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Operating Instructions
NEW
software!
COMPUTHERM
Q3RF
wireless (radio-frequency) digital
room thermostat
For Evaluation Only.
Copyright (c) by Foxit Software Company, 2004
Edited by Foxit PDF Editor
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GENERAL DESCRIPTION OF THE THERMOSTAT
The
COMPUTHERM
Q3RF 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 circ uit .
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 exactly the opposite way.
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 troublefree operation is ensured by its own security code. The installation
and connection of the receiver unit is described in Section 7.
To increase the lifetime of the batteries, the thermostat will not
transmit signals continuously. Instead it will repeatedly transmit
the actual signal every 5 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 buildings are being modernized,
the optimal location of the device can be selected during –
operation,
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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 50m 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 difference 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 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 3.1 for the modication of the factory default switching
sensitivity of ±0.2°C.
This wireless (radio-frequency) thermostat can also be easily
extended with the
COMPUTHERM
Q1RX socket if needed,
with which the thermostat is able to control boilers or any other
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230V AC
50-60 Hz
230V AC
50-60 Hz
Boiler
Receiver
Unit
Thermostat
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electrical devices operating on 230V (50Hz; max. 10A) (e.g.
fan heaters, pumps, zone valves, etc.) according to the room
temperature.
1. LOCATION OF THE DEVICE
The thermostat of the
COMPUTHERM
Q3RF 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.
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.
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Temperature
Temperature
measurement unit
Room temperature
is displayed
Set temperature
is displayed
Sign of heating
Sign of cooling
The information shown on the liquid crystal
display of the thermostat
includes the following:
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2. PUTTING THE THERMOSTAT INTO OPERATION
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 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 compartment.
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 with a wooden or plastic
stick. To press the button, do not use any electrically conductive
materials, e.g. graphite pencil).
3. BASIC SETTINGS
After removing the rear panel of
the device, the following factory
default settings can be modied
by relocating the jumpers (black
plugs) located on the base
panel.
3.1 Selecting the Switching Sensitivity (Accuracy)
The switching sensitivity of the thermostat can be selected or
adjusted by the uppermost jumper.
With factory default settings the jumper is located on the central
and right pins, resulting in a switching sensitivity of ±0.2°C. It can
be modied to ±0.1°C by relocating the jumper onto the left and
central pins. A smaller switching sensitivity results in steadier
room temperature and therefore in higher comfort. The heat
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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 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 efciency and hence increases
the gas consumption. We recommend using the ±0.1°C switching
sensitivity for heating systems with high thermal inertia (e.g.
underoor heating), and the ±0.2°C switching sensitivity (factory
default setting) for heating systems with low thermal inertia (e.g.
at panel radiators).
3.2 Switching between the Heating and Cooling Mode
The heating or the cooling mode of the thermostat can be selected
by the central jumper.
With factory default settings the jumper is located on the central
and right pins, which selects the heating mode. By relocating the
jumper onto the left and central pins, the cooling mode can be
selected. The output terminals No. 1 and No. 2 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). The closed state of
the output terminals No. 1 and No. 2 are indicated by the notice
„HEAT” (heating) or „A/C” (cooling) in the bottom left corner of
the display, according to the selected mode.
3.3 Selecting the Displayed Temperature
The temperature(s) to be shown on the display can be selected
and set by the bottommost jumper.
With factory default settings the jumper is located on the central and
right pins, in which case the display shows the currently measured
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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 left and central pins the displayed
temperature can be modied so that 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.
ATTeNTION! If the modication of the basic settings was done
after inserting the batteries and the modications did not take
effect, please press the “ReSeT” button with a small wooden or
plastic stick to activate them. To press the button, do not use any
electrically conductive materials (e.g. graphite pencil).
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. A fter inst allin g
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
proces s of synch roni sat io n is de sc ribed in Secti on 7. 2 .
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4. 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.
Above 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 35°C, in steps of 0.5°C.
For energy efciency 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, keeping a at 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 de fault 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 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.
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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.
5. OPERATION OF THE INSTALLED THERMOSTAT
After setting the economy and comfort temperatures, the
temperature 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 the change in ro o m temperature and
temperature setting, the thermostat controls (switches on or
off) the boiler or any other equipment connected to it. When
activated, the n ormally open contact pairs, i.e. No. 1 (NO) and
No. 2 (COM), of the relay of the thermost at 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, respect ively.
5.2 Comfort Mode (
☼
) ( right hand position of the swi tch)
In the right hand position of the switch, the thermostat provides
the set comfort temperature (e.g. daytime temperature) to be
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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 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. BATTERY REPLACEMENT
The average lifetime of the batteries is 1 year. T he 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 Secti o n 2). After bat tery repl ac em ent, the des ired
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 and heat, in the vicinity of the boiler.
ATTeNTION! Do not install the receiver unit under the housing of
the boiler or near hot pipes because it may damage the parts of the
device or compromise wireless (radio-frequency) connection. To avoid
electric shock, entrust a specialist with connecting the receiver unit to
the boiler!
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Unscrew the two screws at the bottom of the receiver unit without
removing them. Following this, remove the front panel of the
receiver unit then x 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 the plastic above
the connection points: N, L, 1, 2 and 3.
230V mains voltage should be supplied to the receiver unit.
This provides the power supply for the device, but this voltage
does not appear on the terminals 1 and 2. We propose to
connect the neutral wire of the network to point N, while the
phase conductor to point L. We recommend using a fork type
connection including a switch for mains connection. Please deenergize the device when heating is continuously not needed
(e.g. summer).
The receiver unit controls the boiler or air conditioner through a
potential-free alternating relay whose connection points are: 1
(NO), 2 (COM) and 3 (NC). Connect the two connection points
of the heating or cooling equipment to be controlled to terminals
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Heating unit (boiler)
Rear panel
of the
receiver unit
N
L
(phase)
230V AC
50-60 Hz
230V AC
50-60 Hz
LN 1 2 3
COM
NO NC
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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) connection points of the thermostat should be
connected to the mains cable of the device, similarly as a switch
would be connected.
ATTeNTION! Always consider the loadability of the receiver unit
and follow the manufacturer’s instructions of the heating or cooling
equipment. The device must be installed and connected by a
qualied 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 signicance, the receiver unit may
be installed either near the boiler or far away from it, but do not
install it under the housing of the boiler.
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 operating
frequency. To try the system in heating mode, 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
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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 ashing. 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 ashing
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 device 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 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 receiver unit is outside the transmission distance of
the wireless (radio-frequency) transmitter, thus they have to be
placed closer to each other.
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7.4 Manual control of the receiver unit
Pressing the “M ANUAL” button separates the thermostat from
the receiver unit. In this case, the boiler or air conditioner
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 device quits manual control and resumes automatic
(thermostat-controlled) operation (the green LED goes out).
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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: 5 to 35°C (in 0.5°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
— operating frequency: 868.35MHz
— dimensions: 112 x 75 x 45mm (without holder)
— weight: 154g
— temperature sensor type: NTC 10kΩ ±1% at 25°C
Technical data of the receiver unit:
— power supply voltage: 230V AC, 50Hz
— power consumption: 6W
— switchable voltage: 24V AC/DC to 250V AC, 50Hz
— switchable current: 6A (2A inductive load)
— transmission distance: approx. 50m in open terrain
— weight: 150g
Total weight of the device: approx. 500g
(thermostat+receiver+holder)
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