Danfoss Randall
United Kingdom - News from Danfoss Randall

Danfoss offers local training in the latest heating controls

Sun, 29 Apr 2012 23:00:00 GMT

Danfoss offers local training in the latest heating controls

Danfoss is bringing professional training for installers of its domestic heating controls to regional venues around the UK. One day training seminars are being held at various locations during 2012 so installers can choose a course that’s convenient for them, from Paisley’s Premier Inn in Scotland to the Solihull branch of Plumbase in the West Midlands.

Training courses are run by an experienced Danfoss instructor and cover all aspects of domestic central heating controls techniques. Each training day includes a heating controls workshop, giving installers the chance to gain hands-on experience of wiring and fault finding under expert instruction.

Offering installer training courses in their area makes it easier for Danfoss customers to improve their skills and profitability, explains Marketing Director, Bjorn Sejr Nielsen. “Keeping up to date with the latest heating technology enhances your reputation as an installer,” he says, “and it opens up the opportunity for you to gain extra business by offering your customers control upgrades to optimise comfort and reduce heating costs.”

Danfoss regional training courses guide installers through the various heating systems and explain how these can be controlled more efficiently using Danfoss products, from programmers and thermostats to TRVs and motorised control valves. Instructors will also highlight the latest regulations relating to domestic heating installations, and recommend compliant solutions from the Danfoss range. The training day is completed by an afternoon workshop when installers can put their new-found knowledge to the test by wiring up a complete central heating control system and then check it for faults, continuity and correct operation.

Danfoss installer training courses include industry-approved training modules. They utilise the Institute of Plumbing CPD programme and the Institute of Domestic Heating and Environmental Engineers ‘Route to Membership’ programme. Installers receive a certificate from Danfoss on successful completion of the course.

For more information about Danfoss Installer Training, including dates and venues of courses being held around the UK in 2012, please click here.

Danfoss is a leading manufacturer of world-class heating controls, from programmers and thermostats to TRVs and motorised control valves, with factories in the UK and Denmark. The company’s extensive product range is supplied through a national network of stockists. As part of its commitment to improving the knowledge and profitability of its customers, Danfoss offers a programme of installer training courses and CPD seminars, covering all aspects of domestic central heating techniques.

Links
	Seminar Dates 2012

Danfoss Takes Control of Energy Savings with NEW living eco Radiator Thermostats

Wed, 25 Apr 2012 14:14:00 GMT

Danfoss Takes Control of Energy Savings with NEW living eco Radiator Thermostats

living eco^® is the latest programmable electronic radiator thermostat from Danfoss. With its clear digital display and simple push-button programming it offers a cost-effective way to control energy consumption in the home, without compromising comfort.

Pre-installed programmes make it easy for heating installers to set the thermostat to suit their customer’s needs. Choosing the P0 programme maintains a constant temperature 24 hours a day, while the P1 and P2 settings will lower the temperature at predefined periods of the day to save energy, and regulate the heating to match the user’s lifestyle when the home is occupied. Extra energy savings can be made with the innovative open-window function, which prevents heat being wasted by closing the valve if the thermostat detects a significant drop in room temperature. Danfoss has also included a handy holiday function so users can set living eco^® to reduce the temperature while they are away and turn back to the desired temperature in time for their return.

Danfoss’ Marketing Director, Bjorn Sejr Nielsen, says the new living eco^® with its precise, intelligent heating control brings benefits for installers and their customers. He comments: “By replacing their old radiator thermostats with living eco^® homeowners can save up to 15% on their heating bills, according to studies based on typical UK heating systems. This is a real benefit which installers can promote to their customers during a scheduled service visit or call-out, for example. And because living eco^® is compatible with Danfoss radiator valves and many other non-Danfoss valves, the changeover can be completed quickly and easily.”

The new living eco^® thermostatic radiator valve from Danfoss is a compact device which runs on two AA alkaline batteries with a two-year lifetime. It has been specially designed by Danfoss to be user-friendly, with only three buttons on the front, and is fitted with a child lock to prevent little fingers from altering the settings. The intuitive digital display makes living eco^® simple to operate; it is backlit for easy reading.

Links
	Product Information
	Installation and Setting Guide

Stop water hammer in seconds with bi-directional TRV

Tue, 20 Mar 2012 23:00:00 GMT

Stop water hammer in seconds with bi-directional TRV

Danfoss, the leading heating controls manufacturer, has developed an instant solution to the common problem of system noise or ‘water hammer’ caused by chattering thermostatic radiator valves (TRVs), with the industry’s first, and only, ‘flow selectable’ bi-directional TRV for domestic heating installations.

Traditional ‘cone and seat’ type valves need to be fitted on the flow rather than the return side of the radiator to prevent hammer when a partially open valve is forced to slam shut by water flowing the wrong way through the valve - resulting in a costly call back for the heating engineer. Danfoss’s ‘flow selectable’ bi-directional TRV can be installed horizontally or vertically, in flow or return. If any noise occurs after fitting it can be stopped by simply ‘revolving’ the patented flow direction selector on the valve head from the factory-set position to the alternative setting. This quick and easy adjustment changes the direction of water flow around the cone, ensuring hammer-free flow in the appropriate direction without a time-consuming drain down, use of special tools, or loss of profit or business reputation.

Danfoss’s TRV provides an innovative solution to the age-old problem of water hammer for domestic heating installers and their customers, says the company’s Marketing Director, Bjorn Sejr Nielsen. He explains: “Hammering is rather like trying to hold a bath plug fractionally open as bath water flows out - the flow slams the plug closed again and again. If water flows the wrong way through a partially open TRV it will slam shut in the same way. With this new solution simply fit the ‘flow selectable’ bi-directional TRV and listen; if it hammers ‘revolve’ the barrel to reverse the flow direction and the problem’s solved. Simple!”

Danfoss’s ‘flow selectable’ bi-directional TRV is a real-time saver, particularly in large domestic heating installations, where resolving problems with TRVs that had been installed the wrong way round could be a time-consuming task. Bjorn Nielsen says: “This TRV may carry a small premium but soon pays for itself in savings on call backs, contract delays and downtime.”

Featuring a new generation bi-directional valve body, this TRV is designed by Danfoss to deliver improved performance in whatever direction it is fitted. It utilises high performance liquid actuators and is CEN approved for maximum customer confidence and reliability in use. The ‘flow selectable’ bi-directional TRV is available from all leading stockists of Danfoss domestic heating controls and can be supplied in convenient TRV Combi Packs or in Radiator Packs, complete with matching lockshield valve.

Keep mobile with new Danfoss assist

Wed, 14 Mar 2012 23:00:00 GMT

Keep mobile with new Danfoss assist

Heating controls manufacturer, Danfoss, has launched a new technical support service on a mobile web site for domestic heating installers on site. Specially designed for viewing on a smartphone display screen, www.Assistyou.Danfoss.co.uk offers instant access to installation guides and much more for Danfoss’ thermostatic radiator valves, time controls, and electric thermostats. Wherever they are, heating professionals can log on to the Danfoss Assist mobile web site using their smartphone to find PDF installation guides, together with handy helpline numbers and links to the latest offers for Danfoss customers.

