Dorchester Water Heater Brochure

Hot WaterSystems Guide to Direct Fired Dorchester Water Heaters from HamworthyHamworthyDorchester Water HeatersNew DR-FC Evo Condensing Up to 107% seasonal efficiency Higher outputs Low Noise2 PageOptions 4 SpecificationsDR-FC Evo 6 Condensing, room sealedDR-RS Range 8 Room sealed, multi-tubeDR-LA Range 10Fully automatic, multi-tubeDR-LP Range 12Permanent pilot, multi-tubeDR-SA Range 14Fully automatic, single-tubeDR-SE Range 16Permanent pilot, single-tubeDR-PF Range 18Power flame, multi-tubeRoom Sealed Flues 20DR-FC Evo and DR-RS rangesContents OverviewHamworthy have introduced the new Dorchester DR-FC Evo condensing direct fired water heater range with more models, higher outputs, low noise and seasonal efficiency up to 107% nett. An extremely efficient method of generating hot water is further enhanced by the versatile flue system, which now has longer flue run capability, to enable the units to be installed almost anywhere in the building.The Dorchester range of water heaters offers a great choice of outputs, storage capacities, flue arrangements, fuel supply and condensing models, to provide a practical and efficient means of producing domestic hot water for a wide range of applications.Direct fired water heaters have been proven over many years as an energy efficient solution for the generation of hot water, separated from the space heating system. The hot water can be generated close to the point of use, reducing heat losses through the distribution system, and reducing installation and maintenance costs associated with pipework and insulation.The room sealed DR-RS range brings another dimension to direct fired water heaters, offering increased flexibility in choice of location for the unit, and fluing options with either horizontal or vertical concentric terminal arrangements.Multi-tube heaters in the DR-LA and DR-LP ranges provide faster heat up and recovery times to respond efficiently and effectively to system demands for hot water. Available with fully automatic ignition or permanent pilot, the choice is yours.The DR-SA and DR-SE water heaters have single-tube heat exchangers for economic operation with low standing losses, and again the choice of fully automatic ignition, or permanent pilot.Natural Gas is the popular choice of fuel, and all Dorchester models are also available with LPG as an option. The DR-PF range provides further alternatives with oil fired Riello burners across the range, and with outputs at the top end up to 3241 litres/hour.The chart below shows the outputs and storage capacities at a glance across the 41 models in the Dorchester range.#1?%"Ð$UNÐ?? #1?%"Ð$UNÐ??? ?? ? ?? ? ? ?? #1?%"Ð$UNÐ??#1?%"Ð$UNÐ??#1?%"Ð$UNÐ??#1?%"Ð$UNÐ??#1?%"Ð$UNÐ???NEW3The Dorchester range of water heaters are manufactured to the highest standards using the latest production technology to ensure a high quality long lasting finish in every product configuration. Compliance is assured with stringent controls in accordance with the European Directives for CE marking, and all models are Water Regulations Advisory Scheme (WRAS) approved.ConstructionThe water heater cylinders are constructed from high grade steel and coated with a high quality vitreous enamel lining. The fabrication of the cylinder and welding is completed fully before the glass lining is applied, ensuring that the integrity of the lining is not affected during manufacture. On completion of the fabrication, the cylinder undergoes a precise glass coating process where the unit is rotated in every direction to ensure an even coating is applied throughout. Surplus material is drained before the unit is baked at 840°C to complete the adhesion of the lining to all internal surfaces of the cylinder, providing a long lasting finish.The cylinder is covered with a 50mm layer of CFC free foam insulation to ensure that standing losses are kept to a minimum. Heat ExchangerMultiple vertical fire tubes are arranged through the centre of the cylinder in the DR-RS, DR-L and DR-PF ranges. Each fire tube is fitted with a steel baffle in order to maximise heat transfer. The DR-S range of water heaters use a single vertical fire tube in the centre of the cylinder.SpecificationDorchester Direct Fired Water HeatersAnode ProtectionCylinders are fitted with removable magnesium sacrificial anodes ensuring excellent protection against corrosion. For areas of the country that have particularly soft water, which has conductivity of less than 200 micro-seimens, magnesium anodes may not be fully effective in providing protection against corrosion. The optional electrical anode protection system replaces the magnesium anodes and is effective in providing protection in any water conditions. A further benefit of this system is that it can remove the need for the full clearance required for maintenance above the heater, dependent on the model. It is essential that if the electrical anode protection system is fitted to a heater, then an uninterrupted 24-hour power supply must be maintained to ensure proper protection of the unit.Combustion Products Discharge Safety DeviceIf a water heater is to be installed in a habitable area then it is a requirement of EN 89 that it be fitted with a device that detects the spillage of combustion products and shuts down the appliance. A habitable area includes kitchens, shower blocks, workshops or any other area that is occupied.A combustion products discharge safety device is fitted as standard on all units with draught diverters, and comprises a thermostat that is fitted to the rim of the diverter. In the event of spillage of combustion products occurring, the thermostat will shut down the heater.Frost Protection System On DR-FC, DR-RS and DR-LA models, when the on/off switch on the control panel is in the off position, the frost protection system will initiate firing of the burner when the stored water temperature falls below 5°C. This provides protection against freezing in the cylinder.LPG FuelsIt is strongly recommended that on LPG installations, gas detection equipment is fitted and that this equipment is positioned near the heater and at low level. It is also imperative that the plant room is ventilated at high and low level.Controlling LegionellaAll Dorchester models