Honeywell Home THR840D Digital Room Thermostat
Installation
Installer Mode
To enter Installer Mode
To select a parameter
Display
Parameter flowchart
To change a parameter
To exit Installer Mode
Parameters
| Description | Parameter | Range of values | Default |
| Minimum ON/OFF time | Ot | 1,2,3,4,5 m | 1 m |
| Cycle rate | Cr | {3,6,9,12} | 6 |
| Proportional band width | Pb | 1.5 … 3.0 K | 1.5K |
| Temperature measurement offset | tO | -3 … 3 K | 0 K |
| Upper setpoint limit
|
uL | 21 … 35 °C | 35°C |
| Lower setpoint limit | LL | 5 … 21 °C | 5°C |
| ECO temperature | ES | 5 … 35 °C | 18 °C |
| Heat/cool changeover | HC | 0, 1 | 0 |
| 0 = Disable | |||
| Off setpoint adjust | OS | — (= Off), 5…16°C | 5°C |
| Electric heat | EH | 0 (<3A) / 1 (3A – 8A) | 0 (<3A) |
| Reset parameters | FS | 0 / 1 | 1 (factory) |
Room temperature
Set temperature, inquiry
Set temperature, adjustment
Switch ON/OFF (frost protection enabled)
Heating demand indicator
Frost protection
Fault indicator
Low battery indicator
Heat/cool changeover
Energy Saving ECO feature
Pressing the green ECO button gives a timed period at a different, predefined temperature (18°C)
To set the ECO energy savings time period
The display shows a countdown of ECO time remaining
- Pressing
or 
will now allow the ECO temperature to be changed
To exit ECO mode, press the ECO button again
To exit ECO mode, press ECO button again
For assistance with this product please visit livewell.honeywellhome.com
bk-electronic GmbH
Hardhofweg 40 74821 Mosbach
Germany Country of origin: UK
©2019 Resideo Technologies Inc. This product is manufactured by Resideo and its affiliates. The Honeywell Home trademark is used under license from Honeywell International Inc. All rights reserved.
REFERENCE
Download Manual
Honeywell Home THR840D Digital Room Thermostat User Guide
