Quantrax COMPUTHERM Q20 User manual

COMPUTHERM Q20
Programmable, digital room thermostat
Operating Instructions

TABLE OF CONTENTS
1. A general description of the thermostat 4
2. Important warnings and safety recommendations 6
3. Information appearing on the display of the thermostat 7
4. Location of the thermostat and receiver unit 8
5. Putting the thermostat into operation, basic settings 8
5.1. Commissioning the thermostat 8
5.2. Connection of the receiver unit 11
6. Operation of the thermostat that has been put into operation 13
7. Settings 17
7.1. Selecting the operating mode (FUNC) 17
 7.2. Switchingonando󰀨oftheprogrammedmode(PROGRAM)  17
 7.3. Selectingswitchingsensitivity(HYSTER) 18
 7.4. Calibrationofthetemperaturesensor(TCALIB) 19
 7.5. Calibrationofthehumiditysensor(HCALIB) 19
 7.6. Settingthehumiditylimitforcooling(HLIMIT) 19
 7.7. Switchingonando󰀨ofthepumpprotectingfunction(PUMP) 20
 7.8. Restoringfactorydefaultsetting(RESET) 20
8. Operating modes of the device 21

8.1. Economy mode ( ) 22
8.2. Comfort mode ( ) 22
 8.3. Manualmode( ) 23
 8.4. Programmedmode( )23
  8.4.1.Adescriptionofprogramming 23
8.4.2. Steps of programming the device 27
8.4.3.Theuseof“COPY”function(copyingtheprogramofadaytoanotherdayorotherdays) 30
  8.4.4.Modifyingtheprogramsofthedevice 32
  8.4.5.Programinspection 33
8.5. Temporary manual mode until the next program switching 34
 8.6. Temporarymanualmodefor1to99hours(partyprogram) 35
 8.7. Temporarymanualmodefor1to99days(holidayprogram) 36
9. Operation of backlight 38
10. Locking the control buttons 38
11. Battery replacement 39
12. Technical data 42

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A GENERAL DESCRIPTION OF THE THERMOSTAT
The COMPUTHERM Q20 type switch mode room thermostat is suitable
for regulating a large majority of boilers, air conditioners, humidiers and
dehumidiers in circulation in Hungary. It can easily be connected to any
gas boiler, air conditioner, humidier and dehumidier with two-wire room
thermostat connection point and to other electrical devices, regardless of
whether the device has a 24 V or 230 V control circuit.
230 V AC
50 Hz

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The device can be programmed as needed so that the heating/cooling or
humidier/dehumidier system heats/cools and humidies/dehumidies
your apartment or o󰀩ce to the desired temperature or humidity at the times
you want, and it contributes to the reduction of energy costs in addition to
providing comfort. Separate independent daily programs can be created
for each day of the week. For each day, beside 1 xed switching time
(PROG ) 10 freely adjustable (in 10 minutes increments) switching times
(PROG – PROG ) can be set, and a di󰀨erent temperature (in 0.5 °C
increments) and humidity (in 1 percent increments) can be assigned to
every switching times.
The simultaneous use of several COMPUTHERM room thermostats and one
COMPUTHERM Q4Z or Q10Z zone controller provides the possibility for the
thermostats to also control a pump or a zone valve in addition to starting the
heater or cooler. This way it is easy to divide a heating / cooling system into
zones, thanks to which the heating / cooling of each room can be controlled
separately, thus greatly increasing comfort. Furthermore, the zoning of the
heating / cooling system will greatly contribute to the reduction of energy costs,
as due to this only those rooms will be heated / cooled at any time where it is
required.

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2. IMPORTANT WARNINGS AND SAFETY
RECOMMENDATIONS
• Before starting to use the device, please study carefully the instructions for
use and follow strictly the instructions therein.
• The thermostat is designed for business or household (non-industrial)
use, it can be used to control any electrical device, the power of which
does not exceed 1.38 kW (load capacity: max. 30 V DC / 250 V AC; 6 A
[2 A inductive load]).
• This device is designed for indoor use. Do not use in wet, chemically
aggressive or dusty environments.
• The manufacturer will assume no responsibility for any possible direct or
indirect damages or income losses incurring during the use of the device
• The device does not work without power, but the thermostat can remem-
ber the settings. In the event of a possible power supply failure (power
cut/battery replacement), it can continue to operate without any external
intervention after the power supply is restored
• Before starting the actual control of the device connected to the
thermostat, make sure that the device works perfectly and can be-
operated reliably even when controlled by the thermostat.

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Figure 1
3. INFORMATION APPEARING ON THE DISPLAY
OF THE THERMOSTAT
Programming button
Current/left time
Programmed mode icon
Current program
Mode button
Menu button
Manual/temporary
manual mode icon
Icon indicating that the
party/holiday program is
switched on
Economy mode icon
Icon showing that
cooling is switched on
Icon showing that
heating is switched on Comfort mode icon
Room temperature
Battery charge level
indicator icon
Key lock button
Icon showing that the key lock is
switched on
Up/Down button
Measured humidity
Set temperature/humidity
Current day Icons showing that the humi-
ding/dehumiding is switched on

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4. LOCATION OF THE THERMOSTAT AND RECEIVER
UNIT
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 protec-
ted from drought or extreme heat (e.g. direct sunlight, refrigerator, chimney,
etc). Its optimal location is 0.75 - 1.5 m above oor level.
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 thermos-
tatic head may disturb the temperature control of the at.
5. PUTTING THE THERMOSTAT INTO OPERATION,
BASIC SETTINGS
5.1. Connection of the thermostat
WARNING! The device must be installed and connected by a qualied
professional.Beforeinstalling,makesurethatthatneitherthethermostat
orthedevicetobecontrolledisconnectedtothe230Vmainsvoltage.

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Modifyingthethermostatcancauseelectricshockorproductfailure.
Pressing the lock on the upper side of the housing of the thermostat, remo-
ve the back cover of the thermostat as shown in the gure
Fix the back of the device to the wall using the included screws and some
tools.
Remove the serial terminal cover from
the inside of the back panel using a small
screwdriver.
The receiver unit controls the boiler or
air conditioner through a potentialfree
alternating relay whose connection points
are: 1(NO), 2(COM) and 3 (NC). These
connection points are located on the inside
of the back panel, under an inner cover.
Connect the two connection points of the heating or cooling equipment to be
controlled to the normally open 1 (NO) and 2 (COM) terminals of the

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relay. If you would like to operate an old boiler or any other
device that has no connection points for thermostats, then
the 1(NO) and 2(COM) connection points of the thermostat
should be connected to the mains cable of the device, simi-
larly as a switch would be connected.
To avoid electric shocks, replace the inner cover
removed to connect the wires after installation.
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
qualied professional! The voltage appearing at terminals 1 (NO) and 2 (COM)
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 signicance.