Quantrax COMPUTHERM Q5RF User manual

COMPUTHERM Q5RF (TX)
Multi-zone 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.quantrax.hu.

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GENERAL DESCRIPTION OF THE THER-
MOSTAT
The COMPUTHERM Q5RF (TX) type switched-mode room
thermostat is suitable to regulate the overwhelming majority of boilers
and air conditioners available in Hungary. It can be used together
with the COMPUTHERM Q5RF or Q8RF multi-zone thermostats to
complement the two thermostats in the basic package, to increase
the number of zones regulated and to control the COMPUTHERM
Q1RX wireless (radio-frequency) thermostat-controlled socket.
Because there is a wireless (radio-frequency) connection
between the COMPUTHERM Q5RF (TX)thermostat and the
receiver unit of the COMPUTHERM Q5RF/Q8RF thermostat
and/or the COMPUTHERM Q1RX socket, no cable is required
between the thermostat and the receiver and/or the socket. (You
can find detailed information and recommended usage of the
COMPUTHERM Q1RX socket and COMPUTHERM Q5RF/Q8RF
thermostats on our website: www.quantrax.hu)
Temperature can be measured and set more precisely as compared
to simple, conventional thermostats. In heating mode, in accordance
with the selected switching sensitivity, the thermostat switches
the boiler or any other appliances on and o󰀨 below and above

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the adjusted temperature, respectively, and contributes to reduce
energy costs while maintaining comfort. In cooling mode it switches
exactly the opposite way.
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.
Thermostat
Boiler
Receiver
230 V AC, 50-60 Hz Zone valves 230 V AC, 50-60 Hz

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The portability of the thermostat o󰀨ers 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 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 e󰀨ective 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.
The switching sensitivity of the thermostat can be set to ±0.1 °C or
±0.2 °C (default setting). This means the di󰀨erence between the
adjusted temperature and the actual temperature measured during
the switching process.
In case of the ±0.2°C switching sensitivity and heating mode for exam-
ple, if the set temperature is 20 °C, then the device switches the boiler
on at 19.8 °C or below, and switches it o󰀨 at 20.2 °C or above. Please

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refer to Section 3.2 for the modication of the factory default switching
sensitivity of ±0.2 °C.
1. LOCATION OF THE DEVICE
The thermostat of the COMPUTHERM Q5RF (TX) 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). Its optimal location is 1.5 m above oor level. It can be placed
on its own stand or can be mounted on a wall.
Temperature
Temperature
measurement unit
Room temperature
is displayed
Set temperature
is displayed
Sign of the
boiler working
Sign of the air
conditioner
working
The information shown on the liquid crystal
display of the thermostat includes the following:

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IMPORTANT WARNING! If the radiator valves in your at are
equipped with a thermostatic head, adjust it to maximum temper-
ature 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 tem-
perature control of the at.
2. PUTTING THE THERMOSTAT INTO
OPERATION
The device must be installed and connected by a quali-
ed professional.
Warning! Modifying the socket can cause electric shock or product
failure.
To put the thermostat into operation, detach the rear panel of the
thermostat from the front panel by
pressing the lock on the upper side of
the housing of the thermostat, as shown
in the gure. 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 compar tment.

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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.
After the batteries have been inserted, the display ashes the
measured room temperature. (If this information fails to appear on
the display, press the „RESET” button located on the main panel of
the thermostat.
3. BASIC SETTINGS
After removing the rear panel of the de-
vice, the following factory default settings
can be modied by relocating the jumpers
(black plugs) and/or changing the position
of the orange-colored potentiometer lo-
cated on the main panel.
3.1 Selecting the Displayed Temperature
The temperature(s) to be shown on the display can be selected and set
by the left jumper.

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With factory default settings the jumper is located on the central and
uppermost pins, in which case the display shows the currently meas-
ured room temperature value, while the notice “ROOM” appears in the
bottom right corner of the display. In this case, the adjusted tempera-
ture is visible only during the adjustment process, for approximately 7
seconds after the last button has been pushed. By relocating the plug
onto the bottommost and central pins the displayed temperature can
be modied so that the display alternately shows the current room tem-
perature and the adjusted temperature for 4 seconds, respectively. In
this mode, the notices “ROOM” and “SET” are alternately shown under
the currently displayed temperature in the bottom right corner of the
display, indicating whether the display shows the room temperature or
the adjusted temperature value.
3.2 Selecting the Switching Sensitivity (Accuracy)
The switching sensitivity of the thermostat can be selected or adjusted
by the central jumper.
With factory default settings the jumper is located on the central
and uppermost pins, resulting in a switching sensitivity of ±0.2 °C.
It can be modied to ±0.1 °C by relocating the jumper onto the
bottommost and central pins. A smaller switching sensitivity re-
sults in steadier room temperature and therefore in higher comfort.

