Installation and Operating Instructions
U 468 931 002 933-01
Installation and
Operating Instructions
Radio receiver
INSTAT 868-a1...
2. Features
The radio receiver may be installed only by a specialist in
compliance with the circuit diagram enclosed in the top
housing cover or in compliance with these instructions.
The current safety regulations must be observed.
In order to achieve class of protection II, adequate installation measures must be taken.
This radio receiver which can be installed separately, is
designed exclusively for temperature control in dry and
closed rooms and standard environments. The radio receiver has radio interference suppression in accordance
with VDE 0875 and EN 55014 and operates in accordance with IC (EN 60730).
Errors possible / Subject to alterations.
1. Use
2. Features
3. Function description
3.1 Basic Functions
3.1.1 Function - 1, - Switching mode
3.1.2 Reversing the control action
3.1.3 Deleting the radio links
3.1.4 Identifying active links
3.1.5 Testing the radio link range
3.1.6 System demonstration
3.1.7 Signal lamp function
3.1.8 Jumper function
3.2 Enhanced functions
4. Installation
5. Commissioning
5.1 Establishing the radio link
5.2 Valve test
5.3 Power failure
5.4 Quit/Reset
5.5 Faults
5.5.1 Double addressing
5.5.2 Short time losses of the transmission signal
5.5.3 Long time losses of the transmission signal
5.6 Troubleshooting
6. Technical data
6.1 Technical data INSTAT 868-a1A, relay 16 a
6.2 Technical data INSTAT 868-a 1mA,
relay 200 mA
6.3 Technical data INSTAT 868-a1T, Triac
7. Dimensions
8. Wiring diagram
9. Examples
10. Short form instructions
1. Use
Receiver for INSTAT 868-r… (radio transmitter)
for switching:
● actuators of radiator heaters
● heating systems with switching applications
● circulating pumps (decentralised pump control)
● etc.
Volt-free switching (relay version) of:
➱ 24 ... 250 V AC loads
➱ 5 V ... 250 V UC low-voltage current signals
Noiseless switching of 230 V AC (0,8 A) by means
of a Triac (non-volt-free)
Output functions (optional):
➱ Heating ON/OFF
➱ Temperature setback ON/OFF e.g. for boilers or
other controllers
➱ Pump control for up to 6 transmitters, extendable
Reversing of control action for:
➱ connecting actuators “currentless open” instead
of “currentless closed”
➱ changing from summer to winter mode (cooling
instead of heating)
Valve test function
Radio test and system demonstration
One transmitter can control several receiver
Self-learning address settings through “Learning
mode” in the transmitter
button for setting of functions
Reset button
Signal lamp indicates initial state, faults etc.
Monitoring of valid radio link
Audible signal in case of faults (can be switched off)
Emergency operation in case of loss of radio link
3. Function description
The INSTAT 868-a1 receiver converts radio signals
received from a transmitter, e.g. INSTAT 868-r … into
control signals for loads. The loads are switched by
means of a relay or a Triac.
The switching state of the output is indicated by a
signal lamp.
For switching characteristics, see Installation instructions for the transmitter under item “Function description”. For controlling the electric loads, the output can
be configured in different ways.
3.1 Basic Functions
3.1.1 Function - 1, - switching mode “One transmitter controls one switching
One transmitter controls the output for heating/ cooling ON/OFF.
This function is active, if jumper BR 1 is closed.
For heating systems, which are in stand by mode during summer time (e.g. electric heating), the valve protection has to be switched off (in the transmitter). If the
valve protection is not switched off, a daily 3 min.
heating will take place.
3.1.2 Reversing the control action
The switching characteristics of the output and the
signal lamp are reversed in respect of all functions
(also pump control). Due to this feature, the following
functions can be implemented.
● connecting actuators “currentless open”
● changing from summer to winter mode (cooling instead of heating)
For cooling (summer mode) or actuators “current
less open”:
single-pole plugging of BR 1 jumper (One-pole
plugging prevents loss of jumper)
For heating (winter mode) (= as delivered condition)
double-pole plugging BR 1 jumper .
3.1.3 Deleting the radio links
To delete all radio links and functions or to select a different function in compliance with sections 3.1 to 3.4:
1. Press the z button and the ”Reset” button simultaneously
2. Release the “Reset” button, then the z button
3. Press the “Reset” button.
Only during subsequent programming of the first new
link all other links and functions are deleted.
