Ariston t2 lls 23 mffi инструкция

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Личный
кабинет

• InstallationInstructionsType C BoilersG.C.N: 47-116-16

  LEAVE THESE INSTRUCTIONSWITH THE END-USER

  Country of destination: GB

• 2TABLE OF CONTENTS 1. GENERAL INFORMATION1.1 GENERAL
  INSTRUCTIONS1.2 OVERALL VIEW

  2. INSTALLATION

  2.1 REFERENCE STANDARDS2.2 SITING THE APPLIANCE2.3 OVERALL
  DIMENSIONS2.4 CLEARANCES2.5 MOUNTING THE APPLIANCE2.6 ELECTRICAL
  CONNECTION2.7 GAS CONNECTION2.8 WATER CONNECTIONS2.9 FLUE
  CONNECTION2.10 ROOM THERMOSTAT CONNECTION2.11 ELECTRICAL/SYSTEM
  DIAGRAMS2.12 WATER CIRCUIT DIAGRAM

  3. COMMISSIONING

  3.1 INITIAL PREPARATION3.2 CONTROL PANEL3.3 REMOVING THE FRONT
  PANEL3.4 INITIAL START UP3.5 OPERATIONAL ADJUSTMENTS3.6 COMBUSTION
  ANALYSIS3.7 FUME DISCHARGE MONITORING3.8 BOILER SAFETY SYSTEMS3.9
  DRAINING THE SYSTEM

  4. GAS ADJUSTMENTS

  GAS ADJUSTMENT TABLE4.1 CHANGING THE TYPE OF GAS

  5. MAINTENANCE

  6. MISCELLANEOUS

  6.1 WIRING DIAGRAM FOR TWO HEATING ZONES6.2 WIRING DIAGRAM FOR
  CONNECTION TO AN ARISTON UNVENTED CYLINDER

  7. TECHNICAL INFORMATION

• This manual is an integral and essential part of the product. It
  should be keptwith the appliance so that it can be consulted by the
  user and our authorisedpersonnel.

  Please carefully read the instructionsand notices about the unit
  contained inthis manual, as they provide importantinformation
  regarding the safeinstallation, use and maintenance ofthe
  product.

  For operating instructions pleaseconsult the separate Users
  Manual.

  Read the instructions and recommendations in these Installation
  Instructionscarefully to ensure proper installation, use and
  maintenance of the appliance.Keep this manual in a safe place. You
  may need it for your own reference whileour Servicing Centre
  technicians or your installer may need to consult it in
  thefuture.This is a combined appliance for the production of
  central heating (C.H.) anddomestic hot water (D.H.W.).This
  appliance must be used only for the purpose for which it is
  designed.The manufacturer declines all liability for damage caused
  by improper ornegligent use.No asbestos or other hazardous
  materials have been used in the fabrication ofthis product.Before
  connecting the appliance, check that the information shown on the
  dataplate and the table in section 7 comply with the electric,
  water and gas mains ofthe property.You will find the data plate on
  the reverse of the control panel.The gas with which this appliance
  operates is also shown on the label at thebottom of the boiler.Do
  not install this appliance in a damp environment or close to
  equipmentwhich spray water or other liquids.Do not place objects on
  the appliance.Do not allow children or inexperienced persons to use
  the appliance withoutsupervision.If you smell gas in the room, do
  not turn on light switches, use the telephone orany other object
  which might cause sparks.Open doors and windows immediately to
  ventilate the room.Shut the gas mains tap (at or adjacent to the
  gas meter) or the valve of the gascylinder and call your Gas
  Supplier immediately.If you are going away for a long period of
  time, remember to shut the mains gastap or the gas cylinder
  valve.Always disconnect the appliance either by unplugging it from
  the mains orturning off the mains switch before cleaning the
  appliance or carrying outmaintenance.In the case of faults or
  failure, switch off the appliance and turn off the gastap. Do not
  tamper with the appliance.For repairs, call your local Authorised
  Servicing Centre and request the use oforiginal spare parts. For
  in-guarantee repairs contact MTS (GB) Limited.Check the following
  at least once a year:1 — Check the seals for the water connections;
  replace any faulty seals.2 — Check the gas seals; replace any
  faulty gas seals.3 — Visual check of the entire unit.4 — Visual
  check of the combustion process or analysis of combustion by-

  products (see section 3.6) and cleaning of the burner if
  needed.

  1. GENERAL INFORMATION

  3

  1.1 GENERAL INSTRUCTIONS

• 45 — If called for by point. 3, dismantling and cleaning of the
  combustionchamber.

  6 — If called for by point. 4, dismantling and cleaning of the
  burner jets.7 — Visual check of the primary heat exchanger:

  — check for overheating in the blade assembly;- clean the
  exhaust fan if needed.

  8 — Adjustment of the flow rate of the gas: flow rate for
  lighting, partial load andfull load.

  9 — Check of the heating safety systems:- safety device for
  maximum temperature (overheat thermostat);- safety device for
  maximum pressure (safety valve).

