Computherm Q8RF User manual

COMPUTHERM Q8RF
Multi-zone programmable wireless
(radio-frequency) digital
room thermostat
Operating Instructions
NEW
design!

GENERAL DESCRIPTION OF THE THERMOSTAT
The
COMPUTHERM Q8RF type switched-mode room thermostat is suitable to
regulate the overwhelming majority of boilers and air conditioners. It can
easily be connected to any gas boiler or air conditioning device that has a
double wire connector for a room thermostat, regardless of whether it has a
24V or 230V control circuit.
The basic package of the device includes two thermostats and a receiver unit.
If required, the equipment can be extended by two additional COMPUTHERM
Q8RF (TX) thermostats. The receiver unit receives switching signals from
the thermostats, controls the boiler (or air conditioner) and gives commands
to open/close the heating zone valves (max. 4 zones, loadability of the
zone outputs: 230V AC, max. 1A (0.5A inductive load)) associated with the
thermostats. The zones can operate independently from each other or, in
case of need, all zones can operate at the same time. This way only those
rooms are heated at a given time, where it is required (e.g. the living room
and the bathroom during the day, and the bedroom during the night). Because
there is a wireless (radio-frequency) connection between the thermostats and
the receiver, no cable is required between the thermostats and the boiler. The
installation and connection of the receiver unit is described in Section 9.
The device can be programmed according to customer-specic requirements
so that the heating/cooling system heats/cools your residence or ofce to
the required temperature at the dates and times specied by you, to reduce
energy costs while maintaining comfort. Separate temperature programs can
be prepared for each day of the week. For each day, beside 1 xed switching
time (PROG ), 6 adjustable switching times (PROG ‒ PROG )can be set (at
10-minute intervals) and a different temperature (in 0.5°C increments) can be
assigned to all 7 switching times.
To increase the lifetime of the batteries, the thermostat will not transmit signals
continuously. Instead it will repeatedly transmit the actual signal every 8 minutes.
Therefore, the regulation of the heating or cooling will continue even after a
blackout.
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Thermostats Boiler
Reciever
230V AC, 50-60Hz Zone valves 230V AC, 50-60Hz

The portability of the thermostat offers the following advantages:
•no need to lay a cable, which is especially advantageous when old
buildings are being modernized,
•the optimal location of the device can be selected during operation,
•it is also advantageous when you intend to locate the thermostat in
different rooms in the course of the day (e.g. in the living room during the
day but in the bedroom at night).
The effective range of the transmitter incorporated in the thermostat is
approximately 50m in open terrain. This distance may become considerably
shorter within a building, especially when a metal structure, reinforced concrete
or adobe wall stands in the way of radio waves.
The switching sensitivity of the thermostat can be set to ±0.1°C, ±0.2°C (default
setting) or ±0.3°C. This gure means the temperature difference between the
adjusted value and the actual temperature measured during the switching
process. In case of the ±0.2°C switching sensitivity and heating mode for
example, if the set temperature is 20°C, then the device switches the boiler on at
19.8°C or below, and switches it off at 20.2°C or above. Please refer to Section
2.4 for the modication of the factory default switching sensitivity of ±0.2°C.
The thermostat is equipped with a pump protection function, which, to prevent
the pump from sticking, switches on the boiler for a one minute period at
12:00 p.m. every day if the pump has not been switched on in a programmed
manner for more than 24 hours (e.g. outside the heating season). See the
activation of the pump protection function in Section 2.5.
The information shown on the liquid crystal display of the
thermostat includes the following:
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The days of the week
Manual control
indicator
Current temperature
of the room
Set temperature
Low battery voltage
Sign of heating/cooling
Time
Programme
number
Temperature
modication until the
next manual interference
Timed manual control
indication

1. LOCATION OF THE DEVICE
The thermostats of the COMPUTHERM Q8RF type device can be freely moved
in your residence. It is reasonable to locate them in rooms used regularly or
for many hours per day so that they are in the direction of natural ventilation
in the room but protected from drought or extreme heat (e.g. direct sunlight,
refrigerator, chimney, etc). Their optimal location is 1.5 m above oor level.
They can be placed on their own stand or can be mounted on a wall.
IMPORTANT WARNING! If the radiator valves in your at are equipped
with a thermostatic head, adjust it to maximum temperature or replace
the thermostatic head of the radiator valve with a manual control knob in
the rooms where the room thermostats are to be located, otherwise the
thermostatic head may disturb the temperature control of the at.
