Honeywell ST9400C Manual

Honeywell ST9400C Manual - Your Honeywell ST9400C provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle. The ST9400C does not directly control the temperature but works together with other temperature controls, such as room thermostats and cylinder thermostats, to control your heating and hot water system in your home. With 7-day programming and up to 3 on/off periods per day, every day can be set differently, and heating and hot water can be set at different times from each other. The following instructions explain how to programme and use the ST9400C to provide the most home comfort at the least cost. Your ST9400C should have been set up to work correctly when it was installed. However, the following will show you how you can modify your settings to meet your particular lifestyle. To assist you with programming and everyday use your ST9400C will display text messages at every stage to help you get the most out of your central heating and hot water system. The ST9400C uses LoTTM Technology to constantly update the display to give you feedback about what is required.
Honeywell ST9400C Manual

Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central heating and domestic hot water on and off at the same time, while others allow the domestic hot water and heating to come on and go off at different times. Set the ‘On’ and ‘Off’ time periods to suit your own lifestyle. On some programmers you must also set whether you want the heating and hot water to run continuously, run under the chosen ‘On’ and ‘Off’ heating periods, or be permanently off. The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time. You may be able to temporarily adjust the heating programme, for example, ‘Override’, ‘Advance’, or ‘Boost’. These are explained in the manufacturer’s instructions. The heating will not work if the room thermostat has switched the heating off. And, if you have a hot-water cylinder, the water heating will not work if the cylinder thermostat detects that the hot water has reached the correct temperature.

Home energy use is responsible for more than 1⁄4 of the total UK carbon emissions which contribute to climate change. Heating and hot water systems based on boilers account for of this figure, so it is important to understand how your controls can help to maximize energy efficiency while maintaining your comfort. Your Programmer should be used in conjunction with appropriate temperature controls. In order to save energy the following general points should be observed: Ensure your system contains a room thermostat and a hot water thermostat, and that both are set to appropriate temperature levels: typically 20°C for the room temperature and between 55 - 60°C for the hot water temperature. Programme your heating and hot water to be off when you are not in the house. If you are concerned about possible frost damage to any exposed pipe work, it is advisable to fit a frost protection system – your installer can advise you about this. Think about how you use your domestic hot water – if you have a storage system, it is not necessary to have this switched on all the time, even when you are in the house. Consider the heat up times required for your central heating. Every home responds differently when the heating is switched on. Adjust the start time so that you are not cold when you get up in the morning. A shorter heat up time is required for other heating periods. In the evening, when the house is up to temperature, it is often possible to switch off the heating up to an hour before you go to bed, without any noticeable reduction in comfort.

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