Computherm q3rf User manual

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

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 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 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
thethermostatandtheboiler.Thetwounitshavebeentunedinthe
factory so that they operate at the same frequency. The trouble-
free 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 modication 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

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:

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
onthedisplay,pressthe„RESET”buttonwithawoodenorplastic
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 modied
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 modied 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 efciency and hence increases
the gas consumption. Werecommend usingthe ±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).
3.2 Switching between the Heating and Cooling Mode
Theheatingorthecoolingmodeofthethermostatcanbeselected
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.
Withfactorydefaultsettingsthejumperislocatedonthecentraland
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 modied so that the display alternately shows
the current room temperature and the adjusted temperature for 4
seconds,respectively.Inthismode,thenotices“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 modication of the basic settings was done
after inserting the batteries and the modications 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. After installing
the receiver unit, the two units
should be synchronised by
pressing the “LEARN” button
next to the batterycompartment
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.
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4. SETTING THE DESIRED TEMPERATURE
Afterputtingthethermostatintooperationandadjustingthebasic
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 efciency 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.)
Thefactorydefaulttemperatureis18°Cfortheeconomy(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
bottomrightcornerofthedisplay.Meanwhile,thetemperature
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 EconomyMode(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 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
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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. 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 2). 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 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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