  10- Check of the gas safety systems:- safety device for lack of
  gas or flame ionisation (detection electrode);- safety device for
  gas cock.

  11- Check of the electrical connection (make sure it complies
  with the instructionsin the manual).

  12- Check of domestic hot water production efficiency (flow rate
  and temperature)13- General check of the combustion by-products of
  the discharge/ventilation

  system.14- Check of the general performance of the unit.

  LEGEND:

  1. Flue connector2. Air intake for twin pipe flue systems3.
  Fan4. Combustion chamber hood5. Twin-pass heat exchanger6. Domestic
  hot water temperature probe7. Combustion chamber8. Combustion
  chamber insulation panel9. Burner10. Detection electrode11.
  Ignition electrodes12. Gas valve13. Spark generator14. Pump
  pressure switch15. Safety valve (3 bar)16. Automatic By-pass17.
  D.H.W. Flow switch18. Domestic hot water inlet filter19.
  Circulation pump with automatic air release valve20. Safety
  thermostat21. Main circuit temperature probe22. Expansion vessel23.
  Air pressure switch 24. Combustion analysis points

  1.2 OVERALL VIEW

  FIG. 1.0

  IN016A

• 5The technical information and instructions provided herein
  below areintended for the installer so that the unit may be
  installed correctly andsafely.

  The installation and initial start up of the boiler must be by a
  CORGIRegistered Installer in compliance with the installation
  standards currently ineffect, as well as with any and all local
  health and safety standards i.e..CORGI .

  This appliance must be installed by a competent installer
  inaccordance with current Gas Safety (installation &
  use)Regulations.

  The installation of this appliance must be in accordance with
  the relevantrequirements of the current Gas Safety (installation
  & use) Regulations, theLocal Building Regulations, the current
  I.E.E. Wiring Regulations, thebyelaws of the local water authority,
  and in Scotland, in accordance with theBuilding Standards
  (Scotland) Regulation and Health and Safety documentNo. 635
  Electricity at work regulations 1989.Installation should also
  comply with the following British Standard Codes ofPractice:

  The appliance may be installed in any room or indoor area,
  althoughparticular attention is drawn to the requirements of the
  current I.E.E. WiringRegulations, and in Scotland, the electrical
  provisions of the BuildingRegulations applicable in Scotland, with
  respect to the installation of thecombined appliance in a room
  containing a bath or shower.Where a room-sealed appliance is
  installed in a room containing a bathor shower the appliance and
  any electrical switch or appliance control,utilising mains
  electricity should be situated so that it cannot betouched by a
  person using the bath or shower.The location must permit adequate
  space for servicing and air circulationaround the appliance as
  indicated in paragraph 2.4.The location must permit the provision
  of an adequate flue and termination.For unusual locations special
  procedures may be necessary.BS 6798-1987 gives detailed guidance on
  this aspect.A compartment used to enclose the appliance must be
  designed specificallyfor this purpose. No specific ventilation
  requirements are needed for theinstallation within a cupboard.This
  appliance is not suitable for outdoor installation.

  The type C appliances (in which the combustion circuit, air vent
  intakeand combustion chamber are air-tight with respect to the room
  inwhich the appliance is installed) can be installed in any type of
  room.Secondary ventilation is not required with this boiler. The
  boiler must beinstalled on a solid, permanent wall to prevent
  access from the rear.

  2.1 REFERENCE STANDARDS

  2. INSTALLATION

  2.2 SITING THE APPLIANCE

  BS 7593:1992 Treatment of water in domestic hot water central
  heating systems

  BS 5546:1990 Installation of hot water supplies for domestic
  purposes

  BS 5440-1:1990 FluesBS 5440-2:1989 Air supplyBS 5449:1990 Forced
  circulation hot water systemsBS 6789:1987 Installation of gas fired
  hot water boilers of rated

  input not exceeding 60kWBS 6891:1989 Installation of low
  pressure gas pipe up to 28mmBS 7671:1992 IEE wiring regulationsBS
  4814:1990 Specification for expansion vesselsBS 5482:1994
  Installation of LPG

• For safety purposes, have a competent person carefullycheck the
  electr ical system in the proper ty, as themanufacturer will not be
  held liable for damage caused bythe failure to earth the appliance
  properly or by anomaliesin the supply of power. Make sure that the
  residentialelectrical system is adequate for the maximum
  powerabsorbed by the unit, which is indicated on the rating
  plate.In addition, check that the section of cabling is
  appropriatefor the power absorbed by the boiler.

  The boiler operates with alternating current, as indicated inthe
  technical information table in section 6, where themaximum absorbed
  power is also indicated. Make surethat the connections for the
  neutral and live wirescorrespond to the indications in the diagram.
  Theappliance electrical connections are situated on thereverse of
  the control panel (see the servicing manual forfurther
  information)

  IMPORTANT!In the event that the power supply cord must be
  changed,replace it with one with the same specifications. Make
  theconnections to the terminal board located within thecontrol
  panel, as follows:- The yellow-green wire should be connected to
  theterminal marked with the symbol; make sure to re-use the grommet
  mounted on the other supply cord;- The blue wire should be
  connected to the terminalmarked N;- The brown wire should be
  connected to the terminalmarked L.

