manual+caldera+roca+laura+20 20f+(ingles)

Wall-Hung On-Demand Combination Waterheater

LAURA 20/20F

Laura wall-hung waterheaters

Table of Contents

Overall dimensions03Pre-plumbing jig and Wall Spacing Frame04Installation recommendations05Start-up Checklist (I)06Start-up Checklist (II)07Pressures of gas08Electronic PCB09Electrical wiring Laura 2020 F 10Electrical wiringMain components (I)12Main components (II)13Control panel14

Stop and fault19

Hydraulic circuit21Mains Water Inlet22Demand for Heating23Mini-accumulator24Safety valve and By-Pass253-way valve26Gauge and Lack-of-water pressure switch27Central Heating mode operation28

Flame safeguard rectification system (I)31Flame safeguard rectification system (II)32Chimney “pull” safety 20/2033Process of code 2234

Combustion chamber36Kit valve G20 and G2537

Cross-section of gas valveGas changeover Kit

38

Components of the boilers F and T39

Flue duct kit (II)41

Flue duct kit (V)43

Flue duct kit (VII)44

Central Heating programming (I)45

Central Heating programming (II)46

Central Heating programming (IV)

47

Central Heating programming (V)

48

Set-Up (I) - TECHNICIAN ONLY

49

5556

Flue duct kit (III)42

1

11

Sleeve15Demand for Heating16Demand for DHW (Winter)17

Flue duct kit (I)40

Demand for DHW (Summer)18

DHW mode operation29Overheat thermostat30

Burner35

Set-Up (II) - TECHNICIAN ONLY

50

Mantenance

51

Fault codes

52

Outlines hydraulic (I)

53

Outlines hydraulic (II)

54

Table of contents01Overall view02

Set Time20

Central Heating programming (III)

Overall View

2

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 .

Laura 20/20F

Low NOx emission level (Class 3) Laura 20/20F Electrical protection level: IP44D

Laura 20/20Fwall-hung waterheaters

CERTIFIED FOR NORTH AMERICA

CSA

USA CANADA

Overall Dimensions

3

17 23/32" 17 23/32"

33 1/2" 33 1/2"

15 7/16"

15 7/16"

Ø 5" int.9 3/4"

Laura 20/20F

Laura 20/20F

Laura 20/20F wall-hung waterheaters

Ø 127mm int.

247mm

450mm392mm

850mm850mm

392mm 450mm

Pre-Plumbing Jig and Wall Spacing Frame

4

Distance from the wall: 6 1/2"

Wall-mounting bracket, suppliedwith the pre-plumbing jig

Gap between connections: 2 3/8"

PMI


163 mm

60mm

Installation Recommendations

Observe current regulations and minimum distance from flammable materials

Please refer to the Instructions which are delivered with the appliance

5Laura 20/20F wall-hung waterheaters

15 3/4" minimum

19/32" minimum

40cm

1.5cm

S tart-Up Checklist (l)

6

Connect power supply 220v 15 amp serviceConnect 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 thatall radiators warm up. Should one radiator fail to warm up, bleed the air out of it. But if it still does not warm up,then the flow rates in all radiators should be balanced, alw ays optimizing the pump performance curve(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 minutescontinuously at full output. If the flue spillage detection thermostat (p40) does not trip, thatmeans that the removal of flue gases is correct.

If a gas meter is available , check the gas supply pressure (p8 & p37 gas supply pressure test point).

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.


Star t-Up Checklist (ll)

7

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 roomthermostat (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 notifythe nearest Service Center or Installer.Train user on the various safety devices, recommendations and maintenance operations specifiedin the waterheater instructions.