2. PUTTING THE THERMOSTAT INTO OPERATION,
BASIC SETTINGS
2.1 Inserting batteries
Pressing the lock on the upper side of the housing of the thermostat, remove
the back cover of the thermostat as shown in the gure below.
The battery compartment is in the inner side of the front panel of the housing.
Insert 2 AA alkaline batteries (LR6 type) in accordance with the diagram
in the battery compartment. After the batteries have been inserted, the
display ashes the day, time and program number as well as the adjusted
and measured temperatures. (If this information fails to appear on the display,
press the “RESET” button located on the main panel of the thermostat. After
the batteries have been inserted, snap the front panel of the device into the
rear panel and press the “SET” button. After the “SET” button is pressed, the
display stops ashing, the thermostat goes to the main screen and the setting
process can be started.
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2.2 Setting the current day and time
Press the “SET”button to go to the main screen, then press the “DAY” button.
At this time only the rst three letters of the current day will ash on the display
of the thermostat and the hour and minute values can be seen.
Using the large and buttons on the front panel of the device, set the
the current day (Monday MON; Tuesday TUE; Wednesday WED, etc.). Press
the “DAY” button again. At this time the contraction indicating the day stops
ashing and becomes visible continuously while the numbers indicating the
hour will ash on the display. Using the large and buttons on the
front panel of the device, set the hour value of the current time. Press the “DAY”
button again. At this time the numbers that indicate the hour stop ashing and
become visible continuously, while the numbers indicating the minute will begin
ashing. Using the large and buttons on the front panel of the device,
set the minute value of the current time.
When you wish to continue modifying the settings, please press the “DAY”
button again. If you wish to nish settings, conrm them by pressing the “SET”
button. At this point adjusted data are recorded and the device goes back to
the main screen (if no buttons are pressed for at least 15 seconds, the settings
are automatically conrmed and the device goes back to the main screen).
2.3 Switching between the heating and cooling mode
There is a possibility to easily switch between the heating and cooling mode
of the thermostat. The output terminals of the receiver unit No.1 (NO) and
No.2 (COM) are closed below the set temperature in heating mode, and they
are closed above the set temperature in cooling mode (taking the switching
sensitivity into account). Following the heating/cooling command of the
thermostat, 230V AC, 50Hz voltage appears on the zone outputs associated
with the thermostats (L1- N1; L2-N2; etc.). The thermostat indicates the
heating command with the icon and the cooling command with the in
the bottom left corner of the display.
To switch between the two modes, rst press the “SET”button to go to
the main screen. Then press the “SET”button again and hold it down and
press the “COPY” button, too. After this, the notice „ ” or „ ” appears
in place of the time characters, according to the selected mode. Following
this, switch between the modes using the large and buttons, then
conrm it by pressing the “SET”button (if no buttons are pressed for at least
15 seconds, the setting is automatically conrmed). After this conrmation,
the device goes back to the main screen.
2.4 Setting the switching sensitivity (accuracy)
The switching sensitivity means the temperature difference between the
adjusted value and the actual temperature measured during the switching
process. A smaller switching sensitivity results in steadier room temperature
and therefore in higher comfort. The heat loss of the room (building) does
not depend on the switching sensitivity.
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If higher comfort is needed, the switching sensitivity should be set so that it
provides a steadier room temperature. On the other hand, please also take
into account that the boiler should not switch on and off multiple times in an
hour's time except at low outside temperatures (e.g. -10°C), since the frequent
on and off switches of the boiler reduce its efciency and hence increases the
gas consumption. We recommend using the ±0.1°C switching sensitivity for
heating systems with high thermal inertia (e.g. underoor heating), the ±0.2°C
(factory default setting) and ±0.3°C switching sensitivity for heating systems
with low thermal inertia (e.g. at panel radiators).
To change the switching sensitivity, rst press the “SET”button to go to
the main screen. Then press the “DAY” and “COPY” buttons one after the
other. Following this, select the desired switching sensitivity using the large
and buttons. The notices „”, „ ” and „ ” indicate ±0.1°C,
±0.2°C and ±0.3°C, respectively. Finally, conrm the setting by pressing the
“SET”button (if no buttons are pressed for at least 15 seconds, the setting is
automatically conrmed). After this conrmation, the device goes back to the
main screen.
2.5 Activation of the pump protection function
Under the factory default settings, the pump protection function is inactive. In
order to activate or deactivate it, rst press the “SET”button to go to the main
screen. Then press the “DAY” and “PROG”buttons one after the other. Following
this, activate or deactivate this function using the large and buttons.
