Roca LAURA 20 Manual
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Roca LAURA 20 Manual

Wall-hung on-demand combination water heater
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LAURA 20/20F
Wall-Hung On-Demand Combination Waterheater

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Summary of Contents for Roca LAURA 20

  • Page 1 LAURA 20/20F Wall-Hung On-Demand Combination Waterheater...

  • Page 2: Table Of Contents

    Cross-section of gas valve Table of contents Gas changeover Kit Overall view Overall dimensions Components of the boilers F and T Pre-plumbing jig and Wall Spacing Frame Flue duct kit (I) Installation recommendations Flue duct kit (II) Start-up Checklist (I) Flue duct kit (III) Start-up Checklist (II) Flue duct kit (V)

  • Page 3: Overall View

    Laura 20/20F CERTIFIED FOR NORTH AMERICA CANADA Low NOx emission level (Class 3) Laura 20/20F Electrical protection level: IP44D CE market. These waterheaters comply with the requirements of the Electromagnetic Compatibility Directive 89/336/EEC, the Gas Appliance Directive 90/396/EEC,the Low Voltage Directive 73/23/EEC, and the Efficiency Directive 92/42/EEC...

  • Page 4: Overall Dimensions

    247mm 9 3/4" 5" Ø int. Ø 127mm int. 33 1/2" 33 1/2" 850mm 850mm 15 7/16" 15 7/16" 17 23/32" 17 23/32" 392mm 392mm 450mm 450mm Laura 20/20F Laura 20/20F Overall Dimensions Laura 20/20F wall-hung waterheaters...

  • Page 5: Pre-Plumbing Jig And Wall Spacing Frame

    Wall-mounting bracket, supplied with the pre-plumbing jig Distance from the wall: 6 1/2" 163 mm Pre-Plumbing Jig and Wall Spacing Frame Gap between connections: 2 3/8" 60mm Laura 20/20F wall-hung waterheaters...

  • Page 6: Installation Recommendations

    Observe current regulations and minimum distance from flammable materials 19/32" minimum 1.5cm 15 3/4" minimum 40cm Please refer to the Instructions which are delivered with the appliance Installation Recommendations Laura 20/20F wall-hung waterheaters...

  • Page 7: Start-Up Checklist (Ii)

    (p22) until the leaving water temperature is 120ºF/49ºC (on screen, upper right), at full output. If a gas meter is available , check the gas supply pressure (p8 & p37 gas supply pressure test point). S tart-Up Checklist (l) Laura 20/20F wall-hung waterheaters...
  • Page 8 If the red light appears two or three consecutive times, tell the user to write down the fault codes and notify the nearest Service Center or Installer. Train user on the various safety devices, recommendations and maintenance operations specified in the waterheater instructions. Star t-Up Checklist (ll) Laura 20/20F wall-hung waterheaters...

  • Page 9: Pressures Of Gas

    Gas input rates and pressures with Natural gas (G20) are for a L.H.O.= 36,500Btu/m, density= 0,62, 59ºF and 14.7 PSI Gas supply pressure test point (*) measured under standard conditions (59°F and 14.7 PSI) (On the gas governor) (**) burner setting pressure Pressures of Gas Laura 20/20F wall-hung waterheaters...

  • Page 10: Electronic Pcb

    DHW DEMAND SOLENOID VAL VE AND BOILER MODEL SOLENOID VAL VE AND BOILER MODEL SENSORS AND LIMIT STA TS SENSORS AND LIMIT STA TS HOME AUTO. HOME AUTO. REMOTE CONTROL REMOTE CONTROL PRESION PRESION Electronic PCB Laura 20/20F wall-hung waterheaters...

  • Page 11: Electrical Wiring

    Flow meter mass Black POWER SOCKET 230v LACK-OF-WA TER PRESSURE SWITCH CONTROL CONNECTOR Flow meter signal White Flow meter supply IGNITION ELECTRODES AND IONISATION SENSOR Grey Heating Pressure switch Heating Pressure switch ELECTRONIC BOX Electrical Wiring Laura 20/20F wall-hung waterheaters...
  • Page 12 Flow detector device 1ª Speed BLUE Common DHW sensor BLACK Lack-of-water pressure switch Line volt thermostat 2ª Speed BROWN Telephone Power socket control via 110V Teletherm MT2 Fan assisted waterheater Natural draft open flue waterheater Electrical Wiring Laura 20/20F wall-hung waterheaters...

  • Page 13: Main Components (I)

    Top fixing: Locating pins Bottom fixing: Screws Removable decorative Color of casing: White RAL 9016 Stages of Output: 27,772 Btu 47,608 Btu 59,511 Btu 71,413 Btu 79,347 Btu Adjustable for Heating Net efficiency: 85% Main Components (I) Laura 20/20F wall-hung waterheaters...