are designed to meet the Health & Safety Commission (HSC) requirements for safe production of hot water, and in particular the control of Legionellosis.Legionella bacteria are common in natural water sources and therefore low concentrations may be present in many water systems. It is important that hot water services are designed and operated in such a way that these organisms are prevented from multiplying.Water temperature is a significant factor in controlling the risk, with optimum conditions for bacterial growth occurring between 20°C and 45°C. Regular cleaning of the system will help to avoid the build up of sediments, which may harbour or provide nutrients for the bacteria. Water stagnation may encourage the growth of biofilm, which can provide local conditions that may promote the proliferation of Legionella bacteria.Designed for SafetyThe HSC approved code of practice and guidance document L8 makes it clear that, if the risk of Legionella is to be minimised, then the departments recommendations must be observed in so far as they relate to hot & cold water systems.Dorchester water heaters conform to these requirements as follows: Good access for cleaning Generous flow and return connections Adequately sized drain Base designed to avoid sludge traps Anodes to reduce metal corrosion Number of tappings correctly positioned to facilitate recirculation, destratification and to obviate stagnation areas Designed to meet unvented supply requirementsOptionsFuelAll models in the Dorchester range are suitable for firing natural gas (G20), LPG propane or butane*. On the DR-PF range, oil (35 Sec Redwood No.1) is an alternative option. Fuel type must be specified at the time of ordering.*Butane not available on DR-RS 105.Unvented Supply KitAll Dorchester water heaters are suitable for installation in direct unvented systems. The expansion vessel is sized for the water heater and local pipework only and should be re-sized if used on larger systems. The unvented supply kit allows the water heater to be fed directly from the mains water supply or from a booster pump set without the need for header tanks. The kit contains all the essential components to comply with the Water Supply (water fittings) Regulations 1999, including a suitably sized pressure and temperature relief valve, which locates directly into the water heater.Flexible Magnesium Sacrificial Anodes Cylinders are fitted with removable magnesium sacrificial anodes ensuring excellent protection against corrosion. In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as a replacement option. The fixed anodes can be used from installation, and when in need of replacement then the flexible anodes can be used. Electrical Anode ProtectionIn areas of the country that have particularly soft water, which has conductivity of less than 200 micro-siemens per cm, such as Scotland, Devon and Cornwall, magnesium sacrificial anodes may not be fully effective in providing protection against corrosion. The optional electrical anode protection system is effective in providing protection in any water conditions. It is essential that if the electrical anode protection system is fitted to a heater, then an uninterrupted 24-hour power supply must be maintained to ensure proper protection of the unit.Close Temperature Control Kit For applications requiring above average temperature control, an optional electronic thermostat kit can be fitted. This will provide close control of the flow temperature within ±2.5°C, dependant on the operating conditions.Top to Bottom Recirculation KitIn order to prevent stratification within the heater, thus creating a zone of lower temperature water that can possibly lead to the proliferation of Legionella bacteria, an optional top to bottom re-circulation kit should be specified. By constantly returning water from the flow back into the base of the heater, a uniform temperature is maintained. The kit includes a pump, isolation valves, non return valve and pipework for fitting on site.The Dorchester range of direct fired water heaters offers a wide choice in models, and to supplement that choice, each range has a number of specific options available. Please refer to range pages to check availability.4Time Clock Control (DR-SE only)Where there is a requirement for the heater to be controlled by an external signal, such as a time clock or safety interlocks, then an optional control kit can be fitted. The kit comprises a solenoid valve that fits between the control valve and the burner. This kit will require a 230 volt, 50Hz single phase power supply.General InformationDeliveryDorchester water heaters are delivered factory assembled and mounted within frames, shrink-wrapped and on a timber pallet base. DR-FC and DR-RS models are equipped with a steel pallet base which is fitted permanently to the unit. Draught diverters on DR-LA and DR-LP models are supplied packaged separately for fitting on site. All Hamworthy products are delivered to site on a tail-lift vehicle, and deliveries are closely co-ordinated with the customer, to suit the site construction programme. Standard delivery is to ground level from the tail-lift vehicle. To enquire about special delivery services, please contact our customer services team.CommissioningHamworthy Heating Ltd strongly recommend that all water heaters are commissioned by their service department, who will issue an appliance log-book that details the initial operating settings, and which can be used to record all future maintenance work.For more information on commissioning contact Hamworthy Heating Service Department. Telephone 0845 450 2866 or email service@hamworthy-heating.comMaintenanceInstalled water heaters will experience a wide variation in operating conditions that can occur due to differing patterns of usage and the variable chemical nature of distributed water supplies. It is therefore strongly recommended that water heaters be drained and inspected within 3 months of the initial commissioning. Once the level of calcium deposition and rate of anode decay are established a suitable maintenance schedule can be implemented, however as a minimum all water heaters should be serviced annually.Water TreatmentDue to the variable chemical composition of distributed water supplies