The notices „ ” and „ ” indicate activated and deactivated state,
respectively. Finally, conrm the setting by pressing the “SET”button (if no buttons
are pressed for at least 15 seconds, the setting is automatically conrmed). After
this conrmation, the device goes back to the main screen.
To prevent the pump from sticking, the activated pump protection function
switches on the boiler for a one minute period at 12:00 p.m. every day outside
the heating season. (The pump protection function can accomplish its task only
if the boiler is in working order in the summer, too. It is reasonable to set a low
temperature level, e.g. +10°C, on the thermostat for this period, to prevent the
boiler from unnecessary start-ups when the weather turns cold temporarily).
2.6 Calibrating the thermometer of the thermostat
There is a possibility to calibrate the thermometer of the thermostat (to correct
the measured temperature). In order to do this, rst press the “SET” button to
go to the main screen. Then press the “DAY ” and “HOLD” buttons one after the
other. After this, the notice „ ” appears in place of the time characters, and
the correction value appears in place of the measured temperature ( °C by
default). Following this, set the desired correction value using the large
and buttons between -3.0°C and +3.0°C, in 0.1°C increments. Finally,
conrm the setting by pressing the “SET” button (if no buttons are pressed
for at least 15 seconds, the setting is automatically conrmed). After this
conrmation, the device goes back to the main screen. The correction of the
measured temperature takes effect a couple of seconds after the conrmation.
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3. PROGRAMMING THE THERMOSTAT
3.1 A brief introduction to programming
•Programming means the setting of switching times and selection of
accompanying temperature levels. The device can be programmed for
a one-week period. Its operation is automatic, and it will cyclically repeat
the programs that have been keyed in. For each day, beside 1 xed (PROG
) switching time, 6 adjustable (PROG ‒ PROG ) switching times can be set.
For all switching times a different temperature can be assigned between
5 and 35°C, in 0.5°C increments. The temperature set for a given switch
will remain valid until the start time of the next switch. Accordingly, the
thermostat will keep the temperature set for switching time PROG until
switching time PROG is reached. After switching time PROG the temperature
selected to switch PROG will be valid until the time of the next switch (PROG ).
•The start time of switch PROG is , which cannot be changed, only
its temperature can be adjusted. So under the factory default settings, the
thermostat performs only one switch (PROG ) every day, which is in effect
from until the next day.
Note: Setting just one switch for a day (factory default setting) is reasonable
only if a constant temperature is needed all day. (For example, if for every
weekday a constant 16°C, and for every weekend a constant 22°C is
needed.) Otherwise, from both a comfort and an energy-efciency point
of view, it is recommended to activate more than one switch for each day.
Furthermore, it is advised that a comfort temperature is used only those
times, when the room or building is in use, since every 1°C decrease of
temperature saves approximately 6% energy during a heating season.
As opposed to common belief, keeping a at warm requires more energy
than heating it up. (When using a stove, more gas is needed to keep a pan
of water boiling than to just keep it warm.)
•The PROG ‒ PROG switches are deactivated by factory default (their
start time is ), but they can be activated at need. Their start time
can be freely set between and at 10-minute intervals given
the constraint, that their start time should be in increasing order and a
difference of at least 10 minutes should be between them. This minimum
10-minute difference is going to be preserved even if a previously activated
switch is modied, in order to avoid co-occurring or overlapping switches.
In such a case, the device automatically increases the start time of the
affected switches until a difference of at least 10 minutes between them is
reached. If the start time of a switch would be later than because of
this automatic modication, then that switch is deactivated instead.
•In order to enter the programming mode, press the “SET” button and hold
it down and press the “PROG” button, too. During the programming the
values being adjusted are ashing on the display. The modication
of these values can always be done using the large and
buttons. The conrmation of a value is always done by pressing the
“PROG” button, after which the next value can be adjusted. The program
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can be saved by pressing the “SET” button. A more detailed description
of the programming steps can be found in Section 3.3.
• If there are days, for which the same program is needed, than it is sufcient
to create that program only once, since it can be easily copied to another
day using the “COPY” button as described in Section 3.4. If the same
program is needed for every day, then there is also a possibility to create
the program of all the days together (by selecting MON TUE WED THU
FRI SAT SUN together during the selection of days). But be aware: if the
program of all the days are created together, than their program can only
be modied together. Therefore, if a different program is needed for at
least one day, then the program of the days should be created separately,
and the repeated programs should be copied using the “COPY” button.
