Savio GAIA 424 RS User manual

Models:

424 S

428 S

424 RS

Wall hung, fan flue,roomsealed gasboiler

GAIA

Service manual

Leavethismanualadjacent tothe gasmeter

37135 Verona(Italy)

Via LeopoldoBiasi,1

Stabilimento:

33170 Pordenone(Italy)

ViaPravolton,1/B

BIASIS.p.A.

Tableofcontents

1Overall information1.....................

1.1Overall View1.........................

1.2Hydraulicdiagram1....................

2Generalaccess andemptying hydr.circuits2

2.1Nomenclature2........................

2.2Bodypanels2.........................

2.3Access tothe electricpartsofthe

controlpanel3.........................

2.4Access tothesealedchamber3.........

2.5Emptyingthemaincircuit3.............

2.6Emptyingthed.h.w.circuit3............

3Diagrams4..............................

3.1Wiring diagram4.......................

3.2Functionalflowdiagrams5..............

3.3Controlcircuitvoltages7................

4Fault finding8............................

5Mainheat exchanger11....................

5.1Characteristics11.......................

5.2Removal11............................

5.3Cleaning11............................

6D.h.w.heat exchanger12...................

6.1Function12.............................

6.2Removal12............................

7Pump13..................................

7.1Function13.............................

7.2Checks13.............................

7.3Removal13............................

8Divertervalveand d.h.w.pressureswitch14.

8.1Function14.............................

8.2Checks14.............................

8.3Removal14............................

9Electronic controlcircuit 17................

9.1Function17.............................

9.2Selectionandadjustmentdevices17......

9.3Checkingthetemperature17.............

9.4Functionselectors18....................

9.5Ignitiongaspressureregulator19.........

9.6Max.c/hpower regulator19..............

9.7Checks19.............................

9.8Removalofthecontrolcircuit19..........

9.9Thermalcontrolinthe” ” mode21.......

9.10 Thermalcontrolinthe” ” mode21.......

10 Displaycircuit 22..........................

10.1Function22.............................

10.2Displaycircuitoperation22...............

10.3Removal22............................

11 Full sequenceignitiondevice 23............

11.1Function23.............................

11.2Checks23.............................

11.3Removal23............................

11.4Ignitionsequence24....................

12 Gasvalve 25..............................

12.1Function25.............................

12.2Nomenclatureoftheparts25.............

12.3Adjustment25..........................

12.4Checks25.............................

12.5Removal26............................

13 Maincircuit flowswitch27.................

13.1Function27.............................

13.2Checks27.............................

13.3Removal28............................

14 D.h.w.filterandflowlimiter29..............

14.1Generalnotes29........................

14.2Removalofthefilter29...................

14.3Flow limiter29..........................

15 Temperatureprobes30....................

15.1Function30.............................

15.2Checks30.............................

15.3Removal31............................

16 By--pass valve 32.........................

16.1Function32.............................

16.2Removal32............................

17 Waterpressureswitchandpumprelè33....

17.1Function33.............................

17.2Checks33.............................

17.3Removalofthepressureswitch33........

17.4Removalofthepumprelè33.............

18 Flue fan, venturi,airpressureswitch34.....

18.1Function34.............................

18.2Checks34.............................

18.3Removalofthefan35....................

18.4Removalofthe airpressureswitch35.....

19 Ignitionand detectionelectrodes36........

19.1Function36.............................

19.2Checks36.............................

19.3Removal36............................

20 Safetythermostat 37.......................

20.1Function37.............................

20.2Checks37.............................

20.3Removal38............................

21 Shortsparepartslist 40....................

1Overall information

1.1Overall View

Fan

Safety

thermostatprobe

Main heat

exchanger

Burner

Ignition

electrodes

Gasvalve

Control

panel

Combustion

chamber

Automatic

air release

Pump

D.h.w.temp.

probe

D.h.w.

heatexchanger

Expansion

vessel

Gasinlet

C/h

return

C/h

D.h.w.

