HQ HQ-TH21 Digital Thermostat - fea

HQ HQ-TH21 Digital Thermostat User Manual


HQ HQ-TH21 Digital Thermostat  

HQ- HQ-TH21- Digital- Thermostat-pro


  • Auto Restart.
  • Blue Backlight

HQ- HQ-TH21- Digital- Thermostat-1


  • Sensing element: NTC
  • Display: LCD
  • Power consumption: < 2 W
  • Set-point range: Room: 5°C to 35°C
  • Accuracy: ± 1°C
  • Button: Touch pad
  • iP Fixing screw width: 60 mm
  • Housing: ABS + PC flame retardant
  • Switch current rating: < 2 A (resistive load) < 1 A (inductive load)
  • Power supply: 230 V AC, 50/60 Hz (HQ-TH21) 24 V AC, 50/60 Hz (HQ-TH22)
  • Dimensions: 86 * 86 * 13 mm (W * H * D)
  • Operating rating: 0~40°C, 5~95% RH (non-condensing)
  • Control performance: On/Off control, 2°C differential

MountingHQ- HQ-TH21- Digital- Thermostat-2

Screw terminals: 2 x 1.5 mm2 or 1 x 2.5 mm2, min. (0.5 mm2)

  • Room Temperature
  • Under Heating
  • Electric Heating
  • On/Off
  • Mode
  • Up
  • Down

HQ- HQ-TH21- Digital- Thermostat-3

Wiring DiagramsHQ- HQ-TH21- Digital- Thermostat-4

Power on/off
To turn thermostat on or off, press HQ- HQ-TH21- Digital- Thermostat-6

Frost mode (thermostat off)
To enable this operation:

  • With thermostat turned off
  • Press “M” for 3 seconds
  • Select 01 (00 = disabled)

When enabled and the thermostat has been turned off, the HQ- HQ-TH21- Digital- Thermostat-7 icon will be showing and the heating will be activated if the room temperature is lower than 5°C; heating will stop if the room temperature is higher than 7°C.

Temperature calibrating

  • With thermostat turned off, Press “▲” and “▼” for 3 seconds. The display will show the actual temperature.
  • Press “▲” or “▼” to adjust the temperature to the correct value.
  • Press “ ” to turn off. The calibration setting will now be stored.

Normal operating mode

  • RT: When the thermostat is in operating mode, RT is displayed and indicates Room Temperature.
  • SET: Pressing the UP or DOWN key once will display SET and the current set-point temperature. You are able to increase/decrease the set-point temperature using the UP/DOWN keys. This temperature change is only temporary and will be maintained only until the next programmed setting.

Clean only with a dry cloth. Do not use cleaning solvents or abrasives.

No guarantee or liability can be accepted for any changes and modifications of the product or damage caused due to incorrect use of this product.


  • Designs and specifications are subject to change without notice.
  • All logos brands and product names are trademarks or registered trademarks of their respective holders and are hereby recognized as such.
  • Keep this manual for future reference.

This product is marked with this symbol. It means that used electrical and electronic products should not be mixed with general household waste. There is a separate collections system for these products.



HQ HQ-TH21 Digital Thermostat User Manual


HQ HQ-TH21 Digital Thermostat User Manual





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