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LAURA 20/20F Wall-Hung On-Demand Combination Waterheater
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Table of contents Overall view Overall dimensions Pre-plumbing jig and Wall Spacing Frame Installation recommendations Start-up Checklist (I) Start-up Checklist (II) Pressures of gas Electronic PCB Electrical wiring Laura 2020 F Electrical wiring Main components (I) Main components (II) Control panel Sleeve Demand for Heating Demand for DHW (Winter) Demand for DHW (Summer) Stop and fault Set Time Hydraulic circuit Mains Water Inlet Demand for Heating Mini-accumulator Safety valve and By-Pass 3-way valve Gauge and Lack-of-water pressure switch Central Heating mode operation DHW mode operation Overheat thermostat Flame safeguard rectification system (I) Flame safeguard rectification system (II) Chimney “pull” safety 20/20 Process of code 22 Burner Combustion chamber Kit valve G20 and G25
Table of Contents Laura wall-hung waterheaters
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38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
Cross-section of gas valve Gas changeover Kit Components of the boilers F and T Flue duct kit (I) Flue duct kit (II) Flue duct kit (III) Flue duct kit (V) Flue duct kit (VII) Central Heating programming (I) Central Heating programming (II) Central Heating programming (III) Central Heating programming (IV) Central Heating programming (V) Set-Up (I) - TECHNICIAN ONLY Set-Up (II) - TECHNICIAN ONLY Mantenance Fault codes Outlines hydraulic (I) Outlines hydraulic (II)
CSA
Laura 20/20F
CERTIFIED FOR NORTH AMERICA
USA 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 .
Overall View Laura 20/20Fwall-hung waterheaters
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Ø 5" int.
247mm 9 3/4"
Ø 127mm int.
33 1/2" 850mm
33 1/2" 850mm
15 7/16" 392mm
17 23/32" 450mm
15 7/16" 392mm
Laura 20/20F
Laura 20/20F
Overall Dimensions Laura 20/20F wall-hung waterheaters
17 23/32" 450mm
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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
PMI
Laura 20/20F wall-hung waterheaters
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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
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Connect power supply 220v 15 amp service Connect room thermostat. Unlock the pump motor shaft (turn center screw to bleed). Make sure flue vent is properly installed. Fill the primary loop (if no DHW storage tank has been installed) slowly until the pressure reaches 1-2 bar. (If a DHW storage tank has been installed, then fill the secondary loop first). Open the DHW circuit for it to fill up and vent. With the gas inlet cock closed, start up the Central Heating/DHW mode (p15 #2). The boiler will per form a lighting cycle and will then lock out under code 12. Leave it like that for five minutes so that the pump , which is still running, can help vent the circuit. Next chec k the pressure level (p14 #1) and top up if it has dropped below 1 .5 bar. Open the gas inlet cock, reset the system ( p14 #5) and the boiler will start operating. Allow the boiler to operate in the Heating mode for ten minutes , in which period it should be checked that all radiators warm up. Should one radiator fail to warm up, bleed the air out of it. But if it still does not warm up, ays optimizing the pump performance curve then the flow rates in all radiators should be balanced, alw (flow rate/pressure) through its speed selector control (to left of pump - select one of three settings). Open the DHW tap with highest flow rate in the house. The boiler will operate for ten minutes continuously at full output. If the flue spillage detection thermostat (p40) does not trip, that means that the removal of flue gases is correct. The DHW flow can be adjusted if necessary. To do that, open the tap fully and turn the main water inlet flow adjustment screw (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
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Connect tester to the operating gas pressure test point and check the working pressure with the boiler operating at full output. Remove the tester, replace the plug and washer, restart the system, and using soapy water check the whole circuit for gas tightness. For a higher level of comfort, particularly where substantial pressure variations in the water supply occur, set the program close to the draw-off temperature.
Instruct the user on the following points: Recommend user to read the User’s Instructions. Instruct user on how to program the Central Heating and DHW temperature and the room thermostat (if any). Instruct user on how to top up the Heating system (1.5 mbar). Demonstrate how the fault codes work for insufficient gas (12 and 17). This is the most common fault code due to user error. Demonstrate to user how to reset after opening the gas inlet cock. Recommend that user press reset button (p14 #5) whenever a red fault lamp lights up. 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.