Pressures of Gas

8

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)

Gas supply pressure test point(On the gas governor)

Operating gaspressure test point

Gas input rates and pressures with Natural gas (G20) are for a3L.H.O.= 36,500Btu/m, density= 0,62, 59ºF and 14.7 PSI

(*) measured under standard conditions (59°F and 14.7 PSI)(**) burner setting pressure

2.382.261.961.640.87

8371553814

1.061.040.890.770.38

34133224117952

Heat Output79,347 Btu71,412 Btu59,510 Btu47,608 Btu27,771 Btu

3Gas Input Rate (m /h) (*)G20 G31

Pressure (mmwg) (**)G20 G31


9

Electronic PCB

Rear view of electronic PCB

CHIMNEY SWEEPSw10CHIMNEY SWEEPSw10

T 160 MA

3.15 A

2A

TELEPHONEREMOTE CONTROL

TELEPHONEREMOTE CONTROL

WATERPRESIONWATERPRESION DHW DEMANDDHW DEMAND

C.T.12/230C.T.12/230

SOLENOID VALVE AND BOILER MODELSOLENOID VALVE AND BOILER MODEL

IGNITIONTRANSFORMERIGNITIONTRANSFORMER

SENSORS AND LIMIT STATSSENSORS AND LIMIT STATS

SA

FE

TY

RE

LAY

SS

AF

ET

Y R

ELA

YS

SA

FE

TY

FU

SE

SA

FE

TY

FU

SE

RELAYSRELAYS RELAYSRELAYS RELAYSRELAYS RELAYSRELAYS

EXHAUST FAN AND PUMPEXHAUST FAN AND PUMPHOME AUTO.HOME AUTO.

C.T. FUSEC.T. FUSE

MAINFUSEMAINFUSE

RÉSEAURÉSEAUTHERMOSTAT COMMUNICATIONSTHERMOSTAT COMMUNICATIONS


White

BrownBlue

10

Electrical Wiring

HEATING SENSOR

EXCHANGER SAFETY DEVICE

FLOW DETECTOR DEVICE

LACK-OF-WATER PRESSURE SWITCH

PUMP

POWER SOCKET 230v

ELECTRONIC BOX

DHW SENSOR

VARIABLE SIGNAL PRESSURE SWITCH

TWO SPEED FANTELEPHONE REMOTECONTROL CONNECTOR

BrownRedGreyOrangeBlue

OrangeOrangeGrey

BlueBlueGreen/yellow

Grey

GreyRed

Red

BrownBlue

Black

BlueBlack

PumpPump

Safety valveValves common

Bridge

Exchanger safety device

Heating sensorHeating sensor

Sanitarium sensorSanitarium sensor

Exchanger safety device

Earth

Bridge

Heating Pressure switchHeating Pressure switch

Fan 1 speedFan 2 speed

Common exhaust fan

Bridge

Pressure switch (Signal)Pressure switch (Vcc)

Pressure switch (GND)

Flow meter massFlow meter signal

Flow meter supply

Bridge

Black

Red

Valve 18ThValve 12Th

Valve 7Th

SAFETY VALVE

27,769 Btu/7 Th

47,604 Btu/12 Th

71,406 Btu/18 Th

59,505 Btu/15 Th

79,340 Btru/20 Th

IGNITION ELECTRODESAND IONISATION SENSOR

A.T.BRIDGE


GAS VALVE

11

Electrical Wiring

Natural draft open flue waterheater

Power socket110V

Line voltthermostat

Telephonecontrol viaTeletherm MT2

Lack-of-waterpressure switch

Flow detector device

Heatingsensor

Overheatingsafety device

DHW sensor

Anti-backdraughtsafety device

BLACK

BROWN

BLUE

Fan assisted waterheater

1ª Speed

Common

2ª Speed


Main Components (I)

12

Compact casingTop fixing: Locating pinsBottom fixing: ScrewsRemovable decorative

Color of casing: WhiteRAL 9016Stages of Output:27,772 Btu 47,608 Btu 59,511 Btu 71,413 Btu 79,347 BtuAdjustable for Heating

Net efficiency: 85%


Draught DiverterØ flue socket collar: 127 Flue duct Ø 4.9" / 125 mm

Expansion VesselFill pressure: 10.88 psi / 0.75 bar. Butyl diaphragm and nitrogen chargeTotal/Useful capacity: 2.11 gal/1.19 gal (8 litres/4.5 litres)

Flue Spillage Limit ThermostatSet at: 149º F / 65º C

Heat ExchangerBithermal. 6 steps in DHW andHeating. Made ofcopper and high-temperature aluminium paint.