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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󰀨 mul-
tiple 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 recom-
mend using the ±0.1 °C switching sensitivity for heating systems with
high thermal inertia (e.g. underoor heating), and the ±0.2 °C switching
sensitivity (factory default setting) for heating systems with low thermal
inertia (e.g. at panel radiators).
3.3 Switching between the Heating and Cooling Mode
The heating or the cooling mode of the thermostat can be
selected by the right jumper.
With factory default settings the jumper is located on the
central and uppermost pins, which selects the heating mode.
By relocating the jumper onto the bottommost and central
pins, the cooling mode can be selected. The output terminals
No. 1(NO) and No. 2(COM) of the receiver unit are closed

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below the set temperature in heating mode, and they are
closed above the set temperature in cooling mode (taking
the switching sensitivity into account). The closed state of the
output terminals No. 1(NO) and No. 2 (COM) are indicated by
the notice „HEAT” (heating) or „A/C” (cooling) in the bottom left
corner of the display, according to the selected mode.
3.4. Calibration of the thermometer of the thermostat
You can calibrate the thermometer of the appliance (to correct
measured temperature). To this end all you have to do is change
the position of the orange-colored potentiometer by a Phillips
screwdriver. When you adjust the potentiometer clockwise then
the displayed temperature will be higher than that measured
initially, and when you adjust it anticlockwise the displayed
temperature will be lower than that. The displayed temperature
can be adjusted within a range of approx. 3 °C.
Correction of the displayed temperature takes place a few
seconds after the adjustment.
ATTENTION! If the modication of the basic settings was done
after inserting the batteries and the modications did not take ef-
fect, please press the “RESET” button located on the main panel
of the thermostat.

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3.5 Synchronising the Thermostat and the
Receiver Unit
In order to have a safe, reliable and trouble-free wireless
(radio-frequency) connection, both the thermostat and the
receiver unit have their own safety codes. After installing the
receiver unit, the two units should be
synchronised by pressing the “LEARN”
button located above the battery
compartment, on the main panel of the
thermostat. Therefore do not replace
the rear panel of the thermostat onto
the front panel before synchronisation.
The process of synchronisation is
described in Section 7.
4. SETTING THE DESIRED TEMPERATURE
After putting the thermostat into operation and adjusting the ba-
sic settings the thermostat is ready for operation and the adjust-
ment of the temperature can be started.
Below the temperature adjustment buttons ( and ) a
switch is located. For both the economy (w ) and the comfort (☼)

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positions of the switch a different tempera-
ture can be set between 5 °C and 40 °C, in
steps of 0.5 °C.
For energy efficiency it is recommended that the comfort tem-
perature is only used those times, when the room or building
is in use, because every 1 °C decrease of temperature saves
approximately 6% energy during a heating season. As opposed
to common belief, keeping a flat warn 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 factory default temperature is 18 °C for the economy (w )
position and 20 °C for the comfort (☼) position. These default
temperatures can be changed as follows:
• Move the switch according to the temperature you would
like to change (economy (w ) or comfort (☼)).
• Press the or button, after which the notice
“ROOM” disappears, the notice “SET” (adjusted value) ap-
pears in the bottom right corner of the display. Meanwhile,
the temperature value shown on the display switches from
room temperature to the default temperature (18.0 °C/20.0
°C) or to the last set temperature (this temperature is blink-
ing on the display). By pressing the buttons repeatedly or

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continuously (the change in values is accelerated), the de-
sired temperature to be maintained at the place where the
thermostat has been installed can be set in steps of 0.5 °C.
• Approximately 7 seconds after setting the room tempera-
ture to be maintained, the device automatically switches to
normal mode. The notice “SET” disappears from the bottom
right corner of the display, and once again the current room
temperature and the notice “ROOM” are displayed.
• The previously set temperature can be freely changed any
time using the and buttons. Always the last set tempera-
tures are in effect.
5. OPERATION OF THE INSTALLED
THERMOSTAT
After setting the economy and comfort temperatures, the tempera-
ture needed at the moment can be selected using the switch.
5.1 Economy Mode (
w
)(left hand position of the
switch)
In the left hand position of the switch, the thermostat provides the
set economy temperature (e.g. night temperature) to be maintained
at the place where the thermostat has been installed. According to

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the change in room temperature and temperature setting, the ther-
mostat controls (switches on or o󰀨) the boiler or any other equipment
connected to it. When activated, the normally open contact pairs, i.e.
No. 1 (NO) and No. 2(COM), of the relay of the thermostat clamp shut,
and, as a consequence, the appliance connected to the thermostat is
switched on. The appearance of the notice “HEAT” (heating) or „A/C”
(cooling) in the bottom left corner of the display indicates that the device
is activated, according to the heating or cooling mode, respectively.
5.2 Comfort Mode (☼)(right hand position of the
switch)
In the right hand position of the switch, the thermostat provides the
set comfort temperature (e.g. daytime temperature) to be maintained
at the place where the thermostat has been installed. According to
the change in room temperature and temperature setting, the ther-
mostat controls (switches on or o󰀨) the boiler or any other equipment
connected to it. When activated, the normally open contact pairs, i.e.
No. 1(NO) and No. 2(COM), of the relay of the thermostat clamp
shut, and, as a consequence, the appliance connected to the thermo-
stat is switched on. The appearance of the notice “HEAT” (heating)
or „A/C” (cooling) in the bottom left corner of the display indicates
that the device is activated, according to the heating or cooling mode,
respectively.