Danfoss’ Marketing Director, Bjorn Sejr Nielsen, says the Danfoss Assist mobile web site reflects the company’s ‘no-nonsense’ approach to installer service and support. He believes the company’s new mobile web site will be particularly useful for installers who need instant assistance, and especially smaller companies without the benefit of an in-house technical department. He comments: “We appreciate that it’s not always practical to consult a printed manual when you are out on a job, especially if the client is watching! Quick and easy to navigate, Danfoss Assist uses simple icons to take you straight to the information you need in a couple of clicks.”

As well as online installation guides for its most popular domestic heating controls, Danfoss also plans to include a section for installation tips movies to assist on-site installation. This section will be developed as more movies are produced. Additionally, users will be able to find details of how to request a replacement product under Danfoss’ ‘No Quibble Warranty’, or check out the company’s installer training programmes. As a further benefit, Danfoss Assist will be updated on a regular basis to show special promotions which installers can apply for via the mobile.

Danfoss is a leading manufacturer of world-class heating controls, from programmers and thermostats to TRVs and motorised control valves, with factories in the UK and Denmark. The company’s extensive product range is supplied through a national network of stockists. As part of its commitment to improving the knowledge and profitability of its customers, Danfoss offers a programme of installer training courses and CPD seminars, covering all aspects of domestic central heating techniques.

Danfoss Randall strengthens 'no quibble' warranty for controls

Tue, 03 Jan 2012 11:07:00 GMT

Danfoss Randall strengthens 'no quibble' warranty for controls

Danfoss Randall is reinforcing its industry-beating ‘no quibble’ two-year warranty on its domestic heating product range, from programmers and thermostats to TRVs and motorised control valves. Whatever the nature of the fault or defect, manufacturing or installation, installers can return ‘in warranty’ products to their local merchant and receive an equivalent product from the Danfoss Randall range – completely free of charge, no quibble!

The installer doesn’t have to wait for a faulty product to be tested or for a new product to be despatched; he can simply swap old for new at the merchant counter. Of course, when a faulty product is then returned by the merchant Danfoss will test it to original manufacturing specification, and even if a problem cannot be found the offer of a free replacement still stands. “That’s what we mean by no quibble,” says the company’s Marketing Director, Bjorn Sejr Nielsen. “And if you can’t find the original receipt, simply contact our customer service department and request a Return Materials Authorisation (RMA). Warranty expiry details are clearly marked on all products, making it simple to see if it’s still under guarantee,” he adds.

Danfoss Randall believes this unique product warranty reflects the company’s ‘no nonsense’ approach to customer support. From technical helplines and online installation guides to training that keeps installers up to date with the latest technologies, Danfoss Randall is dedicated to making life easier for its customers. “Now, if any of our products fail to meet our high quality standards, for any reason, we’ve made it really quick and easy to get a free replacement at no cost to your business,” says Bjorn Sejr Nielsen. “The benefit to Danfoss is two-fold: happier customers who can trust the brand, and, of course, the opportunity to identify any possible product defect which can be engineered out by better manufacturing.”

Danfoss has been a leader in radiator thermostats since the 1940s, and Randall became a leader in central heating controls in the early 1960s. Formed in 1991, Danfoss Randall is a leading manufacturer of world-class heating controls, from programmers and thermostats to TRVs and motorised control valves, with factories in the UK and Denmark. The company’s extensive product range is supplied through a national network of stockists. As part of its commitment to improving the knowledge and profitability of its customers, Danfoss Randall offers a programme of installer training courses and CPD seminars, covering all aspects of domestic central heating techniques.

Frequently asked questions about installing heating controls

Wed, 30 Nov 2011 23:00:00 GMT

Frequently asked questions about installing heating controls

Our technical team offers answers to some of the most frequently asked questions about choosing and installing domestic heating controls.

What do you need to consider to ensure that new heating controls will be compatible with a new or existing boiler?
This is a common enquiry and the main consideration is the type of boiler. In many three-port zone valve and two-port zone valve systems, for example, the motorised valve actually fires the boiler and the room thermostat switches the valve, so a standard mains voltage room thermostat should be used. With a combination boiler the room thermostats are normally wired directly which means that you need to find out the boiler’s switching voltage in order to select a compatible control; the boiler’s installation manual should tell you whether it is a mains voltage unit, often referred to as low voltage, or an extra low voltage model. Low voltage refers to any voltage between 50V and 1000V but is most commonly 230V (-6% +10%). Extra low voltage is under 50V and can be as low as 12V. You may find that some combination boiler manuals do not state what the voltages are across the thermostat contacts and will just state that the thermostat must have volt-free, or dry, contacts. This means they have no voltage on the contacts and, generally speaking, will switch any voltage across their contacts.

To sum up, if the boiler is mains voltage switching then a mains powered room thermostat should be used. If you are not sure, then a volt-free switching room thermostat is probably the best option as many of these are suitable for use with either 230V or below 50V boilers.

How do you decide whether to install wireless or hard wired heating controls?
Wireless room thermostats provide a particularly quick and convenient solution when upgrading an old heating system where room thermostats may not have been fitted when the system was originally installed, or the thermostat is no longer in a practical position. Installing wireless rather than hard wired controls is ideal for this type of job as it doesn’t disturb existing décor. However, wireless controls are not exclusively for retrofit installations. Although room thermostats in new build homes are mostly hard wired, wireless controls can still be an attractive solution for new heating systems. With no hard wiring involved, most qualified plumbers can complete an installation without the assistance of an electrician – saving time and cost on a job.

Is it possible for wireless thermostats to be affected by other wireless products in the home?
This is a question that installers are often asked when they suggest wireless controls to a customer, and the answer is no. There is no chance of interference from a home computer’s Wi-Fi system, for example, because wireless heating controls use unique identity coded radio signals which ensure secure communications.

How do you calculate the number of thermostats required?
Since it was introduced last October, Part L 2010 has required domestic heating installers to include at least two temperature-controlled heating zones and one hot water zone in all new systems in dwellings that are not open plan. Each zone must have at least one room thermostat and individual radiator control, such as TRVs. Of course, room sizes should also be considered when assessing the number of thermostats required. According to the Part L 2010 Guide produced by TACMA (The Association of Controls Manufacturers) rooms up to 150 sq m can have a common time control; any zones above this size should be timed independently. Installers should also be aware that when replacing a boiler in an existing system it is now considered good practice to install TRVs in all rooms with radiators except those with a reference room thermostat.