3.1.4 Identifying active links
After pressing the “Reset” button, the programmed
links are indicated by brief flashing.
Several links are indicated by repeated flashing.
3.1.5 Testing the radio link range
To determine the radio link range, follow this:
Set the transmitter to “Learning mode”:
1. Press the z button and the ”Reset” button simultaneously
2. Release the ”Reset” button first, then the z button
The signal lamp lights up. The signal tone and the
output operate in the switching mode, approx.
2 sec. ON, 8 sec. OFF.
3. Now, while holding the transmitter in your hand,
walk away from the receiver until you reach the
point where the signal tone is no longer audible and
the signal lamp stops flashing. This point is the
maximum possible radio link range.
4. Always terminate this function by pressing the
“Reset” button.
5. Quit the “Learning mode” on the transmitter
As far as a free transmitter is used, existing radio links
will not be affected.
All links must be reprogrammed on completion of
“Testing the Radio link range”.
3.1.6 System demonstration
To demonstrate the radio range, see section 3.1.3
“Testing the radio link range”. If necessary, a lamp can
be connected to the output.
3.1.7 Signal lamp function
The signal lamps provide the following information:
● Output state…
ON/OFF in a interval of 10 min.or
steady light may be possible
● Faults…
Blinking; Duration varies depending on type of fault
● Learning mode…ON until the link is established or
the Reset button is pressed
● Valve test…
ON as long as the “Reset” is
● Testing the
radio link range... Flashing, 10 sec. interval
● Monitoring of
after “Reset”
5. Commissioning
Before commissioning, delete all radio links as described under section 3.1.3.
BR 1 is closed
5.1 Establishing the radio link
On completion of the installation work, a link between
the INSTAT 868-r… transmitter and the radio receiver
must be established. To do this, follow this: (see fig. 1)
a) Set the transmitter to “Learning mode” (see
Operating instructions for transmitter)
b.1 For function-1, – switching mode –
activate “Learning mode” on transmitter (A) to do
this: press the z button briefly
A signal tone sounds, the signal lamp lights up
and the output is switched on briefly. When the
transmitter is recognised, the signal tone ceases
to sound and the signal lamp extinguishes.
b.2 For function-2, – pump control – proceed as
described under b.1. However, at least 3 transmitters must be programmed. If, for instance, only
one transmitter is to be used, then this one must
be programmed three times, without quitting the
“Learning mode” on the transmitter
b.3 For function - 3, – time switch –
proceed as described under b.1, this transmitter
must, however, be programmed twice, without
quitting the “Learning mode” on the transmitter
c. When the transmitter is recognised, the signal
tone ceases to sound and the indicator lamp
d. Terminate the “Learning mode” on the transmitter
e. Test the radio links which have just been established (see Table within section 5.6 for points 4, 5)
Before programming a second function or the reprogramming of the same function, execute the instructions in section 3.1.3 “Deleting the radio link.”
Fig. 1
One transmitter (INSTAT 868-r) controls one receiver.
INSTAT 868-r1
3.1.8 Jumper function
J1: open to reverse control action = cooling
J2: open to switch off the beeper
BR1: closed = only switching mode possible
open = all functions possible
One-pole plugging prevents loss of jumpers
INSTAT 868-a1
3.2 Enhanced Functions
The functions
● pump logic control
● Time switch (Maser/Slave)
● pilote output
are described in the additional manual „Enhanced
functions for 1 channel receiver INSTAT 868-a1, no.
468 931 012 739.
These functions are available by opening Jumper BR1.
Fig. 2
One transmitter (INSTAT 868-r) controls one receiver
INSTAT 868-r
4. Installation
Installation: e.g.
● In distribution board on DIN rail (by snap-on mounting SBF 3/6)
● Directly on the wall
● If necessary, on conduit box , by means of ARA 1S
Electrical connection
To make this connection, follow this:
● Loosen cover fastening screw
● Remove top part of housing
● Make the connection in compliance with the circuit
diagram (see top part of housing)
● If necessary, knock out penetration for actuator
drive cable (lower right-hand corner)
Make sure that the strain relief for the actuator drive
connection fits tight.
