A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Ambient temperature This is the air temperature within a 21 ºC room at any given time. It depends on a number of factors, such as the outside temperature generated by the weather, the number of people in the room and whether or not the windows are double-glazed. 10 15 20 25 30 Automatic bypass valve As rooms approach the required temperature and devices such as thermostatic radiator valves (TRVs) start to close in the heating system, an automatic bypass valve opens at the same time (proportionally) to enable a safe flow of water around the boiler. Analogue Room Thermostat This type of thermostat has a dial measurement system as opposed to the digital display on a digital room thermostat. It reads temperature by measuring the rate a metal coil or a gas-filled diaphragm expands and contracts. Analogue room thermostats are often hard wired into the heating system. Also known as a mechanical room thermostat. Find out about Honeywell s wired thermostats

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Boiler A device that heats water, providing heating and hot water in your house. In a stored hot water system, the boiler heats hot water and stores it in a hot water cylinder. This hot water is replenished when it is used or cools to below a certain temperature, and is controlled by a cylinder thermostat and a time switch or programmer. Boiler interlock A term used to describe the action that takes place when the boiler is turned on or off. A combination boiler in a combi boiler based system provide domestic hot water on demand by heating the water as and when required.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Call for heat This industry term simply refers to the signal that heating controls send when they want the boiler to fire and provide heating or hot water. Combi boiler based system This is an efficient central heating system in which hot water is supplied on demand from a heat source within the boiler. Comfort level This term describes the ideal household temperature to keep you comfortably warm without being too hot or cold.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Cylinder tank This copper or stainless steel tank is used to store hot water, can usually be found in an airing cupboard or kitchen and is often insulated to increase heat retention. Also known as a hot water cylinder and hot water tank Cylinder thermostat To avoid scalding, this control is used on vented cylinders to measure the temperature of the hot water that is used for cleaning, showering, bathing and washing. The thermostat is usually mounted onto a bare area of metal on the hot water tank and fastened using a wire band. It can be powered wirelessly or by a fixed wire. On unvented cylinders, the cylinder thermostat is an insertion type that is inserted into the tank via a well built into the tank at manufacture. Unvented cylinders also require additional safety controls See Honeywell s range of cylinder thermostats

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z DECC The Department of Energy & Climate Change (DECC) works to make sure the UK has secure, clean, affordable energy supplies and promote international action to mitigate climate change. Read more about DECC Digital room thermostat Digital thermostats have no moving parts and use a simple device called a thermistor to accurately measure room temperature. They have an LCD screen showing the current temperature/setting. Honeywell s programmable digital thermostats also display the time, date and day of the week. Digital thermostats are either wireless (battery operated) or wired into the heating system, and advanced models have touch screens and can control heating systems with zoning. See 10 reasons why you should upgrade old controls

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ECO button One press of this button will bring the central heating down to a pre-set energy saving level for one hour. So if you are too hot you can conveniently and quickly reduce the room temperature without altering your pre-set heating temperature. The ECO button is found on the DT90 and DT92 wired and wireless room thermostats from Honeywell. Extra hour button This button on modern Honeywell time controls can switch your heating on (or extend the programmed on period) for up to 3 extra hours without altering the pre-set programme, giving you extra comfort. See Extra Hour animation See ECO button animation

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Firing the boiler This is what happens when the heating controls tell the boiler to provide heat for heating or hot water the boiler fires. Frost protection Internal pipes are vulnerable to freezing in harsh weather. Frost protection is the setting up of thermostats to ensure that if the temperature drops below a pre-set lower level the boiler will fire, regardless of the time period programmed, to prevent the pipes from freezing. Frost protection usually kicks in when temperature drops below 5 C in the UK. Please note: A standard room thermostat won t keep you protected against frost in areas outside the main temperature measurement area. If you have pipe work on exterior walls or in garages or outhouses, additional frost protection may be required. Find out about Honeywell s frost thermostats

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Gas Safe registered engineers Gas Safe is the official list of gas engineers who are registered to work safely and legally on boilers and all other gas appliances. A Gas Safe registered engineer has been checked to make sure they are competent and qualified to work with gas. Always ask to see your engineer s Gas Safe registered ID card. Ground source heat pumps These pumps use pipes which are buried in the garden to extract heat from the ground. This heat can then be used to provide hot water and heat radiators or underfloor heating. Guest bedroom If you have a guest bedroom that is only for occasional use, it makes sense to zone off this room and heat it separately. See Zoning

