Data Sheet
FED-W Sensors - Sequence Control of Cooling and
Heating Circuit
Products
FED-W 10 with integrated sensor |
FED-WF 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-W and FED-WF sensors can be applied to chilled ceilings, fancoils or induction units.
For control of cooling and heating circuits in fancoil and induction units use the FED-WF with remote sensor.
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. |
|
|
|
|
|
|
|
|
|
|
FED-W 0.5 |
Integrated sensor |
0.5 m |
|
|
|
013G5481 |
|
|
|
|
|
|
|
|
|
FED-W 10 |
Integrated sensor |
10 m |
|
17-27 °C |
|
013G5480 |
|
|
|
|
|
|
|
|
|
FED-WF |
Remote sensor |
2 + 2 m |
|
|
|
013G54xx |
Application |
|
|
|
|
|
|
|
Sequence control of 4-pipe chilled ceiling or radiator |
|
|
|
|
|||
|
|
|
|
1. |
RA-C |
|
|
|
|
|
|
2. |
FED-W |
|
|
|
|
|
|
3. |
RA-N |
|
|
|
|
|
|
4. |
Cooling circuit |
|
|
|
|
|
4 |
5. |
Heating circuit/radiator |
||
|
|
1 |
|
|
|
|
|
|
|
2 |
|
|
|
|
|
5
3
Danfoss Heating Solutions |
VDUND202 |
© Danfoss |
02/2011 |
1 |
Data Sheet |
FED-W Sensors - Sequence Control of Cooling and Heating Circuit |
|
|
Sequence control of fancoils and induction units
1. RA-C
2. FED-WF
3. RA-N / RA-N
4. Cooling circuit
5. Heating circuit
4
1
2
5
3
FED Sensor Design
1
1. Cooling adapter
32. Actuator
3.Remote sensor (only FED-WF)
4.Capillary reel (only FED-W 10)
5.FED-W sensor
2
4
5
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 open when the temperature rises above the setpoint temperature.
The valve in the heating circuit will open when the temperature falls below the setpoint temperature.
2 |
VDUND202 |
© Danfoss |
02/2011 |
Danfoss Heating Solutions |
Data Sheet |
FED-W Sensors - Sequence Control of Cooling and Heating Circuit |
|
|
Temperature Setting |
Comfort temperature ~ 22 °C at Xp = 0 K |
||
|
|
|
|
Sequence Control |
The control is done by the sensor, in which a |
|
neutral zone is built-in. In the neutral zone both |
|
valves are closed and neither an activation of the |
|
valve in the heating circuit nor of the valve in the |
|
cooling circuit takes place. In that 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. |
|
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. |
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 shows the approximate set-point offset from the comfort temperature which is approximately 22° C at Xp = 0 K.
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
1
2
Irrespective of the temperature setting of the |
1. |
Adjustment of the neutral zone |
FED-sensor the necessary neutral zone will |
||
always be kept. See also figures below. |
2. |
Factory setting mark |
Setting of comfort temperature – hotter t1 –> t2 (e.g. 22 °C –> 24 °C)
Danfoss Heating Solutions |
VDUND202 |
© Danfoss |
02/2011 |
3 |
Loading...