INSTAT 868-a1
Fig. 3
One transmitter (INSTAT 868-r) controls a couple of
INSTAT 868-a1
INSTAT 868-r1
INSTAT 868-a1
The radio receiver is not suitable for switching “safety
extra-low voltage” (SELV).
5.2 Valve test
When the z button is pressed:
● The output is switched on (as long as the z
button is pressed)
● The signal lamp lights up
● The signal tone sounds
After releasing the z button, the “Reset” button must
be pressed within 10 seconds. As a result of this, the
signal lamp extinguishes and the signal tone ceases
to sound. After 10 seconds, the “Learning mode”
starts; a link would be established to a transmitter
which happens to be in the “Learning mode”.
5.3 Power failure
If there is a power failure in the transmitter or in the
receiver, all data is saved. When power supply is
restored, normal operation is resumed.
5.4 Quitting / Reset
To – quit the “Learning mode”
– acknowledge a failure or
– terminate the Radio link range test or
– terminate the valve test
– in the event of any other inexplicable phenomena
push the “Reset” button. This restores the output to its
initial state (also reversed control action). When new
6. Common technical data
actuating signals are received (possibly after 10-20
min.), the output will return to its previous state. Any
existing radio link will be maintained.
5.5 Faults
If faults occur, an alarm is triggered. In this case, the
signal lamp flashes with varying duration, if necessary, a signal tone sounds.
5.5.1 Double addressing
In this case, the signal lamp shows a longer flash of
approx. 0.7 sec. ON, 0.3 sec. OFF. It is cancelled by
reprogramming one of the transmitters. The signal
tone sounds.
5.5.2 Short time losses of the transmission
If the transmitter fails to receive an actuating signal
within a period of 1 and up to approx. 10 hours, the
signal lamp blinks permanently one time. No signal
tone sounds.
When recurrence of the transmission signal, the
alarm automatically ceases.
5.5.3 Long time losses of the transmission signal
If the receiver has not received an actuating signal for
more than 10 hours, the signal lamp shows a permanent short flash. The signal tone sounds.
7. Dimensions
When the transmission signal recurs, the alarm automatically ceases to sound.
For all types of faults, the following applies:
● The output is switched with 30 % (3 min. ON,
7 min. OFF), this means heating with 30 % of
● FUNCTION 2: In the alarm mode the pump operates permanently (even if one transmitter has
failed to operate).
● In the case of heating units which are in a stand-by
mode in the summer, for instance, electric heaters,
the valve protection (in the clock thermostat) must
be switched off. Otherwise heating would take
place with 30 % capacity when a fault occurs.
● The signal tone can be switched off permanently
by removing jumper J2 (one-pole plugging
prevents loss of jumper).
● The flashing signal lamp indicates the alarm condition, not the control state
● After a power loss in the transmitter or in the
receiver, normal operation is resumed.
● Under unfavourable local conditions it is possible
that the radio link between the transmitter and the
receiver is insufficient, for instance, if the receiver
is arranged in an interference-proof metal housing.
Please check whether the situation improves when
the transmitter is arranged in a different position.
For checking the radio link, see section 3.1.7
5.6 Troubleshooting
1. Valve does not open:
➱ Has it been properly wired up?
➱ Has the radio link been established (see section
➱ See point 3 in the Table as well as point 4
➱ Press the Reset button (see 5.4)!
2. Signal lamp flashes and possibly a beeper is sounding
➱ For basic fault procedures, see 5.5
➱ “Learning mode”, valve test, radio range test
have not been interrupted! (see sections 5.1,
5.2, 3.1.7)
➱ Two transmitters are transmitting with the same
address; reprogram one of the radio links!
➱ No radio link, see point 7 in the Table.
➱ In the case of inexplicable faults it is recommended to press the “Reset” button on the receiver and, if necessary, on the transmitter (see
section 5.5.1)
If the radio link does not work, check the following:
Operating voltage
230 V AC (195…253 V)
50/60 Hz
Direction of action = normal = jumper BR 1 is plugged to two poles.
Check the following:
Power consumption
Approx. 12 VA
1. Receiver. Is power supply OK?
Continue with 2
Check fuse, if necessary
Operating temperature
0…+40 °C
–20 …60 °C
Transmission signal is
2. Receiver: Does the signal lamp flash?
Can the warning tone be heard?
