up to Seas effic onal ie (gros ncy s) Hamworthy Purewell VariHeat High Efficiency, Fully Modulating Boilers Condensing & Non Condensing Cast Iron, Pre-mix, Modular Gas Fired Single Boiler Outputs 65kW to 180kW
High Efficiency, Condensing & Non Condensing Fully Modulating, Pre-mix Modular Gas Fired Boilers The Purewell VariHeat is the simple direct replacement for cast iron atmospheric boilers, with low emissions and durability built in as standard. All models comfortably exceed the minimum seasonal efficiency requirements for the Building Regulations (Amendment 2006), making the Purewell VariHeat the perfect choice for existing buildings and new buildings.
Specification Purewell VariHeat Natural Gas Hamworthy have designed the Purewell VariHeat to retain all the benefits of traditional boilers, but with vastly improved performance to more than meet the performance requirements for modern day boilers. Purewell VariHeat boilers can be used as single boilers, or as modules in a multiple boiler installation.
Specification Purewell VariHeat Natural Gas Primary Heat Exchanger Reduced Boiler Weight Each boiler has a cast iron primary heat exchanger arranged with horizontal sections, connected at one end only to allow expansion and contraction, retaining a proven horizontal series water flow for even hydraulic distribution. Purewell VariHeat boilers have been reduced in weight significantly, in comparison to traditional atmospheric cast iron boilers, with weights as low as 1.3 Kg/kW output.
Boiler Thermostats Pipework kits include: Purewell VariHeat boilers are fitted with a manual reset limit thermostat, which has a range of 90-110°C on all models. This will be factory set to 100°C. n Condensing boilers have an electronic control temperature range 30-90°C, whereas the high efficiency non condensing models have a range from 50-90°C. n The electronic temperature control thermostat regulates the boiler flow temperature up to a maximum setting of 90°C.
Technical Data he Models Purewell VariHeat High Efficiency Non Condensing Boilers Performance and General Data Information - Natural Gas Boiler Model PV65he PV85he PV105he PV125he (%) gross 86.97 87.34 88.10 87.00 Boiler output 82/71°C kW Btu/hr x 1000 65.0 222 85.0 290 105.0 358 125.0 426 Boiler input - (gross) - maximum kW Btu/hr x 1000 80.1 273 107.5 367 128.0 437 154.3 526 Boiler input (nett) - maximum kW Btu/hr x 1000 72.1 246 96.8 330 118.1 403 139.
Technical Data c Models Purewell VariHeat Condensing Boilers Performance and General Data Information - Natural Gas Boiler Model PV70c PV95c PV110c PV140c PV180c (%) gross 95.35 95.62 95.89 95.74 94.63 Boiler output 80/60°C kW Btu/hr x 1000 63.5 217 86.3 294 98.8 340 134.4 448 172.8 590 Boiler output 50/30°C kW Btu/hr x 1000 70 239 95 324 110 375 140 478 180 614 Boiler input - (gross) Maximum kW Btu/hr x 1000 72.2 246 98.4 336 115.0 392 151.3 516 194.
Dimensional Details he Models Purewell VariHeat High Efficiency Non Condensing Boilers Single Boilers Without Pipe Kits Dimensions in mm Flow connection Return connection A B PV65he & PV85he PV105he & PV125he 775nom 401nom 908nom 330nom # Do not run trunking or pipework accross the top of the boiler. Access is required top and front for servicing.
Dimensional Details c Models Purewell VariHeat Condensing Boilers Boilers Without Pipe Kits Dimensions in mm Flow connection PV70c, PV95c & PV110c PV140c & PV180c 651 780 A # Do not run trunking or pipework accross the top of the boiler. Access is required top and front for servicing.
Controls Overview Purewell VariHeat Purewell VariHeat boilers can be installed in a wide variety of configurations, from single boiler stand alone units to multiple boilers controlled locally or by a building management system. The controls package is extremely versatile and can be tailored to meet the exact needs of the heating system.
Control Details Purewell VariHeat Single Boiler Installations On Purewell VariHeat boilers, the control options for single boilers are different to those for multiple boilers. Options for a single Boiler only Please refer to page 12 for controls on multiple boilers. Programmable room sensor (QAA73) Outside air sensor (QAC34) 2nd Heating Circuit Clip-in relay kit (AGU2.500) DHW Cylinder Sensor Kit (QAZ21) All controls functions are managed via the ‘boiler management unit’ Siemens LMU64.
Control Details Purewell VariHeat Multiple Boiler Installations On Purewell VariHeat boilers, the control options for multiple boilers are different to those for single boilers.
Outside Air Sensor Zone Control To be used with cascade controller, the optional outside temperature sensor must be wired directly to the cascade controller to exploit the full control functionality, including weather compensation. Additional to the cascade control, multiple heating zones can be connected into the system to provide a comprehensive building control.
Multiple Boilers With Modulating Burners Optimising Life Time Performance In addition to providing system security, accurate load matching is one of the major advantages of using multiple boilers. When first introduced, modular boilers operated in a basic mode, where modules were switched on or off to meet the system demand for heat. The requirement for turndown was met by increasing or decreasing the number of modules (boilers) in an installation.