it is necessary to identify the properties of the cold water feed to the water heater.In common with all types of water heating equipment, scale will develop during normal use and it is therefore essential that the appropriate steps are taken to ensure reliable and continuous operation of the plant.Contact should be made with the local water provider to determine the quality of the feed water and reference should be made to water treatment specialists for appropriate advice.InstallationThe installation of all heaters MUST be in accordance with the relevant requirements of Gas Safety Regulations, I.E.E. Regulations and the bye-laws of the local water undertaking. It should also be in accordance with any relevant requirements of the local gas region, local authority and relevant recommendations of the following documents:British StandardsBS 6891: Installation of low pressure gas pipework of up to 28mm in domestic premises. BS 6644: Installation of gas fired hot water boilers - 60 kW to 2 MW. BS 6700: Design, installation, testing and maintenance of services supplying water for domestic use. BS 6880: Part 1, 2 & 3: Code of practice for low temperature hot water heating systems of output greater than 45 kW. CP 342: Centralised hot water supply. Part 2: Buildings other than individual dwellings. I. Gas. E. PublicationsIGE/UP/1 Soundness testing and purging of industrial and commercial gas installations.IGE/UP/1A Soundness testing and direct purging of small low pressure industrial and commercial natural gas installations.IGE/UP/2 Gas installation pipework, boosters and compressors in industrial and commercial premises.IGE/UP/10 Installation of gas appliances in industrial and commercial premises.5Dorchester DR-FC Evo RangeCondensing, Room SealedDirect Gas Fired Water Heaters Options Natural gas or LPG Unvented supply kit Horizontal or vertical flue terminal kit Top to bottom pump recirculation kitClearances: The DR-FC Evo heaters can be positioned very close to a wall or adjacent units, but access must be given to the flue area for checking the condensate trap, and to the inspection door for internal cleaning. The burner components are on top of the unit, where clearance must be provided for servicing.There is comprehensive control functionality on the Dorchester DR-FC Evo with electronic temperature control to achieve accurate flow and storage temperatures. Sensors fitted towards the top and bottom of the cylinder monitor temperature and control burner modulation, ensuring optimum performance combined with high seasonal efficiencies. Programming the settings is achieved via the neat easy to use control panel and features instant override for convenience, which resets automatically at the end of the next programmed period. The backlit display can show operating history, service diagnostics and alert to service due based on operating hours. The control incorporates an important safety function to perform regular anti-legionella purge cycles, running for a period at a higher temperature to prevent the risk of legionella bacteria forming in the vessel. This can be programmed to run automatically during periods when hot water will not be used, to minimise the risk of scalding.The water heaters are suitable for open vented or unvented systems using an optional unvented supply kit, and are complete with a frost protection thermostat supplied as standard. For further details of flue systems for the Dorchester DR-FC Evo, please refer to pages 22 and 23.The new Dorchester DR-FC Evo range of condensing water heaters from Hamworthy has increased outputs and seasonal efficiencies up to 107% nett. The DR-FC Evo is equipped with a modulating pre-mix burner and performance is achieved with overall noise levels below 45dBA, providing exceptionally quiet operation.Designed to operate as open flue or room sealed, the Dorchester DR-FC Evo is particularly suited to installations where the heater needs to be located closer to point of use. Twin duct flue systems can extend to100m overall length, whilst concentric flues can run up to an impressive 40m in length.The DR-FC Evo range consists of 7 models with continuous outputs from 596 to 2333 litres/hour, based on a 44°C temperature rise. Storage capacities range from 227 to 504 litres. Two or more water heaters can be installed where there is demand for larger loads.Fitted with a down firing pre-mix modulating burner, the hot gases are directed down into the spiralling heat exchanger coil, maintaining contact with the surface to effect maximum heat transfer. This design of the heat exchanger eliminates problems with scale as any build-up will fall away to the base of the unit and not affect heat transfer or create hot spots.%'W'X? ????????"$-X#&@RÄ"NMMDBSHNM#1?%"Ä$UNÄ??Ä?Ä??&@RÄ"NMMDBSHNM#1?%"Ä$UNÄ??Ä?Ä???"NMCDMR@SD"NMMDBSHNM#Q@HMÄ5@KUD#1?%"Ä$UNÄ??Ä?Ä??(MRODBSHNM#NNQ#Q@HMÄ5@KUD#1?%"Ä$UNÄ??Ä?Ä???"NKCÄ6@SDQÄ(MKDS'NSÄ6@SDQÄ.TSKDS 'NSÄ6@SDQÄ.TSKDS3?/Ä5@KUD3?/Ä5@KUD'NSÄ6@SDQÄ.TSKDS%KTDÄ"NMMDBSHNM/K@MÄ5HDV2HCDÄ5HDV%QNMSÄ5HDV(MRODBSHNM#NNQ&@RÄ"NMMDBSHNM#1?%"Ä$UNÄ??Ä?Ä???&@RÄ"NMMDBSHNM#1?%"Ä$UNÄ??Ä?Ä???&@RÄ"NMMDBSHNM#1?%"Ä$UNÄ??Ä?Ä??"NMCDMR@SD"NMMDBSHNM&'*6 2,1/**???NEW6Standard Features Modulating pre-mix burner Room sealed or open flue Fully automatic ignition Control thermostat range 40 to 80ºC Electrical anode protection Volt free fault output for remote alarm indication 7 day time clock, up to 3 operating periods per day Independent temperature setting for each time period Frost protection thermostat Anti-legionella purge cycle Quiet operation, <45dBAFlue OptionsPage 20 - 23Model DR-FC EVO 25DR-FC EVO 30DR-FC EVO 45DR-FC EVO 60DR-FC EVO 80DR-FC EVO 95DR-FC EVO 120Continuous output with 44ºC ?t (80ºF) l/h UK gal/h5961316261389642121158255161535519294242333513Storage capacity litres UK gal22750386853868538685504111504111504111Time to recover storage 44ºC ?t (80ºF) mins 23 37 24 20 19 16 13Heater output kW 30.5 32.0 49.3 59.3 82.6 98.7 119.4Maximum water pressure bar psig8116Gas input rate m³/hnatural gas (G20) ft³/h3.1109.53.21135.0176.66.0211.98.3293.110.1 356.712.3434.4Propane input gas rate at 37m bar m³/h(14.85 In wg) standard inlet pressure ft³/h1.0838.11.1540.61.8665.72.2077.73.15111.23.83135.24.39155.0Water flow and inlet connection in 1½" RGas