• A separate program can be created for the heating and cooling mode,
and these programs are preserved when switching between the modes.
Therefore, if the thermostat is used for both heating and cooling, then
there is no need to modify the program of the thermostat every time a
switch between these modes is performed.
3.2 Recommendations for creating a heating program
The average comfort needs of a person can usually be satised by a
temperature of 19-21°C during the night, and a temperature of 22-23°C during
the day. During that time of the day, when the family is at work or school, only
a lower temperature is needed. As heating up and cooling down usually takes
a long time, it is reasonable to set the start time of the switches 0.5-1 hour
before the desired time of the modied temperature. The programmability of
the thermostat provides a perfect solution for this.
For an average working family, a program similar to the one below is
recommended:
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3.3 Programming steps
a. Press the “SET” button to go to the main screen.
b. Press the “SET” button again and hold it down and press the “PROG”
button, too. At this point the device gets into programming mode and the
abbreviations indicating the days of the week (MON TUE WED THU FRI
SAT SUN) are ashing on the display.
c. Select the day to be programmed using the large and buttons
on the front panel of the device (MON indicating Monday, TUE indicating
Tuesday etc.). If you wish to create the same program for each day of the
week, it is reasonable to choose all days of the week simultaneously (by
selecting MON TUE WED THU FRI SAT SUN together), this way there is no
need to perform separate programming of the days. After selecting the
desired day(s), press the “PROG” button.
d. At this point the temperature of switch PROG should be set, which is
indicated on the display of the device by ashing the temperature value
to be set ( °C by default). Set the desired temperature using the large
and buttons, then press the “PROG” button.
e. Then, the start time of switch PROG should be adjusted, which is
indicated on the display of the device by ashing the time value to be
adjusted ( by default). Set the desired time using the large and
buttons, then press the “PROG” button.
f. Following this, the temperature of switch PROG should be set, which is
indicated on the display of the device by ashing the temperature value to
be set ( °C by default). Set this temperature level of switch PROG using
the large and buttons, then press the “PROG” button.
g. The next step in programming is the adjustment of the start time of
switch PROG , which is indicated on the display of the device by ashing
the time value to be adjusted ( by default). The adjustment process
of switches PROG ‒PROG can be done (the same way as switch PROG
is adjusted) by repeating the “e”-“f” steps.
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program
number
Temperature

If you do not want to activate any more switches for the selected day(s),
then press the “PROG” button without changing the start time of the next
switch from the default . This way the programming of the selected
day(s) is nished, the thermostat offers another day to be programmed
and the programming can be continued from step “c”.
If all the switches (PROG ‒PROG ) are activated for the selected day(s),
then after setting the temperature value of PROG , the programming of
the selected day(s) is nished, the thermostat offers another day to be
programmed and the programming can be continued from step “c”.
h. The adjusted program can be saved by pressing the “SET” button. After
approximately 1 minute, the adjusted program is automatically saved.
Afterwards, the device goes back to the main screen.
If you wish to copy the program of the day(s) selected in step “c” to other days,
you can easily do so using the “COPY” button as described in Section 3.4.
3.4 Using the “COPY” function (Copying the program of a day to
other days)
• First, press the “SET” button to go to the main screen. Then press the
“COPY” button for approximately 3 seconds to activate the “COPY”
function. The notice " " appearing in place of the time characters and
the ashing abbreviation MON indicating Monday shows that conditions
are ready for copying a program.
• Select the day whose program you wish to copy to another day or other
days using the large and buttons on the front panel of the device.
• Press the “COPY” button to copy the program of the selected day. After
this, the ashing of the abbreviation indicating the day that has been
copied stops and it will be visible continuously hereafter.
• Select the day to which you wish to copy the program of the day copied
beforehand using the large and buttons. The number of the
active day is ashing during this selection process.
• After selecting the abbreviation that indicates the day to which you wish
to copy the program, press the “COPY” button to copy the program.
Hereafter, the abbreviation indicating the day to which the program was
copied will be visible continuously. Following this, you can select further
days using the large and buttons and copy the program to
those days too by pressing the “COPY” button.
• Finally, press the “SET” button to save the modications (if no buttons are
pressed for at least 15 seconds, the modications will be automatically
saved). Afterwards, the device goes back to the main screen. If required,
the program of further days can be freely copied by repeating the above
steps.
ATTENTION! The “COPY” function is only available, if the days of the week
were programmed separately!
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3.5 Modifying the program
• The previously set program can be modied any time by repeating the
steps of programming.
