Computherm Q8RF(TX) User manual

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

GENERAL DESCRIPTION OF THE THERMOSTAT
The
COMPUTHERM Q8RF(TX) type switched-mode room thermostat is
suitable to regulate the overwhelming majority of boilers and air
conditioners. It can be used together with the COMPUTHERM Q8RF multi-
zone thermostats to complement the two thermostats in the basic
package, to increase the number of zones regulated.
Because there is a wireless (radio-frequency) connection between
the
COMPUTHERM Q8RF(TX) thermostat and the receiver unit of the
COMPUTHERM Q8RF thermostat, no cable is required between the
thermostat and the receiver.
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.
The portability of the thermostat offers the following advantages:
•no need to lay a cable, which is especially advantageous when old build-
ings are being modernized,
•the optimal location of the device can be selected during operation.
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Thermostat
Boiler
Reciever
230V AC, 50-60Hz Zone valves 230V AC, 50-60Hz

The effective range of the transmitter incorporated in the thermostat is approxi-
mately 50m in open terrain. This distance may become considerably shorter
within a building, especially when a metal structure, reinforced concrete or ado-
be 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 pro-
cess. 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 pre-
vent 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(TX) multi-zone programmable
wireless 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 room where the room thermostat is 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 abbreviation 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.
i. 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 abbreviation 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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- 14 -
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 back-
ground 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 with-
out 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. TUNING THE COMPUTHERM Q8RF(TX)
THERMOSTAT AND THE RECEIVER UNIT OF
THE COMPUTHERM Q8RF THERMOSTAT
TOGETHER
9.1 COMPUTHERM Q8RF(TX) - COMPUTHERM Q8RF
If you would like to use the COMPUTHERM Q8RF(TX) thermostat to comple-
ment the COMPUTHERM Q8RF multi-zone thermostat, then follow the tuning
steps described in Section 9.2 of the manual of the COMPUTHERM Q8RF
thermostat.

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10. 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.
TECHNICAL DATA
Technical data of the thermostats (transmitters):
— temperature measurement range:
— adjustable temperature range:
— temperature measurement accuracy:
— temperature calibration range:
— selectable switching sensitivity:
— storage temperature:
— battery voltage:
— power consumption:
— battery lifetime:
— operating frequency:
— dimensions:
— weight:
— temperature sensor type:
5 to 35°C (in 0.1°C increments)
5 to 35°C (in 0.5°C increments)
±0.5°C
±3°C (in 0.1°C increments)
±0.1°C; ±0.2°C; ±0.3°C
-10° t +C 40o °C
2 x 1.5V ALKALINE batteries
(LR type6 A; sizeA )
1.3mW
approx 1 ye. ar
868.35MHz
130 x 80 x 22mm (without holder)
112g
NTC 10kΩ ±1% at 25°C

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)

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.
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For better reading download this Operating
Instruction from our website!
Importer:
Thermostats4U
Email: [email protected]
For additional information visit:
thermostats4U.co.uk
The
COMPUTHERM Q8RF(TX) type thermostat complies
with the requirements of standards EU EMC 2004/108/EC;
LVD 2006/95/EC; and R&TTE 1999/5/EC