connections in ¾" RcDrain connection (hose connection) in ¾" RcT & P valve connection in 1" NPTElectrical supply 230 V 50Hz 1PhAbsorbed power Watts 45 45 75 115 95 145 240Noise level dBA <45Model DR-FC EVO 25DR-FC EVO 30DR-FC EVO 45DR-FC EVO 60DR-FC EVO 80DR-FC EVO 95DR-FC EVO 120Overall height A 1485 2005 2005 2005 2060 2060 2060Heater centre line to pallet edge C 490 490 490 490 530 530 530Cylinder diameter D 705 705 705 705 850 850 850Pallet depth E 925 925 925 925 1000 1000 1000Pallet width F 850 850 850 850 900 900 900Concentric flue diameter G 100/150 100/150 100/150 100/150 130/200 130/200 130/200Flue height H 1460 2000 2000 2000 2015 2015 2015Gas connection K 1365 1895 1895 1895 1855 1855 1855Cold water inlet M 265 265 265 265 225 225 225Hot water outlet N 1485 2005 2005 2005 2060 2060 2060Inspection door P 265 270 270 270 290 290 290Drain R 180 170 170 170 225 225 225T&P valve S 995 1505 1505 1505 1425 1425 1425Condensate height W 220 240 240 240 240 240 240Flue position Hx 265 265 265 265 310 310 310Flue position Hy 375 375 375 375 440 440 440Flow position Ny 205 205 205 205 205 205 2057Dorchester DR-RS RangeRoom Sealed, Fully AutomaticDirect Gas Fired Water HeatersThe Dorchester DR-RS range is designed to operate as a room sealed system, making it particularly suited to applications where a conventional flue is impractical, or where the heater is be located closer to point of use. Units are available with either vertical or horizontal flue arrangements using twin duct or concentric flue systems. The DR-RS range consists of 5 models with continuous outputs from 517 to 1965 litres/hour, based on a 44°C temperature rise. Storage capacities range from 265 to 324 litres. Two or more water heaters can be installed where there is demand for larger loads.Options Natural gas or LPG Unvented supply kit Electrical anode protection Close temperature control kit Top to bottom recirculation kit Flexible magnesium sacrificial anodes Horizontal or vertical flue terminal kitThe DR-RS is fitted with an atmospheric burner with fully automatic ignition, and is suitable for firing natural gas or LPG. Volt free contacts are fitted as standard, and are compatible with building management systems (BMS) for monitoring the operation and status of the unit.At less than 60 dBa, the Dorchester DR-RS is quiet in operation and enables the unit to be installed close to point of use in a wide variety of locations. With a pallet based design, handling of the unit is made easier and this also reduces the risk of damage to the tank during transit and installation.The DR-RS range is designed to meet the latest HSC requirements for the control of Legionellosis. Two large inspection doors provide access for servicing and suitable tappings are included to facilitate top to bottom recirculation.The water heaters are suitable for open vented or unvented systems using an optional unvented supply kit, and are complete with a frost protection thermostat supplied as standard. In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option. For further details on room sealed flue systems, please refer to pages 20 & 21.8 Dimensions in mm DR-RS 25 DR-RS 40 DR-RS 65 DR-RS 85 DR-RS 105 Overall Height A 1995 1995 2020 2020 2020 Cylinder height B 1795 1795 1820 1820 1820 Twin duct air/flue G N/A 2 x 130 2 x 130 Concentric air flue L 80/125 100/150 130/200 N/A Gas connection K 600 750 Cold water inlet M 600 590 Hot water outlet N 1640 1655 Inspection door P 630 625 Drain R 520 525Standard Features Room sealed Fully automatic ignition Control thermostat range 40°C to 70°C Multi-tube heat exchanger Magnesium sacrificial anodes Volt free contacts - for lockout & normal run Two inspection doors Frost protection thermostatFlue OptionsPage 20 - 21 Model DR-RS 25 DR-RS 40 DR-RS 65 DR-RS 85 DR-RS 105 Continuous output with 44ºC ?t (80ºF) l/h 517 812 1295 1750 1965 UK gal/h 114 179 285 385 432 Storage capacity litres 324 312 265 265 265 UK gal 71 69 58 58 58 Time to recover storage 44ºC ?t (80ºF) mins 35 25 12 9 8 Heater output kW 26.4 41.5 66.2 89.4 100.4 Maximum water pressure bar 8 8 8 8 8 (open vented) Psig 116 116 116 116 116 Gas input rate m3/h 3.1 5.0 7.9 10.8 12.2 natural gas (G20) ft3/h 109.5 176.6 278.9 381.4 430.8 Propane input gas rate at 37m bar m3/h 1.2 2.0 3.2 4.4 4.9 (14.85 In wg) standard inlet pressure ft3/h 42.3 70.6 112.4 153.7 173.6 Water outlet and inlet connection in 11/2” Rp Gas connections in 3/4” Rp 1” RP Drain connection (hose connection) & Recirculation connection in 11/2” Rp T & P valve connection in 1” 11/2” Electrical supply 230V 50Hz 1Ph 9Dorchester DR-LA RangeFully Automatic, Multi-tubeDirect Gas Fired Water HeatersTwo large inspection doors provide access for servicing and maintenance, and the DR-LA range is designed to meet the latest HSC requirements for the control of Legionellosis. Connections are provided to facilitate top to bottom recirculation which ensures an even temperature is maintained throughout the vessel, preventing stratification.A fully electronic soft start gas valve and hot surface ignition ensures reliable burner operation and minimal electro magnetic interference. The water heaters are suitable for open vented or unvented systems using an optional unvented supply kit, and are complete with a frost protection thermostat supplied as standard.In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option.All models are available with an optional draught diverter to provide a horizontal flue take-off. This must be specified at the time of ordering.Gas connection3/4” Rp (30 - 95)1” Rp (110)Inspection door100mm diaThere are 7 models in the DR-LA range with continuous outputs from 621 to 2105 litres/hour, based on a 44°C temperature rise. Storage capacities range from 264 to 374 litres. Two or more water heaters can be installed in a modular configuration where there is demand for larger loads.The DR-LA is fitted with an atmospheric burner with fully automatic controls utilising hot surface ignition. The water heaters are suitable for firing natural gas or LPG, and have volt free contacts fitted as standard. The pre-wired control panel includes on/off switch, control thermostat, power indicator, lockout indicator and reset button.Options Natural gas or LPG Unvented supply kit Electrical