Gas Valve5 stages of output. Nat Gas governor: 6.8:8 wc" (17:25 mbar).No internal diaphragms. Coil voltage: 12Vdc.

Combustion chamberCompact. Side fixing rods

Ignition electrodes andflame rod

BurnerStainless steel. 13 “becks” “Clover-like” flame on theends for interlighting.

Mini-accumulatorCapacity: 1.6 qt/1.5 litres. Made of copper


Circulator

Main Components (II)


Control Panel

14

1. Pressure gauge

2. Heating+DHW service

3. DHW service

4. Stop

5. Fault Warning and Reset Button

6. Set Central Heating Temperature

7. Set DHW Temperature

8. Operating TemperatureControl Knob

9. Digital LCD Display

10. Set Time

11. Validate Program

12. Mode Selection: Manual/Program

13. Set Day

14. Set Day/Time/Programmer Knob

Air PurgeCirculatorFlow Meter

Control Panel forLaura 20/20F

1

3

2

458101413

12

11

9 7 6


Sleeve

15

1. Pressure gauge

2. Heating+DHW service

3. DHW service

4. Stop

5. Fault Warning and Reset Button

6. Set Central Heating Temperature

7. Set DHW Temperature

8. Operating Temperature Control Knob

9. Digital LCD Display

10. Set Time

11. Validate Program

12. Mode Selection: Manual/Program

13. Set Day

14. Set Day/Time/Programmer Knob

8 3 5 4

12679101112

13 14


Demand for Heating

16

1234567

(2) (1)

(3)

1. Press button for Central Heating + DHW service. The green indicator lampwill light up.

2. Press the Set Central Heating Temperature button. The green lamp will lightup and the temperature digits on the display will flash.

3. Turn the temperature control knob as required. To exit the mode, pressany button or wait 10 seconds.

Winter Mode


Demand for DHW

17

1. Press button for Central Heating + DHW service. The green indicator lampwill light up.

2. Press the Set DHW Temperature button. The green lamp will lightup and the temperature digits on the display will flash.

3. Turn the temperature control knob as required. To exit the mode, pressany button or wait 10 seconds.

(1)

(2)

(3)

Winter Mode


Demand for DHW

18

(2)(1)

(3)

Summer Mode


1. Press button for DHW service. The green indicator lamp will light up.2. 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.

Stop and Fault

19

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.

1. Press the Stop button. The boiler will switch to permanent monitoring mode.

(1)

(2)

(1)


(1)

Set Time

20

(2)

Setting the Time1. 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 Day1. 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.


Hydraulic Circuit

21

Expansion VesselFill pressure:10.88 psi/0,75 bar.Butyl diaphragm and nitrogen chargeUseful capacity:1.19 gal (/4.5 litres)

Heat Exchanger6 steps in Heating:

3 for flow and 3 for return

3Primary capacity: 0.08 gal/300 cm3Secondary capacity: 0.07 gal/270 cm

Domestic ColdWater Inlet Pipe

Ø 0.55"/14 mm external

DHW sensor

DHW Outlet PipeØ 0.55"/14 external

Heating Flow pipeØ 0.71"/18 mm external

Heating return pipeØ 0.71"/18 mm external

Heating sensor

Analogic gauge

Circulator3 speed


Overheating safety deviceautomatic resetSet at 221ºF/105 ºC

Lack-of-water pressure switch

Safety Valve

Mini-accumulator0.4 gal/1.5 litres

Fill point valve


Mains Water Inlet

22

Mains waterinlet

Signal to electroniccontrol panel

Flow detectordevice

Fill point valve

Inlet filter

Flow adjustmentscrew


Flow Detector Device

23

Flow meter performance on Laura waterheaters

190(721)

162(612)

148(560)

132(500)

145(550)

158(600)

172(650)

185(700)

198(750)

41(5) 46(8) 52(11) 57(14) 63(17)Temperature ºF (ºC)