Having worked out the number of thermostats needed on a job, are there any guidelines about where these should be located?
Traditionally, thermostats were positioned at 1,500mm above floor level for optimum efficiency in terms of room temperature, and to be at a convenient reading level for most adults (but beyond the reach of a child’s inquisitive fingers!). With the introduction of Part M this has been reduced to 1,200mm to enable easier access for wheelchair users, without being too low, where the air will be cooler. Apart from mounting at the regulatory height, a thermostat should be installed in an area with good air circulation and where it will not be affected by draughts, dead spots behind doors, radiant heat from the sun, hot or cold air from ducts etc. Also, it is not recommended to have an outside wall behind the thermostat, and areas with concealed pipework are best avoided.

Part L made easy with new guide to heating controls from Danfoss Randall

Tue, 11 Oct 2011 13:53:00 GMT

Part L made easy with new guide to heating controls from Danfoss Randall

Domestic heating installers can find out all they need to know about Part L 2010 with a helpful new guide to compliance from heating controls manufacturer, Danfoss Randall. The free 28-page booklet explains how changes to the previous Part L documents affect domestic installers, particularly in terms of enhanced zone control, and sets out solutions for different types of domestic heating systems using Danfoss Randall’s range of Part L Control Packs.

Presenting Part L 2010 - and how to comply - in a user-friendly format is the main purpose behind the new Guide to Part L, explains Danfoss Randall’s Marketing Director, Bjorn Sejr Nielsen. “We know that getting to grips with new regulations can be daunting, especially for smaller companies who may not have the benefit of an in-house technical department. Part L 2010 has been no exception,” he says. Using example system layouts and simple diagrams showing time control requirements for combi, standard, and unvented systems, the company’s free publication aims to demystify the regulations for domestic heating installers. Bjorn Sejr Nielsen continues: “It guides installers through the process of setting up time control zones for new and replacement heating systems, and selecting the right Part L Control Pack from our range to ensure compliance.”

Since it was introduced last October, Part L 2010 has required domestic heating installers to include at least two temperature controlled heating zones and one hot water zone in all new systems that are not open plan. Each zone must have at least one room thermostat and individual radiator control, such as Thermostatic Radiator Valves (TRVs). Also, when replacing a boiler in an existing system it is now considered good practice to install TRVs in all rooms with radiators (except those with a reference room thermostat).

Summing up, Bjorn Sejr Nielsen says: “All the Danfoss Randall Control Packs featured in our new Guide will ensure that domestic heating installers meet the requirements of Part L 2010 legislation. From a standard vented or unvented hot water cylinder installation to a wireless combi boiler system, we’ve got it covered, which makes life a lot easier for our customers.”

To obtain a free copy of Danfoss Randall’s new Part L Control Pack Catalogue call 0845 1217 400.

Danfoss has been a leader in radiator thermostats since the 1940s, and Randall became a leader in central heating controls in the early 1960s. Formed in 1991, Danfoss Randall is a leading manufacturer of world-class heating controls, from programmers and thermostats to TRVs and motorised control valves, with factories in the UK and Denmark. The company’s extensive product range is supplied through a national network of stockists. As part of its commitment to improving the knowledge and profitability of its customers, Danfoss Randall offers a programme of installer training courses and CPD seminars, covering all aspects of domestic central heating techniques.

Links
	Part L Catalogue

New High-Output Underfloor Heating Mat

Tue, 16 Mar 2010 11:42:00 GMT

New High-Output Underfloor Heating Mat

DEVI has introduced a new high-output underfloor heating mat especially suited to new or refurbishment applications such as poorly insulated conservatories and cellars that tend to lose heat more rapidly than other parts of the home. It is also ideal for other small areas that would benefit from the introduction of floor heating.

The Devimat DTIF-200 has an output of 200 W/m², allowing for faster heat-up and durable comfort.

DEVI, part of the global Danfoss Group, has been manufacturing electric floor heating units for more than 60 years and is currently Europe's leading industrial player. The new mat, designed for installation on concrete or tiled floors, completes the DTIF range and complements its existing 100Wm² and 150Wm²mats.

Devimats are prefabricated to allow easy installation. They comprise a self-adhesive open mesh onto which is attached a thin heating cable. The mat is laid in position and is then covered by a flexible tile adhesive that is used to fix the tiles to the floor. The total thickness of the mat and cable is just 3.5mm. Mats are available in a range of sizes from 1 – 12m², each mat being approximately 0.5m wide.

The DTIF-200 mat utilises a twin-core heating cable with solid aluminium sleeving for added safety. Termination of the mat to the thermostat is achieved using a single 2-core cable moulded onto the met during manufacture. Appropriate thermostats are available from the DEVI range. The DTIF-range is certified in accordance with current standards and the heating cable mats are covered by DEVI’s general 10-year guarantee.

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	More information...

New Manifold System Introducecs Cutting-Edge Features

Tue, 16 Mar 2010 10:29:00 GMT

New Manifold System Introducecs Cutting-Edge Features

Danfoss’ new FHF-F manifold system incorporates additional features that introduce a far higher level of functionality than most previous solutions.

The Danfoss FHF-F is used for controlling water flow in underfloor heating systems. Each pipe in the floor heated system is connected to the manifold, making it possible to individually control water flow or heat supply to each room in the building.

The FHF-F, in common with its now obsolete CDF predecessor, employs established and well-proven Danfoss valve inserts to regulate the flow to each circuit, thus assuring continued high performance and dependability. After this, the specification broadens to include a number of innovations.

Each FHF-F unit, size 1”, comprises a supply and a return manifold with connections for a minimum of 2 or up to as many as 12 heating circuits. The supply manifold allows for any of the circuits to be completely shut off and includes an individual flow meter (sight-glass type) for each. This makes it easy to balance the total underfloor system by providing an instantly visible reading of the water flow in each circuit at any given time.

The return manifold is equipped with Danfoss integrated valves with a simple, effective pre-setting facility, allowing optimal hydraulic balancing and easy commissioning of the underfloor system. Pre-setting can be carried out quickly without the need for any tools. Once the thermal actuator is mounted, presetting is automatically protected and can only be altered by removing the actuator.

Each heating circuit is controlled by Danfoss TWA thermal actuators. These are available in Normally Closed (NC) or Normally Open (NO) modes and as either 24V or 230V units.

Connections between the manifold and the underfloor heating pipework are made readily by using standard Danfoss ¾” internal threaded compression fittings for PEX, AluPEX or copper pipes.

Ball valves are available as an option for providing positive shut-off between the manifold and the system. Manifold end pieces are supplied with manual air vents; automatic air vents are available as an option.

A full range of accessories for the FHF-F is available including mounting brackets, end sections with drain taps, automatic air vents, ball valves, thermometers and reduction pieces. All FHF-F products plus supplies of sales literature are available with immediate effect.

Technical parameters for the FHF-F are:

Maximum differential pressure: 0.6 bar

Maximum working pressure: Manifold with flow meter – 6 bar

Maximum test pressure: Manifold with flow meter – 10 bar

Maximum flow temperature: 90°C

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	More information...

