Danfoss FED - IF, FED - FF Data sheet
Data Sheet
Cooling Circuit
Heating Circuit /
Radiator
RA-C
RA-C or
RA2000
FED-IF
Emitting Unit
RA-C
RA-C or
FED-FF
Remote
Cooling
Heating
Circuit
FED
Thermostatic Controller for
Cooling & Heating Circuits
Application:
Ordering Information:
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.
Code No.
013G5463
013G5462
Operator
FED-IF Integrated
Sensor
RemoteFED-FF
Capillary Tube
12 + 36ft
(4 + 11 m)
6 + 6 + 6 ft
(2 + 2 + 2m)
Setting Range
63 - 80 ° F
(17 - 27 ° C)
*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 chilled
ceiling and
radiator
VD33T222 © Danfoss 03/14
Control of
fancoils and
induction units
1
Data Sheet FED Thermostatic Controller for Cooling & Heating Circuits
Cooling Actuator &
Valve
Heating Actuator &
Valve
Induction Unit
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.
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 satised, 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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