What purpose can the COMPUTHERM Q5RF room thermostat be used for?

The COMPUTHERM Q5RF 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 new 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 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 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.

Where to locate transmitting and receiving units of 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.). Its optimal location is at a height of 1.5 m from the floor level. The appliance can easily be snapped onto its base and then placed on any horizontal surface (e.g. table, shelf, top of a commode) or, using the screw holes on the back side, can be mounted to a wall as well.

It is reasonable to install the receiving unit of thermostat COMPUTHERM Q5RF in the vicinity of the boiler, at a place protected from moisture and heat. When selecting the location of the receiving unit please also consider that bulky metal objects (e.g. a boiler, buffer tank, etc.) and metal building structures may have an adverse effect on propagation of radio waves. If it is possible, in order to ensure trouble-free RF connection, we recommend that you install the receiving unit at a height of 1.5 to 2 m and at a distance of 1 to 2 m from the boiler or other bulky metal constructions. We recommend that you check reliability of RF connection at the place selected before installing the receiving unit. Do not install the receiving unit beneath the cover of the boiler or in the immediate vicinity of hot pipes or pumps because this may cause damage to the parts of the appliance and compromise the wireless (RF) connection. We also recommend that the power is preferably supplied to the receiving unit from a socket other than that of the boiler (and from another phase, if it is possible), and line power must not be supplied to the receiving unit from the boiler on any account. To prevent electric shock ask a professional to connect the receiving unit to the boiler.

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 NO-COM 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.

What type of appliances can be controlled by COMPUTHERM Q5RF?

COMPUTHERM Q5RF 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 or air-conditioning equipment which has a two-wire room thermostat connection point, irrespective of whether it has 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.

On the other hand, the receiving unit of the thermostat is operated on a 230 V power supply.

Will several wireless room thermostats used in the same flat not disturb each other’s operation?

No. Each thermostat and accompanying receiving unit(s) has its own security code which ensures reliable and trouble-free operation of the appliances. Each receiving unit receives signals only from the thermostat that has the same security code. As a result, practically unlimited number of appliances can be used in the immediate vicinity of each other without causing any problem in the communication between the devices.

Can Q5RF 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)
  • unstable RF connection (see details below)
  • somebody  has  desynchronized  the  receiving  and  transmitting  units  and  they  should  be resynchronized (the steps of resynchronization are described in the Instruction Manual).

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 NO or COM 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.

At the zone outputs of the receiver unit (L1-N1, L2-N2, L3-N3 and L4-N4) the 230 V appears when the thermostat of the zone switches.

What causes the unstable RF connection?

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
  • too large distance or too many obstacles (e.g. several reinforced concrete ceilings, several thick walls, etc.) between the transmitter and the receiver
  • incorrect location of the transmitting or receiving unit of the thermostat (see above for details)
  • some other RF device that transmits stronger than normal is being used in the vicinity of the appliance (certain baby monitors and wireless headphones, as our experience indicates)
  • some other external disturbing factor (e.g. a high performance antenna on the rooftop or within striking distance)

Some of the problems (e.g. too large distance or too many obstacles between the transmitter and the receiver) can be solved by using a COMPUTHERM Q2RF signal booster plug.

How will the appliance continue to operate after a power outage?

After power supply is restored, at the beginning the output of the receiving unit is always in off mode. However, since the transmitting unit repeats its current switch command every 5 minutes, the control of the heating/cooling system will return to the mode set earlier after 5 minutes at the latest.

What should I do when the transmitter does not communicate with the receiver or this communication is unsteady?

There may be several reasons why the transmitter does not communicate with the receiver or this communication is unsteady. To solve the problem, we recommend that you adopt the following proposals:

  • Replace the battery in the transmitting unit of the thermostat. Remember that only new alkaline batteries may be used for the appliance. 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.
  • Check whether the two units have been synchronized. If the two units fail to communicate even when they are very close to each other then they should probably be resynchronized according to the Instruction Manual.
  • Place  the  transmitter  and  receiver  of  the  thermostat  closer  to  each  other  or  put  a COMPUTHERM Q2RF signal booster plug preferably at a point midway between the two units, if you think that they are too far apart.
  • Check that the receiving and transmitting units of the thermostat have been installed in accordance with the specification. If not, relocate them according to the Manual (see above for details).
  • Avoid using certain RF devices that transmits stronger than normal in the vicinity of the appliance (certain baby monitors and wireless headphones, as our experience indicates).

Can a single thermostat be synchronized with several receiving units simultaneously?

Yes.  COMPUTHERM  wireless  thermostats  are  able  to  control  several  RF  units  simultaneously, including Q1RX plug, Q3RF and Q7RF receiving units. To choose the right zone number press and hold the LEARN and RESET buttons simultaneously inside the thermostat, then release the RESET button while holding the LEARN button for 5 more second. On the display the U:1, U:2, U:3 or U:4 signs will appear showing which zone is selected. Choose the right zone by pressing the +/- buttons and then press and hold the LEARN button inside the thermostat for 3 until LEDs on the receiving units stop blinking. If you wish to use the Q5RF (TX) thermostat with other COMPUTHERM product instead of Q5RF receiver unit, make sure to set the thermostat to U:1 zone for synchronization. To see how to choose  the  zone  number  for  the  thermostat  Instructions  for  installing  and  operating  Q5RF thermostat is available at the following website: https://www.computherm.info/en/computherm-q5rf-digital-room-thermostat/

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 higher after a short while, and when you rotate it anticlockwise the displayed temperature will become lower.

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