DORCHESTER DR-LA 110 User Manual Download Page 56 | Manualshive

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Instruction manual DR-LA

56

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

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Summary of Contents for DR-LA 110

Page 1: ...TURAL GAS I2H LPG I3 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 2ND FAMILY...

Page 2: ...2...

Page 3: ...2 5 2 Vented installation 14 2 5 3 Temparature and Pressure valve T P valve 14 2 6 Indicators and Alarms 14 2 6 1 Volt Free Contacts 14 2 7 Options 15 2 7 1 LPG 15 2 7 2 Unvented Supply 15 2 7 3 Top t...

Page 4: ...3 1 Draining unvented installations 40 4 3 2 Draining vented installations 41 5 Controls 43 5 1 Introduction 43 5 2 Control panel 43 5 3 Explanation of the symbols 44 5 4 ON OFF switch 44 5 5 Control...

Page 5: ...g the heater 58 9 4 Gas side maintenance 59 9 4 1 Introduction 59 9 4 2 Cleaning the burners 59 9 4 3 Cleaning the orifices 60 9 4 4 Checking the flue baffles 60 9 5 Finalising maintenance 60 A Append...

Page 6: ...6 Instruction manual DR LA gis...

Page 7: ...al injury and damage to the water heater 1 2 What to do if you smell gas Warning Whenever there is a smell of gas No naked flames No smoking Avoid causing sparks Do not use any electrical equipment or...

Page 8: ...ing 70 kW BS 5440 Installation and maintenance of flues and ventilation for gas appliances of rated input not exceeding 70 kW net 1st 2nd and 3rd family gases Part 1 Flues Part 2 Ventilation Institute...

Page 9: ...allation Based on this check the best maintenance frequency can be determined n Caution Regular maintenance extends the service life of the water heater Both the end user and the service and maintenan...

Page 10: ...use it 6 Status of the water heater gis This chapter describes each status state that the water heater may be in and how to respond if necessary 7 Starting up and shutting down gis This chapter descri...

Page 11: ...R LA 11 gis 2 Functioning of the water heater 2 1 Introduction Topics covered in this chapter Functional description of the water heater The water heater s heating cycle Protection for the water heate...

Page 12: ...as is injected into the bar burners the primary air required for combustion is also drawn in 1 Additional air is drawn through the openings in the burner tray The Legend a flue gas discharge b draught...

Page 13: ...ignited by the hot surface igniter z and the water becomes heated A soon as Twater exceeds Tset the thermostat will open once more The heat demand will cease and the burner control will stop the heat...

Page 14: ...ter A non return valve prevents excessive pressure in the water supply system This valve also prevents water from flowing backwards from the heater into the cold water supply system The pressure reduc...

Page 15: ...ure reducing valve non return valve expansion vessel expansion relief valve and pressure temperature relief valve to enable the heater to be coupled directly to the mains water For details see 2 5 1 2...

Page 16: ...Functioning of the water heater 16 Instruction manual DR LA 2 gis...

Page 17: ...ssure and burner pressure Conversion to a different gas category n Caution Starting up the water heater is described in chapter 7 Starting up and shutting down 3 2 Packaging To avoid damaging the wate...

Page 18: ...ater it is recommended that the following clearances are observed see Figure 3 2 AA around the water heater s control column and cleaning openings 100 cm BB around the water heater itself 50 cm Above...

Page 19: ...kage from the it and or connections can cause damage to the immediate environment or floors below the level of the boiler room If this is the case then the water heater should be installed above a was...

Page 20: ...ns The water heater is supplied without accessories Check the dimensions and other specifications for the accessories to be used based on Figure 3 2 and Tabel 3 5 Figure 3 2 Plan and elevation of the...

Page 21: ...ning opening centre mm 770 770 770 770 780 855 855 R Height of the drain valve centre mm 500 500 500 500 520 595 595 S Height of the T P plug centre mm 1550 1755 1550 1755 1585 1660 1660 1 Cold water...