  6

  Fasten the boiler in place using the template and
  anchorssupplied with the unit. It is highly recommended that
  aspirit level be used to position the boiler so that it isperfectly
  level.For additional information, please consult the
  instructionscontained in the connection kit and the flue kit.

  2.6 ELECTRICAL CONNECTION

  2.5 MOUNTING THE APPLIANCE

  250

  LEGEND:

  A = Central Heating Flow (3/4)B = Domestic Hot Water Outlet
  (1/2)C = Gas Inlet (3/4)D = Domestic Cold Water Inlet (1/2)E =
  Central Heating Return (3/4)

  2.3 OVERALL DIMENSIONS

  In order to allow for access to the interior of the boiler
  formaintenance purposes, the boiler must be installed incompliance
  with the minimum clearances indicated in FIG. 2.2

  2.4 CLEARANCES

  FIG. 2.1

  FIG. 2.2

  FIG. 2.3

  QT002A

  DM001A

  VR001A

• VIEW OF THE BOILER CONNECTIONS

  LEGEND:

  A = Central Heating FlowB = Domestic Hot Water OutletC = Gas
  InletD = Domestic Cold Water InletE = Central Heating ReturnF =
  Safety Valve

  CENTRAL HEATINGDetailed recommendations are given in BS
  6798:1987 and BS 5449-1:1990,the following notes are given for
  general guidance.

  2.8 WATER CONNECTIONS

  2.7 GAS CONNECTION The local gas region contractor connects the
  gas meter to the service pipe.If the gas supply for the boiler
  serves other appliances ensure that anadequate supply is available
  both to the boiler and the other applianceswhen they are in use at
  the same time.Pipe work must be of an adequate size. Pipes of a
  smaller size than theboiler inlet connection should not be
  used.

  7

  Note: The diagrams for the electrical system are indicated in
  section 2.11.

  Warning, this appliance must be earthed.External wiring to the
  appliance must be carried out by a competent personand be in
  accordance with the current I.E.E. Regulations and applicablelocal
  regulations. The microCombi is supplied for connection to a 230
  V~50 Hz supply.The supply must be fused at 3 A.The method of
  connection to the electricity supply must facilitate
  completeelectrical isolation of the appliance, by the use of a
  fused double poleisolator having a contact separation of at least 3
  mm in all poles oralternatively, by means of a 3 A fused three pin
  plug and unswitchedshuttered socket outlet both complying with BS
  1363.The point of connection to the Electricity supply must be
  readily accessibleand adjacent to the appliance unless the
  appliance is installed in a bathroomwhen this must be sited outside
  the bathroom (see section 2.2).

  FIG. 2.4

  FIG. 2.5

  KT003A

  SC005A

  FF

• 8VR003ARES

  IDUA

  LH

  EAD

  OF

  THE

  BO

  ILER

  PIPE WORK:Copper tubing to BS EN 1057:1996 is recommended for
  water pipes.Jointing should be either with capillary soldered or
  compression fittings.Where possible pipes should have a gradient to
  ensure air is carriednaturally to air release points and water
  flows naturally to drain taps.The appliance has a built-in
  automatic air release valve, however it shouldbe ensured as far as
  possible that the appliance heat exchanger is not anatural
  collecting point for air.Except where providing useful heat, pipes
  should be insulated to preventheat loss and avoid
  freezing.Particular attention should be paid to pipes passing
  through ventilatedspaces in roofs and under floors.BY-PASS:The
  appliance includes an automatic by-pass valve, which protects the
  mainheat exchanger in case of reduced or interrupted water
  circulation throughthe heating system, due to the closing of
  thermostatic valves or radiators.SYSTEM DESIGN:This boiler is
  suitable only for sealed systems.DRAIN COCKS:These must be located
  in accessible positions to permit the draining of thewhole system
  and should be fitted at all low points. The taps must be at
  least15mm nominal size and manufactured in accordance with BS
  2870:1980.SAFETY VALVE DISCHARGE:The discharge should terminate
  facing downward on the exterior of thebuilding in a position where
  discharging (possibly boiling water & steam) willnot create
  danger or nuisance, but in an easily visible position, and notcause
  damage to electrical components and wiring.The discharge must not
  be over an entrance or a window or any other typeof public
  access.AIR RELEASE POINTS:These must be fitted at all high points
  where air naturally collects and mustbe sited to facilitate
  complete filling of the system.The appliance has an integral sealed
  expansion vessel to accommodate theincrease of water volume when
  the system is heated.It can accept up to 6 litres (1.3 gal) of
  expansion water. If the heating circuithas an unusually high water
  content, calculate the total expansion and addan additional sealed
  expansion vessel with adequate capacity. This shouldbe located on
  the return pipe work as close as possible to the pump inlet.MAINS
  WATER FEED — CENTRAL HEATING:There must be no direct connection to
  the mains water supply even througha non-return valve, without the
  approval of the Local Water Authority.FILLING:A temporary method
  for initially filling the system and replacing lost waterduring
  servicing in accordance with current Water Regulations and
  Byelawsmust be provided.

