circuit - fancoils and inductions units |
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FEK Sensor Design |
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The FEK sensors are applied with RA-C valves.
The FEK sensors are equipped with a reverse device for the control of cooling circuits.
1. FEK-FF 2. RA-C
3. Cooling circuit
3
1.Cooling adapter
2.Remote temperature adjuster
3.Actuator
4.Remote sensor (only FEK-FF)
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With the reverse device the valve in the cooling circuit will open when the temperature rises above the set temperature.
Temperature Setting |
Comfort temperature ~ 22 °C at Xp = 0 K |
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The FEK sensors have been developed for room cooling via water-based cooling systems.
The FEK sensors are based on the self-acting principle. The liquid-filled sensors control the valves via capillaries and adapters.
2 |
VD33S302 |
© Danfoss |
02/2011 |
Danfoss Heating Solutions |
Data Sheet |
FEK Sensors - Control of Cooling Circuit |
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Temperature Control Through Cooling with FEK Sensor
Limiting the Set
Temperature of FEK Sensors
The scale shows the approximate set-point offset from the comfort temperature which is approximately 22° C at Xp = 0 K.
Control area of FEK sensor with RA-C valve
Xp = 0 K
Xp = 3 K
A setting in the blue temperature area means that the setpoint of the cooling circuit is placed below the comfort temperature, i.e. the valve will
open at a lower temperature than the comfort
temperature of appoximately 22 °C.
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With a setting in the red temperature area the setpoint of the cooling circuit is placed above the comfort temperature. The valve in the cooling circuit will open at a room temperature above the comfort temperature of approximately 22 °C.
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1.Waterflow cooling
2.Setpoint on knob
Example
The knob is turned to lower the comfort temperature with 4 °C from 22 °C to approx. 18 °C at Xp = 0 K.
As the set point temperature is at Xp = 0 K the
valve in the cooling circuit will not open before the sensor temperature exceeds 18 °C.
In the presetting N the RA-C valve works with a P- band of maximum 3 K. This means that the RA-C valve will be fully open and give maximum flow to the cooling circuit at a sensor temperature of approx. 21 °C (set point: 18 °C + P-band: 3 K).
1.Waterflow, cooling RA-C valve with presetting N
The set temperature of the remote temperature adjuster depends on the sensor type and the valves, which are used with the sensors.
1
It is easy to limit or lock the set temperature by means of the built-in locking/limiting device.
Danfoss Heating Solutions |
VD33S302 |
© Danfoss |
02/2011 |
3 |
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