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Radiator Thermostatic Radiator Valve Heating Zone Valve Hot Water Zone Valve Stored Hot Water Cylinder Cylinder Thermostat Radiator 2I C Water Pump Boiler I2:30 Room Thermostat Programmer Heating Plan An S plan heating system includes one heating zone with a room thermostat and programmer or time switch, and two motorised zone valves to control the flow of water between either the radiators or the hot water cylinder. An S Plan Plus system includes an extra zone valve and room thermostat to control an additional heating zone. A Y Plan system does the same job as an S Plan but instead of two motorised valves, there is one mid-position zone valve that diverts water to where it is needed. Heating profiles A series of time and temperature instructions for your boiler, which can be heating or hot water profiles, or combined heating and hot water profiles, depending on the type of heating controls you have installed.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Hot water cylinder This copper or stainless steel tank, which is used to store hot water, can usually be found in the airing cupboard, loft or kitchen. They may also be remotely located in a garage or outhouse, and should be insulated to increase heat retention. Also known as a cylinder tank and hot water tank. Holiday button Lets you quickly and conveniently turn off your central heating while you re away without adjusting your regular programme. Then the day you arrive back your heating returns to normal operation so you come home to a comfortable climate. See Holiday button animation

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Installer Honeywell has a nationwide network of recognised installers with the right skills and knowledge to correctly install heating systems. They can also provide expert advice on all areas of heating and plumbing. Insulation Insulating water tanks, pipes and behind radiators reduces the amount of heat that escapes and can help you to reduce your energy usage and save money. Find an Installer

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Jumper If you re hanging around the house in your T-shirt and shorts in December, you ve probably got your heating set too high. Save energy and money by turning down the temperature and putting a jumper on with the money you save on your heating bills you can treat yourself to a new one. Junction box Honeywell s 10 way junction box is designed to simplify the wiring of central heating installations. It can be used in conjunction with the numbered wiring diagrams provided in the Honeywell Wiring Guide. This is a universal box and can be used with any 15 amp rated wiring application.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Knowledge of heating Although Honeywell heating controls are designed to be easy to use, it s important to seek expert advice if you are considering upgrading your central heating system. Find an Installer Key controls A well-controlled system will ensure that the hot water boiler or heater does not operate unless there is a demand. Selecting the right controls can substantially reduce overall running costs of a heating and hot water system. Find out more Who s in control of your energy?

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Line of Text (LoT) With Line of Text (LoT) technology, Honeywell digital controls provide information such as actual room temperature, time, date, and heating programme settings. Losing heat Even if your windows and doors are shut, your house may not be airtight and heat may be lost though small gaps and crevasses. Locate and fill these spaces to reduce energy wastage and bills.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Mechanical room thermostat This type of thermostat reads room temperature by measuring the rate a metal coil or a gas-filled diaphragm expands and contracts. Mechanical room thermostats are often hard wired into the heating system. Also known as an analogue room thermostat. Find out about Honeywell s wired thermostats Motorised zone valve These valves control the flow of water in heating systems and are commonly used to control separate pipe zones for heating and hot water. They are also used to divide heating systems up into multiple zones. Also known as zone valves. See Zoning

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z No-hassle heating controls Wireless heating controls are easy to install. There s no upheaval, no disruption to the fabric of the building, no lifting floors and no damage to décor. Watch the Introduction to Wireless Heating video

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z OK button This button can be found on a number of Honeywell controls. It is used to confirm that you are happy with the choices you have made when setting a timer or thermostat. Optimisation Optimisation is an energy efficient function that increases accuracy by starting the heating process as late as possible (Optimum Start) and switching it off as early as possible (Optimum Stop). Learn more about Honeywell heating optimisation Override button This button lets you switch heating or hot water on or off without altering the pre-set programme. You could use override, for instance, if you return home unexpectedly for the rest of the day and the heating s off. Simply press the button and the heating will come on until the next programme time. See Override button animation

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Party button Just press Party to extend your heating programme by a pre-set number of hours at a particular temperature before resuming with the normal temperature programme. This function is especially useful when you want to maintain or increase the temperature during special occasions, such as dinner parties. Look for the wine glass symbol on Honeywell s programmable thermostats. See Party button animation