anode protection Close temperature control kit Top to bottom recirculation kit Flexible magnesium sacrificial anodes Draught diverter with horizontal take off10 Dimensions in mm DR-LA 30 DR-LA 40 DR-LA 45 DR-LA 60 DR-LA 75 DR-LA 95 DR-LA 110 Overall height A 1900 2100 1900 2040 2000 2025 2085 Cylinder height B 1760 1960 1760 1900 1795 1810 1870 Width including draught diverter E 1100 1105 Width including control column F 800 Flue spigot diameter G 150 180 225 Flue spigot centre line H 640 675 Flue spigot centre line J 1840 2040 1840 1980 1935 1950 2010 Gas connection K 400 340 400 340 205 Cold water inlet M 565 505 575 590 650 Hot water outlet N 1605 1810 1605 1750 1640 1655 1715 Inspection door P 730 670 740 765 855 Drain R 500 515 500 455 525 540 595 T & P Valve S 1550 1760 1550 1700 1595 1600 1660Standard Features Fully automatic ignition Multi tube heat exchanger Control thermostat range 40°C to 70°C Magnesium sacrificial anodes Volt free contacts - for lockout and normal run Two inspection doors Combustion products discharge safety device Draught diverter with 45 degree take-off Frost protection thermostat Model DR-LA 30 DR-LA 40 DR-LA 45 DR-LA 60 DR-LA 75 DR-LA 95 DR-LA 110 Continuous output with 44oC ?t (80°F) l/h 621 822 965 1199 1427 1838 2105 UK gal/h 137 181 212 264 314 405 463 Storage capacity litres 324 374 312 351 291 265 264 UK gal 71 82 69 77 64 58 58 Time to recover storage 44oC ?t (80°F) mins 32 28 20 16 13 9 7 Heater output kW 31.7 42.0 49.3 61.2 72.9 93.9 107.5 Maximum water pressure bar 8 (open vented) Psig 116 Gas input rate m3/h 4.0 5.4 6.3 7.8 9.4 12.1 13.7 natural gas (G20) ft3/h 142.0 190.0 223.5 275.4 330.9 425.9 483.8 Propane input gas rate at 37m bar m3/h 1.6 2.2 2.5 3.1 3.8 4.9 5.5 (14.85 In wg) standard inlet pressure ft3/h 57.2 76.6 90.1 110.9 133.4 171.6 195.0 Water flow and inlet connection in 11/2” Rp Gas connections in 3/4” Rp 1” Rp Drain connection (hose connection) & Recirculation connection in 11/2” Rp T&P Valve Connection in 1” 11/2” Draught diverter spigot ID mm 150 150 180 180 225 225 225 in 6 6 7 7 9 9 9 Electrical supply 230V 50Hz 1Ph11Dorchester DR-LP RangePermanent Pilot, Multi-tubeDirect Gas Fired Water HeatersThe DR-LP is fitted with an atmospheric burner with permanent pilot ignition. The water heaters are suitable for firing natural gas or LPG.All Dorchester water heaters are constructed with high-grade carbon steel and utilise a vitreous enamel lining. Additional tank protection is provided by magnesium sacrificial anodes. In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option. The cylinder is covered with a 50mm layer of CFC free foam insulation to ensure that standing losses are kept to a minimum.The DR-LP is suitable for open vented or unvented systems using an optional unvented supply kit. The DR-LP range is designed to meet the latest HSC requirements for the control of Legionellosis. Two large inspection doors provide access for servicing and suitable tappings are included to facilitate top to bottom recirculation.Where optional electrical anode protection is fitted, a permanent 230 volt 50Hz single phase power supply will be required, to ensure the water heater has 24 hour protection.All models are available with an optional draught diverter to provide a horizontal flue take-off. This must be specified at the time of ordering.Gas connection3/4” Rp (30 - 95)1” Rp (110)Inspection door100mm diaThe Dorchester DR-LP range is the permanent pilot version, based on the DR-LA, and consists of 6 models with continuous outputs ranging from 621 - 1838 litres/hour, based on a 44°C temperature rise. Storage capacities range from 265 to 374 litres. Two or more water heaters can be installed in a modular configuration where there is demand for larger loads.Options Natural gas or LPG Unvented supply kit Electrical anode protection Top to bottom recirculation kit Flexible magnesium sacrificial anodes Draught diverter with horizontal take-off12 Dimensions in mm DR-LP 30 DR-LP 40 DR-LP 45 DR-LP 60 DR-LP 75 DR-LP 95 Overall height A 1900 2100 1900 2040 2025 2085 Cylinder height B 1760 1960 1760 1900 1795 1810 Width including draught diverter E 1100 1105 Width including control column F 800 Flue spigot diameter G 150 180 225 Flue spigot centre line H 640 675 Flue spigot centre line J 1840 2040 1840 2040 1935 2010 Gas connection K 205 145 205 145 Cold water inlet M 565 505 575 590 Hot water outlet N 1605 1810 1605 1750 1640 1655 Inspection door P 730 670 740 765 Drain R 500 515 500 455 525 540 T&P valve S 1550 1760 1550 1700 1595 1600Standard Features Permanent pilot ignition Multi tube heat exchanger Control thermostat range 40ºC to 70ºC Magnesium sacrificial anodes Two inspection doors Combustion products discharge safety device Draught diverter with 45 degree take-off Model DR-LP 30 DR-LP 40 DR-LP 45 DR-LP 60 DR-LP 75 DR-LP 95 Continuous output with 44ºC ?t (80ºF) l/h 621 822 965 1199 1427 1838 UK gal/h 137 181 212 264 314 405 Storage capacity litres 324 374 312 351 291 265 UK gal 71 82 69 77 64 58 Time to recover storage 44ºC ?t (80ºF) mins 32 28 20 16 13 9 Heater output kW 31.7 42.0 49.3 61.2 72.9 93.9 Maximum water pressure bar 8 (open vented) Psig 116 Gas input rate m3/h 4.0 5.4 6.3 7.8 9.4 12.1 natural gas (G20) ft3/h 142.0 190.0 223.5 275.4 330.9 425.9 Propane input gas rate at 37m bar m3/h 1.6 2.2 2.5 3.1 3.8 4.9 (14.85 In wg) standard inlet pressure ft3/h 57.2 76.6 90.1 110.9 133.4 171.6 Water flow and inlet connection in 11/2” Rp Gas connections in 3/4” Rp Drain connection (hose connection) & Recirculation Connection in 3/4” NPT T&P Valve Connection in 1” 11/2” Draught diverter spigot ID mm 150 150 180 180 225 225 in 6 6 7 7 9 9 Electrical supply 230V 50Hz 1Ph13Dorchester DR-SA RangeFully Automatic, Single-tubeDirect Gas Fired Water HeatersThe DR-SA range is designed to meet the latest HSC requirements for the control of Legionellosis. A large inspection door provides access for servicing and suitable tappings are included to facilitate top to bottom recirculation.Suitable for open vented or unvented systems, the DR-SA range has an optional unvented supply kit which contains all the additional parts required to satisfy the Water Supply (water fittings) Regulations 1999. All Dorchester water heaters are constructed with