Weather Compensation Room Temperature Set Point When using an external air temperature sensor with remote enabled systems (not 0 – 10 Volt) or integral time clock, the flow temperature can be directly compensated. The heating curve corresponding to the required flow temperature conditions is fully adjustable with curve settings from 2.5 to 40.
Controls Scheme 1 Purewell VariHeat Boilers Internal Time Clock Controlled System using RVA47 Pipework and Controls Schematic for Internal Time Clock Controlled Systems RVA47 Wiring Schematic for Internal Time Clock Systems These schematics are available to download at www.hamworthy-heating.
Controls Scheme 2 Purewell VariHeat Boilers External Switched Remote Enable with RVA47 Pipework and Controls Schematic for External Switched Enable Systems RVA47 Wiring for Externally Enabled Systems These schematics are available to download at www.hamworthy-heating.
Controls Scheme 3 Purewell VariHeat Boilers External 0-10 volt Enabled System with RVA47 Pipework and Controls Schematic for External 0-10v Enabled System %KNVÄRDMRNQ RVA47 Wiring Schematic for External 0-10v Enabled Systems These schematics are available to download at www.hamworthy-heating.
Controls Scheme 4 Purewell VariHeat Boilers RVA47 Control of Primary Circuit, Time Control of Secondary Circuits using RVA46 Pipework and Controls Schematic RVA47 Wiring Schematic These schematics are available to download at www.hamworthy-heating.
Application & System Data Purewell VariHeat Boilers The installation of the boiler MUST be in accordance with the relevant requirements of the Gas Safety Regulations, Building Regulations, IEE Regulations and the bylaws of the local water undertaking. It should also be in accordance with any relevant requirements of the local gas region and local authority and the relevant recommendations of the documents below.
Water Systems Delivery Purewell VariHeat boilers are suitable for both open vented or sealed pressurised systems. Sealed systems must comply with Health and Safety Document PM5 requirements for fuel supply cut off in the event of low and high pressure conditions. To ensure compliance, consider using a proprietary pressurisation unit with correctly sized expansion vessels. Each boiler is despatched fully assembled and factory tested with the casing and control panel fitted.
System Head Guidance Note PM5 Health and Safety Executive This note states that "hot water boilers should have an automatic control apparatus to cut off fuel to the burners of gas fired plant when the water at or near the boiler flow outlet rises to a pre-determined temperature. This should provide a margin of at least 17°C below the temperature of saturated steam corresponding to the pressure at the highest point of the circulation system above the boiler.
Primary Circuit Pump Purewell VariHeat Boilers Pumps for circulation through the boilers should be sized according to the flow rate and pressure loss requirements for a boiler, or group of boilers, and associated local pipework. For details of flow rate requirements and boiler pressure loss, please refer to data tables on pages 6 and 7. Hamworthy Heating is the exclusive distributor of Biral pumps in the UK.
Wiring Diagram Purewell VariHeat Boilers The following electrical connections are provided on each module: 0DLQV 6KXQW 3XPS 3RZHUHG /RFN 2XW 1RUPDO 5XQ 6XSSO\ 2XWSXW 2XWSXW Ya +] 5HPRWH $QDORJXH 2XWVLGH 6DIHW\ LQWHUORFN /3% %XV 2Q 2II LQSXW VHQVRU OLQN LI QRW XVHG LQSXW VLJQDO 3RZHUHG 2XWSXW %06 2XWSXW 2SWLRQ 25 2SWLRQ &RQWDFWV UDWHG 9a +] 0D[ $ Electrical Connections There is a gland plate fitted to the
Wiring Diagram Cascade and Heating Zone Controls Controls Installation The RVA46 and RVA47 controls are designed for panel mounting. It is recommended that the controls are mounted with the fascia exposed externally for ease of use. Panel cut-out dimensions for RVA46 & RVA47 controllers All electrical connections use polarised coloured screwed terminal blocks to ensure that once installed and commissioned, connections are easy to relocate in their original position, if removed.
Flue System Purewell VariHeat Boilers Purewell VariHeat boilers have a pressurised flue outlet, enabling a flue installation to be designed using smaller diameter components. The following points should be noted: n n n n n n n n n n 26 A suction condition within the flue is not required, so it may be possible to achieve a lower chimney terminal height, however all installations must still comply with the requirements of the Clean Air Act 1956 Memorandum.
Flue Guide Purewell VariHeat Boilers Flue System for Individually Flued Single Boilers Only Open Flue The table below provides a guide to the maximum flue length allowed for each boiler using 100 mm diameter components on non condensing boilers. Purewell VariHeat boilers are designed for Type B23 open flue systems. Purewell VariHeat High Efficiency Non Condensing Boilers Flue Diameter (mm) Maximum Flue Length (m) 90° Elbow 45° Elbow PV 65he 100 19 1.5 1.3 PV 85he 100 12 1.5 1.
Customer Service Centre Hamworthy Heating Limited Fleets Corner, Poole, Dorset BH17 0HH Telephone: 0845 450 2865 Email: sales@hamworthy-heating.com Web: www.hamworthy-heating.com Hamworthy reserves the right to make changes and improvements which may necessitate alteration to the specification without prior notice.
