Danfoss FEV-IF, FEV-FF Data sheet

Data sheet FEV sensors
Control of heating circuit
Products
FEV-IF with integrated sensor FEV-FF with remote sensor
Ordering and specifications
Application
The FEV is a proportional controller which opens or closes the heating valve as a func­tion of the temperature deviation.
FEV-FF To be applied in systems with i.e. fancoils or induction units. By placing the remote sensor
in the room-air inlet of the unit a smaller re­FEV-IF To be applied in systems with i.e. ceiling-, floor- or radiator heating. The temperature-
sponse time to temperature changes can be
achieved which will result in a more accurate
temperature control. adjuster/sensor should be mounted on an internal wall at a height of approximately 1.5 meter in such a way that the room tempera­ture can be measured accurately.
Type Code no. Sensor Capillary tube Setting range FEV-IF 013G5467 Integrated sensor 5 m FEV-FF 013G5466 Remote sensor 2 + 2 m
17-27 °C
Heating: Floor-, ceiling-, or radiator heating
Heating circuit
FEV-IF
RA-C RA-N/G
Heating: fancoils/induction units
Heating circuit
FEV-FF
RA-C RA-N/G
DKCD VD.33.R1.02 © Danfoss 01/2000 1
Data sheet FEV sensors
FEV sensor design
Valve adapter (heating)
Remote temperature adjuster
Remote sensor (FEV-FF)
Actuator
Temperature setting
FEV sensors can be applied in combination with RA-N RA-G or RA-C valves. The FEV sensors are equipped with a direct acting valve-controller that opens the valve when the
Comfort temperature ~ 22°C at Xp = 0 K(°C)
The FEV sensors have been developed for heating via water-based systems.
The FEV sensors are based on the self-acting principle. The liquid-filled sensors control the valves via capillaries and adapters.
temperature drops below the set temperature. If the set temperature is equal to or higher than the room temperature the valve is closed.
The scale shows the approximate set-point offset from the comfort temperature which is approximately 22° C at X
= 0 K.
p
2 VD.33.R1.02 © Danfoss 01/2000 DKCD
Data sheet FEV sensors
Temperature control through heating with FEV
Example
Control area of FEV sensor with RA-N/G and RA-C valve
Xp = 0 K
Xp = 2 K
When the knob has been set in the middle position the valve will open at temperatures
Heating with FEV thermostat
lower than 22°C. A setting in the red zone means the valve will open at a higher room temperature. A setting in the blue zone means the room temperature will be kept at a value lower then 22 °C.
Lowering comfort temperature by 4 °C
Waterflow, heating
Setpoint on knob
Water flow, heating
Limiting the set tempera­ture of FEV sensors
The comfort temperature is lowered by 4°C by turning the knob to a setting in the blue area. Because the scale is calibrated at Xp=0 K(°C) the valve will open when the temperature drops below 18 °C. In the presetting “N” of the valve the combination FEV/RA works with a P-
The set temperature of the remote tempera­ture adjuster depends on the sensor type and the valves, which are used with the sensors.
MIN.
band of approximately 2 K (°C). This means
the valve will be fully open and the flow maxi-
mal when the sensor reaches a temperature
of approx. 16 °C (18°C minus 2 K).
It is easy to limit or lock the set temperature
by means of the built-in locking/limiting de-
vice.
Maximum limitation of temperature areaMinimum limitation of temperature area
MAX.
DKCD VD.33.R1.02 © Danfoss 01/2000 3
Data sheet FEV sensors
Design
1. Heating adapter
2. Actuator
3. Adjustment bellows
4. Capillary reel
5. Remote temperature ad­juster
6. Bellows
7. Remote temperature sensor (FEV-FF)
Dimensions
FEV-IF
FEV-FF
VD.33.R1.02 © Danfoss 01/2000 DKCD
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