  DOMESTIC WATERThe domestic water must be in accordance with the
  relevantrecommendation of BS 5546:1990. Copper tubing to BS EN
  1057:1996 isrecommended for water carrying pipe work and must be
  used for pipe workcarrying drinking water.

• 60/100 mm

  FIG. 2.7

  A

  BC

  D

  E

  F

  G

  J

  K

  HI

  L

  GF

  The boiler is designed to be connected to a coaxial flue
  discharge system.

  9

  2.9 FLUE CONNECTIONS FLUE SYSTEMThe provision for satisfactory
  flue termination must be made in accordancewith BS 5440-1.The
  appliance must be installed so that the flue terminal is exposed to
  outside air.The terminal must not discharge into another room or
  space such as anouthouse or lean-to.It is important that the
  position of the terminal allows a free passage of airacross it at
  all times.The terminal should be located with due regard for the
  damage ordiscolouration that might occur on buildings in the
  vicinity.In cold or humid weather water vapour may condense on
  leaving the flueterminal.The effect of such pluming must be
  considered.If the terminal is less than 2 metres above a balcony,
  above ground or abovea flat roof to which people have access, then
  a suitable terminal guard mustbe fitted. When ordering a terminal
  guard, quote the appliance modelnumber.A suitable terminal guard is
  available from:TOWER FLUE COMPONENTSMorley RoadTonbridgeKent TN9
  1RAThe minimum acceptable spacing from the terminal to obstructions
  andventilation openings are specified in FIG. 2.6.

  TERMINAL POSITION mm

  A — Directly below an openable window or other opening 300B —
  Below gutters, solid pipes or drain pipes 75C — Below eaves 200D —
  Below balconies or car-port roof 200E — From vertical drain pipes
  and soil pipes 75F — From internal or external corners 300G — Above
  ground or balcony level 300H — From a surface facing a terminal
  600I — From a terminal facing a terminal 1200J — From an opening in
  the car port

  (e.g. door, window) into dwelling 1200K — Vertically from a
  terminal in the same wall 1500L — Horizontally from a terminal in
  the same wall 300

  FIG. 2.6FU010A

  FU003A

  FU002A

• 80 mm

  The components marked * in FIG 2.9 are present or
  absentdepending on the type of flue system used by the
  installer.

  In addition, it is also possible to use a split (twin
  pipe)system by fitting a special adaptor to the flue connectorand
  using the aperture for the air vent intake located onthe top part
  of the combustion chamber.To utilise the air intake it is necessary
  to:1. Remove the bottom of the air intake by cutting it with
  asuitable knife (see FIG. 2.8);2. Insert the elbow into the air
  intake until it reaches thelower end. (There is no need to use
  gaskets or sealingcompounds).

  10

  IMPORTANT!

  For all flue systems, a restrictormay be be inserted into
  theboilers flue connector; therestrictor must be 43 indiameter
  depending on the lengthof piping indicated in TABLE 2.1.

  FIG 2.10 and FIG 2.11 i l lustratesome of the various designs
  forcoaxial or twin pipe flue systems.For fur ther information
  ondischarge/ventilation accessories,see the FLUE PIPE
  ACCESSORIESMANUAL.

  COAXIAL SYSTEMS

  FIG. 2.8

  FIG. 2.9

  FIG. 2.10

  FU005A

  FU006A

  FU004A

  FU001A

• TWIN PIPESYSTEMS

  FIG. 2.11

  In calculating the lengths of the pipes, themaximum length L
  must also take intoconsideration the values for theexhaust/air
  intake end terminals, as wellas 90 elbows for coaxial systems.The
  C52 types must comply with the

  following requirements:1 — The exhaust/air intake pipes must

  have the same diameter of 80 mm.2 — If elbows are to be inserted
  into the

  air intake and/or exhaust system, thecalculation of the overall
  length musttake into consideration the values foreach elbow, see
  the FLUE PIPEACCESSORIES MANUAL.

  3 — The exhaust pipe must protrude by atleast 0.5 m above the
  top of the roofin the event that it is located on theopposite side
  of the building to theside with the air intake (this conditionis
  not obligatory when the air intakeand exhaust are located on the
  sameside of the building).