Danfoss Launch CPD Seminars

Thu, 07 Jan 2010 10:23:00 GMT

Danfoss Launch CPD Seminars

Danfoss has launched a new CPD seminar - The Complete Balancing Solution.

With the now almost universal use of variable flow heating and cooling systems, Danfoss Randall has sought to bring together all aspects of system balance and control into one CPD seminar. Aimed at mechanical design engineers, the two 40 minute workshops titled 'The Complete Design Solution for Variable Flow Systems' will give design engineers a complete understanding of variable flow balance throughout a project's design, installation, commissioning and lifetime. For further information or to arrange a CPD seminar at your premises click on the link below.

Links
	Further information...

Advanced and Easy Wireless Floor-Heating Controls

Tue, 20 Oct 2009 11:24:00 GMT

Advanced and Easy Wireless Floor-Heating Controls

Danfoss has launched its new and exciting, energy-efficient CF2 Wireless Floor Heating Control System that provides individual room or floor temperature control with the option of wireless remote control.

Based on advanced Z-Wave 2-way wireless technology, this versatile CF2 system offers optimum reliability and extended functionality, combined with unrivalled ease of installation and use. With its automatic self-diagnosis system, it has been developed to ensure quick and easy installation, commissioning and servicing - thus saving installers time and reducing their costs.

Designed for use with hydronic floor heating systems, the CF2 system provides a range of features for optimal comfort with individual room or floor temperature control, plus the option of wireless remote control. Depending on requirements, a CF2 system consists of up to three Master Controllers with appropriate wireless room thermostats from a choice of four, i.e. Standard, Public (tamperproof), Display and Display with Infrared Floor Sensor.

As required, an optional easy-to-use Remote Controller makes all CF2 system options, functions and application features accessible through its large display and centrally placed push buttons. A large system with up to 3 Master Controllers can be accessed using one Remote Controller.

Also, a Repeater Unit extends the transmission range between the Master Controller, room thermostat and other connected components by 2-way wireless communication. This is particularly useful where distance or physical objects may impede RF signals.

CF2 installation simply requires the Master Controller to be mounted on to a wall and connected to a 230V power outlet before quickly connecting the actuator cables. Each Master Controller features 5 or 10 outlets that accommodate a wide range of actuator cables. After the wireless assignment of the room thermostats to the Master Controller, the system is ready for use and to be handed over.

The system’s 2-way wireless communication ensures a high level of transmission reliability and, by means of the link test function, all wireless connections to room thermostats can be verified before the thermostats are physically installed. A remote antenna is available for situations where the Master Controller is shielded (e.g. in a metal cabinet) from other system components.

The Danfoss CF2 Wireless Floor Heating Control System is so versatile, easy to install and simple use that it is sure to become the first choice of many installers.

Links
	CF2 Room Thermostats
	CF-MC Master Controller
	CF-RC Remote Controller
	CF-RU Repeater Unit

The Whole Controls System Must Be Right

Sun, 04 Oct 2009 23:00:00 GMT

The Whole Controls System Must Be Right

There are more than 20 million dwellings in the UK and tens of thousands of extra new homes are to be built over the next two or three years and all of them will require heating systems with heating controls. It is, very largely, up to the installing trade to ensure these controls produce the savings of which they are capable.

In July 2009, Gordon Brown pledged £1.5 billion for affordable housing. He said this strategy would increase the number of affordable homes built before 2011 by 20,000, to 110,000. Apparently, funds available for council house building will triple to £350 million; a further £500 million will be allocated to the kick-start fund for stalled private sector developments and £750 million to the national affordable housing programme.

Advanced controls

For some time, the UK trade media has exhorted domestic heating installers to fit advanced controls whenever possible. This is sound advice because, in most cases, these latest devices can provide energy savings beyond the scope of conventional controls.

Danfoss, the major controls manufacturer, has always remained at the forefront of innovation. It has developed and produced its comprehensive range of cutting-edge electronic time controls, pioneered the use of programmable room thermostats in the UK, developed fast-response electronic thermostats and introduced energy-saving chrono-proportional control.

But all this does not mean that we should turn our backs on those other essential controls that have served us so well and even now make it possible to achieve today’s higher levels of savings.

Support controls

Danfoss engineers also understand that advanced controls need to be installed in well-designed systems to attain optimum results and that success depends upon support products such as motorised valves, cylinder thermostats, room thermostats and automatic by-pass valves. Also, as the inventors of the TRV - the oldest room temperature control of them all - they do not need to be told about the huge contribution this has made to energy-saving.

Accuracy, reliability and ease-of-use are the prime requirements for these ‘support’ controls and it is in these areas that Danfoss has continually developed its conventional products year-by-year. Decades of global experience in central heating application coupled with the finest R & D resources means the company is exceptionally well-placed to create ground-breaking product designs.

Bi-directional TRVs

As just one example, Danfoss development engineers recognised that widely varying hydraulic dynamics in ‘wet’ central heating systems made it physically impossible to produce one single bi-directional TRV design that could totally prevent system noise in every case. The solution was the patented ‘Revolver’ mechanism – now standard in all Danfoss domestic TRVs - that quickly and easily enables ‘water-hammer’ to be overcome, whenever it occurs, without draining down and re-plumbing.

Motorised valves

Also, Danfoss motorised valves – both paddle and shoe types – have been extensively developed. Operating on proven principles, they were massively re-engineered to give them additional strength and reliability. Danfoss introduced features such as higher-than-usual test pressures, support bearings at both top and bottom of the shoe and paddle spindles and tough polycarbonate actuator covers – all without any price premium for the added quality, robustness and performance.

Thermostatic control

Again, Danfoss in-depth research confirmed that one conventional product in particular – the electro-mechanical room thermostat - requires careful consideration before its continued use in a system after the boiler has been replaced with a new condensing type. In such situations, it is often necessary to fit a faster-acting electronic thermostat that allows the boiler to operate in condensing mode for the majority of its time. Obviously, unless the boiler is operating in condensing mode, it is saving little more than the one it replaced.

Making correct choices

The choice of controls, therefore, is vital to the efficiency of any central heating system. Advanced devices are designed to provide extra savings made possible by latest technologies, but these very devices themselves rely for their success upon quality conventional products. Making correct controls selections is a complex decision that, for most installers, needs assistance from heating control specialists such as Danfoss.

Building Regulations require that, each time an ageing boiler is replaced, the controls are updated where necessary. Danfoss can provide both the advice and the controls to allow this requirement to be met. Visit website www.danfoss-randall.co.uk for information and literature.

The Need for Advanced Heating Controls

Wed, 29 Jul 2009 23:00:00 GMT

The Need for Advanced Heating Controls

In the UK, upgrades on the smaller domestic-type heating systems used in shops, schools, offices and dwellings are urgently needed. Heating controls are playing an increasingly important role as the drive towards the government-projected low carbon economy gathers pace. Electrical contractors would be well advised to prepare for increased involvement in this sector, which might be a new area for many.

