Contents:
1. Application
2. Features
3. Function description
3.1 Function – Switching mode –
3.2 Function – Pump logic –
3.3 Function – Time switch function –
3.4 Function – Master/Slave –
3.5 Heating/Cooling changeover
3.6 Deleting the radio link
3.7 Testing the radio distance
3.8 Identifying active radio links
3.9 Lamp function
3.10 Bridge function
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
5.6 Troubleshooting
6. Technical data
7. Dimensions
8. Wiring diagrams and examples
9. Brief operating instructions
1. Application
This module of the INSTAT 868-family converts the informa-
tion from a transmitter, e.g. INSTAT 868-r…, into control
signals for the loads.
2. Features
• Ready to plug-in, for immediate connection to a 230 V
conduit box
• 230 V actuators can be directly connected
• 24 V actuators switchable via volt free contacts (separate
transformer required)
• 4 receive channels in one housing
• or 3 receive channels and one output for pump logic, e.g.
for switching off the circulating pump when all valves are
closed
• or 2 receive channels, each with one associated time switch
output
• Master/slave function (master dictates switching times)
• Changing Heating/Cooling mode
• Valve test function
• Radio link test and system demonstration
• One transmitter can control several receive modules
• Self-learning address setting due to ”Learning mode“ in the
transmitter
• One push-button per output for setting functions
• One signal lamp per output to indicate relay status, faults,
etc.
• One reset button
• Acoustic signal in case of faults
• Monitoring valid addresses
• Monitoring the transmitter (if no signal has been received
from the transmitter for an extended period of time, for in-
stance, when the battery is empty, the output is switched on
for 30% of the time and the signal lamp flashes).
Warning!
This unit must not be opened and installed except by au-
thorized persons and in compliance with the circuit dia-
gram provided on the pcb. It is mandatory in all work on
the unit to observe the current safety regulations.
In order to classify for protection class II it is necessary to
take adequate installation measures.
This separately mounted unit is designed for temperature
control exclusively in dry and closed rooms with standard
environment. This electronic device is created according
EN 60730, it is working according operation principle 1C.
3. Function description
The INSTAT 868-a4 receiver converts radio signals from a
transmitter, for instance, INSTAT 868-r, into control signals
for loads. The loads are switched by means of a relay with
changeover contacts. The switching condition is indicated by
the respective signal lamp.
For relay switching characteristics, see Installation instruc-
tions for the transmitter under Item “Function description“.
For controlling loads, the output can be configured in differ-
ent ways. The functions subsequently listed can be combined
in an INSTAT 868-a4.
3.1 Function – Switching mode –
“One transmitter controls one
switching output“
Up to 4 transmitters control one output each (channels 1…4)
for heating ON/OFF (possibly, channel 4 lights up, see Sec-
tion 3.2). One or more actuators can be connected to each
output. For example, see Fig. 1.
3.2 Function – Pump logic –
Up to 3 transmitters control one output each (channels 1…3)
for heating ON/OFF. Channel 4 output serves as a common
pump logic output.
The pump is switched off, LED 4
extinguishes (if none of the
available transmitters has not called for heat (for more than
approx. 10 minutes). The pump is switched by the break
contact of the relay. This means that “emergency operation”
of the heating system is possible in the event of a power fail-
ure if ”normally open” actuators are used.
By parallel connection of the channel 4 outputs, the pump
logic can be extended to several receiving modules. To avoid
short circuits in the slave units, remove bridges BR 4, BR 5.
Supply slave units via terminal 7, 8 of the master unit, see
Fig. 2.
This function is always activated, as long as channel 4 is not
pro
grammed to a transmitter.
Reactivation is possible only via Item 3.6 ”Delete radio links”.
