Operation
On/off switch and frost protection
homexperttm by Honeywell THR840DUK Digital Thermostat
Heating or cooling control
25.0° C
Press and hold to turn on or off
Press the ON/OFF button as shown at left to turn the thermostat on or off. When off, the thermostat will never activate the cooling system, and will activate heating only if necessary to maintain a minimum indoor temperature of 5º C (frost protection).
You can change the frost protection temperature to any level between 5º and 16º C, or turn this feature off so the heating system is never activated when the thermostat is off (see page 22).
Press and hold both buttons for 5 seconds
25.0° C
Heating changes to cooling
The thermostat is
To switch between heating and cooling, press and hold the p and q buttons together until the screen changes.
NOTE: The thermostat will not switch to cooling control unless you enable this feature (see page 22).
NOTE: When you change the system, the “Heating” and “Cooling” symbols will appear for a few seconds, then disappear. Normally, these symbols appear only when the heating or cooling system is running.
| 5.0°C |
System maintains | Symbol appears when |
minimum | thermostat is off |
temperature when |
|
thermostat is off |
|
25.0° C
8 | 9 |