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Programmable room thermostat This control lets you choose when you want the heating to be on, and what temperature it should reach while it is on. As well as measuring the ambient temperature of the surrounding area, a programmable room thermostat has a timing function that lets you set your heating for different times and on different days for greater control. These thermostats can be wired in or fitted wirelessly. Programmer The name for a central heating timer that controls the operating times of two separate parts of the heating system. These two channel timers are mostly used to provide independent timing of heating and hot water. They can also be used to control two different heating zones. See Honeywell s range of programmers See Honeywell s range of programmable room thermostats

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Quick start guides Once you ve had your Honeywell controls fitted these quick start guides, which are available with Honeywell products or can be downloaded, will help you to get started... quickly. In addition, Honeywell installer and user videos cover the installation, commissioning and use of the Honeywell Sundial RF² wireless heating system. See the current range of User Guides

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Radiator A heating device consisting of a metal case through which hot water is pumped by a central heating system. Radiator valve Mechanical radiator valves are used to manually control the flow of water to an individual radiator. They do not provide any temperature control. For this you need to install thermostatic radiator valves. RF signal RF stands for Radio Frequency and is a catch-all term for the transmissions from various wireless devices. Honeywell s products operate in a unique frequency band and all signals are clear and strong. There is little chance of interference from other signals. See Honeywell s range of room thermostats Room thermostat This is the control that measures the ambient temperature of your property and sends a signal to the central heating system telling it when to turn on or off. Room thermostats can be wired into the system or fitted wirelessly. See Honeywell s range of room thermostats

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Service period reminder Digital time controls can be set up to provide a reminder when the boiler is due to be serviced. Radiator Hot Water Cylinder Thermostatic Radiator Valve Heating Zone Valve Hot Water Zone Valve Cylinder Thermostat 21 C Water Pump 12:30 Room Thermostat Programmer 21ºC 20ºC Set point This is a temperature point that is set on a room thermostat. When the ambient temperature around the thermostat exceeds the set point, the boiler will stop firing. If temperature drops below the set point the boiler will fire. Stored hot water system Consists of a boiler, hot and cold water tanks, and radiators. The flow of water around the pipes is controlled by a zone valve. Boiler

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z TACMA TACMA This stands for The Association of Control Manufacturers, who are dedicated to advancing heating controls for domestic installations to ensure a comfortable environment at the least cost. Temperature controls This term covers a broad range of products that can control temperature in a heating system, including room thermostats and programmable room thermostats, thermostatic radiator valves and cylinder thermostats. Time control This control manages the time that the heating and/or hot water system is operational and makes sure that the boiler only fires for the time period that you set it to. There are three main types of time control: time switch, programmer and programmable room thermostat. On gravity hot water systems a time switch provides domestic hot water and room heating for the same period. Find out more about Time Controls

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Thermostat See room thermostat and/or programmable room thermostat. ON OFF 2am 4am 6am 8am 10am 12am 2pm 4pm 6pm 8pm 10pm 12am Thermostatic radiator valve These units fit on individual radiators and restrict the flow of hot water to the radiator if a specific set point measured by the valve is reached. See Honeywell s range of TRVs Time period A time period begins when your boiler switches on and ends when it switches off. Modern time controls allow you to set up to three on and off time periods per day, and some time controls let you set different time periods for all seven days of the week, so you can really tailor your heating and hot water times to suit your lifestyle.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Time switch A time switch (also known as timer) lets you control the time for either heating or hot water but not both. See Honeywell s range of time switches TPI Control Time Proportional and Integral (TPI) Control is a feature available in modern room thermostats that makes sure the boiler fires for the shortest possible time necessary to maintain your desired comfort levels. Mechanical controls do not have this in-built intelligence. See our TPI Control FAQ sheet

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z User guides Once you ve had your Honeywell controls fitted these guides, which are available with Honeywell products or can be downloaded, will help you to get started... quickly. See the current range of User Guides Underfloor heating There are two types of underfloor heating, electric systems or fluid flowing in pipes (hydronic systems), both of which can be installed as the main heating system in a property or as localised floor heating in, for example, the bathroom. Honeywell provides a range of products to control hydronic systems. Unvented cylinder This type of cylinder works directly from the mains supply of water and is essentially a hot water cylinder. See Honeywell s range of underfloor heating controls

