Danfoss EFET 520 Operating guide

INSTRUCTIONS

Thermostat EFET 520

Function:

Thermostat EFET 520 is an electronic thermostat with a
built-in two-pole switch. 10 A.
Thermostat EFET 520 is used with a fl oor sensor or with
remote room sensor.
Thermostat EFET 520 is delivered with a 5ºC night
set-back element. NB! The night set-back element can be
activated by applying voltage to clamp 5.

Installation:

1. Thermostat EFET 520 can be mounted in a separate
box or in a combination system.

2. Detach the thermostat cover from the electronic part
by fi rst removing the setting button with a small screw­driver, and then removing the screw underneath, see
fi g. 1.

3. The contact arm must be in position 0 when dis­assembling and assembling the thermostat.
After reassembly the arm should be easily moved.

4. If the fl oor sensor is used it must be placed in a 16 mm

installation pipe which is sealed at the end.

5. Wire connection according to circuit diagram.

6. Make sure that the setting button can be turned after

remounting of thermostat cover.
NB! It is possible to preset a fi xed temperature range,

see fi g. 2.

7. Set the thermostat at the desired temperature.
Fine adjustment is necessary after a certain period.

8. To avoid cracks in the concrete fl oor you must make
sure that the fl oor is completely hardened before the
heating system is switched on.

9. 2-4 days will pass from switching on the heating
system until the temperature has stabilized at the set
value.

08095692 - 01.01 09-2003

Mark for dismounting
the tuner

520

Fig. 1

When dismounting the thermostat cover, tip out the setting
button with a screwdriver. Remove the screw under the cover.

2

Min.

520

Screw Max.

Fig. 2

The temperature range can be locked by moving the riders to
the desired position.

3