  ExhaustType

  C12 (xy)

  C32 (xy)

  C42 (xy)

  C52 (xy)

  C82 (xy)

  Restrictor 43 mm

  L max = 11.5 m

  L max = 11.4 m

  MaximumExtensionExhaust/Air

  43 m

  43 m

  43 m

  40 m

  NO Restrictor

  L min = 11.5 m

  L max = 43 m

  L min = 11.4 m

  L max = 40 m

  Risk of Condensation Forming

  Twin PipeSystems 80/80

  Piping not insulated 43 restrictor NO

  4.3 m 6.9 m

  4.3 m 6.9 m

  Piping insulated 43 restrictor NO

  NONE NONE

  5.7 m 21.7 m

  L = Sum of the total length of exhaust + air intake piping.

  11

  ExhaustType

  C12 (xx)

  C32 (xx)

  C42 (xx)

  Restrictor 43 mm

  L min = 0.5 mL max = 2 m

  MaximumExtensionExhaust/Air

  L = 4 m

  NO Restrictor

  L min = 2 mL max = 4 m

  Risk of Condensation Forming

  CoaxialSystems 60/100

  Piping not insulated 43 restrictor NO

  NONE NONE

  Piping insulated 43 restrictor NO

  NONE NONE

  TABLE 2.123 MFFI

  FU007A

• 12

  To connect a room thermostat, it is necessary to:

  1. — Open the control panel as indicated in section 3.3.2.-
  Remove the link A from the terminal block on the reverse of the
  control panel.3. — Insert the thermostat cable through the cable
  grommet and fasten it by means of the

  cable-clamp provided.4. — Then connect the thermostat wires to
  the terminal block.5.- If a remote time clock is to be fitted,
  disconnect the integral time clock from the P.C.B.6. — Using a
  volt-free switching time clock, connect the switching wires from
  the time clock

  following points 1-4 above.7. — If using an external time clock
  and room thermostat, these must be connected in

  series as points 1-7 above.

  Note: Only a two-wire type room thermostat can be used.

  An anti-frost device is built-in to the appliances electronic
  regulation system.

  2.10 ROOM THERMOSTATCONNECTION

  A

  2.11 ELECTRICAL/SYSTEMDIAGRAMS

  LEGEND:

  A = Central Heating Temperature AdjustmentB = Domestic Hot Water
  Temperature AdjustmentC = Soft-light AdjustmentD = Maximum Heating
  AdjustmentE = Time Clock ConnectorF = On/Off SwitchG = Fume Sensor
  L.E.D.H = Central Heating SelectorI = Ignition Failure (Lockout)
  L.E.D.J = On/Off L.E.D.K = Reset ButtonL = Central Heating L.E.D.M
  = TransformerN = Circulation Pump RelayO = Fan RelayP = Gas Valve
  RelayQ = Spark Generator I.C.

  A01 = Circulation PumpA02 = FanA03 = Spark Generator/Gas Valve
  SupplyA04 = Flame Detection CircuitA05 = Detection ElectrodeA06 =
  Main Circuit Temperature ProbeA07 = Domestic Hot Water Temperature
  ProbeA08 = D.H.W. Flow switchA09 = Pump Pressure SwitchA10 =
  ModulatorA11 = Air Pressure SwitchA12 = Safety ThermostatA13 =
  External (Room) Thermostat

  Colours:Gry = Grey Wh = WhitePnk = PinkBrn = BrownBl = BlueBlk =
  BlackRd/Blk = Red/Black

  FO016A FO017A

• FIG. 2.13

  13

  FIG. 2.12SE016A

  SF013A

• 14

  LEGEND:

  1. Fan2. Twin-pass Heat Exchanger3. Domestic Hot Water
  Temperature Probe4. Burner 5. Detection Electrode6. Ignition
  Electrodes7. Gas Valve8. Pump pressure switch9. Safety Valve10.
  D.H.W. inlet filter11. D.H.W. Flow Switch12. Automatic By-pass13.
  Pressure Gauge14. Circulation Pump with Automatic Air Release
  Valve15. Overheat Thermostat 16. Main Circuit Temperature Probe17.
  Expansion Vessel18. Air Pressure Switch

  A. Central Heating FlowB. Domestic Hot Water OutletC. Gas
  InletD. Domestic Cold Water InletE. Central Heating Return

  2.12 WATER CIRCUIT DIAGRAM

  FIG. 2.14

  SI016A

• 15

  MTS (GB) Limited support the initiative. Within the information
  packyou will find a copy of the logbook. It is important that this
  iscompleted in the presence of your customer, they are shown how to
  use it,and it is signed by them. Please instruct your customer that
  they must havetheir logbook with them whenever they contact a
  service engineeror us.

  Preliminary electrical system checks to ensure electrical safety
  must becarried out by a competent person i.e. polarity, earth
  continuity, resistance toearth and short circuit.

