1. Applications
The easy 3s electronic clock thermostat is designed for
room temperature control in conjunction with:
•
heating systems, e.g. hot-water heaters, convector hea-
ters or floor heating
•
electric convector heaters, ceiling and storage heating
•
night-storage heaters
•
chillers
•
circulation pumps
•
burners and boilers
•
heat pumps, etc.
•
airconditioning applications (cooling only)
Features
•
very simple operation
•
comfort and setback temperature adjustable
•
5 operating modes (by rotary switch) for:
➩ permanent comfort temperature (5…30°C)
➩ permanent setback temperature (5…30°C)
➩ clock mode (automatic)
➩ frost protection (5°C fixed)
➩ OFF
•
Indicator lamps for: ➩ heat demand
➩ setback mode
•
available with daily or weekly timer
•
control by phone remote switch possible
•
output signal PWM or ON/OFF regulation (adjustable via
jumper)
•
relay output, 1 x changeover contact
•
remote sensor optional
•
emergency operation at sensor failure
•
hinged cover
•
new design 2000
2. Function description
The clock thermostat is designed to control the room tem-
perature.
In the automatic mode, a changeover is effected between
comfort and setback mode by the built in timer.
Optionally remote sensor can be used instead of built-in
sensor.
In setback mode the green indicator lamp lights up.
If room temperature drops below set value, heating will
start, the red indicator lamp will light up.
Indicator lamps
Red indicates when controller demands heat,
Green indicates when setback mode is activated.
Red flashing for failure. Operating voltage to be swit-
ched OFF and ON again.
Controller heat demand at PWM
If room temperature drops below the set value, heating
mode will start. The controller output is in the form of pul-
ses of varying length (PWM). The length of the pulses
depends on the difference between set and actual room
temperature.
The sum of pulse and pause times can be selected with
J4 (between 10 or 25 min.).
If there are large temperature differences, the controller
will switch ON or OFF permanent, e.g. when changing
over to temperature setback mode. PWM should only be
used for current ≤ 10A
Fig.1: Characteristic of impulse pause ratio depending on temperature
Cycle time setting
For inert applications (e.g. burners) we recommend the
long cycle time.
For quick applications (e.g. electric direct heaters) we re-
commend the short cycle time.
Plug-in jumper J4 Time
(right side of board)
Double-pole jumper 25 min
connection (as-delivered condition)
Single-pole jumper 10 min
connection
Heat demand of the controller at ON/OFF regulation
When room temperature drops below set temperature the
output will be switched on, whereas it will be switched off,
when set value is exceeded.
Fig. 2: ON/OFF regulation
Plug-in jumper J3 Regulation
(right side of board)
Double-pole jumper ON/OFF
connection
Single-pole jumper PWM
connection (as delivered condition)
Phone remote switch (only available at special variants)
Via an external phone switching device the conroller can
be put into mode of comfort or setback temperature. As
long as contact (terminal 19) is closed, the comfort tem-
perature will be “used“. This function ist activated in the
modes 2 automatic, Ñ setback temperature permanent
and P Frostprotection.
3. Installation
The controller should be arranged in a place within the
room which:
• is easily accessible for operation
• is free from curtains, cupboards, shelves, etc.
• enables free air circulation
• is free from direct sun radiation
• is free from draughts (e.g. opening of windows and doors)
• is not affected directly by the source of heat
• is not located on an external wall
• is located approx. 1,5 m above floor level
Mounting directly on conduit box or with adapter
frame ARA easy.
Electric connection
Warning! Disconnect electric circuit from supply.
Proceed as follows:
• pull off temperature setting knob
• push retaining hook outwards using screwdriver
• remove housing cover
• make connection in compliance with wiring diagram (see
housing cover).
• watch notes
Remote sensor
Having connected the remote sensor, the integral sensing
component will be switched off automatically.
The sensor cable is extendable up to a length of max.
50 m. Please use a two-core 230 V cable with a cross sec-
tion of 1.5 mm
2
.
