Filter
Top Products
Installation and Setup
22
homexpert
tm
by Honeywell THR840DUK Digital Thermostat
23
Installer setup functions
Function Description Setting Options
7: ES ECO default temperature 18°C **
Options: 5° to 35°C
8: HC Heating/Cooling options 0: No central cooling system installed **
1: Allows switching between heating and cooling systems
Thermostat cannot control cooling unless you select 1
9: OS Frost protection temperature 5°C **
Options: — (none) or 5° to 16°C
10: EH Electric heat 0: Resistive loads <3 A **
1: Resistive loads 3 to 8 A
See page 23 for important information
11: FS RESET TO FACTORY DEFAULT 0: No change
1: Select 1 to restore default settings. All customised
settings will be lost.
Enter Installer Setup (see page 27), then press p or q for access to system settings
NOTE: See descriptions of functions on page 24.
Customised settings for your system
Your heating system Changes required Setting Options
Standard gas boiler
(<30kW)
None No change
Zone Valve None No change
Oil boiler Function 1: Ot
Function 2: Cr
Set to 4 minutes
Set to 3 CPH
Thermal actuator Function 2: Cr Set to 12 CPH
Electric heating Function 2: Cr
Function 10: EH
Set to 12 CPH
Set to 1 if load > 3A
Your cooling system Changes required Setting Options
Heat pump/air conditioner Function 1: Ot
Function 2: Cr
Function 8: HC
Set to 4 minutes
Set to 3 CPH
Set to 1
Fan coil Function 8: HC Set to 1
NOTE: After changing the above settings to accommodate a cooling system, you can switch the thermostat to
control either heating or cooling (see page 9).