Detection

electrode

inletoutlet

flow

valve

Maincircuit

flowswitch

D.h.w.temp

probe

Full seq.

ignitiondevice

Divertervalve

Airpressure

switch

FrontviewRearview

fig.1

1.2Hydraulicdiagram

Centralhetaing(c/h) operationDomestichotwater(d.h.w.)operation

C/h

watersupplyC/h

water returnD.h.w.

inletD.h.w.

outlet

fig.2

2Generalaccess andemptying

hydraulic circuits

2.1Nomenclature

fig.3

1Rightsidepanel

2Frontpanel

3Lowerprotectionplate

4Controlpanel

5Caselid

6Leftsidepanel

2.2Bodypanels

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

Forthemostpartofthecheckandmaintenanceoper-

ationsitisnecessarytoremoveoneormorepanelsof

thecase.

Thesidepanelscanberemovedonlyaftertheremoval

ofthefrontpanel.

ToremovethefrontpanelremovethetwoscrewsA

(fig.4)and bringthebaseofthepanelfarfromthe

boiler.

Lift thefrontpanelfreeingitfromthehooksplacedon

itsleftandrightside.

fig.4

ToremovethesidepanelsloosenthescrewsB(fig.5),

bringthebaseofthepanelsfarfromtheboilerandlift

them,freeingthemfromthesidehooksoftheframe.

Toremovethelowerprotectionplatecompletelyun-

screwthescrewsBandremovetheplate(fig.5).

fig.5

Togainaccess tothesupplyterminalblockandtothe

partslocated behindthecontrolpanelunscrewthe

screwsCandlowerthepanel(fig.6).

fig.6

Generalaccess andemptyinghydraulic circuits

2.3Access tothe electricpartsofthecontrol

panel

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

Togainaccess tothepartslocatedinsidethecontrol

panelremovethefourscrewsD(fig.7)andremovethe

coverpullingit towardsthefront.

fig.7

2.4Access tothesealedchamber

Togainaccess tothepartscontainedinthesealed

chamberitisnecessarytoremovethecoverofthe

sealedchamber.

Forthispurpose,removethefrontpanelofthecaseand

removethescrewsEasindicatedinfig.8.

fig.8

2.5Emptyingthemaincircuit

1Closethec/hcircuitisolationvalvesF(fig.9).

fig.9

2OpenthedrainingtapG(fig.10)untiltheboileris

completelyemptied.

fig.10

Tofacilitatethedownflowofwater,removethefront

panel,alsoremovethesealedchambercoverand

loosenthenutH(fig.10)ofthe automaticairbleed

valve.

Tightitagainoncethe emptyinghasbeencompleted.

2.6Emptyingthed.h.w.circuit

1Closethed.h.w.circuitcut---off valveI(fig.11);

2Openoneormorehotwatertapsoftheplantuntil

theboilerhasbeencompletelyemptied.

fig.11

3Diagrams

3.1Wiring diagram

Controlcircuit

COM

NCCOM

NCNC

Displaycircuit

Ignition

electrodesFlamedetection

electrodeShutdown

lamp

Resetpush

button

Safety

thermostat

FanAirpressure

switchWaterpressure

switch

Low limit

(brownplug)

Waterpressure

switch

Highlimit

(red plug)

CirculatorGasvalveCentralheating

pressure

Domestichot

waterpressure

Centralheating

NTC

Domestichot

waterNTCswitchswitch

Electricsupplyconnection

Powerline

Roomthermostat

Timeswitch

br = brown

b=blue

bk=black

w=white

r = red

gy=grey

y=yellow

g/y=green/yellow

*---directconnectionwiththeignitionandflamecontroldevice

type10.81

type10.80

Ignitionandflame

controldevice

br gy

g/y

gy r

rbk

bk b

wbk

g/y

GND

COM

g/y

Pump

relay

w1bk3

Frostat

Diagrams

3.2Functionalflowdiagrams

F2(1,6AT)PTC

J4---1

J3---3J3---2

J4---4

12V=

21V=

General layout

functionswitchpositionoff

TOTHECONTROL

CIRCUIT’SLOW

VOLTAGE

FUNCTION

K1(RELAY)