Start-Up Checklist (ll) Laura 20/20F wall-hung waterheaters
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Gas Inlet Pressure: G20(NG - Natural Gas): 8 water column inches (20 mbar) G31(LP - Liquid Propane): 11.0 water column inches (27.4 mbar) Operating gas pressure test point Gas Input Rate (m3/h) (*) Pressure (mmwg) (**) G20 G31 Heat Output G20 G31 341 1.06 83 2.38 79,347 Btu 332 1.04 71 2.26 71,412 Btu 241 55 0.89 1.96 59,510 Btu 179 38 0.77 1.64 47,608 Btu 52 14 0.38 0.87 27,771 Btu Gas input rates and pressures with Natural gas (G20) are for a L.H.O.= 36,500Btu/m,3 density= 0,62, 59ºF and 14.7 PSI (*) measured under standard conditions (59°F and 14.7 PSI) (**) burner setting pressure
Pressures of Gas Laura 20/20F wall-hung waterheaters
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Gas supply pressure test point (On the gas governor)
Rear view of electronic PCB
2A
C.T. 12/230
C.T. FUSE SAFETY FUSE
IGNITION TRANSFORMER
SAFETY RELAYS
T 160 MA
RELAYS
RELAYS
RELAYS
RELAYS
CHIMNEY SWEEP
Sw10
3.15 A
MAIN FUSE
TELEPHONE REMOTE CONTROL
WATER PRESION
EXHAUST FAN AND PUMP DHW DEMAND
SOLENOID VALVE AND BOILER MODEL
Electronic PCB Laura 20/20F wall-hung waterheaters
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SENSORS AND LIMIT STATS
HOME AUTO.
THERMOSTAT COMMUNICATIONS
RÉSEAU
DHW SENSOR
Fan 1 speed Fan 2 speed Common exhaust fan Pump Pump
Blue Brown Black Blue Brown
EXCHANGER SAFETY DEVICE VARIABLE SIGNAL PRESSURE SWITCH
GAS VALVE HEATING SENSOR
SAFETY VALVE 27,769 Btu/7 Th PUMP
47,604 Btu/12 Th 71,406 Btu/18 Th
59,505 Btu/15 Th 79,340 Btru/20 Th
Sanitarium sensor Sanitarium sensor Heating sensor Heating sensor Bridge Bridge Exchanger safety device Exchanger safety device Earth Pressure switch (Vcc) Pressure switch (Signal) Pressure switch (GND)
Orange Orange Grey Grey
Valves common Safety valve Valve 18Th Valve 12Th Valve 7Th
Brown Red Grey Orange Blue
Blue Blue Green/yellow Red Blue Black
FLOW DETECTOR DEVICE
Bridge Bridge
A.T. BRIDGE TWO SPEED FAN
TELEPHONE REMOTE CONTROL CONNECTOR
POWER SOCKET 230v
LACK-OF-WATER PRESSURE SWITCH
Flow meter mass Flow meter signal Flow meter supply
Black White Red
Heating Pressure switch Heating Pressure switch
Grey Red
IGNITION ELECTRODES AND IONISATION SENSOR
ELECTRONIC BOX
Electrical Wiring Laura 20/20F wall-hung waterheaters
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Anti-backdraught safety device Overheating safety device
Heating sensor
Flow detector device
1ª Speed BLUE
Common DHW sensor
Lack-of-water pressure switch
BLACK
Line volt thermostat 2ª Speed BROWN
Telephone control via Teletherm MT2
Power socket 110V
Natural draft open flue waterheater
Electrical Wiring Laura 20/20F wall-hung waterheaters
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Fan assisted waterheater
Compact casing 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
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Draught Diverter Ø flue socket collar: 127 Flue duct Ø 4.9" / 125 mm
Expansion Vessel Fill pressure: 10.88 psi / 0.75 bar. Butyl diaphragm and nitrogen charge Total/Useful capacity: 2.11 gal/1.19 gal (8 litres/4.5 litres)
Flue Spillage Limit Thermostat Set at: 149º F / 65º C
Heat Exchanger Bithermal. 6 steps in DHW andHeating. Made of copper and high-temperature aluminium paint.
Gas Valve 5 stages of output. Nat Gas governor: 6.8:8 wc" (17:25 mbar). No internal diaphragms. Coil voltage: 12Vdc.