• The number of activated switches can be increased at will as described in
Section 3.3.
• A previously activated switch can be deactivated by setting its start time
to using the large and buttons (or by pressing the “DAY”
button once), and then pressing the “PROG” button. After this, if the
deactivated switch was an intermediate one, then the serial numbers of
the remaining switches will be updated.
• If you wish to nish modifying the program of the selected day, then press
the “PROG” button and hold it down for at least 3 seconds. After this, the
modication can be continued by selecting another day. When nished
with all the modications, press the “SET” button to save them. After
approximately 1 minute, they are automatically saved. Afterwards, the
device goes back to the main screen.
• If a completely different program is needed, then press the “RESET”
button located on the main panel of the thermostat to reset the device (it
deletes both the program and the basic settings). Following this, adjust
the basic settings of the thermostat again and create the new program, as
described in Sections 2 and 3.
3.6 Program inspection
• First, press the “SET” button to go to the main screen, then press the “PROG”
button. At this point, the abbreviation indicating the day(s), the symbol of
switch PROG and the time and temperature level set for switch PROG of the
selected day(s) will appear on the display (none of the values is ashing).
• Repeatedly press the “PROG” button to check the values of switch PROG ,
PROG , etc. Use the large and buttons to change the day(s). If
all the days were programmed together (MON TUE WED THU FRI SAT SUN),
then their common program can only be viewed together.
• After checking the program, press the “SET” button to go back to the main
screen (if no buttons are pressed for at least 15 seconds, the thermostat will
automatically go back to the main screen).
4. TEMPORARY MODIFICATION OF THE TEMPERATURE
CORRESPONDING TO THE PROGRAM
If you wish to operate your device in a way that differs temporarily from the
program that has been set (e.g. on bank holidays or the winter holidays), you
can choose among the options described in Sections 4.1-4.4.
To simplify manual temperature modications, with factory default settings
temperatures of °C and °C are assigned to the large and
buttons, respectively. When modifying the temperature manually, pressing
the and button once, the temperature will immediately jump to the
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factory value of the button. For example, if the current switch PROG ensures
a temperature of °C, it can be modied to a standard temperature that
ensures °C when needed by pressing the button only once, without
having to press the button several times in increments of 0.5°C. Following
this, using the large and buttons, the temperature can be further
modied in increments of 0.5°C, in accordance with current requirements.
The economy and comfort temperature values assigned to buttons and
can be modied as follows:
•To set the economy temperature, press the “SET” button and keep it
depressed and press the button, too. Following this, with the help
of the and buttons, set the economy temperature selected
by you. After the temperature has been set, press the “SET” button to
save the modication (after approximately 15 seconds, it is automatically
saved). Afterwards, the device goes back to the main screen.
•To set the comfort temperature, press the “SET” button and keep it
depressed and press the button, too. Following this, with the help of
the and buttons, set the comfort temperature selected by you.
After the temperature has been set, press the “SET” button to save the
modication (after approximately 15 seconds, it is automatically saved).
Afterwards, the device goes back to the main screen.
4.1 Temperature modication until the next program switch
Set the required temperature using the large and buttons on the
front panel of the device. At this time, the icon appears on the display,
indicating that the thermostat is operated with manual control. The device
will control the boiler according to the set value until the time of the next
switch specied in the program is reached.
During this temporary modication, the segments indicating the time on the
display alternately show the exact time (TIME) and the time remaining (TIME
LEFT) in manual control (for example , that is, 4 hours and 2 minutes).
After this time has elapsed, the icon disappears and the device resumes
the program that has been set. If you wish to return to the set program
before the time of the next switch is reached, please press the “SET” button.
4.2 Temperature modication for 1-9 hours (party program)
Set the required temperature using the large and buttons on the
front panel of the device, and then press the “DAY” button. At this time, the
icon appears on the display, along with number 1 in place of the switch
number, which indicates the duration of modication in hours. Adjust this time
to the desired length (between and ) using the large and buttons.
The party program will start approximately 10 seconds after the adjustment.
Following this, the device will keep the modied temperature for the given
period of time. The adjusted temperature can be freely changed during the
party program without exiting it.
During this temporary modication, the segments indicating the time on the
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display alternately show the exact time (TIME) and the time remaining (TIME LEFT)
in manual control (for example ,that is, 3 hours and 20 minutes). After this
time has elapsed, the icon disappears and the device resumes the program
that has been set. If you wish to return to the set program before the time set for
temperature modication has expired, please press the “SET” button.