high grade carbon steel and utilise a vitreous enamel lining. Additional tank protection is provided by a magnesium sacrificial anode. In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option. The DR-SA range consists of two models with continuous outputs of 309 litres/hour and 352 litres/hour, based on a 44°C temperature rise. Storage capacities are 278 litres and 372 litres respectively. Two or more water heaters can be installed in a modular configuration where there is demand for larger loads.The DR-SA is fitted with an atmospheric burner with fully automatic ignition suitable for firing natural gas or LPG. The water heaters incorporate a fully electronic gas valve, spark ignition system, control and high limit thermostats, safety thermostat, a lockout indicator light and reset button. A further thermostat is located on the draught diverter as a combustion products discharge safety device, to detect flue gas spillage and to shut down the burner in the event of a down draught condition.Options Natural gas or LPG Unvented supply kit Electrical anode protection Top to bottom recirculation kit Flexible magnesium sacrificial anode1415 Model DR-SA 16 DR-SA 19 Continuous output with 44°C ?t (80°F) l/h 370 393 UK gal/h 81 86 Storage capacity litres 278 372 UK gal 61 82 Time to recover storage 44°C ?t (80°F) mins 55 60 Heater output kW 18.9 20.1 Maximum water pressure bar 8 (open vented) Psig 116 Gas input rate m3/h 2.4 2.5 natural gas (G20) ft3/h 84.7 88.3 Propane input gas rate at 37m bar m3/h 1.0 1.1 (14.85 In wg) standard inlet pressure ft3/h 35.3 38.8 Water flow and inlet connection in 1” NPT 11/4” NPT Gas connections in 1/2” Rp Drain connection (hose connection) & Recirculation connection in 3/4” NPT Draught diverter spigot ID mm 130 in 5 Electrical supply 230V 50Hz 1PhStandard Features Fully automatic ignition Single tube heat exchanger Control thermostat range 40ºC to 80ºC Magnesium sacrificial anodes Inspection door Combustion products discharge safety device Draught diverter Dimensions in mm DR-SA 16 DR-SA 19 Overall height A 1585 1780 Cylinder height B 1450 1640 Cylinder diameter D 645 675 Width including control housing F 770 775 Gas connection L 355 370 Cold water inlet M 1505 1685 Hot water outlet N 1505 1685 T&P valve S 1280 1460 Anode clearance H 1000 130015Dorchester DR-SE RangePermanent Pilot, Single-tubeDirect Gas Fired Water HeatersAll Dorchester water heaters are constructed with high grade carbon steel and utilise a vitreous enamel lining. Additional tank protection is provided by a magnesium sacrificial anode. In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option. The cylinder is covered with a 50mm layer of CFC free foam insulation to ensure that standing losses are kept to a minimum.The Dorchester range is designed to meet the latest HSC requirements for the control of Legionellosis. A large inspection door provides access for servicing and suitable tappings are included to facilitate top to bottom recirculation.The DR-SE is suitable for open vented or unvented systems. An optional unvented supply kit contains all of the additional parts required to satisfy the Water Supply (water fittings) Regulations 1999.Where optional electrical anode protection is fitted, a permanent 230 volt 50Hz single phase power supply will be required, to ensure the water heater has 24 hour protection.The Dorchester DR-SE range is the permanent pilot version, based on the DR-SA, and consists of two models with continuous outputs of 309 litres/hour and 352 litres/hour, based on a 44°C temperature rise. Storage capacities are 278 litres and 372 litres respectively. Two or more water heaters can be installed in a modular configuration where there is demand for larger loads.The DR-SE is fitted with an atmospheric burner with permanent pilot ignition suitable for firing natural gas or LPG. DR-SE water heaters do not require a power supply when supplied as a basic unit, however, a power supply will be required for electrical anode protection, recirculation kit and time clock control options.Options Natural gas or LPG Time clock control kit Unvented supply kit Electrical anode protection Top to bottom recirculation kit Flexible magnesium sacrificial anodes37516 Dimensions in mm DR-SE 16 DR-SE 19 Overall height A 1585 1780 Cylinder height B 1450 1640 Cylinder diameter D 645 675 Width including gas train F 730 765 Gas connection L 375 385 Cold water inlet M 1505 1685 Hot water outlet N 1505 1685 Drain connection R 285 285 T&P valve S 1280 1460 Anode clearance H 1000 1300Standard Features Permanent pilot ignition Single tube heat exchanger Control thermostat range 40°C to 81°C Magnesium sacrificial anodes Inspection door Combustion products discharge safety device Draught diverter Model DR-SE 16 DR-SE 19 Continuous output with 44°C ?t (80°F) l/h 370 393 UK gal/h 81 86 Storage capacity litres 278 372 UK gal 61 82 Time to recover storage 44°C ?t (80°F) mins 55 60 Heater output kW 18.9 20.1 Maximum water pressure bar 8 (open vented) Psig 116 Gas input rate m3/h 2.4 2.5 natural gas (G20) ft3/h 84.7 88.3 Propane input gas rate at 37m bar m3/h 1.0 1.1 (14.85 In wg) standard inlet pressure ft3/h 35.3 38.8 Water flow and inlet connection in 1” NPT 11/4” NPT Gas connections in 1/2” Rp Drain connection (hose connection) & Recirculation connection in 3/4” - NPT Draught diverter spigot ID mm 130 in 5 17Dorchester DR-PF RangePower Flame, Gas or OilDirect Fired Water HeatersThe DR-PF range is designed to meet the latest HSC requirements for the control of Legionellosis. The large inspection door provides access for servicing and suitable tappings are included to facilitate top to bottom recirculation.The water heater is supplied complete with a matched Riello burner and pre-wired control panel with on/off switch, temperature thermostat, power indicator, reset button, powered lockout and run indication connection.The DR-PF is suitable for use on open vented or unvented systems. An optional unvented supply kit contains all of the additional parts required to satisfy the Water Supply (water fittings) Regulations 1999.In plant rooms with insufficient headroom clearance for fixed anodes, flexible magnesium sacrificial anodes may be specified as an option.The Dorchester DR-PF range of power