PUMP

TRANSFORMER

K2(RELAY)

ACTIVECIRCUIT

INACTIVECIRCUIT

L--- LINEN--- NEUTRAL

SECTION

J4---5

J4---6

J3---8J3---7

SWITCH

CENTRALHEATING

PRESSURE

IGNITION

DEVICE

Functionswitchposition

Heatrequestonc/h

F2(1,6AT)PTC

J4---1

J3---3J3---2

12V=

21V=TOTHECONTROL

CIRCUIT’SLOW

VOLTAGE

FUNCTION

K1(RELAY)

PUMP

TRANSFORMER

K2(RELAY)

SECTION

J4---5

J4---6

J3---8J3---7

SWITCH

CENTRALHEATING

PRESSURE

IGNITION

DEVICE

SWITCH

J4---3

ATimeswitch

B:Roomthermostat(jumpershown)

C:Frostat(jumpershown)

J4---4

J4---3

ATimeswitch

B:Roomthermostat(jumpershown)

C:Frostat(jumpershown)

Diagrams

F2(1,6AT)PTC

J4---1

J3---3J3---2

12V=

21V=

Functionswitchposition

Heatrequestond.h.w.

TOTHECENTRAL

CIRCUIT’S

LOWVOLTAGE

FUNCTION

K1(RELAY)

PUMP

TRANSFORMER

K2(RELAY)

ACTIVECIRCUIT

INACTIVECIRCUIT

L--- LINEN--- NEUTRAL

SECTION

J4---5

J4---6

J3---8J3---7

SWITCH

CENTRALHEATING

PRESSURE

IGNITION

DEVICE

Functionswitchposition

Heatrequestond.h.w.

(orgas valve)*

F2(1,6AT)PTC

J4---1

J3---3J3---2

12V=

21V=TOTHECONTROL

CIRCUIT’S

LOWVOLTAGE

FUNCTION

K1(RELAY)

PUMP

TRANSFORMER

K2(RELAY)

SECTION

J4---5

J4---6

J3---8J3---7

SWITCH

CENTRALHEATING

PRESSURE

IGNITION

DEVICE

SWITCH

J4---4

J4---3

ATimeswitch

B:Roomthermostat(jumpershown)

C:Frostat(jumpershown)

J4---4

J4---3

ATimeswitch

B:Roomthermostat(jumpershown)

C:Frostat(jumpershown)

Diagrams

3.3Controlcircuitvoltages

C/h

D.h.w.

temperature

D.h.w.

flowswitch

Modulating

operator

C/h

flowswitch

230 V~

network

Room

thermostat

D.h.w.

Electronic control circuit

230~0

230~

16= 15=

16= 0

230~

Ignition

device

Circulator

Maincircuit

temperature

probe

a: neverzero(shortcircuit)never12V=(opencircuit)

probe

230~

100~

230~

ElectricalvoltagesinVoltsduringnormaloperationwithburneronatmaximumpower

Ignitiondevice

Electronic controlcircuit

Airpressureswitch

Fan

Shut---downlamp

andresetbutton

Electronic controlcircuit

Overheat thermostat

4Fault finding

Components to check

Section of the manual !

(note ref. in brackets) ---

(1) ---

(2) ---

(3) ---

(4) 6 7.2 8.2 9.7 11.2 12.4 13.2 14.2 15.2 16 18.2 19.2 20.2 ---

(7) ---

(8) --- 17

Defect

Powersupplyline

Gas supplyline

Fluepipes

C.h.circuit

D.h.w.circuit

D.h.w.heatexchanger

Pump(windings)

Pump(rotor--- impeller)

Divertervalve(membrane)

Divertervalve(deviationgroup)

D.h.w.pressureswitch

Fuse(regulationp.c.b.)

Regulationp.c.b.

