Digital room thermostat

It cannot be programmed but as compared to simple mechanical thermostats, measuring and adjusting temperature becomes significantly more accurate with its digital display. It enables you to set an economy and a comfort temperature, to select the switching sensitivity and to switch between the heating and cooling mode.
We recommend using it in places where programmability is not required, but accurate temperature measurement, accurate temperature setting and switching sensitivity is important.

Important functions:

  • Accurate temperature measurement
  • Simple switching between comfort and economy temperature
  • Selectable switching sensitivity
  • Calibration of internal thermometer
  • Easy switching between cooling and heating modes

Technical data:

  • 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
  • Temperature calibration range: approx. ±4 °C
  • Selectable switching sensitivity: ±0.1 °C; ±0.2 °C
  • Switchable voltage: max. 30 V DC / 250 V AC
  • Switchable current: 8 A (2 A inductive load)
  • Battery voltage: 2 x 1.5 V AA ALKALINE batteries (LR6 type)


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Take a look at our videos displaying the use of the product: 

What purpose can the COMPUTHERM Q3 room thermostat be used for?

The  COMPUTHERM  Q3  room  thermostat  has  been  specifically  designed  to  control  heating  and cooling systems. In addition, the thermostat is also suitable for controlling electrical and electronic devices which can be turned on and off by interrupting and resuming power supply.

What type of battery should be used for the thermostat? 

Two 1.5 V alkaline batteries (type: LR6, size: AA) are required for the operation of the appliance. Only good quality alkaline batteries may be used. Other batteries known as durable or long life batteries (conventional  carbon-zinc  batteries),  half  dead  batteries  and  chargeable  accumulators  are  not suitable for the operation of this appliance.

What is the expected lifetime of the batteries when they are used for the thermostat?

In normal use the expected lifetime of the batteries is approx. 1.5 to 2 years.

What does bA icon which is alternately shown in place of the temperature on the display mean?

It means that battery voltage is low and the batteries should be replaced.

What means lettering LO or HI that appears in place of the measured temperature on the display?

It means that the temperature measured by the appliance falls outside the measurement range of the temperature sensor: LO indicates that the temperature is too low, while HI shows that the temperature is too high. This may occur when the appliance is in an extremely cold or warm environment or the temperature sensor suffers a physical damage (e.g. it gets crushed with the effect that the two pins of the temperature sensor touch or the temperature sensor breaks off) or the temperature sensor becomes defective for some other reason.

What type of appliances can be controlled by COMPUTHERM Q3?

COMPUTHERM Q3 type switching-mode room thermostat is able to control vast majority of the boilers and air-conditioning equipment available on the Hungarian market. It can be easily connected to any gas boiler having a two-wire thermostat connection point and to any air conditioning apparatus or electrical apparatus, regardless of whether they have a 24 V or 230 V control circuit. In addition, the thermostat is also suitable for controlling electrical and electronic devices which can be turned on and off by interrupting and resuming power supply.

Do you need 230 V mains supply for the operation of the thermostat?

No. Two 1.5V alkaline batteries (type: LR6, size: AA) are required for the operation of the thermostat.

Where to locate the thermostat?

It is expedient to locate the thermostat on the wall of a room where you stay regularly or a long period of time so that the thermostat is oriented in the direction of the natural ventilation of the room but is not exposed to draught or extreme heat (e.g. sunlight, refrigerator, chimney, etc.). Do not use in wet, chemically aggressive or dusty environment. Its optimal location is at a height of 0.75-1.5 m from the floor level.

How to connect the thermostat?

The appliance must be installed / put into service by a competent person. The device to be controlled should be connected to 1-2 connection points located on the back side of the thermostat. For a more detailed description please refer to the Instruction Manual of the product.

Can Q3 be used for air-conditioning equipment?

Yes. You can switch between heating and cooling modes of the thermostat. According to the selected switch sensitivity, in cooling mode the thermostat will turn on the air-conditioning equipment above the set temperature and turn it off below this temperature.

How can the thermostat be switched to cooling mode?

Move the jumper inside the thermostat from its default setting (Heat) to position Cool.

Why does the thermostat not switch the heating system?

There are various reasons for this. The most frequently encountered problems are:

  •     unsuitable batteries (e.g. dead batteries or non-alkaline batteries) are being used
  •     incorrect connection (which, in unfortunate cases, can destroy the relay in the appliance or the electronic system of the controlled device)
What should I do when the appliance switches but 230 V mains voltage does not appear at its output? 

The appliance has potential free (voltage free) output connection points therefore 230 V voltage normally does not appear at its outputs, it only links the two connected wires or disrupts the connection between them. If you want 230 V voltage to appear at the output of the appliance when it is switched off then you have to connect a mains phase wire to connection point 1 or 2 of the appliance according to the Instruction Manual. Before connection the phase wire must be de- energized and the connection must be carried out by a competent person.

 What should I do if I am of the opinion that the thermometer of the thermostat measures inaccurately?

Inside the thermostat there is an orange-coloured potentiometer that can be adjusted by a screwdriver. When you rotate the potentiometer clockwise then the displayed temperature will be lower after a short while, and when you rotate it anticlockwise the displayed temperature will become higher.

Where you can buy it?

Search  this  product  at  our  reseller  partners.  The  list  of  our  reseller  partner  is  available  at  the following link: Partners

Where you can find the Instruction Manual of the appliance?

Installing and operating instructions for the Q3 thermostat are available at the following website: Instruction Manual.