As the future unfolds, no matter what heating source is used, it is the way in which the energy is controlled that will make the difference; and it will be necessary to adopt improved controls concepts if we are to make the required energy savings.

Around 27 million dwellings plus thousands of small commercial premises (shops, offices, etc.) are equipped with domestic-type heating systems. Many of these are using traditional heating controls that are no longer achieving the energy-efficiency levels needed. More flexible control technologies based on electronics are required to enable, previously neglected areas of energy wastage to be eliminated.

Such advanced technologies, of course, are already being used in larger commercial and industrial complexes where small percentage savings represent substantial cash sums. Now is the time to upgrade the smaller installations.

UK dwellings alone generate over 25% of total national greenhouse gas emissions. Add to this the emissions from small commercial premises and a very worthwhile reduction target emerges. This could create huge opportunities for electrical contractors who choose to refurbish these smaller heating systems across the UK.

Installation of advanced controls seems ideally suited to the skills of electrical contractors and this work certainly does not need to be abdicated to plumber/heating engineers.

Background

Today’s high prices for heating fuels, coupled with the pressures being applied for environmental conservation, have stepped up awareness of the need to consume fuel only when and as necessary. Past revisions to the Building Regulations Part L (Conservation of Fuel and Power) have imposed improved levels of heating control in new-build properties and in those undergoing major refurbishment. The latest change directs that only high-efficiency condensing boilers may be installed, and this has had far reaching effects.

Whenever one of these more expensive replacement boilers is installed, the heating system’s controls also need to be updated, as appropriate, to latest Building Regulation standards.

However, although many of these existing controls meet the basic letter of the law, in operation, not all of them are able to respond sufficiently quickly to temperature changes to maintain the boilers in their condensing modes. Thus, the high efficiency rating of the new boiler is often not achieved, making it little more energy-efficient than a non-condensing type.

Tests

Condensing boilers can be massively more efficient than conventional types, but only if they are supported by the other heating system components. A year or two after their introduction, there arose a generally held assumption that, by doing nothing more than installing high-efficiency condensing boilers, reductions of 10% - 14% in central heating energy consumption and carbon emissions would be achieved automatically.

For this to be true, it meant that, when replacing boilers, existing room temperature controls had no influence whatsoever on boiler efficiency.

Controls manufacturers felt that the choice of room temperature controls does have an important bearing on system efficiency. Members of The Association of Control Manufactures (TACMA) decided to carry out investigative tests.

In a purpose-built, environmentally-controlled test house, carefully measured trials were conducted on three types of room thermostats in a gas-fired central heating system using a Class A condensing boiler.

Controls tested were:

■ A standard mechanical room thermostat

■ An electronic on/off room thermostat incorporating a microprocessor operating a PI control algorithm.

■ A similar electronic thermostat operating in chrono-proportional mode. This method of control divides each hour into sections (usually 3 or 6) and calculates the percentage of these periods for which the boiler should operate to maintain desired comfort.

High-efficiency condensing boilers

To achieve their high efficiencies, condensing boilers need to extract and use heat from the combustion gases that are discharged through their flues. Removing this heat (typically dropping the flue gas temperature from140°C to 50°C) causes moisture to be precipitated in the form of a slightly acidic condensate.

Unless these boilers operate in this condensing mode they will not achieve extra savings or attain optimum efficiency ratings.

Most current published advice on controls merely states that the basic set of controls needed with a condensing boiler comprises an electronic time control allowing independent switching of heating and hot water, a room thermostat, thermostatic radiator valves (TRVs) and separate temperature control of hot water

Some advice also mentions programmable room thermostats, weather compensators, boiler energy managers and zone controls.

Test profile

The in-house tests simulated a ‘Winter Weekend’ profile where the external temperature was maintained at 10°C, the test room was allowed to cool to 15°C before commencing the run and the room temperature control was set at 20°C. The run was a single 12-hour operation, turning the system on once and controlling at a fixed temperature. The total system load was 13kW at start-up.

This set-up allowed the effect of temperature control alone to be accurately monitored with all other factors remaining constant.

Impact on boiler efficiency

Test results confirmed that the relatively slow temperature-triggered on/off cycling of conventional mechanical room thermostats did little to assist the boiler attain condensing mode.

By measuring the temperature of the water returned to the boiler it was found that, controlled by the mechanical thermostat, the boiler hardly ever operated in full condensing mode during its ‘On’ cycle. This was due to the control’s relatively slow response and indicated that too much heat was lost from the water in the system during the ‘off’ period to maintain the condensing temperature.

Using the on/off electronic room thermostat produced slightly better control and room comfort. Control again relied on a temperature-triggered on/off cycle. Gas consumed was just over 3% lower but there was a small increase in electricity consumption due to the more frequent pump operation and the fact that pumps have peak electrical demand when they are switched on.

When a similar electronic thermostat was used in chrono-proportional mode, results showed reductions of over 10% compared to the mechanical thermostat in both energy consumption and carbon emissions. This can be explained by the faster chrono-proportional control reaction with its time-calculated modulating action that kept the boiler almost permanently in condensing mode

Summary

The tests indicated that, if a property has only a simple mechanical thermostat installed, then the energy-saving benefits of a replacement high-efficiency condensing boiler will not be realised as the boiler will rarely be running in condensing mode. Switching to an on/off electronic room thermostat produces reductions of over 2% in both energy cost and carbon emissions.

Use of an electronic thermostat with chrono-proportional capability provides closer temperature control plus possible reductions of 10% in both fuel cost and carbon emissions.

The reductions identified in the tests are tabulated below.

Control	Energy Cost (£)	Energy Saving (%)	Carbon Emissions (kg CO2)	Carbon Saving (%)
Mechanical On/Off	2.39	-	13.56	-
Electronic On/Off	2.34	2.10	13.25	2.31
Chrono-Proportional	2.14	10.35	12.11	10.71

Tests carried out with other manufacturers’ on/off controls produced similar figures.

Test conclusions

Changing just the boiler from a non-condensing to condensing type in a domestic-type central heating system does not necessarily optimise potential energy and carbon emission savings. An electronic room temperature control, preferably with chrono-proportional capability, is often needed to justify the cost of replacing the boiler.

Upgrading not difficult

Chrono-proportional room thermostats are readily available and are just as easy to install as traditional electro-mechanical units. To make the job extra easy and quick, RF (wireless signalling) thermostats overcome any question of having to run fixed wiring and eliminate the need for any making good.

Probably the best upgrade currently would be to replace the existing room thermostat and programmer system with one chrono-proportional programmable room thermostat. This enables a number (say up to six) of room temperature levels to be automatically programmed each day, allowing space heating to be ‘tailored’ to occupants’ needs. In this way, only necessary heating fuel is consumed.