Pressure 29 psi/2 bar

Ou

tlet

flo

w r

ate

gal

lon

s (l

itre

s)/h

ou

r


Mini-Accumulator

24

Inlet

Outlet

Capacity: 0.4 gal / 1.5 litres

Insulation: ExpandedPolystyrene (Porex)


Safety Valve and By-Pass

25

Bypass automatic valve

Safety valveSet at 43.5 psi / 3 bar

Flow to radiators

Bypass connectionOpens at 5.8 psi / 0.4 bar

Inlet from heatexchanger


3-way Valve

26

3-way valveTurns in 10 seconds

Flow toradiators

Flow tocylinder Inlet from

heat exchanger

Electricalconnection for3-way valve

Safety valveQuick connect

Set at 43.5 psi / 3 bar

Anti-backdraught valve


Bypass connectionOpens at 5.8 psi / 0.4 bar

Gaug e and Lack-of-Water Pressure Switch

27

Lack-of-water Pressure Switchwith 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 every5 seconds for 3 minutes, will stop for 2 hours,

then will continue beeping for another 3 minutes,after which it will stop for good.

Analogic gauge

Return fromradiators

Connection to pump

Connection to fillpoint valve


Bypass connection

Central Heating Mode Operation

28

Heating sensor

To radiatorsMaximum operating pressure: 43.5 psi / 3 bar

Temperature selectable between86ºF/30ºC and 194ºF/90ºC

Temp. Res. kW

14ºF/10 ºC 55.232ºF/ 0 ºC 32.650ºF/10 ºC 19.968ºF/20 ºC 12.477ºF/25 ºC 10.086ºF/30 ºC 8.06104ºF/40 ºC 5.33122ºF/50 ºC 3.60140ºF/60 ºC 2.49158ºF/70 ºC 1.75176ºF/80 ºC 1.25194ºF/90 ºC 0.91212ºF/100 ºC 0.67230ºF/110 ºC 0.51

Expansion VesselFill pressure:10.88 psi / 0.75 bar.

Butyl diaphragm and nitrogen chargeUseful capacity: 1.19 gal (4,5 litres)

Heat Exchanger6 steps in Heating:

3 for flow and 3for return

3Primary capacity: 0.08 gal/ 300 cm3Secondary capacity: 0.07 gal/ 270 cm

Heating Flow pipeØ 0.71" / 18 mm external


DHW Mode Operation

29

DHW sensor

Temp. Res. kW

86ºF/30 ºC 8.060104ºF/40 ºC 5.330122ºF/50 ºC 3.605140ºF/60 ºC 2.490

Exchanger6 steps DHW

3Primary capacity : 0.08 gal/300 cm3Secondary capacity : 0.07 gal/270 cm

Outlet to draw-off pointsØ 0.55"/14 external

Mains water inlet

Mains inlet pipeØ 0.55"/14 external

Maximum operating pressure: 101.5 psi / 7 bar

Mini-accumulator

Overshooting and scale prevention0” ON, 4’ OFF and 3” ON

Possibility of change acc.To needs

Temperature selectable between86ºF/30ºC and 194ºF/60ºC


30

Overheat Thermostat

Overheat thermostatautomatic reset 221ºF(105ºC)

Open during service Open before light-up

Display of faultcode 14

and red LED

Gas supply cuts off Lockout

Faultcorrected

Faultcorrected

Thermostat reset Thermostat reset

Boiler reset

Press red reset buttom

Press reset buttom

Yes Yes

No No

Operation of the Overheat Thermostat

Service restored

Display of faultcode 06

and red LED

Gas supply cuts off

Press red reset buttom


31

Flame Safeguard Rectification System (I)

Yes

Yes

Yes

No

No

No

Light-up

Boiler reset

Lockout

•End of spark ignition•Service available

Press reset buttom

•End of spark ignition•Safety solenoidvalve closes•Display of fault code 12 and red LED

Call for service (Light-up)

Spark ignition:ignition

electrodes

Safety solenoidvalve opens(gas inlet)

1st solenoidvalve opens

(27,769 Btu/7 Th)

2nd solenoidvalve opens

(47,604 Btu/12 Th)

Attempt tolight up

Fault corrected

Lights upin less than

2 secs.