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Vented cylinder This cylinder is connected via a vent pipe to the cold water storage tank, which is often located within the loft space.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Wired room thermostat This can be either a digital room thermostat or an analogue room thermostat and is powered by a fixed wire. When temperature falls below the set point, the thermostat turns the heating on by sending a signal to the boiler along a second fixed wire. See Honeywell s range of wired thermostats Wireless-enabled controls Designed to keep your home comfortable and your décor intact, easy-to-install wireless-enabled controls help to reduce household energy consumption and increase central heating efficiency. Watch the Introduction to Wireless Heating video See Honeywell s range of wireless heating solutions

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Wireless relay box This is the only wired component in a wireless-enabled heating controls system. It can be a separate relay box, or a built in component of the time switch or programmer that is wired into the boiler. Wireless room thermostat A wireless room thermostat talks to the central heating system control box wirelessly, so the control box does not need to be sited in the main living areas.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Wiring Centre The Honeywell Wiring Centre is designed to simplify the wiring of central heating installations. The Wiring Centre can be used with a wide variety of heating set-ups and has clearly labelled single terminal connections. They have a dedicated terminal block for each system component (with one wire per connection), an on board fuse (plus a spare), and cable clamps all situated in a strong fire-retardant box. Wiring Guide Smartphone App Your installer should always refer to Honeywell s wiring diagrams when fitting your heating controls. These documents can be accessed via the Honeywell Wiring Diagram App available for Apple and Android devices from itunes and the Google Play store. Over 30,000 downloads have been made. In addition, printable versions can be downloaded from the Honeywell website

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z X-height The ideal position on a wall for a room thermostat is 1.2m. At this height the thermostat is best placed to read the ambient temperature and can easily be reached by adults, but not young children.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z You and your controls It is important that you have the right controls to suit your lifestyle, increase efficiency and reduce costs. Honeywell s interactive Who s in control of your energy? tool will help you to identify the right controls for you and your family. Enter the Who s in control of your energy? interactive house

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Ground Floor First Floor Zone valve Zone valves control the flow of water in heating systems. These motorised valves are commonly used to control separate pipe zones for heating and hot water. They are also used to divide heating systems up into multiple zones to increase a household s energy efficiency via zoning. Zoning By creating different heating zones in your home, for example upstairs/downstairs, you can effectively heat rooms as and when you use them, reducing overall energy consumption and increasing comfort. Learn more about zoning Also known as motorised zone valves.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Index Ambient temperature Guest bedroom Override button Time period Analogue room thermostat Heating Plan Party button Time switch Automatic bypass valve Boiler Boiler interlock Call for heat Combi boiler based system Comfort level Cylinder tank Cylinder thermostat DECC Digital room thermostat ECO button Extra hour button Firing the boiler Frost protection Gas Safe registered engineers Ground source heat pumps Heating profiles Hot water cylinder Holiday button Installer Insulation Jumper Junction box Knowledge of heating Key controls Line of Text (LoT) Losing heat Mechanical room thermostat Motorised zone valve No-hassle heating controls OK button Optimisation Programmable room thermostat Programmer Quick start guides Radiator RF signal Radiator valve Room thermostat Service period reminder Set point Stored hot water system TACMA Temperature controls Time control Thermostat Thermostatic radiator valve TPI Control Underfloor heating User guides Unvented cylinder Valve Vented cylinder Wired room thermostat Wireless-enabled controls Wireless relay box Wireless room thermostat Wiring Centre Wiring Guide Smartphone App X-height You and your controls Zone valve Zoning

Energy Related Products (ErP) Ratings Product ErP Class evohome Multizoning system Class VIII 5% CM900/700 (Programmable Thermostats) Class V 3% DT92 (Wireless Digital Thermostat) Class IV 3% DT90 (Wired DIgital Thermostat) Class IV 2% Y87RF (Single Zone Thermostat) Class IV 2% Sundial RF2 Pack 1 Class IV 2% Sundial RF2 Pack 2 Class IV 2% Sundial RF2 Pack 3 Class V 3% Sundial RF2 Pack 5 Class V 3% T6360 (Wired Thermostat) Class I 1% Y6630D (Wireless Thermostat) Class IV 2% Voice Thermostat Class IV 2% X-height The ideal position on a wall for a room thermostat is 1.2m. At this height the thermostat is best placed to read the ambient temperature and can easily be reached by adults, but not young children. For more information about the benefits of Honeywell heating controls visit: www.fitathermostat.com 2013 Honeywell International Inc. All rights reserved. 114640 (0915) SB