  FILLING THE HEATING SYSTEM:Lower the control panel and remove
  the case panels (see section 3.3 forfurther information).Open the
  central heating flow and return cocks supplied with theconnection
  kit (there are two isolation points on the return
  connection).Unscrew the cap on the automatic air release valve one
  full turn and leaveopen permanently.Close all air release valves on
  the central heating system.Gradually open valve(s) at the filling
  point (filling-loop) connection to thecentral heating system until
  water is heard to flow, do not open fully.Open each air release tap
  starting with the lowest point and close themonly when clear water,
  free of air, is visible.Purge the air from the pump by unscrewing
  anticlockwise andremoving the pump plug and also manually rotate
  the pump shaft inthe direction indicated by the pump label to
  ensure the pump is free.Refit the pump plug.Continue filling the
  system until at least 1.5 bar registers on the
  pressuregauge.Inspect the system for water soundness and remedy any
  leaksdiscovered.

  FILLING OF THE D.H.W. SYSTEM:Close all hot water draw-off
  taps.Open the cold water inlet cock supplied with the connection
  kit.Open slowly each draw-off tap and close them only when clear
  water, freeof bubbles, is visible.

  GAS SUPPLY:Inspect the entire installation including the gas
  meter, test for soundnessand purge the supply as described in BS
  6891:1988.Open the gas cock (supplied with the connection kit) to
  the appliance andcheck the gas connections on the appliance for
  leaks.

  When the installation and filling are completed turn on the
  central heatingsystem (section 3.4) and run it until the
  temperature has reached the boileroperating temperature. The system
  must then be immediately flushedthrough.The flushing procedure must
  be in line with BS 7593:1992 code of practicefor treatment of water
  in domestic hot water central heating systems.During this
  operation, we highly recommend the use of a central heatingflushing
  detergent (Fernox Superfloc or equivalent), whose function is
  todissolve any foreign matter that may be in the system.Substances
  different from these could create serious problems to thepump or
  other components.The use of an inhibitor in the system such as
  Fernox MB-1 or equivalent isstrongly recommended to prevent
  corrosion (sludge) damaging the boilerand system.Failure to carry
  out this procedure may invalidate the appliancewarranty.

  3. COMMISSIONING

  3.1 INITIAL PREPARATION

• In order to access the inside of the boiler, it is necessary to
  unscrewthe fastening screws A of the control panel located on the
  lower partof the panel itself.The control panel moves downward and
  when pulled forward rotateson two lateral hinges.The panel stays in
  a semi-horizontal position, which allows access tothe inner parts
  of the boiler.In order to increase the manoeuvring space, it is
  possible to raise thecontrol panel and rotate it to a fully
  horizontal position.

  16

  3.3 REMOVING THEFRONT PANEL

  B

  1

  2

  3

  4

  5

  A

  LEGEND:

  A — On/Off buttonB — Central heating temperature adjustmentC —
  Domestic hot water temperature adjustmentD — Heating system
  pressure gaugeE — Time clockF — Central heating selectorG — Central
  heating L.E.D. (green)H — Fume sensor L.E.D. (yellow)I — Overheat
  and/or ignition failure (lockout) L.E.D. (red)J — Ignition failure
  (lockout) and/or overheat reset buttonK- ON/OFF L.E.D. (green)

  3.2 CONTROL PANEL

  FIG. 3.1

  To dismantle the frontcasing panel it is necessaryto:1 — Remove
  the two screws

  B;2 — Move the front casing

  panel up and lift forward.

  FR019A

• 17

  3.4. INITIAL START-UP

  To access the areas in which adjustments are made, it is
  necessary to openthe control panel, as indicated in section 3.3,
  then remove the rearinspection cover by unscrewing the two screws.
  Access is thereby providedto the P.C.B. and to the following
  components:1. the power supply cable connector;2. the fuses;3. the
  soft-light potentiometer, the setting for which, can range from
  the

  minimum thermal power to the maximum;4. the maximum thermal
  heating power potentiometer adjustable by the

  minimum to maximum power (already calibrated in the factory to
  70% ofthe maximum thermal power);

  5. the time clock connector.

  THE CHECKS TO BE RUN BEFORE INITIAL START-UP ARE AS FOLLOWS:1.
  Make sure that:

  — the screw on the automatic air valve has been loosened when
  thesystem is full;

  — If the water pressure in the system is below 1.5 bar, bring it
  up to theappropriate level;

  -Ensure that the gas cock is closed;-Make sure that the
  electrical connection has been made properly and

  that the earth wire is connected to an efficient earthing
  system;- Supply power to the boiler by pushing the On/Off button A
  (see FIG.

  3.1) — the L.E.D. K will illuminate. Then push the button F in
  forcentral heating — the L.E.D. G will illuminate. This will start
  thecirculation pump. After 7 seconds, the boiler will signal a
  shutdown dueto ignition failure. Leave the boiler as it is until
  all of the air has been bledfrom the system.

  -Loosen the cap on the head of the pump to eliminate any air
  pockets;-Repeat the procedure for bleeding the radiators of
  air;-Open the taps for a brief period;-Check the system pressure
  and, if it has dropped, open the filling loop

  again to bring the pressure back up to 1.5 bar.2. Make sure that
  all gate valves are open;3. Turn on the gas cock and check the
  seals on the connections with an

  approved soap solution and eliminate any leaks.4. Press the
  reset button J for the lighting system; the spark will light
  the

  main burner. If the burner does not light the first time, repeat
  theprocedure.