4.3 Temperature modication for 1-99 days (holiday program)
Set the required temperature using the large and buttons on the
front panel of the device, and then press the “HOLD” button and hold it down
for at least 2 seconds. At this time, the icon appears on the display, along
with the notice in place of the time characters, which indicates the duration
of modication in days. Adjust this time to the desired length (between 1 and
99) using the large and buttons (1 day means 24 hours). The
holiday program will start approximately 10 seconds after the adjustment.
Following this, the device will keep the modied temperature for the given
period of time. The adjusted temperature can be freely changed during the
holiday program without exiting it.
During this temporary modication, the segments indicating the time on the
display alternately show the exact time (TIME) and the days remaining (TIME
LEFT) in manual control (e.g. , that is, 3 days). After this time has elapsed,
the icon disappears and the device resumes the program that has been
set. If you wish to return to the set program before the time set for temperature
modication has expired, please press the “SET” button.
4.4 Temperature modication until the next manual interference
Set the required temperature using the large and buttons on the
front panel of the device. At this time, the icon appears on the display,
indicating that the thermostat is operated with manual control. Then, press the
“HOLD” button briey, after which the icon appears and the icon
disappears. The device will then control the boiler according to the set value
until the next manual interference. During this time, the thermostat acts exactly
the same way as a non-programmable thermostat. The adjusted temperature
can be freely changed during this temporary modication without exiting it.
If you wish to return to the set program, please press the “SET” button.
5. TURNING ON THE BACKGROUND LIGHT
When you press the “LIGHT” button, the background light of the display will
turn on for 15 seconds. When you press another button while the display
is illuminated, the background light will turn off only after 15 seconds have
elapsed since the last button had been pushed.
6. LOCKING THE CONTROL BUTTONS
The thermostat enables you to lock its control buttons. With this function, you
can prevent unauthorised modication of the program or the set temperature.
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To activate the lock, rst press the “SET” button to go to the main screen, then
press the and buttons together and hold them down for at least 5
seconds. After the control buttons have successfully been locked, the notice
“” appears in place of the time characters for a couple of seconds. Until
the control buttons are locked, their normal function do not work; if any button
is pressed, then only the notice “ ” appears and nothing else happens.
To unlock press the and buttons together and hold them down for
at least 5 seconds. After unlocking the buttons, the notice “ ” appears
in place of the time characters for a couple of seconds, whereupon all the
buttons can be used normally again.
7. CHANGING THE BATTERY
The average lifetime of the batteries is 1 year, but frequent use of the
background light may shorten this time considerably. If the icon indicating
low battery voltage appears on the display, the batteries should be replaced
(see Section 2.1). The exact time should be set again after the batteries have
been replaced, but the device saves the program that has been loaded even
without batteries therefore there is no need to reprogram the device.
8. RESETTING THE THERMOSTAT TO ITS FACTORY
DEFAULT SETTINGS
By pressing the “RESET” button located on the main panel of the thermostat,
the thermostat can be reset to its factory default settings. This results in
deleting the day, exact time, basic settings and the set program. After resetting
the device, adjust the basic settings of the thermostat again and create the
new program, as described in Sections 2 and 3.
9. THE RECEIVER UNIT
9.1 Installation and connection of the receiver unit
The receiver unit should be mounted on the wall in a place protected against
moisture and heat, in the vicinity of the boiler.
ATTENTION! Do not install the receiver unit under the housing of the boiler or
near hot pipes because it may damage the parts of the device or compromise
wireless (radio-frequency) connection. To avoid electric shock, entrust a
specialist with connecting the receiver unit to the boiler!
Unscrew the two screws at the bottom of the receiver unit without removing
them. Following this, remove the front panel of the receiver unit then x the
back panel to the wall in the vicinity of the boiler with the screws provided.
Remove the protective carton from the contacts to ensure perfect contact.
The marks of the connections are located above the connection points:
L1 N1 L2 N2 L3 N3 L4 N4 NO COM L N
230V mains voltage should be supplied to the receiver unit. This provides

- 15 -
the power supply for the device, but this voltage does not appear on the
connection points of the relay that controls the boiler (NO and COM). We
propose to connect the neutral wire of the network to point N, while the phase
conductor to point L. We recommend using a fork type connection including
a switch for mains connection. Please de-energize the device when heating
is continuously not needed (e.g. summer).
The receiver unit controls the boiler or air conditioner through a potential-free
relay whose connection points are: NO and COM. Connect the two connection
points of the heating or cooling equipment to be controlled to terminals NO and
COM, i.e. to the normally open terminals of the relay. These connection points
become closed following the heating/cooling command of any thermostat.