Service now restored


3 secs.


32

Flame Safeguard Rectification System (II)

Yes

Yes

Si

No

No

No

Light-up

Boiler reset

•End of spark ignition•Service available

Press reset button

•End of sparks ignition•Safety solenoid valve closes•Display of fault code 17 and red LED

Interruption of service

2nd solenoidvalve opens

(47,604 Btu/12 Th)

Light-upprocess

Faultcorrected


Lockout

Attempt to relight

Spark ignition:ignition

electrodes

Safety solenoidvalve opens(gas inlet)

1st solenoidvalve opens

(27,769 Btu/7 Th)


2 secs.


3 secs.


33

Chimney “Pull” Safety 20/20

Lockout (SPOTT triggered)

Boiler reset

Light-up

Stop

Stop

Display of fault code15 and red Led

Display of fault code07 and red LED

Press reset buttom


Waiting for service call

Waiting for service call

Interruption of flue gas removal(insufficient chimney “pull”)

SPOTT safety detectsbackflow of flue gases

Three-minute pausebefore operating

SPOTT automatic reset

Yes

No

NoNo

No

No

Pullrestored

Fault corrected

Calling forservice

Faultcorrected

Si

No

No Stop

Light-up

Wait for service call

Service in operation

Light-up process

SPOTT automaticreset

Call for service

Fault corrected

Faultcorrected

Call forservice

No

Yes

Lockout

Dislay of fault code07 and red LED

Yes

Calling forservice

Yes

No

Actuation while in serviceActuation before light-up

SPOTT safety openbefore light-up

YesYes

Yes

Yes

Locked out again(Spott triggered)


Yes

Yes

Process of Code 22

CHSPT=Tª requiredby user

DHWT>131ºF(64 ºC)

No

CHSPT=122ºF (50 ºC)Tª required by user displayed.Code 22 not displayed.

Before 10'DHWT<131ºF(55 ºC)

No

CHSPT=Tª requiredby user

Yes

Before 10’DHWT>147ºF (64 ºC)

Display: Code 22Red LED flashing and beep-beepCHSPT=140ºF (60ºC) and the usercannot change it

Reset

No

Yes

No

Legend CHSPT=Central Heating Setpoint Temperature CHT= Central Heating Temperature DHWSPT=DHW Setpoint Temperature DHWT= DHW Temperature

Algorithm conditions - Thermostat ON - CH mode enabled - DHW demand OFF

Automatic RESET conditionsof algorithm (while code 22 is not displayed) - If there is demand for DHW - Thermostat OFF - CH mode OFF


Burner

35

Baffle plate

Gas valve pressuretest point bracket

13 becksMaterial: Stainless Steel

Ignition ElectrodesCentered on the middle burner 5 mm higher and

a 4 mm electrode gap

Cable entry bracket plate

Without inter-ignition rods

Burner fixing to thegas valveAllen 4 x 15

Ignition Sequence2 seconds at 27,769 Btu3 seconds at 47,604 Btu

Flame sensing rodAverage current: 3µASafety time period: 5 seconds


Combustion Chamber

36

Front insulation panelMaterial: Ceramic Fibre

Side insulation panelsMaterial: Ceramic Fibre

Side tabsFold them after fittingside insulation panels

Threaded Rods for Chassisfixing M5

Compactcombustion chamber

Do not start the boiler until the insulation panels have been properly assembled. Foroptimum boiler operation it is essential that these insulation panels be in good condition.