Looking forward

These advances provide just a taste of what will be happening until the government’s low-carbon economy becomes a reality. Who knows what further exciting energy-saving products, fuels and heating technologies will be forthcoming. It is, however, very clear that heating controls are essentials for now and the future and could be an important part of every electrical contractor’s work.

It seems likely that, rather than having stand-alone control systems for all the energy-consuming functions under one roof, a more integrated set-up will become the norm in order to optimise total energy usage.

The arrival of one-way proprietary wireless controls some years ago has thrown up enormous possibilities for the future; not just in saving energy and reducing harmful emissions, but for overall convenience and comfort. Rather than being stand-alone propriety products, heating controls are instead probably going to have to be able to communicate with many other systems controlling other functions such as lighting, security, electrical appliances, home entertainment equipment, access control, garden sprinklers, etc.

Most people currently have only standard heating controls in their home network but, as the wireless home controls market expands, electrical switching solutions, security systems and even utility metering operating are likely to be included. As a consequence, many heating controls manufacturers are beginning to produce two-way wireless controls.

A well known widely used 2-way wireless technology is the Z-wave, already incorporated and available in room thermostats, programmers and cylinder thermostat. Further compatible heating controls are constantly being developed.

Z-Wave is a wireless communication protocol that allows products using it to understand what each is saying, even if they have no actual interaction. Over 125 companies have formed the Z-Wave Alliance, all of these active in developing products like domestic electrical wall sockets, light switches and luminaries, garage door openers, security products and heating controls.

As an open protocol, Z-Wave offers huge benefits for home automation and integration. Z-wave based control systems can be expanded as and when needed without the need for a large up-front investment in a total home control system and without the need to stay with one supplier of various controls. Users can buy Z-Wave security, garage door opening, heating and lighting systems from different suppliers and they will all work happily together.

Existing one-way proprietary wireless communication technology normally employs 433MHz transmission frequency. These systems are relatively difficult to expand at a later stage and some installation rules have to be strictly followed in order for the system to work satisfactory.

A two-way Z-Wave based communication overcomes many of the installation restrictions experienced with a one-way based communication by enabling signals to pass from one product (regardless of its function in the system) to another in a network automatically creating the optimum route for the wireless signals. This technology offers truly exciting possibilities – improved home comforts, convenience, easy installation and operation plus energy and fuel cost savings – for householders.

Are you prepared?

Changes in the way we all handle our consumption of energy are already happening. The government is committed to a massive 80% reduction in greenhouse gas emissions by the year 2050. There can be little doubt of its determination to achieve this target.

Every possible tax, law, restriction, incentive and measure is likely to be utilised to bring about the required huge change in public attitude to reducing energy consumption and fuel wastage. All relevant new technologies are sure to be incorporated into our changing society.

Advanced heating controls will be required as a part of ensuring that essential energy consumption is properly used. All installers working in this sector will need to become increasingly knowledgeable about controls technology.

Are you prepared? If not, are you prepared to do something about it? If you are, a very remunerative area of work could be open to you simply by supplementing your present skills with improved controls knowledge.

Heating controls information is freely available by visiting the TACMA website www.heatingcontrols,org.uk or by making contact direct with TACMA member companies.

TRV's Are Essential

Tue, 30 Jun 2009 23:00:00 GMT

TRV's Are Essential

Thermostatic Radiator Valves (TRVs), the original and simplest room temperature controls, remain essential for optimum efficiency in most ‘wet’ domestic central heating systems. They help create optimum comfort while significantly reducing heating costs and greenhouse gas emissions.

Function

TRVs, fitted to individual radiators, are accurate set-and-forget room temperature controls that generally help minimise heat generation and enhance comfort levels. They also make additional savings by independently maintaining lower temperatures in unoccupied and other appropriate rooms.

Requiring no external power to operate, TRVs sense room temperature changes – including extraneous ‘free’ heat from sunlight, appliances, body heat, etc. – and adjust the flow of heated water through the radiators accordingly. Conventional room thermostats alone provide just single-zone temperature control based on one sensing point and one temperature setting.

Construction

A TRV comprises two basic sub-assemblies – a valve body and a sensor - that are easily fixed together.

Valve bodies regulate the flow of heated water through radiators. They are available in straight, vertical angle and horizontal angle configurations to suit various applications. There are also special valves, e.g. presetting types and high flow versions for single pipe systems.

Sensors monitor room temperatures and adjust valve operation. They incorporate wax, liquid or gas charged capsule-and-bellows assemblies within the sensor head. Wax has the slowest response to temperature change with liquid being currently the most usual option. Gas-charged sensors have the quickest response to temperature changes and hence provide the optimum comfort control and energy saving.

In use, these easily settable units expand and contract with room temperature changes, operating a piston that acts on the valve pressure pin (spindle). As room temperature increases, the valve throttles back the flow. A spring returns the piston promptly when contraction (cooling) occurs.

The TRV’s control action is modulating, i.e. it makes appropriate slight adjustments to the valve spindle position to increase or reduce the volume of heated water passing through the individual radiators. The desired control temperature is easily set by rotating the setting dial (sensor head) until the appropriate icon or number coincides with the setting mark. Setting ranges vary with different manufacturers and types.

Types

Today’s most popular TRVs for fully-pumped (2-pipe) domestic systems are 15mm bi-directional, reversible, angle types with built-in (integral) sensors. These allow total installation flexibility, i.e. sensor mounted vertically or horizontally in either flow or return.

Many alternative versions are produced to suit other systems and situations where this type is not appropriate.

Valve Bodies. Valve bodies for domestic systems exist in sizes from 3/8” to 1” BSP (Imperial) or 8, 10 and 15 mm (metric) for use in 2-pipe systems.

TRV valve bodies can be either threaded or provided with compression fittings. Also available are push-fit fittings for plastic pipe. Special high capacity bodies are available for 1-pipe systems.

Others, such as presetting valves, are also obtainable. These help installers to hydraulically balance heating systems to give even distribution of heat, better comfort and lower energy consumption.

Standard bi-directional valve bodies are claimed to allow flow in both directions, thus removing the possibility of system noise. However, intensive research found it physically impossible to produce a completely universal bi-directional valve that would eliminate noise under every set of conditions. Consequently, a flow selection mechanism was introduced that enabled flow direction to be completely reversed simply by rotating a metal collar through 180°. Thus, any noise problems encountered could be easily and quickly overcome without draining down and reinstalling.

Sensors. Built-in (integral) sensors may be secured to valve bodies by Allen screws, screw collars or snap-lock mechanisms.

For installations where integral sensors are not practical, remote adjusters are readily available. These sealed units connect to the valve-operating unit by a length of thin capillary tubing.

Also, there are advanced battery driven electronic programmable sensors that enable temperature setting changes to occur at pre-set times.