(wait for an hour, if necessary)
Continue with 4
Storage temperature
for programming
for reset
3. Transmitter: Is the battery OK?
Continue with 4
Insert new batteries
4. Transmitter: adjust to 30°C. Is the output
switched on after approx. 30 sec?
(Lamp light up).
Continue with 5
The output was already
switched on. Continue with 5
or the transmission signal is
missing, continue with 6 or
wrong function, see 5.1
5. Transmitter: adjust to 5 °C. Is the output
switched off after approx. 30 s
(Signal lamp does not light up)
Everything OK
The transmission signal is
missing, continue with 6 or
wrong function, see 5.1
6. Transmitter-actuator-receiver: Check wiring, if
necessary, reprogram the connection to the
Radio receiver. Has the remedial action taken
under points 4 and 5 been successful?
Everything OK
Continue with 7, if necessary
check the Radio link range,
see section 3.1.7 “Testing the
radio link range”
7. Reduce the distance between the receiver and
the transmitter to approx. 2 m.
The thermostats are
working properly
Check environment for
other RF-signals!
The transmitter or the Radio
receiver are defective
Signal lamp
Protection class of housing
IP 30
(Moisture condensation
not permitted)
8. Circuit diagram
Class of protection
II*** (see page 1)
INSTAT 868-a1A / INSTAT 868-a1 mA (Relay)
Approx. 100 g
6.1 Technical data INSTAT 868-a1 A, relay 16 A
Model No.
INSTAT 868-a1A
0536 30…
Load circuit:
24 ... 250 V AC
Number of actuators
(3 W electrothermal)
230 V AC
AC 24 V
Relay, 1 NO contact,
16 A max. cos ϕ = 1
2 A max. cos ϕ = 0,6
Model No.
0536 35…
Load circuit:
5…250 V UC
Short form instructions for the radio receiver INSTAT 868-a
20 max.
8 max.
6.2 Technical data INSTAT 868-a 1 mA, relay 2.5 mA
Relay, 1 NO contact,
2,5 mA…200 mA cosϕ = 1
*) The volt-free contact of this mains-operated radio
receiver do not ensure the requirement for the use of
safety extra-low voltage (SELV).
**) The Triac is not protected. Overload or short circuit of
the load result in the destruction of the Triac.
Switching off the load is accomplished in zero current
flow Thus, a contactor can be controlled directly, without the need to take any additional measures.
***) Will be complied with, if the radio receiver is installed
on a level, non-conducting surface.
Absolutely trouble-free operation of the radio link
in accordance with the state-of-the-art technology is not always guaranteed.
Therefore, we recommend checking its proper
functioning at the respective place of installation.
RF approval has been obtained in the following
Germany, France, England, Netherlands, Norway,
Austria, Switzerland, Belgium, Luxembourg, Denmark, Sweden, Finland, Spain, Italy, Ireland,
Island, Portugal.
Delete the radio link
Test the radio range
Function 1
“Switching mode”
(Jumper BR1 has
to be closed)
Function 2
“Pump control”
Function 3
“Time switch”
Valve test
Press z button + “Reset” button simultaneously
After that, release z button
Press “Reset” button
Adjust transmitter to “Learning mode”
Press z button + “Reset” button simultaneously
After that, release “Reset” button and then the z button
Signal lamp lights up - signal tone + output
operate in the switching mode (short ON - long OFF)
Press “Reset” button for termination
Adjust transmitter to “Learning mode”
Briefly press z button
Signal tone sounds - signal lamp + output switch on briefly
Transmitter recognised - signal tone + signal
lamp extinguish
Like function 1
However, programme at least 3 transmitters or
programme the one transmitter 3 times
Like function 1
however, programme the one transmitter twice
Press the z button - output switches ON as long as z
button is pressed
Release z button + press “Reset” button within
10 sec. for termination
Summer mode (currentless open) J1 one-pole plugging
Winter mode (currentless closed) J1 double pole plugging
Brief losses of control signal (from 1 hour up to 10 hours)
Longer losses of control signal (more than 10 hours)
Double addressing - reprogram the radio link
Reversing control action
Signal lamp:
Blinking + signal tone sounds
Blinking + signal tone
Double blinking
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