Page 22: ...DR LA 3 is Electrical power consumption W 30 60 Supply voltage VAC 230 15 10 Mains frequency Hz 50 1 Hz Table 3 4 General and electrical data Continued DESCRIPTION Unit DR LA 30 DR LA 40 DR LA 45 DR...

Page 23: ...king plate 2 Burner pressure regulator 3 High Low control 1 2 or 3 1 1 1 1 1 1 3 Nominal load gross kW 40 9 54 2 66 9 79 2 94 3 121 2 135 7 Nominal output kW 32 0 42 0 51 8 61 4 73 1 93 9 106 4 Burner...

Page 24: ...ea non return valve f circulation pump optional g drain valve h manual gas valve mandatory i stop valve mandatory j temperature gauge recommended k top to bottom recirculation pump optional l draught...

Page 25: ...side See b in Figure 3 3 n Caution Insulating long hot water pipes prevents unnecessary energy loss 1 Optional fit a temperature gauge j to be able to check the temperature of the tap water 2 Fit the...

Page 26: ...ck the temperature of the tap water 3 Fit a stop valve i in the hot water outlet pipe for use when servicing 4 If a circulation pipe is to be fitted then refer to paragraph 3 7 4 3 7 4 Circulation pip...

Page 27: ...t and sensor that are supplied must be fitted in the draught diverter 3 9 2 Fitting the draught diverter The draught diverter can be positioned according to preference After positioning the draught di...

Page 28: ...n area where this is permitted for this category of water heater 3 9 3 Flue gas thermostat assembly Attached to the control column is a plastic bag containing the flue gas thermostat with sensor and r...

Page 29: ...m the mains to the phase of the water heater and the neutral N of the mains to the neutral of the water heater There should also be no potential difference present between neutral N and earth A If thi...

Page 30: ...to the mains voltage by means of a permanent electrical connection A double pole isolator with contacts gaps of at least 3 mm must be fitted local to the water heater The power cable must have cores o...

Page 31: ...g up for the first time and following conversion you must always check the supply pressure and burner pressure If necessary adjust these to be certain of optimum performance of the water heater cNote...

Page 32: ...the manifold test nipple h n Caution All gas pipes should be bleeded and free of leakage 4 Connect a pressure gauge to test nipple 5 Open the gas supply 6 Switch on the power to the water heater usin...

Page 33: ...om Tabel 3 5 15 If the pressure reading is not correct repeat steps 13 and 14 until the correct pressure is attained 16 Fit the cap b on the burner pressure regulator 17 Shut down the water heater by...

Page 34: ...ield the condensation tray can be temporarily loosened to simplify assembly of the burner 6 Remove the burners one by one from their brackets at the front To do this you first move them away from you...

Page 35: ...regulator need to be replaced Unscrew the connector e from the gas control Either remove the blank plate f or burner pressure regulator d Either fit the blank plate or burner pressure regulator suppl...

Page 36: ...as to natural gas 1 Perform steps 1 through 9 of paragraph 3 12 2 Conversion to a different gas category DR LA 30 through 95 2 Detach the high low control b 3 Fit the burner pressure regulator a inclu...

Page 37: ...this cable 7 Fit the stop plug from the conversion set in the place of the metric strain relief 8 Connect the cables of the gas control valve the hot surface igniter and flame probe to the 6 terminal...

Page 38: ...ol valve the hot surface igniter and the flame probe from the 6 terminal connector strip 6 and the strain relief 7 5 Fit the timers 4 including cable harness plus 9 terminal connector strip 6 from the...

Page 39: ...urn valve f circulation pump optional g drain valve h manual gas valve mandatory i stop valve mandatory j temperature gauge recommended k top to bottom recirculation pump optional l draught diverter m...

Page 40: ...2 2 Filling vented installations To fill the water heater proceed as follows 1 Open the stop valve i in the hot water pipe and if present the stop valves d for the circulation pump 2 Shut drain valve...

Page 41: ...me service activities require the water heater to be drained The procedure is as follows 1 Shut the water heater down by putting the On Off switch to position 0 2 Switch the mains isolation off 3 Shut...

