ESCTDEB Electronic Dual Cylinder Thermostat* User and Installation Instructions * Patent pending
INDEX User Instructions What is a Cylinder Thermostat? 1 Introduction to the CTDEB 2 Holiday Switch 4 Installation Instructions Technical Data 5 Installation Safety Instructions and General Safety Instructions 6 Maintenance and Safety Notice 7 Fitting the Cylinder Thermostat 8 Boiler Setting 8 Adjusting and Resetting the Cylinder Thermostat 9 Adjusting the 1 Hour Boost 9 Wiring Examples: S Plan, S Plan with Weather Compensator and Y Plan 10 Wiring Diagram 13
User Instructions
What is a Cylinder Thermostat?...An explanation for householders A cylinder thermostat switches on and off the heat supply from the boiler to the hot-water cylinder. It works by sensing the temperature of the water inside the cylinder, switching on the water heating when the temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. Turning a cylinder thermostat to a higher setting will not make the water heat up any faster. How quickly the water heats up depends on the design of the heating system, for example, the size of the boiler and the heat exchanger inside the cylinder. The water heating will not work if a time switch or programmer has switched it off. And the cylinder thermostat will not always switch the boiler off, because the boiler sometimes needs to heat the radiators. Cylinder thermostats are usually fitted between one quarter and one third of the way up the cylinder. The cylinder thermostat will have a temperature scale marked on it, and it can be adjusted to the chosen temperature, then left to do its job. The thermostat must be designed to kill off harmful bacteria in the water. Raising the temperature of the stored hot water unnecessarily results in wasted energy and increases the risk of scalding. 1
Dual cylinder thermostats combine both the controller and the limit thermostats into one common unit. If you have a boiler control thermostat, it should always be set to a higher temperature than that of the cylinder thermostat. In most boilers, a single boiler thermostat controls the temperature of water sent to both the cylinder and radiators, although in some there are two separate boiler thermostats. Introduction to the ESCTDEB (Electronic Dual Cylinder Thermostat) The ESi Controls Electronic Dual Cylinder Thermostat* is a revolutionary new energy saving product, developed exclusively by ESi Controls. It is a direct** and economical replacement for traditional mechanical dual cylinder thermostats. With real safety and energy saving benefits and providing accurate temperature control, it also features a clear and informative LCD display. The hot water can be stored at any desired temperature between 25oC and 65oC, with the confidence that the weekly automatic one hour boost to above 60oC kills any legionella bacteria, resulting in substantial energy saving. The LCD display shows the current water temperature and the user defined water temperature, while the red LED indicates that the unit is calling for heat. The 2
sensitive electronic sensors operate at a far greater accuracy than conventional oil filled mechanical dual thermostats, and do not need physical contact unlike traditional dual thermostats. The large dial makes it easy to set the required controller temperature (between 25oC and 65oC). While the second (limit) safety thermostat is pre-set to 80oC with a concealed manual reset, to comply with building regulations. *Patent Pending ** Refer to installation and wiring instructions. 3
Holiday Switch This is the black button located under the display (Fig.1, page 4). Press and hold the holiday switch for a minimum of 10 seconds until you hear an audible click, and this switches the ESCTDEB off completely so there is no water heating and no weekly boost heating. This feature should only be used when the property is vacant for extended periods and there is no requirement for water heating or for the weekly boost. Pressing and holding the holiday switch again (for a minimum of 10 seconds until you hear an audible click) will restart the ESCTDEB, the display will show the cylinder temperature and the weekly boost will immediately start and recur every 1-7 days depending on the user set position (see page 9) at the same time. Holiday Switch Fig.1 4
Installation Instructions
Technical Data Electronic Dual Thermostat Power Supply Supply Power Switch Action 230 VAC 50-60Hz SPDT (control), SPST (limit) 230 VAC 6(1)A Temperature Setting Range 25oC to 65oC Automated Automated Boost Boost As per user setting (see page 9) Limit 230 VAC 50-60Hz Limit Thermostat Thermostat 80oC with concealed manual reset Tolerance 230 VAC 50-60Hz Tolerance Switching 230 VAC 50-60Hz Switching Differential Differential <1oC Protection Rating Dimensions230 VAC 50-60Hz Dimensions 230 VAC 50-60Hz Complies with 5 2 oc IP30 L: 110mm x H: 92mm x W: 48mm (excluding flanges) EMC (89/336 & 92/32 EEC) BS EN 60730-1: 2000, BS EN 60730-2-9: 2002. LVD (73/23/ EEC) (93/68/EEC) BS EN 60730-1:2000, BS EN 60730-2-9:2002
