Summary of Contents for Wessex 220 M Series
- Page 1 IMPORTANT NOTE THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT...
- Page 2 Customer Services Technical Enquiries 01202 662527/662528 To supplement the detailed technical brochures, technical advice on the application and use of products in the Hamworthy Heating range is available from our technical team in Poole and our accredited agents. Site Assembly 01202 662555 Hamworthy offer a service of site assembly for many of our products in instances where plant room area is restricted.
- Page 3 NOTE: THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT. THE WESSEX 220 M BOILER IS INTENDED FOR USE AS A COMMERCIAL APPLIANCE. THIS BOILER IS FOR USE ON GROUP H NATURAL GAS (2 FAMILY) I...
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Page 4: Table Of Contents
Open Vent and Cold Feed Pipe Altitude Gauge (Water Pressure Gauge) Thermometer Drain Valves Circulating Pump Minimum Water Flow Rates Waterside Pressure Drop 8.10 Control Schemes 8.11 Unvented Systems 8.12 Modular Boiler Control Schemes HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 5 Figure 12.2 Fault Finding Procedures ........................22 Figure 12.3 Fault Finding Procedures ........................23 Figure 13.2 Diagram of Hot Surface Igniter and Flame Sensing Probe...............25 Figure 2.2 Performance & General Data Information – LPG Propane...............30 HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 7: Introduction
1.1 This boiler must be installed by a competent person assistance if in doubt. holding 'CORGI' registration equivalent. installations MUST conform to the relevant Gas Safety 1.5 The Wessex 220 M boiler is not suitable for direct Building Regulations. Health & Safety connection to domestic hot water supplies. - Page 8 Figure 1.1 Boiler Installation (Typical) HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 9 Figure 2.1 Boiler Dimensions/Clearances HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 10: Technical Data
2.0 TECHNICAL DATA Natural Gas is shown in Figure 2.2. 2.1 The Wessex 220 M boilers can be installed as single units or in modular form. Each module has an Technical data relating to propane firing can be found in independent door for access to the controls and other Appendix ‘A’. -
Page 11: General Requirements
3.3 Adequate Water Flow temperature hot water heating systems of output greater than 45 kW. The Hamworthy Wessex boiler is designed as a quick response, low water content unit, to run continuously BS EN 60335, Part 1. Safety of Household & similar with maximum reliability. -
Page 12: Time Clock Control
BS 6891 or IGE/UP/1 & IGE/UP/1A as appropriate. 3) Modular boiler installation running at 82°C flow Each Wessex 220 M module is supplied with an temperature and 11°C rise across system. Minimum individual gas pipe which exits rearwards on the right head required = 4.4 metres or 0.43 bar. -
Page 13: Flue System
The following notes are intended to give general guidance only. 6.1 Flue System General Requirements The Hamworthy Wessex 220 M series of boilers are designed to be used with natural draught flues. Flue systems should be designed in accordance with current regulations and with reference to the BS6644 &... -
Page 14: Suction
Where both low and high level openings are used, the Wessex boilers are suitable for installation in a balanced grilles shall have a total minimum free area of :- compartment in accordance with the requirements of BS 6644. -
Page 15: Air Supply By Mechanical Ventilation
3 way type such The Wessex Boiler has a low water content and the that when closed to the vent pipe the boiler will be open requirements of minimum water flow are given in to atmosphere. -
Page 16: Drain Valves
The pump should be sited to facilitate servicing. It is important to note that when Wessex boilers are used to replace boilers on an existing system, the pumps should be checked for performance against the new boiler °C... -
Page 17: Modular Boiler Control Schemes
3 phase supply. 8.12 Modular Boiler Control Schemes The method of connection to the mains electricity supply For modular installations of the Wessex 220 M range of must facilitate complete electrical isolation of the single boilers, Hamworthy Heating can supply an optional boiler/battery with a contact separation of at least 3-mm Milton fully modulating boiler sequence control system. -
Page 18: Site Wiring
Refer to Figure 8.12 for module PCB fuse rating is T250mA. It is recommended wiring connection details. that the interface module is supplied from the same mains isolator as the boiler module it is fitted to. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 19 SEQUENCER SAFETY SEQUENCER SAFETY SEQUENCER SAFETY BLR 1 ON/OFF INTERLOCK BLR 2 ON/OFF INTERLOCK BLR 3 ON/OFF INTERLOCK NOTE: VOLT FREE CONTACT CONTROLS CONTACT CONTROLS CONTACT CONTROLS CONTACT TERMINALS NOT SHOWN FOR CLARITY HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 20 NOTE: ROTARY SWITCH 'SW1' ON BOILER CONTROL PANEL MAIN PCB - POSITION '1' SETS BOILER TO REMOTE FULLY MODULATING SEQUENCED OPERATION. ROTARY SWITCH ‘SW1’ ON SEQUENCING INTERFACE MODULE PCB - POSITION ‘0’ FOR 0-10V ANALOGUE CONTROL SIGNAL OPERATION. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 21 Figure 9.1 Wiring Schematic HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 22: Boiler Assembly And Installation