M5 Set NutsFor fixing the burner baffle plate


Kit Valve G20 and G25

37

Gas RegulatorOnly in natural gas. Not in LP.Regulation: 6.8:10wc"(17-25 mbar)

Access to governorsettingAllen key 4mm

Operating gas pressuretest point

Gas supply pressure test pointG20 (NG): 6-12 wc" (15-30 mbar)

13 injectorsØ Injector G20: 1.30mmØ Injector G31: 0.75mm

Chassis fixingbracket Allen 4mm

71,412 BtuSolenoid valve. Grey Cable

47,608 Btu Solenoid valve. Orange cable

27,771 Btu Solenoid valve. Blue cable

SafetySolenoid valve. Red cable

Aluminumprofile for burnerinjector holder

Solenoid valve assembly


Allen key 4mmG31 (LP): 14.85 wc" (37 mbar)

Cross-section of Gas Valve

38

Solenoid valve assembly

Solenoid Assembly GasketMaterial: Cork + Nitrile

Gas valve bodyMaterial: Aluminum

Valve gasketMaterial: Cork + Nitrile

13 injectorsØ injector G20:1.30 mmØ injector G31: 0.75 mm

ChassisfixingAllen M5x20

Aluminum profile for burnerinjector holder

Burnerfixing

Self-tappingtri-lobed Allen M5x12

To pressuretest point

71,412 Btu Solenoid valve. Grey cable

Stages of Output bore size(Different diameters acc. to type of gas)

4 disks

47,608 Btu Solenoid valve. Orange cable

27,771 Btu Solenoid valve. Blue cable

SafetySolenoid valve. Red cable


Gas Chang eover Kit


Any adjustments and/or settings must be carried out by a qualified technician

Kit G30 / G31Kit G20 / G25

Natural Gas kit(To convert a Propane/ButaneGas waterheater to Natural Gas)

Propane/Butane Gas Kit(To convert a Natural Gas waterheater

to Propane/Butane Gas)

Flue Components of the Waterheater

40

Pressure Switch. 2 speedSetting range with 9'10"(3 m) of flue duct:

st1 speed: 1.4 mbar (at 27,769 Btu / 7 Th)nd2 speed: 2.05 mbar (at 79,340 Btu / 20 Th)

Should an obstruction occur at low speed,shift to full speed to try to overcome it.

Exhaust fan2 speed

1st speed: R.P.M.:1,900Average current: 0.13 A2nd speed: R.P.M.:2,720Average current: 0.35A

Hood extractor

Pressure switchconnecting pipes

Socket for connectionto specific flue duct

Outlet Ø 2.36" (60)


41

Flue Duct Kit (I)

Kit 140040030-03 for F waterheaters (supplied as standard).


Flue Duct Kit (II)

42

Configuratión C12: Horizontal concentric flue pipe.Flue gases discharged directly into the atmosphere.

Laura 20/20 F

L

Ø 5

"(12

5mm

)

Ø 4"(100mm)

Ø 4

" (1

00 m

m)

L

M


43

Configuratión C42: Horizontal concentric flue pipe connected to twin common shunt or stack.

Laura 20/20 F

L £ 10' (3m)

Ø 4

"(10

0)

L


44

Configuratión C32: Room-sealed waterheater. Vertical concentric flue pipe. Flue gases discharged directly into the atmosphere. Exhaust fan located above the combustion chamber.

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.

Ø 35/16"(100)

Ø 427/32"(125)

LØ 35/16"(100)

Ø 441/64"(118)

L

45/8"(1.4m)< L £ 23'(7m)

Laura 20/20 F

Diaphragm Ø 17/8" (46 mm)


Flue Duct Kit (V)

With no diaphragm With diaphragm

: 7'10"(2.4m) < L £ 36'(11 m) Ø 17/8"(46mm): 4 5/8"(1.4m) < L £ 7'10"(2.4m)

Flue Duct Kit (VII)

45

Each 90°concentric elbow Ø 100/60 o Ø 125/80 reduces 0.7 mEach 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.

M

Ø 100/Ø 125

Ø 100/Ø 125

M

L

L

P

P


Central Heating Programming (I)

46

1. Press the Set Day button. The clock disappears from the LCD display andthe 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.

1234567

(4)

(3)

(2)

(1)

Setting the first scheduled day


47

1234567

(3)

(2)

(1)

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


48

1234567

(3)

(2)

(1)

Central Heating Programming (III)

1. Using the Set Day/Time/Programmer Knob, move the sectors to the timeyou 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.