If you would like to operate an old boiler or any other device that has no
connection points for thermostats, then the connection points NO and COM
of the thermostat should be connected to the mains cable of the device,
similarly as a switch would be connected.
ATTENTION! Always consider the loadability of the receiver unit and follow the
manufacturer’s instructions of the heating or cooling equipment. The device must
be installed and connected by a qualied professional!
The voltage appearing at terminals NO and COM depends only on the
system being controlled, therefore the dimensions of the wire are determined
by the type of the device to be controlled. The length of the wire is of no
signicance, the receiver unit may be installed either near the boiler or far
away from it, but do not install it under the housing of the boiler.
If the distance between the transmitter and receiver units is too large due to
local circumstances and it makes the wireless (radio-frequency) connection
unreliable, install the receiver unit nearer to the place of thermostat.
Beside controlling the boiler, the receiver unit can also open/close the valves
of maximum 4 heating zones. Following the heating/cooling command of
one of the thermostat, 230V AC, 50Hz voltage appears on the connection
points of the zone valves associated with the thermostat. The zone valves
should be connected to the connection points L1 N1; L2 N2; L3 N3 and L4
N4 of the receiver.
230V AC
50-60 Hz
230V AC
50-60 Hz N
L
Heating unit (boiler)
Zone valves
Rear panel of the receiver unit
(phase)

- 16 -
Cut or break out the outlets to the required connection points at the bottom of
the receiver unit, in order to be able to connect wires to them.
9.2 Putting the receiver unit into operation
Turn on the power supply to the receiver unit. A few seconds after the LED
lights ash once, the receiver unit becomes ready for operation. This state is
indicated by the blue LED light with the "A/M" sign. After this, you can start
tuning the receiver and the thermostats together. For this purpose press a
button on the receiver associated with one of the heating zones and keep
it depressed (for approximately 3 seconds) until the red LED light next to
it starts ashing. After this, press the “SET” button of the thermostat and
keep it depressed then press the “DAY” button of the thermostat and keep it
depressed too (for approximately 10 seconds) until the notice " " appears on
the display. Next, select the same number as the number of the heating zone
selected on the receiver unit using the large and buttons. Following
this, press the “COPY” button and keep it depressed (for approximately 3
seconds) until the red LED light on the receiver stops ashing (it remains
switched on or off depending on the set and measured temperatures). Finally,
press the “SET” button, so that the receiver unit “learns” the safety code of the
transmitter (thermostat). The safety code will not be lost even during a power
outage, the device memorizes it automatically.
After tuned together, the receiver unit receives switching signals from the
thermostats, controls the boiler (or air conditioner) and gives commands
to open/close the heating zone valves (max. 4 zones, loadability of the
zone outputs: 230V AC, max. 1A (0.5A inductive load)) associated with the
thermostats. The receipt of switching signals is indicated by the switched
on or off state of the red LED light associated with the thermostat on the
receiver. By repeating the above steps, tune all of the thermostats and the
receiver together.
ATTENTION! Pressing the “SET” and “DAY ” buttons simultaneously for 10
seconds and then pressing the "COPY" button generates a new safety code
for the thermostat, and the receiver will recognize it only after a repeated
tuning. With this in mind, do not repeat the tuning steps without any reason
after the units have been tuned successfully.

- 17 -
9.3 Activating the delayed start of the boiler function
When designing the heating zones,
in order the protect the pump of
the boiler, it is reasonable to leave
at least one heating circuit without
a zone valve (e.g. the bathroom
circuit). In such a heating system,
after the boiler is started, the heating
water can freely circulate through
the circuit(s) without a zone valve
until the zone valves are opened (the
opening time of an electro-thermal
actuator is approximately 4 minutes). If the heating system was not designed
as described above, it is reasonable to activate the delayed start of the boiler
function in order the protect the pump of the boiler. If this function is activated,
then the boiler starts only 4 minutes after the receipt of the heating command,
when the zone valves are already opened. Under the factory default settings,
this function is inactive. It can be activated at the back side of the receiver unit,
by relocating the jumper (black plug) with the “DELAY” sign. It is inactive in the
“OFF” position and active in the “ON” position of the jumper.