3) Lift flue box into position ensuring that the flue 11.2 Gas Installation spigots locate squarely against the shoulder. Tighten the worm drive clamps until the socket lightly contacts For design see Section 5: GAS SUPPLY. the spigot. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... -
Page 23: Water Circulation System
16 position rotary switch, Note:- Refer to Figure 2.2. for Natural Gas maximum marked ‘SW1’ on the boiler control panel main PCB inlet pressure for normal operation. is set to the ‘0’ position. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 24 2.2 for correct switch setting. sequenced operation, ‘1’ – ‘9’ for Milton sequenced operation, or ‘1’ for fully modulating sequenced Switch off the boiler module(s) by pressing the push operation using an optional Sequencing Interface HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 25 AIR INLET THERMOSTAT VENTURI GAS/AIR OFFSET LIMIT ADJUSTMENT THERMOSTAT (FACTORY SET) RESET THROTTLE SCREW CO2 ADJUSTMENT (FACTORY SET) LOCKOUT RESET GAS VALVE BUTTON INLET GAS PRESSURE ELECTRICAL GLAND PLATE OFFSET ADJUSTMENT +Ve GAS TAPPING HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 26: Fault Finding
If, after pushing the reset button, the indicator on the 4) No or low gas supply pressure. fascia does not extinguish and the boiler does not fire 5) No ignition due to faulty ignition controller. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 27 Is there a control signal Check fan control wiring Continued to the fan? (24V dc across connections, replace Ref. Fig 12.2 pins 1 & 5 of 5way fan boiler main PCB control connector) Replace fan HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 28 Figure 12.2 Fault Finding Procedures. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 29 Fan Fault (Running at wrong speed or running when should be stopped) 3 Flashes Low gas supply pressure 4 Flashes Overheat (high limit thermostat tripped) Premature flame detection (Flame sensing circuit fault) 5 Flashes or Ignition control fault HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 30: Servicing
13.3.2 Should a high pressure hose not be available, 8) Remove the 2 M8 burner retaining nuts and carefully the heat exchanger will have to be removed from the HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 31 Unhook the stainless steel springs and remove Before re-assembly, if not already done, remove the the baffle plates to expose the finned tube bank. Wire heat exchanger from the boiler casing as described in HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
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Page 32: Replacement Of Failed Components
When fitting the the position of the coloured cables. replacement carefully feed the igniter through the HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E... - Page 33 Section 11.4 Commissioning The control panel and withdraw. Fit the replacement unit in reverse order. Re-light the boiler and check for correct Boiler. operation. HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 34 4 plastic PCB spacers. The module PCB is supplied mounted to a plastic housing which is not required for use on the Wessex 220 M boiler. Remove the PCB from the housing by unfastening the 4 mounting screws, and discard the housing and screws.
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Page 35: Recommended Spares
*The Sequencing Interface Module PCB is supplied mounted to a plastic housing which is not required for use on the Wessex 220 M boiler. Remove the PCB from the housing by unfastening the 4 mounting screws, and discard the housing and screws. -
Page 36: Appendix 'A' - Information Relating To Propane Firing
VENTILATED AT HIGH AND LOW LEVEL. REFER TO MAIN INSTALLER’S GUIDES. venturi gas inlet, fitted into a recess in the venturi 1.0 INTRODUCTION gas inlet flange. The operation of the Wessex 220 M range of boilers b) The nominal gas inlet pressure for propane family) I should be 37mbar. - Page 37 USEFUL USER INFORMATION INSTALLER SITE ADDRESS DATE OF COMMISSIONING: BOILER TYPE BOILER SIZE(S) UNIT NO(S). SERIAL NO(S). FLUE NOTES: HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 38 NOTES: HAMWORTHY HEATING LTD WESSEX 220 M 500001110/E...
- Page 39 Notes...
- Page 40 Connect direct Direct Dial Telephone and Fax Numbers Poole Office Hamworthy Heating Limited Fleets Corner, Poole, Dorset BH17 0HH England Main switchboard tel: 01202 662500 • boilers • controllers Technical enquiries 01202 662527/662528 01202 665111 • water heaters Spare parts 01202 662525 01202 665111 •...
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