Burner 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
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Flow Meter
Circulator
Air Purge
Control Panel for Laura 20/20F 1. Pressure gauge 2. Heating+DHW service 3. DHW service
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4. Stop 5. Fault Warning and Reset Button 6. Set Central Heating Temperature
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7. Set DHW Temperature 8. Operating Temperature Control Knob
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6
2 3
12
9. Digital LCD Display
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10. Set Time 11. Validate Program 12. Mode Selection: Manual/Program 13. Set Day 14. Set Day/Time/Programmer Knob
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Control Panel Laura 20/20F wall-hung waterheaters
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14
10
8
5
4
12
13
11
10
7
9
8
14
2
6
3
5
1
4
1.
Pressure gauge
8.
Operating Temperature Control Knob
2.
Heating+DHW service
9.
Digital LCD Display
3.
DHW service
10.
Set Time
4.
Stop
11.
Validate Program
5.
Fault Warning and Reset Button 12.
Mode Selection: Manual/Program
6.
Set Central Heating Temperature 13.
Set Day
7.
Set DHW Temperature
Set Day/Time/Programmer Knob
Sleeve Laura 20/20F wall-hung waterheaters
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14.
Winter Mode
(1)
(2)
1 2 3 4 5 6 7
(3)
1. 2. 3.
Press button for Central Heating + DHW service. The green indicator lamp will light up. 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
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Winter Mode
(1)
(2)
(3)
1. 2. 3.
Press button for Central Heating + DHW service. The green indicator lamp will light up. 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
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Summer Mode
(1)
(2)
(3)
Press button for DHW service. The green indicator lamp will light up. 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.
1. 2.
Demand for DHW Laura 20/20F wall-hung waterheaters
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(1)
1. Press the Stop button. The boiler will switch to permanent monitoring mode.
(1)
(2)
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
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(1) (2)
Setting the Time 1. Press the Set Time button. The clock hands will flash on the LCD display. 2. Using the Set Day/Time Knob, set the desired time. Setting the Day 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
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Expansion Vessel Fill pressure:10.88 psi/0,75 bar. Butyl diaphragm and nitrogen charge Useful capacity:1.19 gal (/4.5 litres)
Overheating safety device automatic reset Set at 221ºF/105 ºC
Heat Exchanger 6 steps in Heating: 3 for flow and 3 for return Primary capacity: 0.08 gal/300 cm3 3 Secondary capacity: 0.07 gal/270 cm
Heating sensor Heating return pipe Ø 0.71"/18 mm external
Domestic Cold Water Inlet Pipe
Heating Flow pipe
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
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Flow detector device
Signal to electronic control panel
Mains water inlet
Inlet filter
Flow adjustment screw Fill point valve
Mains Water Inlet Laura 20/20F wall-hung waterheaters
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Flow meter performance on Laura waterheaters
Outlet flow rate gallons (litres)/hour
198(750) 190(721) 185(700)
172(650) 162(612) 158(600) 148(560) 145(550)
132(500)
41(5)
46(8)
52(11) Temperature ºF (ºC) Pressure 29 psi/2 bar
Flow Detector Device Laura 20/20F wall-hung waterheaters
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57(14)
63(17)
Insulation: Expanded Polystyrene (Porex)
Capacity: 0.4 gal / 1.5 litres
Inlet
Outlet
Mini-Accumulator Laura 20/20F wall-hung waterheaters
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Inlet from heat exchanger
Bypass automatic valve
Flow to radiators
Safety valve Set at 43.5 psi / 3 bar
Safety Valve and By-Pass Laura 20/20F wall-hung waterheaters
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Bypass connection Opens at 5.8 psi / 0.4 bar
Electrical connection for 3-way valve
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
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Connection to pump
Lack-of-water Pressure Switch with beeper
If pressure drops below 7.25 psi / 0.5 bar, an intermittent beep will be sounded and code 03 will be displayed.The beep will sound every 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
Gauge and Lack-of-Water Pressure Switch Laura 20/20F wall-hung waterheaters
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Expansion Vessel Fill pressure:10.88 psi / 0.75 bar. Butyl diaphragm and nitrogen charge Useful capacity: 1.19 gal (4,5 litres)
Heating sensor Temp.