The sensor cable (F 193 720) should be installed into a
protection tube (pocket). This facilitates later replacement.
In case of failure (break or short-circuit) the controller swit-
ches into emergency operation:
at PWM: 30% heating capacitiy
at ON/OFF: Relay OFF
Warning! Sensor cables carry operating voltage.
4. Technical data
Temperature setting range:
comfort temperature 5…30°C
setback temperature 5…30°C
frost protection approx. 5°C fixed
Regulation proportional controller
(due to PWM quasi-continuous, see Fig.1)
Cycle period adjustable 10 or 25 min.
(sum of PWM ON and OFF times)
Proportional band 1,5 K
Hysteresis ~0,5 K, ≤ 10 A see Fig. 2
~0,5K at 16 A and use with remote sensor
~2,5 K, at 16 A without remote sensor
ON/OFF regulation adjustable via jumper
Output relay, 1 volt-free* changeover contact
Switching current 10mA…16 A cos ϕ = 1
max. 4 A cos ϕ = 0,6
max. 10 electro-thermal actuators
Switching voltage 24…250 V AC
Mode selector switch comfort / automatic / setback /
frost protection / OFF
Phone remote switch Input for 230V AC (via an external
(as variant) phone switching device)
Indicator lamp: red controller demands heat
green setback mode
Temperature sensor: internal
Remote sensor type F190021 (wall mounting)
type F 193 720 length 4 m
both extendable up to 50 m
Sensor characteristics 42 kΩ at 20°C
26 kΩ at 30°C
Range limitation inside setting knob
Clock:
accuracy < 10 min./year
switching time setting every 15 min. with daily timer
every hour with weekly timer
power reserve approx. 100 h
Protection class of housingIP 30
Degree of protection II (see Warning 1)
Ambient temperature –10…40°C, without condensation
Storage temperature –25…65°C
Dimensions 160 x 80 x 36 mm
Weight approx. 220 g
* The volt-free contact of this mains-operated unit does not ensure
the requirement for the use of safety extra-low voltage (SELV).
For units with 230 V supply voltage
Type easy 3st with daily timer
easy 3sw with weekly timer
Article-Nr. easy 3st 517 2701 51 100
easy 3sw 517 2702 51 100
Operating voltage 195…253V AC 50/60 Hz
Power consumption < 1,5 W
For units with low voltage output
Type easy 3st 1mA with daily timer
easy 3sw 1mA with weekly timer
Article No. easy 3st 1mA 517 2711 51 100
easy 3sw 1mA 517 2712 51 100
Operating voltage 195...253V AC 50/60Hz
Switching current >1 mA, >1V or max. 10(4) A AC
Power consumption < 1,5 W
5. Wiring diagram
Symbol explanation
U Heaing P Cooling Remote sensor
☎
Phone remote switch
Note
For heating applications
• connect n/c actuators to terminal 2.
• connect n/o actuators to terminal 3.
For cooling applications
• connect n/c actuators to terminal 3
• connect n/o actuators to terminal 2
• To use the red lamp as indicator for “cooling ON”,
connect n/o actuators to terminal 2
• When mode selector switch is in OFF position n/c
and n/o actuators will be closed logically.
6. Operation
Temperature setting
Comfort temperature (daytime temperature)
is set by means of externally visible seting knob (1)
Setback temperature (night temperature)
is set by means of adjustment knob (2) beneath cover.
Time setting
by putting one finger on dial (3) and turning in any
direction, you can set the time.
Arrow (4) points to the selected time.
Switching time setting
Bring movable tappets (5) into required position using
a pointed object.
Outer ring = comfort temperature
Inner ring = setback temperature
Mode selector switch (6) – externally
É Comfort temperature, permanent
2 Automatic mode, time-controlled changeover
between comfort and setback temperature
Setback temperature, permanent
P Frost protection, permanent (5°C)
OFF, there is no control activity. The controller itself is
not disconnected from operating voltage.
