COMPUTHERM Q3
digital room thermostat
NEW
design!
Operating Instructions
You can watch the most important aspects of the usage of this thermostat on our video
presentation at www.quantrax.hu or www.computherm-hungary.hu.
GENERAL DESCRIPTION OF THE THERMOSTAT
The COMPUTHERM Q3 type switched-mode room thermostat
is suitable to regulate the overwhelming majority of boilers and
air conditioners available in Hungary. 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.
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 off below and above the adjusted
temperature, respectively, and contributes to reduce energy costs while
maintaining comfort. In cooling mode it switches the opposite way.
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The switching sensitivity of the thermostat can be set to ±0.1°C or
±0.2°C (default setting). This means the difference between the adjusted temperature
and the actual tem- The information shown on the liquid crystal
display of the thermostat
perature measured
includes the following:
during the switching process. In
Temperature
case of the ±0.2°C
switching sensitivity
Temperature
Sign of the
measurement unit
and heating mode boiler working
Room temperature
for example, if the
is displayed
set temperature is
Sign of the air
20°C, then the deSet temperature
conditioner
is displayed
vice switches the
working
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boiler on at 19.8°C or below, and switches it off at 20.2°C or above.
Please refer to Section 4.2 for the modification of the factory default
switching sensitivity of ±0.2°C.
1. LOCATION OF THE DEVICE
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 floor
level.
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
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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.
2. INSTALLATION OF THE THERMOSTAT
The device must be installed and
connected by a qualified professional.
Warning! Modifying the socket can
cause electric shock or product failure.
• To install the thermostat, 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 figure.
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• With the help of the screws provided and some
tools fasten the rear panel of the device to the
wall.
• Using a small screwdriver, remove the cover of the
terminal block from the inner side of the rear panel.
The thermostat controls the boiler or air conditioner
through a potential-free alternating relay that has
the following connection points: No. 1 (NO); No.
2 (COM) and No. 3 (NC). These connection points are located
under an inner cover on the inner side of the rear panel.
• Connect the two connection points of the heating or cooling
equipment to be controlled to terminals No. 1 (NO) and No. 2 (COM),
i.e. to the normally open terminals of the relay. If you would like to
operate an old boiler or any other device that has no connection
points for thermostats, then the No. 1 (NO) and No. 2 (COM)
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connection points of the thermostat should be connected to the
mains cable of the device, similarly as a switch would be connected.
To prevent electric shock, replace the inner cover removed
for the connection of wires after the assembling process has
been completed.
ATTENTION! Always consider the loadability of the thermostat
and follow the manufacturer’s instructions of the heating or cooling
equipment. The device must be installed and connected by a
qualified professional. The voltage appearing at terminals No. 1 and
No. 2 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 significance.
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3. PUTTING THE THERMOSTAT INTO OPERATION
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 flashes the measured room
temperature. (If this information fails to appear on the display,
press “RESET” button located on the main panel of the thermostat.
4. BASIC SETTINGS
After removing the rear panel of the device, the following factory
default settings can be modified by relocating the jumpers (black
plugs) located on the main panel.
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4.1 Selecting the Displayed Temperature
The temperature(s) to be shown on
the display can be selected and set
by the left jumper.
With factory default settings the
jumper is located on the central and
the uppermost pins, in which case
the display shows the currently
measured room temperature value,
while the notice “ROOM” appears
in the bottom right corner of the
display. In this case, the adjusted temperature 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 modified so that
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the display alternately shows the current room temperature 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.
4.2 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
the uppermost pins, resulting in a switching sensitivity of ±0.2°C. It can
be modified to ±0.1°C by relocating the jumper onto the bottommost
and central pins. A smaller switching sensitivity results in steadier
room temperature and therefore in higher comfort. The heat loss of
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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
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 efficiency and hence increases the gas consumption. We
recommend using the ±0.1°C switching sensitivity for heating systems
with high thermal inertia (e.g. underfloor heating), and the ±0.2°C
switching sensitivity (factory default setting) for heating systems with
low thermal inertia (e.g. flat panel radiators).
4.3 Switching between the Heating and Cooling Mode
The heating or the cooling mode of the thermostat can be selected
by the right jumper.
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With factory default settings the jumper is located on the central and
the 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 thermostat 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). 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.
ATTENTION! If the modification of the basic settings was done
after inserting the batteries and the modifications did not take effect,
please press the “RESET” button located on the main panel of the
thermostat.
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5. SETTING THE DESIRED TEMPERATURE
After putting the thermostat into operation and adjusting the basic
settings the thermostat is ready for operation and the adjustment of
the temperature can be started.
Below the temperature adjustment buttons
(
and
) a switch is located. For both
the economy (w) and the comfort (☼) positions
of the switch a different temperature can be set
between 5°C and 40°C, in steps of 0.5°C.
For energy efficiency it is recommended that the comfort temperature
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,
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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) appears 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 blinking on the display). By pressing the buttons
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repeatedly or continuously (the change in values is accelerated),
the desired 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 temperature 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
temperatures are in effect.
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6. OPERATION OF THE INSTALLED THERMOSTAT
After setting the economy and comfort temperatures, the
temperature needed at the moment can be selected using the
switch.
6.1 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 the change in room temperature and temperature setting, the
thermostat controls (switches on or off) 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
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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.
6.2 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 thermostat controls (switches on or off) 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
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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.
7. BATTERY REPLACEMENT
The average lifetime of the batteries is 1 year. The
icon
alternately 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 3).
After battery replacement, the desired temperature should be
adjusted again, because during the battery replacement the
thermostat is reset to factory default settings.
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TECHNICAL DATA
— switchable voltage:
24V AC/DC to 250V AC, 50 Hz
— switchable current: 8A (2A inductive load)
— adjustable temperature range: 5 to 40°C (in 0.5°C increments)
— temperature measurement range: 3 to 45°C (in 0.1°C increments)
— temperature measurement accuracy: ±0.5°C
— selectable switching sensitivity: ±0.1°C; ±0.2°C
— storage temperature: -10°C to +40°C
— battery voltage: 2 x 1.5V ALKALINE batteries
(LR6 type; AA size)
— power consumption: 1.5mW
— battery lifetime: approx. 1 year
— dimensions: 110 x 80 x 22mm
— weight: 95g
— temperature sensor type: NTC 10kΩ ±1% at 25°C
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The COMPUTHERM Q3 type thermostat complies with
the requirements of standards EU EMC 2004/108/EC;
LVD 2006/95/EC and RoHS 2011/65/EU.
Manufacturer: QUANTRAX Kft.
Fülemüle u. 34., Szeged, H-6726, Hungary
Phone: +36 62 424 133 • Fax: +36 62 424 672
E-mail: iroda@quantrax.hu
Web: www.quantrax.hu • www.computherm-hungary.hu
Origin: designed in the EU, made in China
Please watch our video presentation of the most important aspects of the usage of this thermostat at our websites!