Res. kW
14ºF/10 ºC 55.2 32ºF/ 0 ºC 32.6 50ºF/10 ºC 19.9 68ºF/20 ºC 12.4 77ºF/25 ºC 10.0 86ºF/30 ºC 8.06 104ºF/40 ºC 5.33 122ºF/50 ºC 3.60 140ºF/60 ºC 2.49 158ºF/70 ºC 1.75 176ºF/80 ºC 1.25 194ºF/90 ºC 0.91 212ºF/100 ºC 0.67 230ºF/110 ºC 0.51
Heat Exchanger 6 steps in Heating: 3 for flow and 3 for return 3 Primary capacity: 0.08 gal/ 300 cm Secondary capacity: 0.07 gal/ 270 cm3
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
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Maximum operating pressure: 101.5 psi / 7 bar Overshooting and scale prevention 0” ON, 4’ OFF and 3” ON Possibility of change acc. To needs Exchanger
Mains inlet pipe
6 steps DHW Primary capacity : 0.08 gal/300 cm 3 Secondary capacity : 0.07 gal/270 cm 3
Ø 0.55"/14 external
Mini-accumulator
DHW sensor Temperature selectable between 86ºF/30ºC and 194ºF/60ºC Temp. Res. kW 86ºF/30 ºC 104ºF/40 ºC 122ºF/50 ºC 140ºF/60 ºC
8.060 5.330 3.605 2.490
Mains water inlet Outlet to draw-off points Ø 0.55"/14 external
DHW Mode Operation Laura 20/20F wall-hung waterheaters
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Operation of the Overheat Thermostat Open during service
Open before light-up
Display of fault code 14 and red LED
Gas supply cuts off
Display of fault code 06 and red LED
Lockout No
Gas supply cuts off
No
Fault corrected
Fault corrected
Yes
Yes
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
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Overheat thermostat automatic reset 221ºF(105ºC)
Call for service (Light-up) Safety solenoid valve opens (gas inlet)
Spark ignition: ignition electrodes
1st solenoid valve opens (27,769 Btu/7 Th) Boiler reset
Attempt to light up
Lights up in less than 2 secs.
Press reset buttom Yes
2nd solenoid valve opens No (47,604 Btu/12 Th)
Yes
Lockout
Light-up •End of spark ignition •Service available
Yes
Lights up in less than 3 secs.
•End of spark ignition •Safety solenoid No valve closes •Display of fault code 12 and red LED
Fault corrected
No
Service now restored
Flame Safeguard Rectification System (I) Laura 20/20F wall-hung waterheaters 31
Interruption of service
Attempt to relight
Spark ignition: ignition electrodes
Safety solenoid valve opens (gas inlet)
1st solenoid valve opens (27,769 Btu/7 Th) Boiler reset
Light-up process
Lights up in less than 2 secs.
Press reset button Yes
2nd solenoid valve opens No (47,604 Btu/12 Th)
Yes
Lockout
Light-up •End of spark ignition •Service available
Si
•End of sparks ignition •Safety solenoid No valve closes •Display of fault code 17 and red LED
Lights up in less than 3 secs.
Fault corrected
No
Service now restored
Flame Safeguard Rectification System (II) Laura 20/20F wall-hung waterheaters
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Actuation before light-up
Actuation while in service Interruption of flue gas removal (insufficient chimney “pull”)
SPOTT safety open before light-up
Call for service
SPOTT safety detects backflow of flue gases
Light-up process Lockout
Three-minute pause before operating
Fault corrected
Pull restored
No
Yes
Dislay of fault code 07 and red LED
No
SPOTT automatic reset
Light-up
No
Service inSioperation
Lockout (SPOTT triggered)
Yes
Display of fault code 15 and red Led
Fault corrected
Yes
Call for service
Boiler reset
Press reset buttom
Yes Locked out again (Spott triggered) Stop
Waiting for service call
No
Calling for service
Fault corrected
Yes
Yes
Light-up
Service now restored
Yes
Calling for service
No
No Stop
Waiting for service call
Chimney “Pull” Safety 20/20 Laura 20/20F wall-hung waterheaters
Display of fault code 07 and red LED No
Yes
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SPOTT automatic reset
Fault corrected
No
Stop Wait for service call
No
CHSPT=Tª required by user
Legend CHSPT=Central Heating Setpoint Temperature CHT= Central Heating Temperature DHWSPT=DHW Setpoint Temperature DHWT= DHW Temperature
No
Yes
CHSPT=Tª required by user
Yes
No No DHWT>131ºF(64 ºC)
Before 10’ DHWT>147ºF (64 ºC)
Yes
CHSPT=122ºF (50 ºC) Tª required by user displayed. Code 22 not displayed.
Before 10' DHWT