3.3 Function – Time switch output –
”One transmitter controls one switching and
an associated time switch output”
(Not possible with INSTAT 868-r1)
One transmitter controls one output for heating ”ON/OFF”
and one time switch output for temperature setback. Two
adjacent outputs respectively are combined to form pairs,
the one with the lower number switches the actuator, the
one with the higher number serves as a time switch output,
see Fig. 3.
The time switch output switches ”ON” if the controlled tem-
perature t
3
(night) is active on the transmitter and the warm-
up period has not yet started.
This output can, for instance, be used to control the tempera-
ture setback input for other controllers. Outputs which are
not used for temperature setback, can be freely assigned to
other transmitters. The time switch function is independent
of the transmitter operating mode.
For ‘party’ and ‘manual operation’ in the transmitter, the
switching times of the weekly program apply. In frost protec-
tion the time-switching output is always active If the daily
program is active, its respective switching times apply.
3.4 Function – Master/Slave –
In the case of this function, the slaves follow the master
switching times.
Master/Slave is activated, if:
Channel 1 = Master
(INSTAT 868-r, clock thermostat)
Channels 2…4 = Slave (INSTAT 868-r1)
Only slaves in the automatic mode follow the master.
Only one master is possible. It must always be assigned to
channel 1
. If other INSTAT 868-r are assigned to higher chan-
nels, these do not follow the master (the slaves do). In case of
masters failing, the slave receive channels provide control to
the comfort temperature, set on the slave controllers. For ex-
ample, see Fig. 4. Party- and manual mode of the master has
no influence to the slaves
3.5 Changing Heating/Cooling mode
With this function the INSTAT 868-a4 can be used for heating
or for cooling. The switching behaviour of all outputs will be
reversed (in case activated pump logic will be maintained
without reverse). The function ”time switch“ ist not reversed.
For cooling mode (summer time)
1. Button at channel 3 and ”reset“ button pressing at the
same time.
2. At first release button ”reset“ then button ”channel 3“
For heating mode (winter time) (as delivered condition)
1. Button at channel 4 and ”reset“ buttton pressing at the
same time.
2. At first release button ”reset“ and then button ”channel 4“
3.6 Deleting the radio link
To delete all radio links:
1. press push-button at channel 1 and reset button simulta-
neously.
2. release reset button first, then channel 1 push-button.
This deletes all radio links.
Any necessary links must be established new (see Item 5.1).
Now, after having pressed the reset button, none
of the
lamps must light up briefly see 3.8..
3.7 Testing the radio distance
To determine the distance of the radio link, the following pro-
cedure has to be followed:
On the transmitter:
Set the transmitter to Learning mode
Then on the receiver:
1. Press the channel 2 push-button and reset button simulta-
neously.
2. Release the reset button first, then the channel 2 push-
button.
Channel 2 signal lamp lights up. The signal tone and the
relay operate in the switching mode., approx. 2 sec. ”ON”,
approx. 8 sec. ”OFF”.
Now, while holding the transmitter in your hand, walk
away from the receiver until you reach the point where
the signal tone can no longer be heard and the relay is
about to stop operating. This is the maximum possible ra-
dio link distance.
After a certain period, the transmitter automatically ceases to
operate in the ”Learning mode”. Always terminate the radio
link test in the receiver by pressing the reset button.
Any other channels are not affected by the radio test.
3.8 Identifying active radio links
Having pressed the reset button, the programmed channels
are indicated by the respective channel lamps briefly lighting
up.
3.9 Lamp function
The signal lamps provide information about the respective
channel:
• Heating ”ON/OFF” In normal operating mode, steady
light is possible
• Faults Flashing, 1 sec. interval, number varies
depending on type of fault s. 5.5
• Learning mode Permanently ”ON”
• Valve test ”ON” until push-button is pressed
• Radio test Flashing, 10 sec. interval
3.10 Bridge function
BR 1: Opening for switching beeper OFF (single-pole
plugging prevents loss of bridge)
BR 4, 5: Opening for double-pole insulation of the supply
voltage from the switching voltage
see wiring diagram
4. Installation
Mounting: for instance
• In the distribution board on DIN rail
• In the heating circuit distributor on DIN rail
• Mounting position: any
• The unit must not have contact with water.