Functionselectors(reg.p.c.b)

Full sequencedevice

Gasvalve(on---off operators)

Gasvalve(modulatingoperator)

Maincircuitflowswitch

D.h.w.filter

Maincircuit temp.probe

D.h.w.temp.probe

By---pass valve

Fanandventuridevice

Airpressureswitch

Ignitionelectrode

Detectionelectrode

Safetythermostat

Injectors

Expansionvessel

Safetyvalve

Waterpressureswitch

Pumprelay

The boiler does not start either in c/h

or d.h.w. mode.

Fan still.

”boiler on”light (green) off.

Lockout lamp (red) off.

J J J

The boiler does not start either in c/h

or d.h.w..mode.

Fan still.

“Boiler on”light (green) on.

Main circuit pressure light green on

Lockout lamp (red) off.

J J J J J J J J

(5) J J J J

The boiler does not start either in c/h

or d.h.w..mode.

Fan still.

“Boiler on”light (green) on.

Main circuit pressure light red on

Lockout lamp (red) off.

J J

Lockout lamp (red) on.

By pressing the reset push---button

the boiler turns on and operates cor-

rectly.

J J

(6) J J

Lockout lamp (red) on.

By pressing the reset push---button

the boiler starts the ignition cycle.

The burner lights on , the ignition

sparks continue and the boiler locks

again.

J J J J J

Lockout lamp (red) on.

By pressing the reset push---button

the boiler starts the ignition cycle.

The burner doesn’t light on , the igni-

tion sparks continue and the boiler

locks again.

J J J J J J J J J

Fault finding

Components to check

Section of the manual !

(note ref. in brackets) 17------

(8)

---

(7)

20.219.218.21615.214.213.212.411.29.78.27.26---

(4)

---

(3)

---

(2)

---

(1)

Defect

Pumprelay

Waterpressureswitch

Safetyvalve

Expansionvessel

Injectors

Safetythermostat

Detectionelectrode

Ignitionelectrode

Airpressureswitch

Fanandventuridevice

By---pass valve

D.h.w.temp.probe

Maincircuit temp.probe

D.h.w.filter

Maincircuitflowswitch

Gasvalve(modulatingoperator)

Gasvalve(on---off operators)

Full sequencedevice

Functionselectors(reg.p.c.b)

Regulationp.c.b.

Fuse(regulationp.c.b.)

D.h.w.pressureswitch

Divertervalve(deviationgroup)

Divertervalve(membrane)

Pump(rotor--- impeller)

Pump(windings)

D.h.w.heatexchanger

D.h.w.circuit

C.h.circuit

Fluepipes

Gas supplyline

Powersupplyline

The boiler runs but the combustion is

noisy and there is flame lift effect. J

Incorrect modulation J J J

The boiler switches on and off the

burner to a fixed gas pressure J J J

The boiler fires on c/h and d.h.w. for a

few seconds, goes off and fires again

constantly.

J J J J J J J J

The fan turns but the boiler does not

turn on. J J J J

The boiler turns off immediately,draw-

ing d.h.w.

Regular functioning in c/h

J J

Noisy boiler J J

With the function switch in summer or

winter mode the boiler turns on even

without drawing the d.h.w. and the

main circuit temperature is kept at

about 90°C.

The pump runs continuously.

The c/h system does not heat.

The boiler operates correctly in d.h.w.

mode.

J J J J

The boiler does not supply d.h.w.

(cold water from the tap).

Regular operation in c/h mode even

during a drawing off d.h.w.

J J J J

On c/h mode the temperature of the

main circuit reaches 90°C and the c/h

system does not heat.

The boiler operates correctly on d.h.w.

mode.

J J J

Fault finding

Components to check

Section of the manual !