Installation Safety Instructions The unit must be installed by a suitably qualified person in accordance with the latest IEE Wiring Regulations. N.B Isolate mains supply before commencing installation. Please read all instructions before proceeding. Ensure that the fixed wiring connections to the mains supply is via a fuse rated at not more than 6 amps and class A switch having a contact separation of a minimum of 3mm in all poles. The recommended cable sizes are 1.0mm sqr or 1.5mm sqr. No earth connection is required as the product is double insulated but ensure continuity of earth throughout the system. General Safety Instructions Only use this product for control of domestic hot water. Do not restrict safety valve outlets. WARNING! Take great care to avoid scalding if you do not have a thermostatic mixing valve fitted, during the weekly one hour disinfection boost the hot water temperature will be over 60oC. 6
Maintenance Always isolate the mains supply before commencing any work, servicing or maintenance on the system. And please read all instructions before proceeding. Arrange for an annual maintenance and inspection schedule to be carried out by a competent person on every part of the heating and hot water system. Safety Notice WARNING! ALWAYS ISOLATE THE AC MAINS SUPPLY BEFORE INSTALLING. THIS PRODUCT MUST BE FITTED BY A QUALIFIED PERSON, AND INSTALLATION MUST COMPLY WITH THE GUIDANCE PROVIDED IN THE CURRENT EDITIONS OF BS767 (IEE WIRING REGULATIONS) AND PART P OF THE BUILDING REGULATIONS. 7
Fitting the Cylinder Thermostat 1. Slacken the three fixing screws, and insert both sensors fully into the pocket. 2. Position the thermostat onto the pocket. 3. Tighten the three screws to secure the thermostat, take care not to over tighten. 4. Complete the wiring connections. N.B! As a safety feature, when first connected the Electronic Dual Cylinder Thermostat will call for heat until the hot water cylinder has reached 61oC and held that temperature for one hour. During this time there will be a live output to the DHW zone valve and therefore to the boiler and the pump. Boiler Setting To ensure the elimination of Legionella Bacteria in the Hot Water Cylinder, at least once a week the Cylinder should be heated to 61oC. This is carried out automatically by the ESCTDEB. The Boiler Thermostat (output temperature) must therefore be set to maximum and homeowners should be made aware that once a week the hot water will be warmer following the automatic weekly boost. We also therefore strongly recommend the use of a thermostatic mixing valve (TMV), these blend hot water with cold water to ensure constant safe shower and bath outlet temperatures, preventing scalding. 8
Adjusting and Resetting the Cylinder Thermostat Adjust the dial to show the desired hot water temperature on the display, between 25oC to 65oC. The lower the temperature, the less chance of scalding and the more energy saving. Most homeowners find a temperature between 48oC-53oC to be adequate. If the system should overheat, the cause must be determined and resolved by a suitably qualified person. In the event of an overheat, the thermostat cuts out automatically. The reset for the thermostat is under the adjustment dial. Adjusting the 1 Hour Boost The ESCTDEB has user defined settings where the duration of the Legionella Override can be adjusted from 1 to 7 days or completely disabled to operate as a conventional Dual Cylinder Thermostat. 1. To disable/adjust the legionella boost turn the unit off by pressing and holding down the HOLIDAY button until an audible click is heard and the red LED turns off. 2. Release the button and after approx. 10 seconds press and hold the HOLIDAY button again. After 5 seconds the red LED will light up and an audible click is heard, keep the HOLIDAY button pressed for a further 5 seconds until the LCD display flashes. 3. Release the button and use the HOLIDAY button to choose between disabling the override (OF) or setting the delay between the overrides from 1 7 days. 4. Once selected, release the button and the unit will return to the user set 9
position within 5 seconds. 5. Press and hold the HOLIDAY button for a further 5 seconds to confirm your selection. Wiring Example: S Plan 10
Wiring Example: S Plan with Weather Compensator 11
Wiring Example: Y Plan 12
Wiring Diagram 1 N L Common Hot Water ON (N/O) Hot Water OFF (N/C) This product requires a fused permanent Live and Neutral supply. As shown in the wiring examples, the NC (normally closed) terminal is only used in Y Plan systems with a Mid Position 3 Port Zone Valve, or when the installation is using Weather Compensation. 13
Version 6.2.2