COMPUTHERM Q72

Programmable digital room thermostat

Using the COMPUTHERM Q72 room thermostat, separate temperature programs can be prepared for each day of the week. It is possible to set 1 + 10 switching times per day. There are 3 different options for temporarily changing the temperature specified in the program. The thermostat provides the possibility to choose the switching sensitivity, calibrate the temperature sensor, activate the pump protection function, easily switch between the heating and cooling modes and lock the control buttons. The thermostat’s large display is equipped with an activable backlight, the brightness of which can be configured.

We recommend using it in places where there is a need for programmability, furthermore accurate temperature measurement, accurate temperature setting and switching sensitivity is important.

Important functions:

  • Separate independent daily programs can be created for each day of the week
  • For each day, beside 1 fixed switching time, 10 freely adjustable switching times can be set, and a different temperature can be assigned to every switching time
  • Use of manual modes
  • Temporary manual mode: until the next program switching, for 1 to 99 hours and for 1 to 99 days
  • Selectable switching sensitivity
  • Calibration of internal thermometer
  • Pump protection function
  • Easy switching between cooling and heating modes
  • The thermostat’s large display is equipped with an activable backlight, the brightness of which can be configured

Technical data:

  • Temperature measurement range: 0 to 45 °C (in 0.1 °C increments)
  • Adjustable temperature range: 5 to 40 °C (in 0.5 °C- increments) 
  • Temperature measurement accuracy: ±0.5 °C 
  • Temperature calibration range: ±3 °C (in 0.1 °C increments)
  • Selectable switching sensitivity: ±0.1 °C to ±1.0 °C
  • Switchable voltage: max. 30 V DC / 250 V AC
  • Switchable current: 5 A (1A inductive load)
  • Battery voltage: 2 x 1.5 V alkaline batteries (LR6 type; AA size)
  • Protection against environmental impacts: IP30
Computherm - Digitális termosztátok - COMPUTHERM Q72 - Quantrax Kft.
Computherm - Digitális termosztátok - COMPUTHERM Q72 - Quantrax Kft.
Computherm - Digitális termosztátok - COMPUTHERM Q72 - Quantrax Kft.

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FAQ: 

What purpose can the COMPUTHERM Q72 room thermostat be used for?

The  COMPUTHERM  Q72  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 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 Q72?

COMPUTHERM Q72 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.

Is there a need for 230 V power supply for the operation of the thermostat?

It is not needed for the operation of the transmitting unit of the thermostat, you only need two 1.5 V alkaline batteries (type: LR6, size: AA) for this purpose.

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 receiver unit. For a more detailed description please refer to the Instruction Manual of the product.

Can Q72 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 to switch the thermostat into cooling mode?

Out of the buttons located on the front panel of the thermostat press once the SET button briefly then press the SET button again and hold it down and in the meantime press the COPY button briefly. Now lettering HEAT or COOL appears on the display to indicate the selected mode. Then you can switch between operating modes with +/- buttons.

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?

Out of the buttons located on the front panel of the thermostat press once the SET button briefly then press the DAY button briefly and, right after that, press the HOLD button. Now lettering CAL appears on the display and with +/- buttons you can modify the displayed temperature compared to the measured value.

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 Q72 thermostat are available at the following website: Instruction Manual.