Computherm q3rf User manual

COMPUTHERM Q3 RF
wireless (radio-frequency) digital
room thermostat
Operating Instructions

GENERAL DESCRIPTION OF THE THERMOSTAT
The COMPUTHERM Q3 RF type switched-mode room
thermostat is suitable to regulate the overwhelming majority of
boilers 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 24 V or 230 V
control circuit.
Temperature can be measured more precisely as compared
to simple, conventional thermostats. In accordance with the
selected switching sensitivity, the thermostat will switch 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.
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 so that they operate at the same frequency. The trouble-
free operation is ensured by its own security code.
To increase the lifetime of the batteries, the thermostat will
not transmit signals continuously. It will only send signals to the
receiver whenever it should perform a switch.
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Boiler
Receiver
~ 230V
50 to 60 Hz
Thermostat
~ 230V
50 to 60 Hz

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
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 50 m in open terrain. This distance
may become considerably shorter within a building, especially
when a metal structure or a reinforced concrete wall stands in the
way of radio waves.
The switching sensitivity of the thermostat is ± 0.2°C (± 0.3°C).
This means the difference between the adjusted temperature and
the actual temperature measured during the switching process. For
example, if the factory default setting is 20°C on the thermostat,
then the device switches the boiler on at 19.8°C or below, and
switches it off at 20.2°C or above.
This wireless (radio-frequency) thermostat can also be extended
with the COMPUTHERM Q1 RX socket if needed, with which the
thermostat is able to control boilers or any other electrical devices
operating on 230 V (50Hz; max. 10A) (e.g. fan heaters, pumps,
zone valves, etc.) according to the room temperature. (For more
information please consult our website).
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Heating mode
Defrosting mode
Temperature
display
Temperature
measurement unit
Room temperature
Set temperature
The information shown on the liquid crystal display of the
thermostat includes the following:

1. LOCATION OF THE DEVICE
The thermostat of the COMPUTHERM Q3 RF 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 floor 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, replace the thermostatic
head of the radiator valve with manual control knob or adjust it
to maximum temperature in the room where the room thermostat
is to be located, otherwise the thermostatic head may disturb the
temperature control of the flat.
2. PUTTING THE THERMOSTAT INTO OPERATION,
BASIC SETTINGS
To put the thermostat into operation,
detach the rear panel of the thermostat from
the front panel by loosening the screws at the
bottom of the cover as shown in the figure.
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 the „RESET” button with a wooden or plastic stick. To press
the button, do not use any electrically conductive materials or
graphite pencil).
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3. DEFAULT SETTINGS
Afterremovingtherearpanel
of the device, the following
factory default settings can
be modified by relocating the
jumpers (black plugs) located
on the base panel.
3.1 Modifying the Switching Sensitivity
The switching sensitivity of the thermostat can be selected or
adjusted by the uppermost jumper.
The factory default switching sensitivity (the difference between
the adjusted temperature and the temperature measured when
the device is switched on or off) is ± 0.2°C that can be modified to
± 0.3°C by relocating the plug onto the left and central pins.
3.2 Changing the Unit of Measurement of the
Displayed Temperature
The unit of measurement of the temperature shown on the
LCD display can be selected and set by the central jumper.
With factory default settings the display shows the temperature
in °C (Celsius) which can be modified to °F (Fahrenheit) by
relocating the plug onto the left and central pins.
3.3 Changing the Displayed Temperature
The temperature(s) to be shown on the LCD display can
be selected and set by the bottommost jumper.
With factory default settings the display shows the
currently measured room temperature value, while the notice
“ROOM” appears in the bottom right corner of the display. The
adjusted temperature is visible only during the adjustment
process (for approximately 15 seconds). By relocating the
plug onto the left and central pins the displayed temperature
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can be modified so that the display alternately shows the
current room temperature and the adjusted temperature for 4
seconds, respectively. In this mode, 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.
Attention! To modify the factory default settings after inserting
the batteries, press the “Reset” button with a small wooden or
plastic stick to activate them.
3.4 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
next to the battery compartment 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 7.2.
4. SETTING THE DESIRED TEMPERATURE
The factory default temperature was set to 20°C and in case of
the default switching sensitivity (± 0.2°C), the thermostat switches
on and off the connected heating appliance below 19.8°C and
above 20.2°C, respectively. This default temperature can be freely
changed in steps of 0.5°C between 10°C and 30°C as follows:
Press the or button and the notice „• SET” (adjusted
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value) appears in the bottom right corner of the display, while
the temperature value shown on the display switches from
room temperature to the default temperature (20.0°C) or to
the last set temperature (the set temperature is blinking on
the display). Pressing the buttons 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 15 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 is displayed.
5. OPERATION OF THE INSTALLED THERMOSTAT
After connecting, commissioning and
performing basic settings and setting the
temperature, the thermostat is ready for
operation and controls the connected devices
according to the position, i.e. HEAT or
Defrosting ( ) of the operating mode switch
located above the push buttons for temperature adjustment.
5.1 Heating Mode (right hand position of the switch)
According to the change in room temperature and temperature
setting, the device controls (switches on or off) the boiler or any other
heating equipment connected to the appliance. When activated, the
normally open contact pairs, i.e. No. 1(NO) and No. 2(COM), of the
relay of the device clamp shut, and, as a consequence, the appliance
connected to the thermostat is switched on. The appearance of the
notice “HEAT” in the bottom left corner of the display indicates that
the device is activated.
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5.2 Defrosting Mode (left hand position of the switch)
In the left hand position of the operating mode switch the
thermostat provides defrosting in the vicinity of the installation, and,
in order to avoid the possibility of freezing, it switches the boiler or
any other heating appliances connected to the thermostat on and
off below and above +7.0°C, respectively. During defrosting the
normally open contact pairs, i.e. No. 1(NO) and No. 2 (COM) of the
relay of the receiver unit clamp shut and, as a consequence, the
device connected to the receiver unit is switched on. The activated
state is indicated by the appearance of a (snowflake) icon
on the LCD display. During defrosting the temperature adjustment
buttons are inactive.
6. BATTERY REPLACEMENT
The average lifetime of the batteries is 1 year. The “ ” icon
alternately replacing the temperature value on the LCD display
indicates low battery voltage. Replace the batteries whenever the
“ddd” 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.
7. THE RECEIVER UNIT
7.1 Installation and connection of the receiver unit
The receiver unit should be mounted on the wall in a place
protected against moisture in the vicinity of the boiler.
ATTENTION! Do not install the receiver unit under the housing
of the boiler because it may shield radio signals and 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
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unit then fix 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 pressed into plastic above the sensors: N, L, 1, 2and 3.
230 V mains voltage should be supplied to the receiver unit. We
recommend using a fixed cable instead of a fork type connection
for mains connection to avoid any unintentional de-energization of
the device. We propose to connect the neutral wire of the network
to point N, while the phase conductor to point L. We propose to
interpose a switch so that the receiver unit can be de-energized
if required.
The receiver unit controls the boiler through a potential-free
alternating relay whose connection points are: 1(NO); 2(COM);
3(NC). The connection wires of the boiler should be connected to
terminals 1(NO) and 2(COM) to control a heating equipment, while
the connection wires of the cooling equipment should be connected
to terminals 2(COM) and 3(NC) to control a cooling unit.
ATTENTION! The instructions of the manufacturer of the heating
(cooling) equipment should always be followed!
Heating unit (Boiler)
Rear panel of the
receiver unit
N
L
(phase)
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~ 230V
50 to 60 Hz
~ 230V
50 to 60 Hz
LN 1 2
COM
NO NC

