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DORCHESTER DR-SE 18 Installation, Commissioning And Maintenance Instructions

Hot water storage heaters
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DORCHESTER
DR-SE 18 & DR-SE 20 P/P
HOT WATER
STORAGE HEATERS
Installation, Commissioning
and Maintenance Instructions
(Minisit 710 gas control valve)
Heaters with serial numbers from 80000000
IMPORTANT NOTE
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
SERVICING EQUIPMENT

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  • Page 1 DORCHESTER DR-SE 18 & DR-SE 20 P/P HOT WATER STORAGE HEATERS Installation, Commissioning and Maintenance Instructions (Minisit 710 gas control valve) Heaters with serial numbers from 80000000 IMPORTANT NOTE THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR...
  • 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 DORCHESTER DR-SE 18 & DR-SE 20 P/P HOT WATER STORAGE HEATERS Installation, Commissioning and Maintenance Instructions (Minisit 710 gas control valve) Heaters with serial numbers from 80000000 NOTE: THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT.
  • Page 4 8.0 AIR FOR COMBUSTION AND VENTILATION 9.0 WATER PIPEWORK INSTALLATION 10.0 GAS PIPEWORK INSTALLATION 11.0 CONTROL SYSTEM 12.0 COMMISSIONING 12.1 System Checks 12.2 Heater Checks 12.3 Procedure for Initial Lighting and Adjustment 12.4 Combustion Check 12.5 Normal Operation Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 5: Table Of Contents

    Table 2 Exhaust Gas Data Table 3 General Air Requirements Table 4 Air Supply Openings per Heater Table 5 Control Valve Temperature Settings APPENDIX 1 - LPG MODELS APPENDIX 2 - UNVENTED SYSTEMS Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 6: Introduction And Delivery 1

    DR-SE 18 P/P and DR-SE 20 P/P. Each pressure/temperature relief valve, to enable the heater unit fired atmospheric burner to be coupled directly to the mains water. For details incorporating a permanent pilot and controlled by a see Appendix 2 (publication No.

  • Page 7: Heater

    R½ ½ in BSP external taper Manual gas valve 2 x Rc½ 2 x ½ in BSP internal c/w union Draught diverter spigot ID 131 mm Nominal bore of flue outlet 127 mm Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 8: Technical Data 2

    Table 1. Technical Data MODEL DR-SE 18 DR-SE 20 Input (Gross) 22.2 kW 25.5 kW Input (Net) 20.0 kW 23.0 kW Output 18.0 kW 20.0 kW Weight (filled) 470 kg 600 kg Maximum water pressure 6 bar 6 bar Nominal gas inlet pressure (G20)
  • Page 9 Exhaust Gas Exhaust Gas Volume before Draught at N.P.T Diverter °C DR-SE 18 31.4 DR-SE 20 36.1 8.0 AIR FOR COMBUSTION AND VENTILATION Note 4: Heaters installed in a living space must be fitted with a combustion products discharge safety...
  • Page 10 270cm² plus 2.25cm² per kW in excess of 60 kW total rated input. Table 4 - Air Supply Openings per Heater Model Position of Opening Free Area cm² DR-SE 18 Low Level High Level DR-SE 20 Low Level High Level 9.0 WATER PIPEWORK INSTALLATION...

  • Page 11: Ga Supply

    If heater is controlled by a time clock or addi- 80°C. Should the device operate, the heater is im- tional electrical interlock, an electrically oper- mediately shut down, gas to both pilot and main ated solenoid valve will be positioned in the Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 12: Meters

    To shut down heater for short periods only: turn the gas control knob to “ ” position (pilot only - pilot re- Turn control knob back to “pilot only ”, remove mains alight). manometer and tighten test point screw. Return Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 13: Removal Of Burner Assembly

    (if fitted) (Time Clock diverter and flue. and Flame Failure Alarm options only). Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 14: Assembly Following Servicing

    Spark Electrode c/w Lead 333805318 top of the anode to ensure good electrical contact to Main Injector 3.5mm the tank. Also check cleanliness of bonding connec- (DR-SE 18 - Nat. Gas) 330513691 tion at the tank. Main Injector 3.8mm (DR-SE - Nat. Gas)

  • Page 15: Commissioning 6

    15.2.5 Fault Finding ends of tube into either side of tee and tighten. Lo- cate support bracket against right hand edge of the Should the alarm operate - check for possible faults as follows: Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...

  • Page 16: 15.3 Top To Bottom Circulation

    A top to bottom circulation kit can be supplied for tion on top of the heater with the compression fitting both heaters - DR-SE 18 HHL Part No. 563605053, directly away from the heater. DR-SE 20 HHL Part No. 563605054. The kit is nor-...

  • Page 17: Servicing

    Tighten securing nut and replace cover knob. In an alarm is required, it is suggested that a flame Connect the loose end of the bridging cable to termi- failure alarm kit is added (see Section 2.2.4 and Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 18 Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 19 Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 20 Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 21 Gas valve setting scale Pressure regulator cover screw Temperature sensing phial Input pressure test point Thermocouple Burner feed pipe Pilot burner feed pipe Injector Burner mounting bracket Overheat safety device (limit ‘stat) Pilot button Stop button Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 22 Pressure adjustment screw Pilot adjustment screw Fig 5a Gas Control Valve Adjustments Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 23 APPENDIX 1 INSTALLATION, COMMISSIONING AND MAINTENANCE MANUAL DR-SE 18 P/P & DR-SE 20 P/P DORCHESTER RANGE OF HOT WATER STORAGE HEATERS FOR DOMESTIC HOT WATER (PERMANENT PILOT IGNITION) FIRING LPG (PROPANE OR BUTANE) TO BE USED IN CONJUCTION WITH THE MAIN INSTALLERS GUIDE PUBLICATION NO. 500001062...
  • Page 24 Main Injectors 2.3 mm the literature and on the data plate. The size of (DR-SE 18 LPG) 532902034 the injector can be found stamped on the brass injector itself.
  • Page 25 FOR ALL OTHER INFORMATION SEE On DRSE (UV) heaters the 3/4" BSP Nabic APPENDIX 3 FOR DR35-90L (UV) Part No temperature and pressure relief valve is 500001004- fitted in the 1" BSP socket (6), ref Figure 1, Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 26 Page HAMWORTHY HEATING LTD DORCHESTER DR-SE 500001062/D...
  • Page 27 Notes...
  • Page 28 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 •...

This manual is also suitable for:

Dr-se 20

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