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