Installation and
Operating Instructions
Radio Thermostat
INST
U 468 931 003 364-1
╞
1 Application
2 Features
3 Function description
3.1 Control mode
3.2 Function of indicator lamp
3.3 Battery change
4 Installation
5 Commissioning
5.1 Performance testing
5.2 Replacement of a receiver without re-learning
of transmitters
6 T
7 Short form operating instructions
8 Application examples
9 Dimensions
Subject to change without notice
Note:
In some rare cases it may not be possible to esta-
blish a permanent radio link between the radio
transmitter and the radio receiver
We therefore recommend that the reliability in ope-
ration at the specific location should be checked.
In order to establish bigger transmission distances
(up to 90m) or in case of critical locations, the RF
repeater INST
1 Application
The electronic INST room temperature con-
troller (radio transmitter) may be used to control the
room temperature see fig 8.:
It is designed to provide control for
• oil and gas hot-water heating systems
• actuators for radiator heating
• electric floor or direct heating
• circulating pumps
An INSTradio receiver is required for oper-
ation.
2 Features
• No controller wiring-up required
• Very simple operation by means of adjustment knob
• a transmitter can control any number of receivers
• self-learning address setting
• Easy replacement of a receiver without re-learning of
transmitters
• transmitter suitable for all INSTA receivers
• power supply via 2 commercially available batteries
• Housing: pure white in the new EBERLE 2000 design
3 Function description
The INSTroom temperature controller de-
tects an actuating signal independently of a variable set
temperature. This signal is transferred to a radio recei-
ver by radio data transmission (INST. The fi-
nal control elements for heating and cooling applicati-
ons are switched by means of this receiver (230 V). The-
re are plans to use the transmitting frequency used all
over Europe for that type of application.
The transmitting power is very low. It is far below the po-
wer of a mobile telephone. Moreover
activated only every 10 min.
The transmission quality is enhanced by employing spe-
cial test procedures and repeating transmissions. T
mitter and receiver are tuned to each other by making
use of the “learning mode”.
3.1 Control mode
Fuzzy mode with PWM:
This mode is very similar to a continuous-action control.
It is particularly suitable for electrothermal actuators, el-
ectric heaters and pumps.
The controlled variable calculated from the difference
between set and actual temperature is displayed as a va-
riable pulse-pause-ratio (pulse width modulation =
PWM).
The sum of pulse and pause times is constant and equals
10 min. In the case of larger temperature differentials,
the controller switches permanently on or off
The control algorithm used attempts to keep the room
Pulse-Pause-Ratio
Behaviour of Puls-Pause-Ratio
according to T
100%
continuously on
control value
0%
continuously off
Output signal
10 min 1 10 min 10 min
Setpoint Temperature
temperature constant without taking account of the
switching differential. For that purpose it is necessary
that heat be called (however
the set temperature has already been reached.
3.2 Function of indicator lamp
The following functions are indicated by means of this
lamp:
Learning mode is lit during the learning mode
Battery weak short flash every 15 sec.
After reset short flash
(sign of proper functioning)
3.3 Battery change
If the indicator lamp lights up briefly every 15 sec., the
batteries must be changed within the next few days (un-
der the hinged lid).
Observe correct polarity
Please use the type of battery specified under section 6.
“T
its life.
Following a replacement of batteries, the controller will
continue to operate.
4 Installation
The temperature sensor can be arranged within the
room where it is considered best by the user
for perfect temperature control it is reasonable to ar-
range the sensor at a position 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
– permits safe radio transmission
– is not in the vicinity of e. g. a radio receiver
vision set or a radio transmitter
– is not in the vicinity of metal parts e. g. metal doors,
metal cupboards, mirrors or steelreinforced con-
crete
– if unsure, check radio transmission before installa-
tion (see receiver instructions, section “Radio ran-
ge test”), look for suitable position if necessary
Installation is to be carried out in the following
sequence:
• remove temperature adjustment knob
• loosen retaining screw
• remove housing top
5 Commissioning
Upon installation, a connection must be made between
controller (transmitter) and receiver
amples, see receiver instructions.