Page 42: ...Filling and draining 42 Instruction manual DR LA 4 gis...

Page 43: ...tion of the symbols 5 4 ON OFF switch 5 5 Control thermostat 5 6 Burner control reset button 5 7 Flue gas thermostat reset button 5 2 Control panel Figure 5 1 shows the control panel The panel consist...

Page 44: ...control panel will illuminate After eliminating the cause of the error you can reset the water heater using the reset button n Caution Before resetting always eliminate the cause of the error To ident...

Page 45: ...n the flue gas thermostat will immediately lock out again The water heater will then automatically start up again if there is a demand If this does not happen refer to chapter 8 Troubleshooting for a...

Page 46: ...Controls 46 Instruction manual DR LA 5 gis...

Page 47: ...an error the heater will not operate The frost protection will also be out of operation If the water heater should go into an error state you will be unable to continuosly draw hot water These error...

Page 48: ...detailed overview of error states please refer to chapter 8 Troubleshooting If as end user you find the water heater in an error status you may attempt to re start the water heater by pressing the re...

Page 49: ...e Isolate the water heater from the power supply Shut the water heater down for a longer period 7 3 1 Shut the water heater down for brief periods OFF mode To shut the water heater down for a brief pe...

Page 50: ...perature falls below the set temperature e g 60 C causing the control thermostat to close The burner control now detects a heat demand and starts the heating cycle 2 After heat demand is detected the...

Page 51: ...errors of the burner control In this event the red error LED on the control panel will be illuminated The burner control is locked out After eliminating the cause the water heater must be returned to...

Page 52: ...No naked flames Warning Ventilate the boiler room n Caution Immediately contact your installer or local gas company Water leakage Leakage from one of the water connections threaded Tighten the thread...

Page 53: ...y better ventilating the boiler room Table 8 1 General errors Page 2 of 2 Symptom Cause Solution Remark Table 8 2 No hot waterPage 1 of 2 Symptom Cause Solution Remark Green LED OFF and Red LED OFF No...

Page 54: ...l Check the gas control wiring 2 No ignition Check whether the hot surface igniter lights up Check the power supply to the hot surface igniter Check the wiring of the hot surface igniter 3 No flame de...

Page 55: ...temperature setting Tset is too low Set the control thermostat to a higher setting See paragraph 5 5 Control thermostat Hot water supply used up 1 Reduce the rate of hot water consumption Allow the wa...

Page 56: ...is Instruction manual DR LA 56 Warning Maintenance may only be performed by a qualified service and maintenance engineer...

Page 57: ...ing steps 1 Put the ON OFF switch on the control panel to position 0 2 Set the control thermostat note the original setting to the highest position and put the ON OFF switch back to position I 3 If th...

Page 58: ...e them 12 Now also check the flue baffles Replace them if necessary See paragraph 9 4 4 Checking the flue baffles 13 Fit a new sealing ring around the edge of the hot water tank and replace the cover...

Page 59: ...g a suitable cleaner 7 Close the cleaning opening To avoid damage to the tank the bolts that fasten the lid should be tightened with a torque no greater than 50 Nm Use suitable tools for this To prope...

Page 60: ...of paragraph 9 3 2 Checking the anodes 2 Remove the flue baffles from the water heater 3 Check the flue baffles for rust and remove any which is present 4 Check the flue baffles for wear and replace...

Page 61: ...Instruction manual DR LA 61 A Appendices 1 1 Introduction This appendix contains The Electrical diagram DR LA is...

Page 62: ...10A B Frost thermostat C Control thermostat D On Off switch E Safety thermostat F High limit thermostat G Gas valve H Hot surface igniter J Flame probe K Error detection L On detection M Reset button...

Page 63: ...mit thermostat G Gas valve H Hot surface igniter J Flame probe K Error detection L On detection M Reset button N Combustion products discharge safety device O Relay Max 250V 10A P High low control Q T...

Page 64: ...Appendices 64 Instruction manual DR LA A is...

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