flame water heaters is suitable for the larger load requirements for hot water and consists of 6 models with continuous outputs ranging from 969 to 3241 litres/hour, based on a 44°C temperature rise. Storage capacities range from 271 to 338 litres. Two or more water heaters can be installed in a modular configuration where there is demand for even larger loads.The DR-PF is fitted with a power flame burner with fully automatic ignition. The water heaters are suitable for firing natural gas, LPG or oil and a Riello gas or oil burner is supplied as standard. The range is particularly suited to installations where a shared flue with other power flame plant is preferred, or in installations where oil fired water heating is required.Options Natural gas, LPG or Oil fired burner Unvented supply kit Electrical anode protection Top to bottom recirculation kit Flexible magnesium sacrificial anodes18Standard Features Riello burner Fully automatic ignition Multi-tube heat exchanger Control thermostat range 40°C to 80°C Magnesium sacrificial anodes Powered lockout & run indication connection Inspection door* After fitting flue reducer Model - Natural gas fired water heaters DR-PF 55 DR-PF 65 DR-PF 75 DR-PF 95 DR-PF 115 DR-PF 145 Continuous output with 44°C ?t (80°F) l/h 969 1210 1452 1855 2177 2821 UK gal/h 213 266 319 408 479 621 Storage capacity litres 338 338 333 296 296 271 UK gal 74 74 73 65 65 60 Time to recover storage 44°C ?t (80°F) mins 19 15 12 8 7 5 Heater output kW 49.5 61.8 74.2 94.8 111.2 144.1 Gas input rate m3/h 6.4 7.9 9.5 12.2 14.3 18.5 natural gas (G20) ft3/h 226 279 335 431 505 653 Gas connections in 3/4”Rp 11/4 Rp Common data Model DR-PF 55 DR-PF 65 DR-PF 75 DR-PF 95 DR-PF 115 DR-PF 145 Maximum water pressure bar 8 (open vented) psig 116 Water outlet & inlet connection in 11/2“ Rp Drain & recirculation connection in 3/4"NPT Flue Connection mm 150 200 250 in 6 8 10 Electrical supply 230v 50Hz 1Ph Dimensions in mm DR-PF 55 DR-PF 65 DR-PF 75 DR-PF 95 DR-PF 115 DR-PF 145 Overall height A 1900 2025 Cold water inlet B 685 640 765 Drain connection C 585 605 746 Flue spigot E 150* 200 250* T&P valve F 1700 1630 1770 Hot water outlet G 1720 1650 1785 Burner width H Oil 575 601 Gas 625 653 Width including burner J Oil 255 300 Gas 255 300 Model - Oil fired water heaters DR-PF 55 DR-PF 65 DR-PF 75 DR-PF 95 DR-PF 115 DR-PF 145 Continuous output with 44°C ?t (80°F) l/h 1012 1214 1417 1823 2225 3241 UK gal/h 222 267 312 401 489 713 Storage capacity litres 338 338 333 296 296 271 UK gal 74 74 73 65 65 60 Time to recover storage 44°C ?t (80°F) mins 20 16 13 9 8 5 Heater output kW 51.7 62.1 72.4 93.2 113.7 165.6 Oil input rate l/h 6.4 7.6 8.9 11.4 14.0 20.4 35 second UK gal/h 1.4 1.7 1.9 2.5 3.1 4.51920Room Sealed & Open Flue SystemsDorchester DR-RS & DR-FC Evo RangesPD CR 1749:2001This document provides guidance on the classification of appliances, depending on the product characteristics. Extracts for guidance:Room SealedType C - An appliance in which the combustion circuit (air supply, combustion chamber, heat exchanger and evacuation of the products of combustion) is sealed with respect to the room in which the appliance is installed.Type C1 - A type C appliance that is designed for connection via its ducts to a horizontal terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either concentric or close enough to come under similar wind conditions.Type C3 - A type C appliance that is designed for connection via its ducts to a vertical terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either concentric or close enough to come under similar wind conditions.Type C5 - A type C appliance connected to separate ducts for the supply of combustion air and the evacuation of the products of combustion. These ducts may terminate in zones of different pressure.Type C13 - A type C1 appliance incorporating a fan upstream of the combustion chamber/heat exchanger.Type C33 - A type C3 appliance incorporating a fan upstream of the combustion chamber/heat exchanger.Type C53 - A type C5 appliance incorporating a fan upstream of the combustion chamber/heat exchanger.Open FlueType B - An appliance intended to be connected to a flue that evacuates the products of combustion to the outside of the room containing the appliance. The combustion air is drawn directly from the room.Type B2 - A type B appliance without a draught diverter.Type B23 - A type B2 appliance incorporating a fan upstream of the combustion chamber/heat exchanger.For details of the full range of classifications refer to BSI publication PD CR 1749:2001.The Dorchester DR-RS and DR-FC Evo water heaters are designed to operate as room sealed appliances and are available with a choice of fluing options using a range of matched components.Alternatively the Dorchester DR-FC Evo water heaters can be used with open flue systems.The matched range comprises balanced flue type components that can be used in a variety of balanced flue, room sealed or open flue configurations.Available in concentric, twin duct arrangements, or single pipe arrangements the flue components provide versatility in where the main appliance can be located. Balanced flue arrangements can reduce the cost of installation and simplify flue runs. The room sealed configurations reduce the volume of ventilation air required, resulting in tighter, and more energy efficient buildings. Open flue applications using DR-FC Evo water heaters provide solutions where balanced flue terminals are unsuitable, or where existing flue routes are to be retained.A simple push fit connection with a silicone seal ensures water and pressure tight joints every time and clamp bands complete the installation. The flue is constructed from aluminium for twin duct and open flue arrangements(single wall) and this forms the inner wall of concentric flue components. The outer wall of concentric flue components is constructed from galvanised steel, with the concentric ring carrying the combustion air to the appliance, which also acts as the insulation to the inner duct, which carries the exhaust flue gases.The flue range can be selected for Dorchester DR-RS and DR-FC Evo water heaters in the following configurations, in accordance with the European scheme for the classification of gas appliances, according