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Summary of Contents for Hamworthy Weymouth Series
- Page 1 Weymouth Series Pressurisation Units Installation, Commissioning and Servicing Instructions Weymouth Standard & Advanced Models IMPORTANT NOTE THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT...
- Page 2 01202 662555 Hamworthy offer a service of site assembly for many of our products in instances where plant room area is restricted. Using our trained staff we offer a higher quality of build and assurance of a boiler built and tested by the manufacturer.
- Page 3 Weymouth Series Pressurisation Units Installation, Commissioning and Servicing Instructions Weymouth Standard & Advanced Models NOTE: THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT. THE WEYMOUTH PRESSURISATION UNITS ARE INTENDED FOR USE ONLY IN COMMERCIAL/LIGHT INDUSTRIAL APPLICATIONS.
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Page 4: Table Of Contents
Expansion Vessels ..........................5 Safety Relief Valve ..........................5 INSTALLATION ..........................6 Location .............................. 6 Pipework Connections ........................6 Electrical Connection .......................... 7 6.3.1 Mains Connection ..........................7 6.3.2 Safety Switches/Circuits On Advanced Only ..................7 HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... - Page 5 6 Monthly ............................13 12 Monthly ............................13 4 Yearly ............................13 10.0 SERVICING AND REPLACEMENT OF COMPONENTS ............... 14 10.1 Hamworthy Heating Recommended Spares ..................14 10.2 Standard Pump Removal ......................... 14 10.3 Advanced Pump Removal ........................ 15 10.3.1 Pump Fitting On Both Units ......................
- Page 6 Figure 4 Expansion Vessel Operation ......................3 Figure 5 Schematic Layout of the Standard and Advanced Units ..............4 Figure 6 Hamworthy Heating Expansion Vessels ..................... 5 Figure 7 Recommended Clearance Dimensions ....................6 Figure 8 Mounting Bracket Dimension ......................6 Figure 9 Pipework Dimensions .........................
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Page 7: Introduction
1.0 INTRODUCTION The pressurisation units in the Hamworthy Weymouth range are designed to maintain the minimum pressure requirement of modern low/medium temperature, hot water sealed systems. The pressurisation units also provide replacement water for losses from the systems. Note! The pressurisation unit is not to be used for the initial filling of the system. -
Page 8: Sealed System Function
Expansion Vessel Charge Pressure The gas pressure in the expansion vessel with water connection open to atmosphere System Cold Fill Pressure The water pressure in the system that the pressurisation unit is set to maintain HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 9: Application
3. Diaphragm position at high system pressure. The boiler system is shut down by the system pressure switch on Advanced Unit. 4. Diaphragm at the safety valve lift pressure. Caused by boiler temperature limiter failure for example. Acceptance factor = 0.5 maximum (recommended). HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 10: Operation Of The Pressurisation Unit
BS 6759 Part 1 (ISO 4126): Specification for safety valves for steam and hot water. BS 3456 (CEE10 Part 1, CEE11 Part 1): Safety of Household and similar electrical appliances. HSE Guidance note PM5: Automatically controlled steam and hot water boilers. HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 11: Mains Water Connections
5.3.1, otherwise if in any doubt contact Hamworthy Heating Limited for comprehensive system sizing information. Hamworthy Heating Ltd supply a range of suitable expansion vessels details are shown below. A calculation sheet which can be used to determine a suitable volume for an expansion vessel can be found in the Appendix. -
Page 12: Installation
The antigravity loop must not be lagged but can be fitted with an optional kit to prevent freezing. Consult Hamworthy Heating for details. The pipe-work and fittings must be pressure tested to 1.5 times the safety valve lift pressure. -
Page 13: Electrical Connection
The circuits are rated at 230 V ~50 Hz, 15A. NOTE if the factory set pressure switch levels are to be altered terminal should not be connected at this stage. The connection terminal and its location is shown in fig 10. Figure 10 Advanced Alarm Terminal HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 14: Commissioning
Check the integrity of the pipe-work. Ensure the lock-shield valve between the Weymouth unit and the expansion vessel is open and the drain valve is closed. Ensure the air purge plug is fitted (near the top of the expansion vessel). HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 15: Initial Setting Of Both Standard And Advanced Units
2 as are the Hi and Lo pressure switches. If these levels are unsuitable for the installation then adjustment instructions are given in section 7.3. 7) Set the float to its lowest level. (fig 14) Figure 14a. Float Adjustment Standard Figure 14b. Float Adjustment Advanced HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 16: Filling The Unit
3.4 bar then the switch will operate when the pressure rises to 3.4 bar causing the pump to stop. The switch will not change over & start the pump until the pressure has fallen back to 3.0 bar. HAMWORTHY HEATING LTD WEYMOUTH... -
Page 17: Pressure Switch Adjustment Apparatus
4) The terminals at either end of the switch form an open circuit. Adjust the until the circuit is closed. A meter across the terminals will signal a change. If needed figure 25 shows the wire colours of the switches. HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 18: Fault Finding
8.0 FAULT FINDING General fault finding is shown in Figure 18. If the Weymouth unit still does not operate satisfactorily, consult Hamworthy Heating for assistance. Figure 18. Fault Finding Guide. Fault Possible Causes Action Pump will not run Unit up to pressure... -
Page 19: Servicing Schedule
Inspect the internal surface of the vessel for corrosion. Significant corrosion can lead to failure of the vessel; replacement of the entire vessel should be considered. If necessary replace the diaphragm as described in section 10.9. HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 20: Servicing And Replacement Of Components
The cover on the Standard unit is secured by one screw at the lower edge of the front panel and one screw on the top panel. The cover on the Advanced unit is secured by one screw at the lower edge of the front panel only. 10.1 Hamworthy Heating Recommended Spares Standard Spares... -
Page 21: Advanced Pump Removal
On the standard unit there is a black spacer which fits between the tank and the chassis. This must be refitted when a new assembly is installed. Once fitted the float adjustment should be set to the lowest level (se section 7.5) HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 22: Pressure Switches On Both Units
Undo the capillary nut holding the end into the pipe (see fig 26). Depress the tags on the opposite sides of the gauge body and push through the panel (see fig 28) Figure 28 Pressure Gauge HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... -
Page 23: Non-Return Valve On Standard Unit
Push the valve out from the brass fitting (see fig 30). 10.9 System Expansion Vessel Diaphragm (Part n° dependant on model and serial n°. Consult Hamworthy Heating for details) Turn off the boiler and electrically isolate the unit. Close the system isolating valve and isolate the mains water supply to the header tank. -
Page 24: Appendix 'A' - Diagrams, Drawings And Data
APPENDIX Contents Page Figure A1 Wiring Diagrams Figure A2 Heating System Calculation Sheet HAMWORTHY HEATING LTD WEYMOUTH 500001112/C... - Page 25 Figure A1. Wiring Diagrams HAMWORTHY HEATING LTD WEYMOUTH 500001112/C...
- Page 26 3 6. Lo Pressure Switch Setting Calculation, P = 2.05 - 0.3 = - 0.3 7. Hi Pressure Switch Setting Calculation, P si - - 0.35 = - 0.35 = 3.0 HAMWORTHY HEATING LTD WEYMOUTH 500001112/C...
- Page 27 Notes...
- Page 28 Unit 2, Antrim Line Business Park, Sentry Lane, Newtownabbey BT36 8XX tel: 02890 849826 fax: 02890 847443 Website www.hamworthy-heating.com Associate Companies, Offices and Agents throughout the World. Hamworthy reserves the right to make changes and improvements which may necessitate alteration to the specification without prior notice.