Installation

Installation involves a straight-forward plumbing job for the valve body plus ensuring the sensor head is fixed correctly. No wiring is necessary. However, care is required with valve siting and sensor mounting.

To monitor air temperatures representative of the room as a whole, the best installation position is in the radiator flow with the sensor mounted horizontally away from the hot valve body and pipes. Mounting the sensor vertically above the hot valve can prevent the room attaining the desired temperature as and when the flow temperature fluctuates.

If sensors must be mounted vertically, due to space limitations or for other reasons, they are best fitted at the return where temperatures are lower.

Also, sensors positioned behind curtains or furnishings, or in tight corners alongside hot pipes, will not allow satisfactory control and remote sensors should be used.

In all domestic heating systems, including those controlled predominantly by TRVs, an overriding room thermostat should be provided to meet the Building Regulations requirement for boiler interlock circuitry that prevents wasteful boiler ‘dry’ cycling.

Explain use

It is important that installers explain to end users how to operate TRVs so that all optimum savings are made, e.g. turning down the setting when ventilating a room or when rooms are not being used for a longer period of time. It is although important to get the message across to the user that a TRV is overall a set-and-forget control and there is no need to operate the TRV as a manual valve. The opening and closing will be handled by the sensor according to the set temperature.

Commercial TRVs

Also available are excellent ranges of radiator thermostats designed to withstand the accidental and deliberate abuse frequently encountered in commercial and public premises. They high quality units are designed to give extra strength to resist heavy loading (e.g. children standing on them) and with more robust fixings.

Devimat Cost Effective Invisible Heating

Thu, 25 Jun 2009 23:00:00 GMT

Devimat Cost Effective Invisible Heating

The DeviMat electric cable mat system is one of today’s easiest and most cost-effective methods of floor warming. Completely unseen in the home, DeviMat is easy and quick to install, totally safe (CE compliant), and easily controllable.

Whether you are renovating a kitchen or bathroom or building a house or extension, DeviMat provides a selection of cost-effective, reliable and easy-to-install solutions.

DeviMat provides efficient underfloor warming in new or existing buildings – e.g. bathrooms, , kitchens, conservatories or anywhere that requires comfortable warmth. It can be used as the only heating source or as an additional source for creating comfortably warm floors. Suited to all new and renovated solid and wooden floors, DeviMat requires no maintenance whatsoever or associated servicing costs. It is guaranteed for 10 years.

Providing comfort at floor level where it is best needed, this system minimises dust and air movements. It also allows greater versatility in furnishing placements and interior design by freeing up valuable wall and floor space that conventional radiator systems would otherwise occupy.

DeviMat cable matting consists of a thin (3.5 mm) earth-screened heating cable affixed to a self-adhesive open mesh. Installation of DeviMat heating is extremely easy and can be carried out by unskilled workers. Only the final quick electrical connections need to be made by qualified staff.

After preparing the surface, in some cases a small groove needs to be channelled in the floor to house a floor thermostat tube. The matting is then simply rolled out, cutting the backing material as appropriate to turn corners or to skirt round fitments. Twin conductor cables require connection at one end only. The entire layer can then be covered by a) one layer of flexible tile adhesive/self-levelling compound that is allowed to dry before tiling or b) by laying tile adhesive and tiles in one operation.

Two types of DeviMat are available – DTIF-100 and DTIF-150. These may be purchased in various lengths from 1m up to 12m to suit the floor area being heated. The width of the mat is 500 mm.

DTIF-100 is suitable for timber-based floors, delivering a maximum heating load of 100 W/m2 DTIF-150 is intended for concrete-based floors with a maximum heating load of 150 W/m2 .

DeviMat systems are ideally controlled by a flush-mounting, intelligent 7-day programmable thermostat, the DeviReg 550, which regulates floor temperature. This can control heating loads up to 3600 Watts and comes with a floor sensor on a 2.5m cable. Alternatively, the wall mounted dial setting thermostat DeviReg 130 (also supplied with a floor sensor) is available.

Devi (part of the Danfoss Group) is an acknowledged supplier of proven, relevant products for the underfloor heating industry.

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DEVI Home Floor-Heating Products Now Supported From Bedford

Tue, 14 Apr 2009 10:54:00 GMT

DEVI Home Floor-Heating Products Now Supported From Bedford

Full customer support for the Devi range of domestic underfloor heating products has now been transferred to Danfoss Randall Limited at Bedford, where these products will complement the company’s comprehensive selection of thermostats, controls, manifolds and other fittings required in this sector of the heating market. Devi has been a member of the Danfoss Group since the beginning of 2003.

Customers will benefit from improved ordering access, information and assistance for all these closely related products. Danfoss Randall now provides support for the following UFH products:

DeviFlex Heating Cables

DeviMat Cable Matting

DeviReg Thermostats

Hard-wired Controls for Water-based Systems

RF (Wireless) Controls for Water-based Systems

Manifolds

Thermal Actuators
Self-acting UFH Controls

These products are available from a growing number of builders’ merchants plus numerous heating, flooring and tiling stockists who will all benefit from Danfoss marketing support.

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New opportunities for installers thanks to mobile connection to the Internet

Tue, 07 Apr 2009 14:04:00 GMT

New opportunities for installers thanks to mobile connection to the Internet

Danfoss Randall has launched a new facility, called mobile view, which makes it possible for installers to access product information at www.danfoss-randall.co.uk using a mobile phone.

Installers now have access to the same information as that available on the Internet, however, the layout is adapted to the small screen of the mobile phone.

Søren Hansen, Market Intelligence Manager, says that the new facility is based on the installers’ request for easy access to information.

”Of course, the information is available to the installers on the Internet, but how many would bring a computer with them when visiting customers? I’d say not many, whereas everybody has a mobile phone and at the same time, it is getting increasingly common for mobile phones to have access to the Internet and they also often have very large screens.”

New Controls Technologies Essential

Tue, 31 Mar 2009 23:00:00 GMT

New Controls Technologies Essential

Traditional domestic central heating controls - programmers, room thermostats, cylinder thermostats, etc. - have, until now, served us very well. They have improved home comfort levels and, while utility prices increased, moderated our fuel bills. It is easy to be complacent against this backdrop.

However, far greater energy savings are now being demanded as the nation strives to achieve its low carbon economy.

New technologies needed

Current mainstream controls are magnificent examples of design and engineering and will continue to do what they were designed for; but we have refined them to the point where their further significant development no longer seems feasible. We must look to new technologies to achieve the additional savings that are now so important.

Many installers seem reluctant to adopt advantageous controls advances and yet only minimal (if any) extra training is required and cost impacts on the user are relatively low. As these changes seem unavoidable, why not act sooner than later.

Effect of condensing boilers

One recent factor in the controls evolution process has been that high-efficiency condensing boilers are now mandatory in new-build and most refurbished private housing.