  • Page 14: Main Components (Ii)

    Stainless steel. 13 “becks” “Clover-like” flame on the ends for interlighting. Mini-accumulator Capacity: 1.6 qt/1.5 litres. Made of copper Combustion chamber Compact. Side fixing rods Ignition electrodes and flame rod Flow detector device Circulator Main Components (II) Laura 20/20F wall-hung waterheaters...

  • Page 15: Control Panel

    3. DHW service 4. Stop Fault Warning and Reset Button Set Central Heating Temperature Set DHW Temperature Operating Temperature Control Knob Digital LCD Display Set Time Validate Program Mode Selection: Manual/Program Set Day Set Day/Time/Programmer Knob Control Panel Laura 20/20F wall-hung waterheaters...

  • Page 16: Sleeve

    Operating Temperature Control Knob Heating+DHW service Digital LCD Display DHW service Set Time Stop Validate Program Fault Warning and Reset Button Mode Selection: Manual/Program Set Central Heating Temperature Set Day Set DHW Temperature Set Day/Time/Programmer Knob Sleeve Laura 20/20F wall-hung waterheaters...

  • Page 17: Demand For Heating

    Press the Set Central Heating Temperature button. The green lamp will light up and the temperature digits on the display will flash. Turn the temperature control knob as required. To exit the mode, press any button or wait 10 seconds. Demand for Heating Laura 20/20F wall-hung waterheaters...

  • Page 18: Demand For Dhw (Winter)

    Press the Set DHW Temperature button. The green lamp will light up and the temperature digits on the display will flash. Turn the temperature control knob as required. To exit the mode, press any button or wait 10 seconds. Demand for DHW Laura 20/20F wall-hung waterheaters...

  • Page 19: Demand For Dhw (Summer)

    Press the Set DHW Temperature button. The green lamp will light up and the temperature digits on the display will flash. 3. Turn the temperature control knob as required. To exit the mode, press any button or wait 10 seconds. Demand for DHW Laura 20/20F wall-hung waterheaters...

  • Page 20: Stop And Fault

    1. Press the Stop button. The boiler will switch to permanent monitoring mode. 1. The fault code will be displayed on the screen. See list on last page. 2. The reset button will also light up. If necessary, press it once the fault has cleared. Stop and Fault Laura 20/20F wall-hung waterheaters...

  • Page 21: Set Time

    1. Press the Set Time button. The day will flash. 2. Using the Set Day/Time Knob, set the desired day ( 1 for Monday, 2 for Tuesday, etc. 3. To exit this mode, press the Set Time button again. Set Time Laura 20/20F wall-hung waterheaters...

  • Page 22: Hydraulic Circuit

    Ø 0.55"/14 mm external Ø 0.71"/18 mm external Mini-accumulator Circulator 0.4 gal/1.5 litres 3 speed DHW sensor Lack-of-water pressure switch DHW Outlet Pipe Ø 0.55"/14 external Analogic gauge Safety Valve Flow detector device Fill point valve Hydraulic Circuit Laura 20/20F wall-hung waterheaters...

  • Page 23: Mains Water Inlet

    Flow detector Signal to electronic device control panel Mains water inlet Inlet filter Flow adjustment screw Fill point valve Mains Water Inlet Laura 20/20F wall-hung waterheaters...
  • Page 24 Flow meter performance on Laura waterheaters 198(750) 190(721) 185(700) 172(650) 162(612) 158(600) 148(560) 145(550) 132(500) 52(11) 41(5) 46(8) 57(14) 63(17) Temperature ºF (ºC) Pressure 29 psi/2 bar Flow Detector Device Laura 20/20F wall-hung waterheaters...

  • Page 25: Mini-Accumulator

    Insulation: Expanded Polystyrene (Porex) Capacity: 0.4 gal / 1.5 litres Inlet Outlet Mini-Accumulator Laura 20/20F wall-hung waterheaters...

  • Page 26: Safety Valve And By-Pass

    Inlet from heat exchanger Bypass automatic valve Flow to radiators Bypass connection Safety valve Opens at 5.8 psi / 0.4 bar Set at 43.5 psi / 3 bar Safety Valve and By-Pass Laura 20/20F wall-hung waterheaters...

  • Page 27: 3-Way Valve

    Turns in 10 seconds Flow to cylinder Inlet from heat exchanger Flow to radiators Safety valve Quick connect Set at 43.5 psi / 3 bar Bypass connection Opens at 5.8 psi / 0.4 bar Anti-backdraught valve 3-way Valve Laura 20/20F wall-hung waterheaters...

  • Page 28: Gauge And Lack-Of-Water Pressure Switch

    5 seconds for 3 minutes, will stop for 2 hours, then will continue beeping for another 3 minutes, after which it will stop for good. Return from radiators Analogic gauge Bypass connection Connection to fill point valve Gaug e and Lack-of-Water Pressure Switch Laura 20/20F wall-hung waterheaters...