  5. Check the minimum and maximum pressure values for the gas
  going tothe burner; adjust it if needed using the values indicated
  in the table insection 4 (See the relative section for burner
  pressure adjustment withinthe servicing manual).

  3.5 OPERATIONALADJUSTMENTS

• The boiler is fitted with the following devices (see section 3.2
  for references).1 — IGNITION FAILURE:

  This indicates ignition failure when a flame is not detected
  within 7seconds of starting an ignition sequence. The L.E.D. I will
  illuminateto signal the shutdown status.The system can be reset by
  pressing and releasing the button J afterchecking to make sure that
  the gas cock is open.

  2 — INSUFFICIENT SYSTEM PRESSURE:In the event of insufficient
  water pressure in the heating system, asafety device will shutdown
  the boiler. Check the system pressure onthe pressure gauge D and if
  it is less than 0.4 bar refill the system to1.5 bar. Once the
  system pressure is at the correct level the boiler willreset
  automatically.

  3 — OVERHEATING:This control shuts off the boiler in the case
  where the primary circuitreaches a temperature in excess of
  105C.The red L.E.D. I will illuminate to signal this shutdown
  status.The system can be reset by waiting a few minutes for the
  primaryexchanger to cool down and then by pressing and releasing
  the Jbutton.

  4. ANTI-FROST DEVICE:The boiler is equipped with a device that,
  in the event of the watertemperature going below 3C, the burner
  ignites at the minimum poweruntil the boiler water reaches a
  temperature of 33C.This device operates only if the boiler is
  functioning perfectly and:- the system pressure is sufficient;- the
  boiler is powered electrically — L.E.D. K illuminated;

  18

  3.8 BOILER SAFETY SYSTEMS

  In the boiler, it is possible to monitor the correct operation
  ofthe flue exhaust/air intake, checking for a loss of
  generalpressure in the system. Through the use of a
  differentialmanometer connected to the test points of the
  combustionchamber, it is possible to detect the P of operation of
  the airpressure switch.The value detected should not be less than
  0.55 mbar underconditions of maximum thermal power in order for the
  boilerto function properly and without interruption.

  The flue connector has two apertures, readings can betaken for
  the temperature of the combustion by-productsand of the combustion
  air, as well as of the concentrationsof O2 and CO2, etc.To access
  these intakes it is necessary to unscrew the frontscrew and remove
  the metal plate with sealing gasket.To achieve the best test
  conditions, turn the central heatingadjustment knob G to the max
  position and remove theelectrical connection to the heating sensor
  (see section 5).This will allow the appliance to operate at the
  maximumheating power. Do not allow this test to continue for
  longerthan necessary. Replace the connection on completion.

  3.6 COMBUSTION ANALYSIS

  3.7 FUME DISCHARGEMONITORING

  FU008A

  FU009A

• 19

  DRAINING THE HEATING SYSTEMThe heating system must be emptied as
  follows:- Turn off the boiler;- Attach a hose pipe and open the
  drain valve;- Empty the system at the lowest points (where
  present). When the heating

  system is unused for an extended period of time, it is
  recommended that youadd antifreeze with an ethylene glycol base to
  the water in the heating pipework and radiators if the ambient
  temperature drops below 0C during thewinter.This makes repeated
  draining of the entire system unnecessary.

  DRAINING THE DOMESTIC HOT WATER SYSTEMWhenever there is the
  danger of the temperature dropping below thefreezing point, the
  domestic hot water system must be drained as follows:

  — Turn off the general water valve for the household plumbing
  system;- Turn on all the hot and cold water taps;- Empty the
  remaining water from the lowest points in the system (where

  present).

  3.9 DRAINING THE SYSTEM

  — the gas is turned on.6 — EXHAUST DISCHARGE ANOMALY
  SHUTDOWN:

  The boiler is fitted with safety devices, which in the event of
  defectivedischarge of exhaust fumes, automatically interrupts the
  gas supply,thereby shutting off the boiler.The shutdown of the
  boiler is temporary and is indicated by theillumination of the
  yellow L.E.D. H for a period of about 15 minutes.Once this time
  period has passed and the discharge state of exhaustfumes has
  returned to normal, the boiler automatically turns back on.

• 20

  The boiler can be converted to use either methane (natural) gas
  (G20)or LPG (G30 — G31) by an Authorised Service Centre.The
  operations that must be performed are the following:1. Replace the
  jets on the main burner (see table in section 4);2. Adjust the
  maximum and minimum thermal capacity values for the boiler

  (see table in section 4);3. Replace the gas rating plate;4.
  Adjust the maximum thermal power setting;5. Adjust the soft-light
  feature;6. Adjust the ignition delay feature for the heating system
  (can be set from 0

  to 2 mins.).