Regretfully, simply installing a Class A condensing boiler does not automatically achieve the high energy-savings that its SEDBUK rating might suggest. Unless the heating system’s controls are sufficiently responsive to allow the boiler to operate in condensing mode for reasonable periods, any savings are likely to be insignificant. This is especially true when old boilers are being replaced and the existing heating controls are left unchanged.

Room thermostats

Most electro-mechanical, bi-metal room thermostats that were always considered to be low-cost, reliable, functional and easy to use are just not responsive enough to sustain a boiler in condensing mode for any length of time. Obviously, if a condensing boiler is not allowed to condense, it offers little or no advantage over a standard appliance.

The solution is to simply fit a more responsive electronic On/Off thermostat that can make all the difference, and restore the functionality of the boiler.

Programmable room thermostats

We need to go much further than using simple room thermostats controlling at one preset room temperature to achieve the extra savings required.

Central heating systems should provide heat only when it is needed. During most weeks, there are regular periods when houses are unoccupied (shopping, dog walking, visiting, etc.) and others when lower room temperatures are acceptable (e.g. morning housework). A programmable room thermostat enables these low and zero heating periods to be implemented in a way not possible with a single-temperature control.

The electronic sensor and switching action of a programmable room thermostat will ensures a condensing boiler operates to full effect. These flexible controls, having been available for some years, cannot be designated as latest technology but fitting one in a house can make a huge saving on the heating bills.

Chrono-proportional control

What more can we do? Should we also be questioning whether On/Off control is still appropriate? To make the ambitious savings targets now required, should we take a lead from commercial HVAC systems and use modulating control?

The use of chrono-proportional controls domestically can produce a very marked improvement on even the performance of programmable room thermostats.

Chrono-proportional control, instead of reacting to temperature events and going through On/Off cycles, splits each hour into sections (usually 6) and the controller calculates the proportion of these periods for which the boiler fires to maintain desired comfort levels. This modulating control mode provides a closer control band and faster reaction to temperature change, resulting in improved energy savings and better home comfort.

Closely controlled tests carried out by Danfoss Randall showed that using a simple mechanical thermostat meant the energy-saving benefits of a replacement high-efficiency condensing boiler were lost because the boiler rarely operated in condensing mode. Using an on/off electronic room thermostat in the same set-up produced reductions of over 2% in both energy cost and carbon emissions.

However, the use of an electronic thermostat operating in chrono-proportional mode provided closer temperature control plus possible reductions of 10% in both fuel cost and carbon emissions.

Looking ahead

Tomorrow’s central heating controls will need to go beyond the capabilities of traditional mainstream devices. They must be flexible enough to save energy that has previously been wasted. What’s more, they need to be installed now!

Heating installers should not be nervous about looking at all technological advances introduced – chrono-proportional control, optimum start, weather compensation and more – and using these advances to best advantage for their clients.

New Danfoss Product Selection Guide - Commercial Products

Thu, 19 Mar 2009 23:00:00 GMT

New Danfoss Product Selection Guide - Commercial Products

Danfoss Randall Limited has published a new full-colour Product Selection Guide (PSG) that comprehensively illustrates and describes in crystal-clear detail the company’s extensive range of stand-alone products for HVAC, commercial heating/cooling and building services applications.

Many engineers may be surprised by the numbers of these essential products and variations that are now available from Danfoss. They include thermostatic radiator valves and controls, motorised control valves, balancing valves, thermostatic mixing valves and advanced room thermostats. Widely compatible with most popular building systems, their Danfoss pedigree is an assurance of top performance and long-term reliability.

The new commercial PSG is not just a product listing. It is a must-have 72-page quality-produced booklet that also provides information on working principles and systems, cross-reference guides and more. There is much to be learned from its pages and it is sure to be invaluable for anyone involved in commercial heating, cooling and ventilating.

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Important New RF Programmable Room Thermostat

Sun, 15 Mar 2009 23:00:00 GMT

Important New RF Programmable Room Thermostat

Superbly easy to operate and install, Danfoss Randall’s new TP4000 RF (wireless) programmable room thermostat is ideal for use with combination boiler systems and those numerous basic room temperature control applications that call for same-each-day programming. Today’s prominence of combination boilers, and the growing need for controls simplicity, means this unit is sure to appeal to a major sector of today’s domestic central heating controls market.

The stylish wall-mounted TP4000 RF incorporates all the features of the existing popular TP4000 and brings the additional installation benefits that come with RF (wireless) controls, i.e. no long fixed-wiring runs, no lifting floorboards, no channelling walls and no subsequent making good. The programmable controller transmits unique, secure radio signals up to 30 metres away to a hard-wired RX1 receiver unit located close to the boiler or other appropriate control component.

The TP4000 RF’s large, easy-to-read LCD panel displays AM/PM times. Being battery operated (2 x AA), it requires only two-wire connection when replacing existing thermostats.

Its factory-set switching programme, which is easy to modify as desired, makes setting of the switching times even easier. Up to six automatic changes of room temperature each day allow the heating system operation to match the householder’s lifestyle. Heat is used only when required, creating improved comfort conditions whilst making substantial energy savings.

Preset regular temperature settings can be temporarily over-ridden as is needed simply by pressing a button to change On to Off or vice versa. The regular programme resumes automatically after each change has occurred. There is also an adjustable ‘frost protection’ setting feature.

TP4000 RF Data:

Setting range: 5°C – 30°C, Off

Events per day: 6

Clock display: AM/PM or 24 hour

Preset programme: Yes (easily modified as desired)

Temp. Override: Yes

Frost protection: Yes

Output voltage rating: 10-230Vac

Output current rating: 3(1)A

Output switching: 1 x SPDT, type 1B

Max. Ambient temp.: 45°C

Power supply: 2 x AA/MN1500/LR6 alkaline batteries

Memory retention: Events - retained for life; Time - 1 min. to change batteries

Transmission frequency: 433.92 MHz

Transmission range: 30 metres

The Danfoss Randall TP4000 RF Programmable Room Thermostat is an important control for the times.

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Danfoss Randall United Kingdom - News from Danfoss Randall

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Keep mobile with new Danfoss assist

Danfoss Randall strengthens 'no quibble' warranty for controls

Frequently asked questions about installing heating controls

Part L made easy with new guide to heating controls from Danfoss Randall

New High-Output Underfloor Heating Mat

New Manifold System Introducecs Cutting-Edge Features

Danfoss Launch CPD Seminars

Advanced and Easy Wireless Floor-Heating Controls

The Whole Controls System Must Be Right

The Need for Advanced Heating Controls

TRV's Are Essential

Devimat Cost Effective Invisible Heating

DEVI Home Floor-Heating Products Now Supported From Bedford

New opportunities for installers thanks to mobile connection to the Internet

New Controls Technologies Essential

New Danfoss Product Selection Guide - Commercial Products

Important New RF Programmable Room Thermostat

Danfoss Randall
United Kingdom - News from Danfoss Randall