  • Page 29: Central Heating Mode Operation

    194ºF/90 ºC 0.91 212ºF/100 ºC 0.67 230ºF/110 ºC 0.51 To radiators Maximum operating pressure: 43.5 psi / 3 bar Temperature selectable between 86ºF/30ºC and 194ºF/90ºC Heating Flow pipe Ø 0.71" / 18 mm external Central Heating Mode Operation Laura 20/20F wall-hung waterheaters...

  • Page 30: Dhw Mode Operation

    DHW sensor Temperature selectable between 86ºF/30ºC and 194ºF/60ºC Temp. Res. k 86ºF/30 ºC 8.060 Mains water inlet 104ºF/40 ºC 5.330 122ºF/50 ºC 3.605 140ºF/60 ºC 2.490 Outlet to draw-off points Ø 0.55"/14 external DHW Mode Operation Laura 20/20F wall-hung waterheaters...

  • Page 31: Overheat Thermostat

    LED Gas supply cuts off Gas supply cuts off Lockout Fault Fault corrected corrected Thermostat reset Thermostat reset Press red reset buttom Press red reset buttom Boiler reset Press reset buttom Service restored Overheat Thermostat Laura 20/20F wall-hung waterheaters...

  • Page 32: Flame Safeguard Rectification System (I)

    Light-up •Safety solenoid Lights up •End of spark ignition in less than valve closes Fault 3 secs. corrected •Service available •Display of fault code 12 and red LED Service now restored Flame Safeguard Rectification System (I) Laura 20/20F wall-hung waterheaters...

  • Page 33: Flame Safeguard Rectification System (Ii)

    Light-up •Safety solenoid Lights up •End of spark ignition in less than Fault valve closes 3 secs. corrected •Service available •Display of fault code 17 and red LED Service now restored Flame Safeguard Rectification System (II) Laura 20/20F wall-hung waterheaters...

  • Page 34: Chimney "Pull" Safety 20/20

    Stop Calling for Fault Display of fault code service corrected Waiting for service call 07 and red LED Fault corrected Light-up Calling for service Service now restored Stop Waiting for service call Chimney “Pull” Safety 20/20 Laura 20/20F wall-hung waterheaters...

  • Page 35: Process Of Code 22

    - If there is demand for DHW - Thermostat OFF - CH mode OFF Display: Code 22 Red LED flashing and beep-beep CHSPT=140ºF (60ºC) and the user cannot change it Before 10' DHWT<131ºF(55 ºC) Reset Process of Code 22 Laura 20/20F wall-hung waterheaters...
  • Page 36 Without inter-ignition rods Baffle plate Burner fixing to the gas valve Allen 4 x 15 Gas valve pressure test point bracket Flame sensing rod Cable entry bracket plate Average current: 3µA Safety time period: 5 seconds Burner Laura 20/20F wall-hung waterheaters...

  • Page 37: Combustion Chamber

    Front insulation panel Material: Ceramic Fibre Material: Ceramic Fibre Side tabs Fold them after fitting side insulation panels Compact combustion chamber M5 Set Nuts Threaded Rods for Chassis For fixing the burner baffle plate fixing M5 Combustion Chamber Laura 20/20F wall-hung waterheaters...