1234567

(3)

(2)

(1)

Central Heating Programming (IV)

1. Using the Set Day/Time/Programmer Knob, move the sector to the time you wishthe second operating event to start.2. You will notice that as you progress the sectors do not remain lit.3. Press the Validate Program button to store the start of the second event and moveagain the sectors using the Set Day/Time/Programmer Knob until the time you wishthe boiler to switch off for the second time. Press the Validate Program button.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.

Setting the remaining operating events

Laura 20/20F wall-hung waterheaters49

50

Central Heating Programming (V)

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.

(1)

(2)

Setting the programming mode


51

Set-up (I)

Press the Validate Program button (11) for 10 seconds.After this 10-sec time-delay you will access the Set-up mode.

The following screen will be displayed. The flame output can be adjusted with button (13) and the pump time-delay with button (10).

Press the Validate Program button (11) to store the change.

The next screen will displaythe delta T (hysteresis) betweencutoff and restart of flame.Change delta T with button (13).The pump program will be displayed as well on the same screen andcan be changed with button (10).PO = Thermostat activated

Press the Validate Program button (11) to store the change

This screen allows for temperature units (ºC or ºF)to be changed by pressing button (13).


This screen displays the DHWflow rate (litres/h) provided there is consumption. Open a tap to view.Example on display: 527 l/h



3This screen shows the total volume (m ) of DHW usage. Example on display: 1 m3

1 m3 = 264.17 gallons (US liquid)

This screen displays the total operating hours of the safety solenoid on the gas valve.

11

10

13


RECOMMENDED FOR TECHNICIAN ONLY

tto = immediate flamett1 = six minute delay

P1 = continuous operation in CH mode

t1 liter = 0.26 gallons (US liquid)

Set-up (II)

11 10

13

This screen allows the dayto be set using button (13) andthe month with button (10).


This screen allows the yearto be set. To do that, press button(13).Example on display: 2001


This screen displays the value onthe flue gas pressure switch(in mbar x 10).Example on display: 2 mm w.g.


If it is an open flue type waterheater, a29 will be displayed.

Press the Validate Program button (11) for 10 seconds,or any other button on the right-hand of the panel.After that time-delay you will exit the Set-up mode.


RECOMMENDED FOR TECHNICIAN ONLY

Maintenance

53

Carry out the following maintenance operations at least once a year, and preferably at the beginningof the Heating season:DHW•Clean the cold water filter•Check the DHW temperatureHeating•Check the system pressure•Check the waterheater water temperature•Check the pump operation•Bleed the air in the radiators and waterheater•Check the room thermostat•Check the safety valveGas•Check the burner setting pressure•Check the input rate•Check the circuit for gas tightness•Clean the burner VenturisCombustion 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

Clean filter


Fault Codes

54

Designation Nº Fault CodeDHW sensor interrupted 01Heating sensor interrupted 02Lack of pressure in CH circuit 03Faulty flame relay: stuck 04Faulty safety circuit (*) 05Overheat thermostat open during ignition 06Flue spillage limit thermostat open before ignition 07Faulty safety fuse open 08Faulty safety relay (energized) 09Faulty safety relay (will not close following demand) (*) 10Burner off. Ignition time-delay too short 11Burner off for lack of gas at lighting up (*) 12Safety relay. Ignition time-delay too long 13Overheat thermostat open during operation (*) 14Flue gas spillage during operation (*) 15Faulty safety relay. Lack of gas or electrical fault (*) 17Pressure switch opening time-delay 19Pressure switch close time-delay 20Safety relay open during temperature control 21Some hot water tap is dripping (*) 22Faulty communication between micro-panels (electronic noise)(*) 23Faulty internal wiring or bad contact of panel pins 24

(*) Whenever these fault codes appear, reset the waterheater by turning the selector knob to thereset buttom. For the other codes, the waterheater will reset automayically once the fault is cleared.