Electrical connection of operating voltage:
Insert plug into conduit box. If a direct connection is re-
quired, cut the plug off and clamp the wires.
Connecting the actuators:
Before inserting the cables, make a hole in the nipple using a
round, pointed object.
Electrical connection:
(switch off mains supply)
See diagram on the printed circuit board and Item 8. In the
as-supplied condition, the unit is designed for switching
230 V actuators. The actuators are simply connected to the
terminals (a-c [normally-open] and b-c [normally-closed]) of
the respective channels by means of both leads (terminals 7,
8 are not connected).
For switching a second voltage of up to 230/400V max.
(also for 24 V actuators):
Remove bridges BR 4 and BR 5 com
pletely.
The second voltage is fed via terminals 7, 8 (between chan-
nels 2 and 3). Example, see Fig. 3.
By removing bridge BR 3, channels 3 /4 can be operated with a
voltage different from that of channels 1/2 (via terminals 7, 9).
Note:
Having removed
bridge BR 3 channels 3/4 remain connected
as a single-pole connection to channels 1/2.
Volt free contacts with the required safety clearance can only
be obtained after com
plete removal of bridges BR4, 5
A suitable transformer is required for 24 V.
5. Commissioning
Delete all channels before commissioning, see Section 3.6.
5.1 Establishing the radio link
On completion of the installation work, a link between the
INSTAT 868-r… transmitter and the respective output (chan-
nels 1…4) must be established.
This must be carried out in the following sequence:
a) Set the transmitter to learning mode (see Transmitter
operating instructions)
b) 1. For function – switching mode –.
Set the required switching output of the receiver to
learning mode. To do this:
Briefly press the push-button for the desired output. A
signal sounds, the associated signal lamp lights up and
the output switches ON briefly.
When the transmitter is identified, the signal tone ceases
to sound and the associated signal lamp switches off.
2. For function – pump logic –
As with b1, however, a transmitter
must not be assigned
to channel 4.
3. For function – time switch output –
Set the desired switching output of the receiver and the as-
sociated time switch output to learning mode. To do this:
press both the push-button for the desired switching
output (channels 1,3) and the push-button for the time
switch output (channels 2,4) (e.g. press 1, 2). A signal
sounds, the associated two signal lamps light up and the
two outputs switch on briefly.
c) When the transmitter is identified, the signal tone ceases
to sound and the associated signal lamps extinguish.
d) T
erminate the learning mode on the transmitter
e) Testing the established radio link, see Section 3.8.
It is not possible to assign one transmitter to several outputs
in the same unit. However, one transmitter can control sever-
al outputs in different receiving modules. To establish the ra-
dio link, only one transmitter must be in the learnin
g mode.
5.2 Valve test
When the push-button of an associated output is pressed:
• the associated output switches ON (as long as the push-but-
ton is pressed),
• the signal lamp lights up,
• the signal tone sounds.
After releasing the output button, the reset button must be
pressed within 10 sec.
As a result of this, the signal lamp extinguishes and the signal
tone ceases to sound.
After 10 sec., 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 will be saved. When power supply is restored, normal
operation is resumed.
5.4 Quit/Reset
To • quit the learning mode or
• acknowledge a failure or
• terminate the radio link distance test or
• terminate the valve test or
• in the event of any other inexplicable phenomena
Mount cover in volt free condition only
╞
Installation and
Operating Instructions
Radio frequency
receiver
INSTAT 868-a4…
U 468 931 003 267-1
This thermostat can be used in all EU and EFTA countries.
The manufacturer hereby declares that this device con-
forms with the basic and other relevant requirements laid
down by directive R&TTE 1999/5/EC.
The declaration of conformity can be downloaded from
„www.funk868MHz.de“.
