Computherm Q7 RF User manual

COMPUTHERM Q7RF
Programmable wireless (radio-frequency)
digital room thermostat
Operating Instructions
You can watch the most important aspects of the usage of this thermostat on our video
presentation at www.computherm.info.

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GENERAL DESCRIPTION OF THE THERMOSTAT
The COMPUTHERM Q7RF type switched-mode room ther-
mostat is suitable to regulate the overwhelming majority of
boilers and air conditioners. It can be easily connected to any
gas boiler having a two-wire thermostat connection point and
to any air conditioning apparatus or electrical apparatus, re-
gardless of whether they have a 24 V or 230 V control circuit.
230 V AC
50 Hz
230 V AC
50 Hz
Boiler
Receiver
Thermostat

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The device can be programmed according to customer-spe-
cic requirements so that the heating/cooling system heats/
cools your residence or o󰀩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, be-
side 1 xed switching time (PROG ), 6 adjustable switching
times (PROG –PROG ) can be set (at 10-minute intervals)
and a di󰀨erent temperature (in 0.5 °C increments) can be as-
signed to all 7 switching times.
The device consists of two units. One of them is the portable
control unit (thermostat), while the other unit is the receiver
that controls the boiler. Because there is a wireless (radio-
frequency) connection between the two units, no cable is
required between the thermostat and the boiler. The two units
have been tuned in the factory. The trouble-free operation
is ensured by its own security code. The installation and
connection of the receiver unit is described in Chapter 10.

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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 days of
the week
Manual control
indicator
Current
temperature
of the room
Set
temperature
Low battery
voltage
Sign of the
boiler/air
conditioner
working
Time / Time left
time from manual
modication
Program number
Temperature
modication
until the
next manual
interference
Timed manual
control
indication
The information shown on the liquid crystal
display of the thermostat includes the following:

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The portability of the thermostat o󰀨ers the following ad-
vantages:
• 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 di󰀨erent 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 50 m 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.
This wireless (radio-frequency) thermostat can also be easi-
ly extended with the COMPUTHERM Q1RX socket if needed,
with which the thermostat is able to control any electrical de-
vice (e.g. fan heaters, pumps, zone valves, etc.) operating on

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230 V (50 Hz; max. 16 A) according to the room temperature.
(Detailed description of the COMPUTHERM Q1RX socket and
usage suggestions can be found on our website www.com-
putherm.info.)
The COMPUTHERM Q7RF thermostat can be used as an ex-
tension to the COMPUTHERM Q5RF or Q8RF multi-zone de-
vices.
The simultaneous use of several COMPUTHERM room thermo-
stats and one COMPUTHERM Q4Z zone controller provides the
possibility for the thermostats to also control a pump or a zone
valve in addition to starting the heater or cooler. This way it is
easy to divide a heating / cooling system into zones, thanks
to which the heating / cooling of each room can be controlled
separately, thus greatly increasing comfort. Furthermore, the
zoning of the heating / cooling system will greatly contribute to
the reduction of energy costs, as due to this only those rooms
will be heated / cooled at any time where it is required.

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1. LOCATION OF THE DEVICE
The thermostat of the COMPUTHERM Q7RF type device can
be freely moved in your residence. It is reasonable to locate it
in a room used regularly or for many hours per day so that it is
in the direction of natural ventilation in the room but protected
from drought or extreme heat (e.g. direct sunlight, refrigerator,
chimney, etc). Do not use in wet, chemically aggressive or dusty
environment. Its optimal location is 0.75 - 1.5 m above oor level.
It can be placed on its own stand or can be mounted on a wall.
IMPORTANT WARNING! If the radiator valves in your
flat 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 flat.

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2. PUTTING THE THERMOSTAT INTO
OPERATION, BASIC SETTINGS
2.1 Inserting batteries
Pressing the lock on the upper
side of the housing of the ther-
mostat, remove the back cover
of the thermostat as shown in
the figure 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.
Warning! Alkaline batteries may only be used for this
appliance. Carbon-zinc batteries known as durable or long
life batteries and chargeable accumulators are not suitable
for the operation of this appliance. Icon appearing on the
display to indicate low battery voltage warns reliably that the
batteries should be replaced only when alkaline batteries
are used.

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After the batteries have been inserted, the display flashes
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 flashing, the thermostat goes to
the main screen and the setting process can be started.
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 first three letters of
the current day of the day will flash 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 current day (Monday MON; Tuesday TUE;
Wednesday WED, etc.). Press the “DAY” button again. At this
time the abbreviation indicating the day stops flashing and

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becomes visible continuously while the numbers indicating
the hour will flash 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 flashing and
become visible continuously, while the numbers indicating the
minute will begin flashing. 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 finish settings,
confirm 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 confirmed 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

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1 (NO) and 2 (COM) of the receiver unit 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).
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 of the thermostat determines how
much below/above the set temperature the thermostat
switches on/o󰀨 the device connected to it. A smaller switching
sensitivity results in steadier room temperature and therefore

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in higher comfort. The heat loss of the room (building) does
not depend on the switching sensitivity.
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 o󰀨 multiple times in an hour’s time except at
low outside temperatures (e.g. -10 °C), since the frequent on
and o󰀨 switches of the boiler reduce its e󰀩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

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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.
You can read more about switching sensitivity in Chapter 3.
2.5 Activation of the pump protection function
Under the factory default settings, the pump protection func-
tion 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 connected device for a

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1-minute period at 12:00 p.m. every day, if no switch has been
performed on the given day or the day before (e.g. 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,

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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 e󰀨ect a
couple of seconds after the conrmation.
3. OPERATION OF THE INSTALLED
THERMOSTAT
The thermostat controls the device connected to it
(e.g. gas boiler or pump) based on the temperature
measured by it and the currently set temperature, taking
into account the switching sensitivity of the thermostat
(factory default ±0.2 °C). This means that if the thermostat
is set to heating mode and 22 °C, then with a switching
sensitivity of ±0.2 °C the connection points 1 (NO) and
2 (COM) of the receiver output relay are closed below
21.8 °C (heating is turned on) and opened at temperatures
above 22.2 °C (heating is turned o󰀨). In cooling mode, the
relay switches exactly the opposite way.

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The closed status of the output relay terminals 1 (NO) and
2 (COM) is indicated by the or icon in the lower left
corner of the display, depending on the selected operating
mode.
4. PROGRAMMING THE THERMOSTAT
4.1 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 (PROG – PROG ) that have been set. For
each day, beside 1 xed (PROG ) switching time, 6
adjustable switching times can be set. For all switching
times a di󰀨erent temperature can be assigned between
5 and 40 °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

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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 e󰀨ect 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-e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.

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• 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 di󰀨erence of at least 10 minutes should be
between them. This minimum 10-minute di󰀨erence 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 a󰀨ected switches until
a di󰀨erence 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

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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 can be saved
by pressing the “SET” button. A more detailed description
of the programming steps can be found in Chapter 4.3.
• If there are days, for which the same program is needed,
than it is su󰀩cient to create that program only once, since
it can be easily copied to another day using the “COPY”
button as described in Chapter 4.4.
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 di󰀨erent 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