(note ref. in brackets) 17------

(8)

---

(7)

20.219.218.21615.214.213.212.411.29.78.27.26---

(4)

---

(3)

---

(2)

---

(1)

Defect

Pumprelay

Waterpressureswitch

Safetyvalve

Expansionvessel

Injectors

Safetythermostat

Detectionelectrode

Ignitionelectrode

Airpressureswitch

Fanandventuridevice

By---pass valve

D.h.w.temp.probe

Maincircuit temp.probe

D.h.w.filter

Maincircuitflowswitch

Gasvalve(modulatingoperator)

Gasvalve(on---off operators)

Full sequencedevice

Functionselectors(reg.p.c.b)

Regulationp.c.b.

Fuse(regulationp.c.b.)

D.h.w.pressureswitch

Divertervalve(deviationgroup)

Divertervalve(membrane)

Pump(rotor--- impeller)

Pump(windings)

D.h.w.heatexchanger

D.h.w.circuit

C.h.circuit

Fluepipes

Gas supplyline

Powersupplyline

The boiler operates correctly but the

gas pressure to the burner remains at

minimum.

J J

Poor d.h.w. temperature J J J J J J

(9)

Low flow rate of d.h.w. J J J

Water leaks from the safety valve dur-

ing operation on c/h J J J J

Water leaks from the safety valve

when the boiler is off. JJJ

Note

1 Check for 220---240V~ between line (L) and neutral (N)

Verify the integrity of supply cable, plug and externalfuses.

Check the polarity of line and neutral connection

2 Verify the soundnessof the gassupply pipe, the position of

stop valves.

Checkthegaspressureattheinlettestpointofthegasvalve

(see sect. 12.3) with the boiler at rest and during operation

and compare it with the values given on the installation

booklet.

3 Check for soundness and absence of obstructions. Verify

that the flue terminal is correctly installed (see clearances)

and ensure that exhaust gas is not sucked back by the

boiler.

4 Checkforsoundnessofthecircuitandverifyitscorrectfilling

(see also installation manual).

5 A jammed by---pass could cause the over---heating of the

main circuit and the intervention of the safety thermostat.

6 Check the minimum gas pressure at the outlet test point of

the gas valve (see sect. 12.3) and compare it with the value

given on the installation booklet.

7 Verify the cleanness of injectors.

8 Check the pressurization of the expansion vessel. Refer to

the installation manual for proper values.

9 d.h.w. pressure too high or flow rate too high. If necessary

insert a flow rate limiter (14.3).

5Main heatexchanger

5.1Characteristics

Themain heatexchanger (Ainfig.12)hasthefunction

oftransferringheatofthegasproduced bycombus-

tiontothewatercirculatinginit.

fig.12

Thehydraulic circuitconsistsof five ellipticpipescon-

nectedtogetherinseries(fig.13).

fig.13

5.2Removal

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

1Emptythemaincircuitoftheboiler

2Removethefrontpanelofthecase

3Removethesealedchambercover.

For models424 S,424 RS...

4aRemovethecoverofthecombustionchamber;

5aRemovethefrontpartofthefluegashood byun-

screwingthescrewB(fig.14a)

BDE

fig.14a

For model428 S...

4bRemovethefrontpartofthefluegashood byun-

screwingthefourscrewsC(fig.14b)

5bRemovethecoverofthecombustionchamber

CDE

fig.14b

6Unscrewthe automaticairvalveconnection nut

Dandremovethevalve(fig.14a);

7Separatetheheatexchangerfromthehydraulic

circuit,looseningtheinletandoutletpipefittings;

For models424 S,424 RS...

8amovetherightpipeandfreetherightconnection;

lowertherightsideofthe exchangerandextract

itfromthefront;

For model428 S...

8bExtract theheatexchanger,fromthefront;

9UnscrewthepipeE(fig.14b)fromtheheatex-

changer;

10 Assembletheheatexchangercarryingoutthere-

movaloperationsinreversesequence.

5.3Cleaning

Ifthere aredepositsofsootordirtbetweentheblades

oftheheatexchanger,cleanwithabrushornon---me-

tallicbristlebrush.

Inanycase,avoidanyactionsthatcandamagethepro-

tectivevarnishwithwhichthe exchangerhasbeencov-

ered.