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6. BATTERY REPLACEMENT
The average lifetime of the batteries is 1 year. The icon alter-
nately replacing the temperature value on the display indicates
low battery voltage. Replace the batteries whenever the icon
indicating low battery voltage appears on the display (see Section
2). After battery replacement, the desired temperature should be
adjusted again, because during the battery replacement the ther-
mostat is reset to factory default settings.
Warning! Alkaline batteries may only be used for this appli-
ance. 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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7. USE AND SYNCHRONIZATION OF THER-
MOSTAT COMPUTHERM Q5RF (TX) AND THE RE-
CEIVER OF COMPUTHERM Q5RF / Q8RF AND/OR
COMPUTHERM Q1RX PLUG
7.1 COMPUTHERM Q5RF (TX) - COMPUTHERM Q5RF /
Q8RF
When you wish to use thermostat COMPUTHERM Q5RF (TX) in or-
der to extend COMPUTHERM Q5RF / Q8RF multi-zone device then
carry out synchronization according to the instructions for use of
thermostat COMPUTHERM Q5RF / Q8RF.
7.2 COMPUTHERM Q5RF (TX) - COMPUTHERM Q1RX
When you want to use thermostat COMPUTHERM Q5RF (TX) with
a COMPUTHERM Q1R X plug that can be controlled by a RF thermo-
stat, carry out the synchronization of the two units in the following
way:
COMPUTHERM Q1RX plug:
Press and hold the "ON/OFF" button on the front panel of the plug
until the green LED starts to ash.

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COMPUTHERM Q5RF (TX) thermostat:
• Separate the back panel of thermostat COMPUTHERM
Q5RF(TX) from the front panel by pushing the latch located on
the upper side of the case.
• Press and hold buttons „LEARN” and „RESET” located inside
the thermostat smultaneously.
• Release the „RESET” button and keep the „LEARN” button de-
pressed for additional 5 seconds.
• Following this, sign U1 appears on the display of the thermo-
stat, indicating that the thermostat can now be synchronized
with zone 1 of the receiving unit.
• If a lettering other than U1 appears on the display of the thermo-
stat, select zone 1 with the help of buttons and .
• Press and hold the „LEARN” button located inside the
thermostat for approx. 3 seconds until the green LED on the
COMPUTHERM Q1RX plug stops ashing.
After the two units have been synchronized, the thermostat con-
trols the plug according to the temperature program having been
set. When the thermostat is switched on, 230 V, 50 Hz mains volt-
age appears on the output socket of the plug.

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7.3 Resetting synchronization method of thermo-
stat COMPUTHERM Q5RF
When you wish to reset operation of thermostat COMPUTHERM
Q5RF (TX) to default zone 1 then you can reset this option with
the following steps:
• Press the „RESET” button located inside the thermostat and
the button on the front panel simultaneously.
• Release the „RESET” button but keep the button depressed
for additional 5 seconds.
• Now the synchronization method of the thermostat is reset to
default zone 1.
7.4 Transmission distance inspection
With the help of the and buttons you can check
whether the two units are within the transmission distance of the
wireless (radio-frequency) connection. In order to do so, set the
desired temperature above room temperature by more than 0.2
°C, then reduce it below room temperature by more than 0.2 °C.
When detecting the ON and OFF control signals, the red LED light
on the receiver unit or the green light ont he COMPUTHERM Q1RX

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plug switches on and o󰀨, 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.
ATTENTION! If the two parts of the device can only be placed on
the edge of the wireless (radio-frequency) range or out of it (due
to the oor-plan of the house or the shading eect of its structure),
to guarantee the safe wireless connection, place a COMPUTHERM
Q2RF wireless repeater between the two parts.

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FREQUENTLY ASKED QUESTIONS
When you think that your appliance is operating incorrectly or encounter
any problem while the appliance is being used then we recommend that you
read Frequently Asked Questions (FAQ) available on our website, where we
collected the problems and questions that most frequently occur while our
appliances are being used, along with the solutions thereto:
http://www.quantrax.hu/gyik/
The vast majority of the problems encountered can be solved easily by us-
ing the hints available on our website, without seeking professional help.
If you have not found a solution to you problem, please pay a visit to our
qualied service.
Warning! The manufacturer does not assume responsibility for any
direct or indirect damages and loss of income occurring while the ap-
pliance is being used.