The voltage appearing on terminals 1, 2or 3depends only on
the system to be controlled, therefore the dimension of the wire to
be used is determined by the type of the device to be controlled.
The length of the wire is of no significance, the receiver unit may
be installed either near the boiler or far away from it.
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.
7.2 Putting the receiver unit into operation
Turn on the power supply to the receiver unit. After a few seconds
have elapsed, the wireless (radio-frequency) system (thermostat
and receiver unit) tunes itself to the specified frequency. On trial
press the button of the thermostat several times, until the set
temperature is 2-3°C higher than the temperature of the room.
Following this, the “HEAT” icon indicating that the heating is turned
on should appear on the display of the thermostat within a few
seconds.
At the same time, the red LED light on the receiver unit should
switch on to indicate that the receiver unit has received the
command of the transmitter (thermostat).
If it does not happen, the system should be retuned. For this
purpose press the “M/A” button of the receiver unit and keep it
depressed (for approximately 10 seconds) until the green LED
starts flashing. Then press the “LEARN” button of the thermostat
located near the battery compartment and keep it depressed (for
approximately 10 seconds) until the green LED stops flashing
and goes out, 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 system memorizes it automatically.
ATTENTION: Pressing the “LEARN” button for 10 seconds
generates a new safety code for the thermostat, and the receiver
will recognize it only after a repeated tuning. With this in mind, do
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not keep the “LEARN” button of the thermostat or the “M/A” button
of the receiver unit depressed without any reason after the two
units have been tuned successfully.
7.3 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 switches on and off, respectively. When the receiver
unit fails to receive signals sent by the thermostat, then the two
units are outside the transmission distance of the wireless (radio-
frequency) transmitter, thus they have to be placed closer to each
other.
7.4 Manual control of the receiver unit
Pressing the “MANUAL” button separates the thermostat from
the receiver unit, and the boiler connected to the receiver unit
can only be turned on and off manually, without any temperature
inspection. The continuously illuminated green LED indicates
“MANUAL” mode. Pressing the “M/A” button turns on or off the
boiler. (The red LED is illuminated when the boiler is turned on).
By pressing the “MANUAL” button again, the thermostat resumes
normal (automatic) operation (the green LED goes out).
7.5 Avoiding external impacts
Virtually no external devices (a radio, cell phone, etc.) will
exert any influence on the operation of the device. Should you
experience any operating trouble, please retune the system as
described in Section 7.2.
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TECHNICAL DATA
Technical data of the thermostat (transmitter):
— temperature measurement range: 5 to 35°C
(in 0.1°C increments)
— adjustable temperature range: 10 to 30°C
(in 0.5°C increments)
— temperature measurement accuracy: ±0.5°C
— selectable switching sensitivity: ±0.2/±0.3°C
— defrosting temperature: +7°C
— storage temperature: -10°C to +60°C
— power supply voltage: 2x1.5 V AA alkaline batteries
(LR6 type)
— operating frequency: 868.35 MHz
— power consumption: 1.5 mW
— battery lifetime: approx. 1 year
— dimensions: 112 x 75 x 45 mm
— weight: 154 g
— temperature sensor type: NTC 10 KΩ±1% at 25°C
Technical data of the receiver unit:
— power consumption: 6W
— power supply voltage: 230V AC, 50Hz
— switchable voltage: 24V AC / DC, ÷ 250V AC; 50Hz
— switchable current : 6A (2A inductive load)
— transmission distance: approx. 50 m in open terrain
— weight: 150g
Total weight of the device: approx. 350 g
(thermostat+receiver+holder)
The COMPUTHERM Q3 RF type thermostat complies with the
requirements of standards EU EMC89/336/EEC; LVD 73/23/EEC;
93/68/EEC and R&TTE 1999/5/EC.