to the method of evacuation of the products of combustion (types) - published document (BSI) PD CR 1749:2001DR-RS & DR-FC Evo Models Type C13 Concentric duct, horizontal discharge Type C33 Concentric duct, vertical dischargeDR-FC Evo Models Type C53 Twin duct, horizontal air supply, vertical discharge Type B23 Single pipe open flue, vertical dischargeIt is possible to arrange flues in other configurations. Please consult our technical team for further details. Telephone: 01202 662379DR-RS 25/40/65Flue Type C33DR-RS 25/40/65Flue Type C13DR-RS 85/105Flue Type C33DR-RS 85/105Flue Type C13Flues can be arranged for horizontal or vertical discharge through concentric terminals. The maximum flue run is 7m, using a maximum of two 90 degree or 45 degree bends. Horizontal flue runs must be installed to allow for condensate drainage from the flue.The DR-RS 25, DR-RS 40 and DR-RS 65 models use concentric flue components throughout.The DR-RS 85 and DR-RS 105 use concentric terminals, but twin duct components are used from the appliance to the terminal.Room Sealed Flue SystemsDorchester DR-RS Range2122Dorchester DR-FC Evo RangeRoom Sealed & Open Flue SystemsConcentric, room sealed flue systems type C13 & C33The Dorchester DR-FC Evo can be flued with horizontal or vertical discharge through concentric terminals.Ducting from heater to terminal can be made using concentric tubes. Table 1 provides details of the maximum length of flue and the permitted number of bends within an individual flue system. Where longer flue routes are required it is possible to use individual air supply and flue ducts from the heater converging at the concentric terminal, reducing the flue system resistance permitting the extended length. Table 2 provides details of the maximum flue length and equivalent bend lengths. If still longer flue lengths are required then it is possible to increase the size for the air supply and flue ducts between the heater and the terminal. The final connection sizes at the heater and concentric terminal remain the same, so expansion and reduction pieces are used to facilitate the size change at each end of both the air supply and flue pipe. Table 3 provides details of the maximum flue length and equivalent bend lengths. Table 1 - Concentric flue systems - room sealed application onlyC13 & C33 Type fluesTable 2 - Twin pipe flue systems converging into concentric terminalC13 & C33 Type flues. Concentric terminal diameter as Table 1Table 3 - Enlarged twin pipe flue systems converging into concentric terminal - C13 & C33 Type flues. Concentric terminal diameter as Table 1Flue Type C13 Flue Type C33Model Diameter Max length Max no. 45° or 90° bendsDR-FC Evo 25 100/150mm 40m 7DR-FC Evo 30 100/150mm 40m 7DR-FC Evo 45 100/150mm 40m 7DR-FC Evo 60 100/150mm 40m 4DR-FC Evo 80 130/200mm 15m 4DR-FC Evo 95 130/200mm 15m 4DR-FC Evo 120 130/200mm 15m 4Model Diameter Max length Equivalent length 90° bendEquivalent length 45° bendDR-FC Evo 25 100mm 55m 4.6 1.2DR-FC Evo 30 100mm 55m 4.6 1.2DR-FC Evo 45 100mm 55m 4.6 1.2DR-FC Evo 60 100mm 55m 4.6 1.2DR-FC Evo 80 130mm 65m 2.4 1.4DR-FC Evo 95 130mm 65m 2.4 1.4DR-FC Evo 120 130mm 65m 2.4 1.4Model Diameter Max length Equivalent length 90° bendEquivalent length 45° bendDR-FC Evo 25 130mm 100m 2.4 1.4DR-FC Evo 30 130mm 100m 2.4 1.4DR-FC Evo 45 130mm 100m 2.4 1.4DR-FC Evo 60 130mm 100m 2.4 1.4DR-FC Evo 80 150mm 100m 2.6 1.6DR-FC Evo 95 150mm 100m 2.6 1.6DR-FC Evo 120 150mm 100m 2.6 1.6Room Sealed & Open Flue SystemsTwin pipe, room sealed flue systems type C53Dorchester DR-FC Evo room sealed flues can be arranged for horizontal air supply and vertical flue discharge Ducting between the heater and air/flue terminals is made using single tubes. Table 4 provides details of the maximum flue length and equivalent bend lengths. Where longer flue routes are required then it is possible to increase the size for the air supply and flue ducts between the heater and the air/flue terminals. The final connection sizes at the heater and terminals remain the same, so expansion and reduction pieces are used to facilitate the size change at each end of both the air supply and flue pipe. Table 5 provides details of the maximum flue length and equivalent bend lengths. Table 4 - Twin pipe flue systems and open flue systemsC53 & B23 Type fluesTable 5 - Enlarged twin pipe flue systems and open flue sytems C53 & B23 Type fluesOpen Flue Systems Type B23An Open flue system can be installed with vertical flue discharge. Ducting between the heater and flue terminal is made using single tubes. Table 4 provides details of the maximum flue lengths and equivalent bend lengths. Where longer flue routes are required then it is possible to increase the size for the flue duct between the heater and the flue terminal. The final connection sizes at the heater and terminal remain the same, so expansion and reduction pieces are used to facilitate the size change at each end of the flue pipe. Table 5 provides details of the maximum flue length and equivalent bend lengths. 23Dorchester DR-FC Evo RangeFlue Type C53Flue Type B23Model Diameter Max length Equivalent length 90° bendEquivalent length 45° bendDR-FC Evo 25 100mm 55m 4.6 1.2DR-FC Evo 30 100mm 55m 4.6 1.2DR-FC Evo 45 100mm 55m 4.6 1.2DR-FC Evo 60 100mm 55m 4.6 1.2DR-FC Evo 80 130mm 65m 2.4 1.4DR-FC Evo 95 130mm 65m 2.4 1.4DR-FC Evo 120 130mm 65m 2.4 1.4Model Diameter Max length Equivalent length 90° bendEquivalent length 45° bendDR-FC Evo 25 130mm 100m 2.4 1.4DR-FC Evo 30 130mm 100m 2.4 1.4DR-FC Evo 45 130mm 100m 2.4 1.4DR-FC Evo 60 130mm 100m 2.4 1.4DR-FC Evo 80 150mm 100m 2.6 1.6DR-FC Evo 95 150mm 100m 2.6 1.6DR-FC Evo 120 150mm 100m 2.6 1.6Warmwell Customer Service CentreHamworthy Heating Limited Fleets Corner, Poole, Dorset BH17 0HH Telephone: 0845 450 2865Email: sales@hamworthy-heating.comWeb: www.hamworthy-heating.comHamworthy reserves the right to make changes and improvements which may necessitate alteration to the specification without prior notice.500002371 GHamworthy Heating AccreditationsISO 9001 Quality Management SystemISO 14001 Environmental Management SystemOHSAS 18001 Health & Safety Management SystemThe printed version of this brochure is produced using environmentally friendly print solutions in partnership with our suppliers