T
1. Activate “learning mode
2. Activate “learning mode” on the transmitter as follo-
ws (below lid):
a) Hold the ì-button depressed.
b) Briefly press the reset button.
c) When the indicator lamp lights up, release the ì-
button. When the connection has been succes-
sfully made, the indicator lamp automatically ex-
tinguishes (after approx. <1 min.).
d) Press the reset button on the transmitter
will terminate the “learning mode” and the indi-
cator lamp will extinguish.
Note:
Activating learning mode will create a new address, all
revceivers linked to that transmitter need to be re-lear-
ned. Easy replacement of a receiver see 5.2
The transmitter exits the learning mode after 10 min.
5.1 Performance testing
After pressing the reset button, the transmitter changes
to testing mode for 15 sec. If the link is corect, the lamp
on the receiver will blink.
In the case of inexplicable malfunctions, the reset but-
ton should be pressed.
Manual activation of receiver output
Switching on:
Set a temperature of 30
Switching off:
Set a temperature of 5
5.2 Replacement of a receiver without re-learning
of transmitters
The method described here offers the benefit, that the
actually used address will be continued to be used.
Only the replaced receiver needs to be re-learned.
T
1. Activate “learning mode” on the receiver (see there).
2.
ws (below lid):
a) Hold ì button depressed for > 8 Sec.
b) When the indicator lamp lights up, release the button.
When the connection has been successfully made, the
indicator lamp automatically extinguishes (after <1
min.).
c)
terminate the “learning mode” and the indicator
lamp will extinguish.
6 T
Order No. INST
EDP No. 0536 11… / 0536 12...
T
INST 5…30
INST 17…24°C
Operating voltage battery: 2 microcells
alkaline (LR03), 2 x 1,5 V = 3 V
Battery lifetime approx. 3 years
Control mode fuzzy logic with PWM
PWM cycle time approx. 10 min.
(sum of on and off times)
Measurement interval approx. 10 min.
Indicator lamp see 3.2
Function of indicator lamp
T in the controller
Carrier frequency 868,95 MHz
Modulation mode FM
Antenna internal
T <10 min.
(radio data transmision several times)
T 100 m free air or
1 ceilings or 3 walls respectively
Degree of protection IP 30 (moisture
provided by enclosure condensation not permitted)
Class of protection III
Software class A
Degree of pollution 2
Operating temperature –25
Storage temperature –25
Range narrowing in adjustment knob
Weight (without battery) approx. 100 g
8 Application examples
Fig. 1: One transmitter controls one receiver
INSTA
INSTA
The temperature controller is now ready for
operation. When testing the radio transmissi-
on, please observe also the relevant receiver
instructions.
9 Dimensions
7 Short form operating instructions
See
Preparatory work • Insert battery
4 • Install controller
Make radio link 5 1. Hold ì button depressed
2. Briefly press reset button
3. When indicator lamp lights up, release ì button
4. When the radio link has been succesfully made,
(when the lamp went out at the receiver)
press reset button
Switch receiver output 5.1
– output ON • set a temperature of 30 °C, wait for 30 sec.
– output OFF • set a temperature of 5 °C, wait for 30 sec.
Replacement of a receiver without
re-learning of transmitters 5.2 1. Hold ì button depressed for > 8 Sec
2. When indicator lamp lights up, release button
When the radio link has been succesfully made
(When the lamp went out at the receiver).
3. Press reset button.
Check for correct operation Press reset key ➝ LED lights up briefly
➝ receiver switches 3 times shortly on
This thermostat can be used in all EU and EFT
countries.
The manufacturer herewith declares that the
device complies with the basic requirements and
all other relevant regulations of the R&TTE
1999/5/EG directive.
The declaration of conformity can be downloa-
ded from „www.funk868MHz.de“.
