Danfoss FED - IF, FED - FF Data sheet

Data Sheet

FED

Thermostatic Controller for

Cooling & Heating Circuits

Application:

FED thermostatic controllers are used in

hydronic applications where both a

cooling and a heating circuit are

regulated by one controller. The FED is

FED - IF

available in two versions, FED-IF with

integrated room air sensor, and FED-FF

with a remote air sensor. Both the FED-IF

and the FED-FF are low cost methods of

controlling chilled ceilings, radiators, fan

coils, and induction units. In situations

FED - FF

requiring a faster response time, the FED

FF’s remote sensor can be placed

directly in the air stream providing an

option of mounting the dial directly on a

cabinet.

Ordering Information:

Code No.

Operator

Sensor

Capillary Tube

Setting Range

013G5463

FED-IF

Integrated

12 + 36ft

63 - 80 ° F

(4 + 11 m)

(17 - 27 ° C)

013G5462

FED-FF

Remote

6 + 6 + 6 ft

(2 + 2 + 2m)

*The cooling adapter is recommended to be mounted to the RA-C series of valves,

while the heating adapter can be mounted to either the RA2000 or RA-C series of

valves.

Application:

Control of

fancoils and

Cooling Circuit

Cooling

induction units

Circuit

RA-C

Emitting Unit

FED-IF

Heating Circuit /

FED-FF

Heating

Control of chilled

Radiator

Circuit

ceiling and

Remote

radiator

RA-C or

RA2000

Data Sheet	FED Thermostatic Controller for Cooling & Heating Circuits

FED Sensor Design: The FED sensor is equipped with a heating adapter and cooling adapter

(reverse device). Both are connected via capillary tubes to the remote temperature adjuster (dial). The reverse device will open the valve in the cooling circuit as the temperature rises above the set point temperature. Similarly, the heating adapter will open the valve in the heating circuit when the temperature falls below the set point temperature. With the FED-FF model an additional capillary tube from the dial connects to a remote temperature sensor.

Cooling Actuator &

Valve

Induction Unit

Heating Actuator &

Valve

Serial Coupling

A unique ability with the FED thermostatic operator is the interchangeability of the cooling and heating adapters. Out of the box, the FED sensor is assembled with the cooling adapter closest to the dial and the heating adapter further away. Yet this order can easily be exchanged and the FED sensor will still control in the right sequence. The interchange of valve adapters expands the possibilities of the dial placement.

Temperature Limitation

Incorporated into the dial is the unique ability to limit the rotation of the dial providing minimum and maximum limitation of the temperature settings. To set this limitation the front cover of the dial is removed exposing the setting tabs.

Temperature Setting:

When the dial is set to the center as shown in the illustration above, the thermostatic operator will maintain a comfort temperature of around 72°F (22°C). By rotating the dial to the red or blue side, the comfort temperature will be shifted as a result. In the state where room temperature is satisfied, neither the cooling nor the heating circuit would be opened. If the temperature rises above the set point temperature, the reverse device will cause the valve

for the cooling circuit to open. Likewise, if the temperature falls below the set point the cooling circuit will close and the heating circuit valve will open.

Built into the cooling adapter is a neutral zone (also known as a dead band) to ensure that both the heating and cooling valves do not operate simultaneously. The neutral zone has a settable range of 0.9°-4.5° (0.5°-2.5°C), and can be adjusted depending on the

2	VD33T222 © Danfoss 03/14

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