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DORCHESTER DR-SA Series Installation, Commissioning And Servicing Instructions

Range of hot water storage heaters natural gas i2h lpg i3+ open flue, direct gas fired hot water storage heaters with automatic ignition for domestic hot water installations
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Dorchester DR-SA Range
of Hot Water Storage Heaters
Open Flue, Direct Gas Fired Hot Water
Storage Heaters with Automatic Ignition
for Domestic Hot Water Installations
Installation, Commissioning
and Servicing Instructions
DORCHESTER DR-SA 16, 19 MODELS
NATURAL GAS I
LPG I
2H
3+
NOTE: THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR SERVICING EQUIPMENT.
THIS WATER HEATER IS FOR USE ON GROUP H NATURAL GAS (2
FAMILY) I
OR
2H
ND
LPG (3
FAMILY) I
. PLEASE ENSURE RELEVANT INFORMATION REQUIRED WITHIN
3+
RD
DOCUMENT IS FOUND RELATING TO SPECIFIC GAS TO BE FIRED BEFORE FIRING
HEATER.
THIS WATER HEATER COMPLIES WITH ALL RELEVANT EUROPEAN DIRECTIVES.
PUBLICATION NO. 500001135
ISSUE 'F'
APRIL 2012

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Summary of Contents for DORCHESTER DR-SA Series

  • Page 1 Storage Heaters with Automatic Ignition for Domestic Hot Water Installations Installation, Commissioning and Servicing Instructions DORCHESTER DR-SA 16, 19 MODELS NATURAL GAS I LPG I NOTE: THESE INSTRUCTIONS MUST BE READ AND UNDERSTOOD BEFORE INSTALLING, COMMISSIONING, OPERATING OR SERVICING EQUIPMENT.

  • Page 3: Table Of Contents

    Sacrificial anode ..............................14 2.7.2 Cleaning ................................14 2.7.3 Inspection of the internal waterside surfaces .......................14 2.7.4 Spare parts................................15 Condensation ...............................15 Important warning ..............................15 FOR THE USER Instructions for use ...............................15 Fault finding................................16 APPENDIX 1 ....................................17 Connection diagram Dorchester DR-SA 16 & 19 ........................17...

  • Page 4: General

    GENERAL 1.1.2 Options The Dorchester DR-SA heaters can be supplied with Description additional variations, either ready fitted or for on-site assembly. Construction of the Dorchester DR-SA heaters is in accordance with the European standards for gas fired a) LPG – The heaters can be supplied adjusted for use on propane or butane –...
  • Page 5 AOS 1120 Figure 1 - Cross-section of the heater Draught diverter 10) Cold-water inlet (c/w inlet tube) Hot water outlet 11) Combustion products discharge safety device. Insulation 12) T&P valve connection Flue tube 13) Outer casing 14) Flue baffle Glass lined tank 15) Magnesium anode Gas control valve 16) Drain valve and secondary return connection...

  • Page 6: Technical Description

    Technical description 1.2.3 Operation of the water heater Normal operation 1.2.1 Gas control valve When there is a demand for heat a waiting period The water heater is equipped with a gas control valve c/w burner control that regulates the flow of gas to the of about 1 second elapses before the built-in spark generator and pilot gas valve are switched on.

  • Page 7: Combustion Products Discharge Safety Device

    1.2.4 Combustion products discharge safety device The heater has been fitted with a combustion products discharge safety device. It is the function of the safety device to prevent flue gases from the water heater entering the room where the water heater has been placed, instead of passing through the flue to outside atmosphere.

  • Page 8: Technical Data

    1.3.2 Technical data Device category II2H3+ Description Unit DR-SA 16 DR-SA 19 DATA G20 – 20 mbar: Nominal output 18.9 20.1 Nominal load (gross) 24.7 26.2 Supply pressure (G20) mbar Burner pressure (G20) mbar 12.0 Gas consumption (G20)* Diameter main orifice (G20) 3.90 4.50 Diameter pilot orifice (G20)

  • Page 9: For The Installer

    2.1.1 Regulations and Related Documents Electrical connenction Gas Safety Installations and Use Regulations 1998, (as amended). It is law that competent persons, in accordance with the above regulations install all gas Electrical supply Frequency Fuse appliances. Failure to install appliances correctly could 230 V AC 50 Hz lead to prosecution.

  • Page 10: Water Circulation System

    4. The actual orientation of the tee may depend on whether a system return is required and whether a top to Dorchester water heaters are suitable for connection to bottom circulator kit is to be fitted. vented, un-vented and pumped pressurised systems.
  • Page 11 Un-vented system (see figure 6) To install a Dorchester water heater on an un-vented cold water supply system a kit of valves and fittings (WRAS approved) must be used. Installation must be carried out generally as shown on figure 6.

  • Page 12: Gas Connection

    2.1.3 Gas connection 2.1.6 Electrical connection The gas supply to this appliance must be installed in An accredited electrical installation company must carry accordance with BS 6891 and IGE/ UP/1,1A and 2. out all electrical connections in accordance with IEE Fit the 1/2”...

  • Page 13: Removing And Replacing The Control Panel

    Removing and replacing the control Setting the gas pressure panel front cover The gas pressure has been set to the correct value at the Removing the cover (see figure 7) factory but it must be checked again at commissioning 1. Remove the screw at the top centre of the control and during the once a year and every year maintenance panel.

  • Page 14: Temperature Regulation

    Temperature regulation 2.7.1 Sacrificial anode Note: On no account remove the magnesium anode without checking to make sure that the heater is fully With the system operational, the amount of cold water that isolated and the pressure removed. is added is equal to the amount of hot water used. The gas 1.

  • Page 15: Spare Parts

    Note: Do not use a metal scraper to remove deposits. 6. Make sure the manual gas shut off valve is open. 7. Switch the mains electricity supply to the heater ON. You will damage the glass lining. Set the on/off switch on the heater to ON (1) and After cleaning, replace the clean out door with new gasket if required.

  • Page 16: Fault Finding

    Fault finding Fault Possible Cause Corrective Action Heater is off or does Control thermostat satisfied None – heater will light up when not ignite hot water temperature drops. No electrical power Make sure electrical supply is turned on at local isolator and heater on/off switch.

  • Page 17: Connection Diagram Dorchester Dr-Sa 16 & 19

    APPENDIX 1 Connection diagram Dorchester DR-SA 16 & 19 = brown Ignition controller = Terminal block ON/OFF switch = Terminal block = blue Pilot burner = Earth terminals = yellow/green Spark electrode = Connector to ignition controller Flame probe = Gas control valve...
  • Page 18 0308 236 R3...

This manual is also suitable for:

Dr-sa 19Dr-sa 16

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