6D.h.w.heatexchanger

6.1Function

Thed.h.wheatexchanger (Ainfig.15)allowsthein-

stantaneoustransferralofheatfromtheprimaryhy-

draulic circuit tothewaterdestinedford.h.wuse.

fig.15

Theschematicstructureis showninfig.16.

Primaryhydraulic circuit

fig.16

6.2Removal

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

1Emptytheprimarycircuitandthed.h.wcircuitof

theboiler

2Removethefrontpanelofthecase andlowerthe

instrumentpanel

3CompletelyunscrewthetwoAllenkeyscrewsB

(infig.17 therightoneis shown)which holdthe

exchangertothebrass deviatorgroups;

fig.17

4Movethe exchangertowardstherearsideofthe

boilerandextractit.

Reassemblethed.h.w.heatexchangercarryingoutthe

removaloperationsinthereverseorder.

Attention.Reassemblingthe exchangerbesure to

put theoff centerlocation/securing pinindicatedin

fig.18 towardstheleft sideof theboiler.

fig.18

7Pump

7.1Function

Thepump(Ainfig.19)hasthefunctionofmakingthe

waterinthemaincircuitcirculatethroughthemainheat

exchangerandthereforethroughthec/hsystem(dur-

ingthec/hfunction)orthroughthesecondaryheatex-

changer (duringthed.h.w.function).

Note:thepumpcanbestopped bytheinterventionof

thelow limitwaterpressureswitch.

fig.19

7.2Checks

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

nCheckthat thepumpisnotseizedandthat the

movementoftherotorisnotsubject tomechanicalim-

pediments.

Withtheboileroff,removethefrontpanelandlowerthe

instrumentpanel.Removethe air releaseplugofthe

pumpandturntherotorwithascrewdriver.

nCheckthe electricalcompleteness.

Removetheservicepanel,disconnecttheconnectorto

the electronic controlcircuit(see electricaldiagram)

andmeasurethe electricalresistancebetweenthe

pumpsupplyconductors.(fig.20).

Electricalresistanceofthewindings(atambient tem-

perature)onswitchposition3mustbe about:

210 O--- MysonCP53

180 O--- MysonCP63 (high headalternative)

220 O--- SalmsonMYE30

120 O--- SalmsonMYL50 (high headalternative)

g/y

Connector

g/y

fig.20

nCheckthe absenceofstarting defects.

Withtheboileroff removethefrontpanelandlowerthe

controlpanel;

forMysonpump:unscrewtheplugofthepumpbyhand

(theplugcannotberemoved).Pullitandturntherotor.

Start theboilerandverifyifthemotor runs.

forSalmsonpump(high headalternative):removethe

air releasescrewofthepump.Start theboilerandwith

ascrewdriver,havetherotorturninthedirectionofthe

arrow.Ifthereisadefectinstarting,therotorwillbegin

toturn normallyonlystartingitmanually.

nCheckthat theimpellerisintegral withtherotor.

Removethepumpheadloosingthescrewswhichhold

ittothepump bodyandcheckthat theimpellerisfirmly

jointedwiththerotor.

7.3Removal

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

If theclearance totherightsideof theboilerisre-

stricted,theremovalof thepumpcanbe easily

achievedbyfirstremovingtheheadbyunscrewing

the fourAllenkeys screws(Binfig.21,the two on

theuppersideindicated).

1Emptythemaincircuitoftheboiler.

2Removethefrontpanelofthecase,therightside

panelandlowerthecontrolpanel.

3Disconnect theconnectorC(fig.21).

4Completelyunscrewtheconnection nutsDand

removethepump.

5Beforethereassembling,carefullycleanthesup-

portseatofthegasket.

6Reassemblethepumpcarryingout theremoval

operationsinthereverseorder.

fig.21

8Divertervalve and d.h.w.

pressureswitch

8.1Function

Thedivertervalve(Ainfig.22)hasthefunctionofmod-

ifyingthehydraulic circuitoftheboilerbymeansofan

hydraulic command givenbytheopeningofad.h.w.

tapinordertosendthewaterthatexitsthemain heat

exchangertowardsthec/hsystemortowardsthe

d.h.w.heatexchanger.