  • Page 38: Kit Valve G20 And G25

    27,771 Btu Solenoid valve. Blue cable Gas supply pressure test point Safety Allen key 4mm G20 (NG): 6-12 wc" (15-30 mbar) Solenoid valve. Red cable G31 (LP): 14.85 wc" (37 mbar) Kit Valve G20 and G25 Laura 20/20F wall-hung waterheaters...
  • Page 39 Gas valve body 47,608 Btu Material: Aluminum Solenoid valve. Orange cable Solenoid Assembly Gasket 27,771 Btu Material: Cork + Nitrile Solenoid valve. Blue cable Solenoid valve assembly Safety Solenoid valve. Red cable Cross-section of Gas Valve Laura 20/20F wall-hung waterheaters...
  • Page 40 Propane/Butane Gas Kit Natural Gas kit (To convert a Natural Gas waterheater (To convert a Propane/Butane Gas waterheater to Natural Gas) to Propane/Butane Gas) Kit G20 / G25 Kit G30 / G31 Gas Chang eover Kit Laura 20/20F wall-hung waterheaters...
  • Page 41 Pressure switch connecting pipes Exhaust fan 2 speed Hood extractor 1st speed: R.P .M.:1,900 Average current: 0.13 A 2nd speed: R.P .M.:2,720 Average current: 0.35A Flue Components of the Waterheater Laura 20/20F wall-hung waterheaters...
  • Page 42 Kit 140040030-03 for F waterheaters (supplied as standard). Flue Duct Kit (I) Laura 20/20F wall-hung waterheaters...
  • Page 43 Laura 20/20 F Ø 4"(100mm) Configuratión C12: Horizontal concentric flue pipe. Flue gases discharged directly into the atmosphere. Flue Duct Kit (II) Laura 20/20F wall-hung waterheaters...
  • Page 44 Laura 20/20 F 10' (3m) Horizontal concentric flue pipe connected to twin common shunt or stack. Configuratión C42: Laura 20/20F wall-hung waterheaters...
  • Page 45 140040034-03 Configuration C32. Directional, concentric vertical flue pipe kit with Ø 60/100 damper. Quick coupling. 1 m vertical flue length. 140040059-00 Optional vertical concentric accessory in the C32 configuration for vetical outlet to the roof. Flue Duct Kit (V) Laura 20/20F wall-hung waterheaters...
  • Page 46 Each 90°concentric elbow Ø 100/60 o Ø 125/80 reduces 0.7 m Each single 90° elbow Ø 80 reduces 0.5 m. The first boiler outlet elbow should not be taken into account. No reduction is necessary when using 45°elbows. Flue Duct Kit (VII) Laura 20/20F wall-hung waterheaters...
  • Page 47 24-hour time clock is then displayed. 2. With the Set Day/Time Knob, set the desired day. 3. The arrow beside the number should indicate the desired day. 4. Press the Validate Program button to store the day. Central Heating Programming (I) Laura 20/20F wall-hung waterheaters...
  • Page 48 1. Using the Set Day/Time/Programmer Knob, move the flashing schedule sector. 2. Set this sector at the time you wish the first operating event of the day to start. 3. When that is correctly positioned, press the Validate Program button. Central Heating Programming (II) Laura 20/20F wall-hung waterheaters...
  • Page 49 1. Using the Set Day/Time/Programmer Knob, move the sectors to the time you wish the boiler to switch off. 2. You will notice that as you progress the sectors will remain lit. 3. Press the Validate Program button to store the first event. Central Heating Programming (III) Laura 20/20F wall-hung waterheaters...
  • Page 50 4. Once the first day of the week has been scheduled, press the Set Day button; and the rest of the days can now be programmed. 5. To exit this mode, press any button. Central Heating Programming (IV) Laura 20/20F wall-hung waterheaters...
  • Page 51 1. To set the boiler under the programming mode, press the Mode Selection: Manual/Program key. 2. Should the clock symbol appear on the LCD display, it means that the waterheater is under the Central Heating mode. Central Heating Programming (V) Laura 20/20F wall-hung waterheaters...
  • Page 52 (10). solenoid on the gas valve. PO = Thermostat activated P 1 = continuous operation in CH mode Press the Validate Program button (11) to store the change Set-up (I) Laura 20/20F wall-hung waterheaters...
  • Page 53 29 will be displayed. This screen displays the value on the flue gas pressure switch (in mbar x 10). Example on display: 2 mm w.g. Press the Validate Program button (11) to store the change. Set-up (II) Laura 20/20F wall-hung waterheaters...
  • Page 54 Clean the burner Venturis • Combustion and Ventilation Check the flue duct tightness • Check the effectiveness of ventilations and air renewal system. Ensure there are no obstuctions • • Conduct a flue gas analysis Maintenance Laura 20/20F wall-hung waterheaters...
  • Page 55 Faulty internal wiring or bad contact of panel pins (*) Whenever these fault codes appear, reset the waterheater by turning the selector knob to the reset buttom. For the other codes, the waterheater will reset automayically once the fault is cleared. Fault Codes Laura 20/20F wall-hung waterheaters...
  • Page 56 Erro r C ode s Code 01 & 02: Interruption of the DHW (01) and Heating (02) circuit sensors 1. The sensors (DHW or Heating) are out of order  Verify the Ohm-value of the sensors with an Amp- meter, and change the sensor if broken. 2.
  • Page 57 Code 14 (50-60-70-90): Overheating during flame  • The water inside the heat-exchanger exceeds of 221º F The overheating sensor opens while the flame is burning. The causes are the same as in the Code 06, with the difference that the overheating sensor has a bad contact and does not reads properly the temperature.
  • Page 58 Code 17 (40-80-90): Error in the flame detection during boiler function The control panel does not recieves flame detection while the burner is burning (the boiler already flamed up and is working) All causes are the same than in Code 12, except the problems related to the sparkle (because the boiler already lighted up successfully).
  • Page 59 Laura 20/20F Stopped Heating Outlines Hydraulic (I) Laura 20/20F wall-hung waterheaters...
  • Page 60 Outlines Hydraulic (II) waterheater heating loop side of the unit Domestic Hot Water; Fill & Backflow Change; 30 psi ASME Relief Valve Laura 20/20F wall-hung waterheaters...

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