Installation and Setup
Installer setup
25.0° C
Press and hold both buttons for 5 seconds
I0SE
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Function Setting
Installer settings allow you to customise how your system works. Check the tables on pages
To change installer settings:
1Press and hold the ON/OFF button for 5 seconds.
2Press and hold the p and q buttons together until the screen changes.
3Press the p or q buttons to scroll through functions quickly until you find one you want to change (see list on pages
4To change any setting, press the ON/OFF button, then press the p or q buttons until the correct value is flashing.
5Press the ON/OFF button again to save your choice, then use the p or q buttons to select another function.
To exit installer setup, press and hold the ON/OFF button for 5 seconds.
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| homexperttm by Honeywell THR840DUK Digital Thermostat | |
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Installer setup functions |
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| ** Factory default setting | |
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Function | Description | Setting Options |
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1: Ot | Minimum boiler on/off time | 1 minute ** |
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| Options: 1 to 5 minutes |
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| See page 23 for important information |
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2: Cr | Cycles per hour (CPH) | 6 cycles per hour ** |
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| Options: 3, 6, 9 or 12 |
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| See page 23 for important information |
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3: Pb | Proportional band width | 1.5°C ** |
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| Options: 1.5° to 3°C |
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4: tO | Temperature offset | 0: No offset ** |
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| Options: +3° to |
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5: uL | Maximum temperature allowed | 35°C ** |
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| Options: 21° to 35°C |
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6: LL | Minimum temperature allowed | 5°C ** |
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| Options: 5° to 21°C |
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NOTE: See descriptions of functions on page 24.
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