Moreoveritoperatesthed.h.w.pressureswitchwhich

actsonthe electronic controlcircuit.

fig.22

8.2Checks

nGeneralcheck

Itispossibletoverifythegeneraloperationofthevalve

bymeasuringthevoltagebetweentheleadsofthe

d.h.w.pressureswitchduringtheoperationonc/hand

d.h.w.

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

1Switchoff theboilerandopenthecontrolpanel.

2Connectameter,setfordirectvoltagemeasure-

ment,tothepointsindicatedinfig.23.

3Switchtheboileronpositionandverifythevolt-

agesduringc/handd.h.w.bymatchingtheread-

ingswiththevaluesindicatedinthesection3.3.

fig.23

nCheckthemechanicalfunction

1Switchofftheboiler;removethefrontpanelofthe

case,thelowerprotectionplate andlowerthe

controlpanel.

2Removethepressureswitchasexplainedinthe

section8.3“Removalof the switch“.

3Openandclosead.h.w.tapandverifytheposi-

tionoftheshaftBreferringtofig.24.

D.h.w.tapOPEN

D.h.w.tapCLOSED

fig.24

8.3Removal

Warning:isolate theboilerfromthemains

electricitysupplybeforeremovingany

covering orcomponent.

nRemovalofthemembrane

1Removethefrontpanelofthecase,lowerthecon-

trolpanelandemptythed.h.w.circuit.

2RemovetheforksCandmove awaythepipesD.

(fig.25 --- rearviewoftheboiler).

Divertervalveand d.h.w.pressureswitch

fig.25

3LoosethescrewsEandremovethehydraulic

actuatorF(fig.26).

fig.26

4UnscrewthesixscrewsG,openthehydraulic

actuatorandremovethemembraneH.(fig.27).

fig.27

5Assemblethepartproceedinginreverseorder.

Assemblingthepart,ensure to place theconcave

sideof themembrane towardstheactuatorplate I

(fig.27).

Whenfixingtheactuatortothevalve,fit therefer-

enceshaft Jintheseatof thevalve(fig.28).

fig.28

nRemovaloftheswitch

1Switchofftheboiler;removethefrontpanelofthe

case,thelowerprotectionplate andlowerthe

controlpanel.

2RemovetheforkKthatholdsthed.h.w.pressure

switchLplacedontherightsideofthevalve and

removetheswitch(fig.29).

3Opentheboxand disconnect theswitch.

4Reassembletheswitchproceedinginthereverse

order.

fig.29

nRemovalofthevalve andthedivertermechanism

1Switchofftheboiler;removethefrontpanelofthe

case,thelowerprotectionplate andlowerthe

controlpanel.

2Drainthed.h.w.andthec/hcircuits.

3Completelyloosentheconnectionstothehy-

draulic circuitsindicatedinfig.30.

Divertervalveand d.h.w.pressureswitch

fig.30

4RemovetheforksMandmove awaythepipesN

(fig.31).

fig.31

5Removetheforksthatholdthed.h.w.pressure

switchOandthemaincircuitflowswitchPand

separatetheswitchesfromthevalve(fig.32).

6Disconnect thetemperatureprobeQ.

fig.32

7UnscrewthescrewRthatholdsthed.h.w.heat

exchanger,theboltSthatholdsthevalvetothe

frame(fig.33)andremovethevalve.

fig.33

Thedivertermechanismiscomposed bytwoparts.To

reachthemremovethehydraulicactuatorasexplained

atthestep3ofthepartRemovalofthemembraneofthis

chapter.

Withasuitablespannerunscrewbothplugsindicated

infig.34 andremovethepartsofthedivertermechan-

ism.

fig.34

Reassemblethevalveproceedinginthereverseorder.

Savio GAIA 424 RS, GAIA 424 S, GAIA 428 S User manual

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