9.4 Transmission distance inspection
With the help of the “TEST” button of the thermostats you can check whether
the selected thermostat and the receiver unit are within the transmission
distance of the radio-frequency connection. To perform the test, press the
“TEST” button for approximately 2 seconds. Following this, the thermostat will
send, alternating every 5 seconds, switch-on and switch-off control signals to
the receiver for 2 minutes (the signal appears and disappears alternately
on the display). When detecting the ON and OFF control signals, the red LED
light associated with the thermostat on the receiver unit switches on and off,
respectively. When the receiver unit fails to receive signals sent by the thermostat,
then the receiver unit is outside the transmission distance of the wireless (radio-
frequency) transmitter, thus they have to be placed closer to each other.
9.5 Manual control of the receiver unit
Pressing the “A/M” button separates the thermostats from the receiver unit.
In this case, the boiler or air conditioner connected to the receiver unit can
only be turned on and off manually, without any temperature inspection. The
continuously illuminated blue LED indicates automatic (thermostat-controlled)
mode, while its switched off state indicates manual mode. In manual mode,
pressing the 1, 2, 3, and/or 4buttons of the receiver unit turns on or off
the boiler (or air conditioner) and opens/closes the zone valves associated
with the heating zones. The operation of a heating zone is indicated by the
illuminated red LED light associated with it. By pressing the “A/M” button
again, the device quits manual control and resumes automatic (thermostat-
controlled) operation, which is indicated by the illuminated blue LED light.

Switch
No.
Start
time
Temp
°C
Start
time
Temp
°C
Start
time
Temp
°C
Start
time
Temp
°C
Start
time
Temp
°C
Start
time
Temp
°C
Start
time
Temp
°C
MONDAY
(MON)
SUNDAY
(SUN)
SATURDAY
(SAT)
FRIDAY
(FRI)
THURSDAY
(THU)
WEDNESDAY
(WED)
TUESDAY
(TUE)

TECHNICAL DATA
Technical data of the thermostats (transmitters):
— temperature measurement range: 5 to 35°C (in 0.1°C increments)
— adjustable temperature range: 5 to 35°C (in 0.5°C increments)
— temperature measurement accuracy: ±0.5°C
— temperature calibration range: ±3°C (in 0.1°C increments)
— selectable switching sensitivity: ±0.1°C; ±0.2°C; ±0.3°C
— storage temperature: -10°C to +40°C
— battery voltage: 2 x 1.5V ALKALINE batteries
(LR6 type; AA size)
— power consumption: 1.3mW
— battery lifetime: approx. 1 year
— operating frequency: 868.35MHz
— dimensions: 130 x 80 x 22mm (without holder)
— weight: 112g
— temperature sensor type: NTC 10kΩ ±1% at 25°C
Technical data of the receiver unit:
— power supply voltage: 230V AC, 50Hz
— power consumption: 0.3W
— loadability of the relay that controls the boiler: 24V AC/DC to 230V AC, 50Hz,
6A (1A inductive load)
— voltage of the zone outputs: 230V AC, 50Hz
— loadability of the zone outputs: 1A (0.5A inductive load)
— transmission distance: approx. 50m in open terrain
— weight: 210g
Total weight of the device: approx. 550g (2 thermostats+2 holders+1 receiver)
- 19 -

A BRIEF DESCRIPTION OF PROGRAMMING
•Setting the date and time: press the “DAY” button, then adjust values using the
“DAY”, and buttons.
•Programming: press and hold down the “SET” button, while pressing the
“PROG” button too, then adjust values with the “PROG”, and
buttons; use the “COPY” button to copy repeated programmes.
•Program inspection: using the “PROG”, and buttons.
•Retuning: using the "1", "2", "3", "4", "SET", "DAY" and "COPY" buttons (see
Section 9.2).
•Transmission distance control: press the “TEST” button for more than 2
seconds.
•Temporary modication of the temperature set in the program:
•until the next switch in the program: set the temperature using the
and buttons.
•for a period of 1 to 9 hours: set the temperature using the and
buttons, then press the “DAY” button, and nally set the duration using the
and buttons.
•for a period of 1 to 99 days: set the temperature using the and
buttons, then press the “HOLD” button and hold it down for 2 seconds, and
nally set the duration using the and buttons.
•until the next interference: set the temperature using the and
buttons, then press the “HOLD” button briey.
The COMPUTHERM Q8RF type thermostat complies with
the requirements of standards EU EMC 2004/108/EC;
LVD 2006/95/EC; and R&TTE 1999/5/EC
For better reading download this Operating
Instruction from our website!
Importer:
Thermostats4U
Email: [email protected]
For additional information visit:
thermostats4U.co.uk