User Guide

  • Room temperature
    User Guide
  • Set temperature, inquiry
    User Guide
  • Set temperature, adjustment
    User Guide
    User Guide
  • Switch ON/OFF (frost protection enabled)
    User Guide
    User Guide

Operating indicators

  • Heating demand indicator
    Operating indicators
    Operating indicators
  • Frost protection
    Operating indicators
    Frost protection is not available in cooling operation
  • Fault indicator
    Operating indicators
  • Low battery indicator
    Operating indicators
    Operating indicators
    Operating indicators
    Operating indicators
  • Heat/cool changeover
    Operating indicators

Energy Saving ECO feature

  • Pressing the green ECO button gives a timed period at a different,
    predefined temperature (18°C)
    Energy Saving ECO feature
  • To set the ECO energy savings time period
    Energy Saving ECO feature
  • Display shows countdown of ECO time remaining
  • Pressing  or icon will now allow the ECO temperature to be changed
  • To exit ECO mode, press ECO button again

Installation

  1. Installation
  2. Installation

    = M3.5

    = No 6
    1. Installation
    2. Installation
    3. Installation
    4. Installation
    5. Installation
    6. Installation
  3. Installation
  4. InstallationInstallation
  5. InstallationInstallation
  6. Installation
  7. Installation

Installer Mode

  • To enter Installer Mode
    diagram
  • To select a parameter
  • Display
    icon
  • Parameter flowchart
  • To change a parameter
    diagram
  • To exit Installer Mode
    a close up of a sign

Parameters

DescriptionParameterRange of valuesDefault
Minimum ON/OFF timeOt1,2,3,4,5 m1 m
Cycle rateCr{3,6,9,12}6
Proportional band widthPb1.5 … 3.0 K1.5K
Temperature measurement offsettO3 … 3 K0 K
Upper setpoint limituL21 … 35 °C35°C
Lower setpoint limitLL5 … 21 °C5°C
ECO temperature / Temperatura ECOES5 … 35 °C18 °C
Heat/cool changeoverHC0, 10 = Disable
1 = Enable
Off setpoint adjustOS— (= Off), 5…16°C5°C
Electric heatEH0 (<3A) / 1 (3A – 8A)><3A) / 1 (3A – 8A)0 (<3A)
Reset parametersFS0 / 11 (factory)

For assistance with this product please visit livewell.honeywellhome.com

bk-electronic GmbH
Hardhofweg 40
74821 Mosbach
Germany
Country of origin: UK

Documents / Resources

Honeywell Digital Room Thermostat [pdf] User Guide
Digital Room Thermostat, THR840D

References

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