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. Verify the correct sensor – plug connection 3. Verify that the sensor-cable is correct (not broken or worn out)

Code 03 (40-50-90): Pressure of the heating circuit < 0.5 bar

This happens only in LAURA and SARA boilers, not in VICTORIA. • There is a lack of water in the circuit

1. There is a bad air purge after the first start up and the purged air has dropped the pressure. 2. Manometer failure Remove the broken manometer.

3. Expansion vessel without pressure Empty the heating circuit above the boiler, leave the circuit open and fill up the expansion vessel with an air pump (10.88 psi).

Code 06 (50-60-90): Overheating after flame • The water inside the heat-exchanger exceeds of 221º F The overheating sensor opens after the

flame has estinguished.

1. Due to a bad purge, the air inside the heat exchanger does not allows the water temperature to cool-down.

2. The pump is blocked and the water does not circulates through the heat exchanger. 3. The DHW- flow meter is broken and gives the order to heat up DHW without any real demand. Due to

this, the pump does not turns and the water inside the heat exchanger gets too hot.

Error Codes

55

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.

Code 09 (40-70-90): • Solenoid valve circuit open (gas valves) The circuit connector is loose Insert correctly the

connector. • Broken control panel Change the control panel.

Code 12 (60-70-90): Error in the flame detection at start-up • The control panel does not recieves flame detection during the safety ignition time before the burner

has lighted up (there was no flame before).

1. There is no sparkle between the electrodes in the burner • Check if there is a brocken electrode. • Check if the control panel is broken (you can hardly hear the sparkle inside the control panel)

Change the control panel. 2. No flame detection There is flame but electrodes continue giving sparkles until the safety flame-

up time is exceeded. • Check if the flame-sensor (ionisation-sensor) is broken and replace it. • Check the cable from control panel to the flame-sensor. • If the flame-sensor & cable are ok, replace the control panel. 3. Wrong Gas supply to the burner-becks. • Lack of gas supply Check the gas pressure at inlet regulator (20 mbar) with the boiler working If

no pressure at all, check the gas valve if closed or the main gas supply. • The solenoid valves are not opening Check that solenoid conector at the control panel reads 12 V

DC. If not, change the control panel.

56

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).

Code 19 (40-80-90): Problems at the Pressure-Switch (presostat)

The pressure switch a. The pressure switch is broken Change the pressure switch b. The pressure switch is not properly connected into the right pin-holes

57

Code 20: Problems related to the Exhaust System

If when removing the burner seal panel the boiler works properly, and when replacing it an error occurs, this means there is a problem in the exhaust pipe.

a. Too long exhaust pipe. b. Verify the connection between the 1 meter vent pipes is correct. It might be ok on the outer pipe, but the inner pipe could be loose. This would make the in and out air mix, causing the flame to extinguish due to the lack of oxygen (Code 17) or that the exhaust gases couldn’t escape due th the high loss of the charge produced by this open connector (Code 20).

If the error code 20 comes up continuously, verify that the presostat plastic pipes aren’t connected wrong (in the correct position they should be crossed, where the pipe from the presostat is connected to the Venturi). Blocking of the pipes can also occur, which can be cleared by gently sucking on the pipes.

Outlines Hydraulic (I)


StoppedWay

HeatingWay

Laura 20/20F


Laura 20/20F

Domestic hot water

1) To eliminate the heat fill loop,remove by-pass and cap with caps provided in the connectionmounting bracket & template

2) A 30 psi ASME pressure relief valveis provided to be installed on the

waterheater heating loop side of the unit

3) Apply a traditional backflow preventiondevice on the supply side of the heating loop

Domestic Hot Water; Fill & Backflow Change; 30 psi ASME Relief Valve Outlines Hydraulic (II)

Steve Reed

Steve Reed

Steve Reed

Steve Reed

Steve Reed

Steve Reed

Owner

NOTE: OPEN THE BUILT-IN REGULATOR COMPLETELY TO ACCOMMODATE STANDARD GAS PRESSURES

manual+caldera+roca+laura+20 20f+(ingles)

Documents

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f laura

flaura wall

boilers f

ip44d laura

wall spacing frame4distance

dhw circuit

f electrical protection