  CATEGORY II2H3+

  Recommended Soft-light Pressure(mbar)

  MethaneGasG20

  8.0

  LiquidPropane

  GasG31

  16.0

  LiquidButane

  GasG30

  16.0

  4.1 CHANGING THETYPE OF GAS

  The outlet pressure of the gas cock is obtained by completely
  loosening thescrew on the solenoid. The maximum pressure of the gas
  to the burner willbe equal to the nominal delivery pressure minus
  the head loss within thegas valve.

  [1 mbar = 10,197 mmc.a.]

  4. GAS ADJUSTMENTS

  Lower Wobbe Index (15C;1013mbar) MJ/m3hNominal Delivery Pressure
  mbarMinimum Delivery Pressure mbar

  23 MFFI

  Main Burner: n. 12 jets () mmConsumption (15C; 1013mbar)
  m3/hConsumption (15C; 1013mbar) Kg/hGas Burner Pressuremax — min
  mbar

  CATEGORY II2H3+ Methane GasG20

  Liquid Butane GasG30

  Liquid Propane GasG31

  45.672017

  1.302.78—-

  11.0 — 2.0

  80.582920

  0.77—-

  2.02

  27.7 — 6.0

  80.583725

  0.77—-

  2.00

  35.5 — 7.3

• 21

  It is recommended that the following inspections be carried out
  on theboiler at least once a year:1 — Check the seals for the water
  connections; replace any faulty seals.2 — Check the gas seals;
  replace any faulty gas seals.3 — Visual check of the entire unit.4
  — Visual check of the combustion process or analysis of combustion
  by-

  products (see section 3.6) and cleaning of the burner if
  needed.5 — If called for by point. 3, dismantling and cleaning of
  the combustion

  chamber.6 — If called for by point. 4, dismantling and cleaning
  of the burner jets.7 — Visual check of the primary heat
  exchanger:

  — check for overheating in the blade assembly;- clean the
  exhaust fan if needed.

  8 — Adjustment of the flow rate of the gas: flow rate for
  lighting, partial loadand full load.

  9 — Check of the heating safety systems:- safety device for
  maximum temperature (overheat thermostat);- safety device for
  maximum pressure (safety valve).

  10- Check of the gas safety systems:- safety device for lack of
  gas or flame ionisation (detectionelectrode);- safety device for
  gas cock.

  11- Check of the electrical connection (make sure it complies
  with theinstructions in the manual).

  12- Check of domestic hot water production efficiency (flow rate
  andtemperature)

  13- General check of the combustion by-products of
  thedischarge/ventilation system.

  14- Check of the general performance of the unit.

  5. MAINTENANCE

• 22

  6. MISCELLANEOUS

  6.1 WIRING DIAGRAM FORTWO HEATING ZONES

  V4043HVALVE

  BROWN 8BLUE 2GREY 9

  ORANGE 10GREEN/YELLOW 3

  Hone

  ywell

  ST 69

  9B 10

  026

  3N

  LLin

  k L-5-

  8ST

  6400

  /ST 63

  00 ST

  6200

  34

  NL

  Dray

  ton Te

  mpu

  s 73

  4N

  LHo

  rstma

  nn 42

  5, 52

  5, 52

  71

  4E

  NL

  Link L

  -2-5

  Land

  is & G

  yr RW

  B23

  4N

  LGlo

  ww

  orm

  Ma

  sterm

  indLa

  ndis

  & Gyr

  RWB2

  03

  4N

  LMi

  crogy

  rPo

  tterto

  n Mi

  nimind

  er3

  4N

  LPo

  tterto

  n EP

  2000

  /3000

  -3

  4N

  LLin

  k L-5

  EP2

  001/3

  001

  Rand

  all 10

  2/102

  E1

  2E

  56

  Link 3

  -6Ra

  ndall

  4033

  42

  E7

  6Lin

  k 1-6

  Rand

  all 70

  1, 70

  23

  1E

  NL

  Link L

  -6-5

  Sang

  amo M

  51

  8E

  43

  Link 1

  -6Sa

  ngam

  o 410

  Form

  1

  18

  E4

  3Lin

  k 3-6

  PRO

  GRA

  MM

  ER

  64

  32

  1

  Pegle

  r Sun

  vic2

  5E

  NL

  SP 50

  /100 (L

  ink L-3

  )Sw

  itchma

  ster

  14

  NL

  Symp

  hony,

  So

  nata

  Switch

  maste

  r 400

  , 600

  31

  NL

  SWITC

  HMAS

  TER 8

  05, 9

  003

  1N

  LSu

  nvic

  ET 14

  517

  4E

  12

  Link 2

  -3-6

  Sunv

  ic DH

  P 22

  016

  3E

  12

  Towe

  rchro

  n FP

  610

  21

  Link 1

  -5/4-7

  -9To

  werc

  hron M

  P6

  102

  1Lin

  k 1-4/

  6-11

  Towe

  rchro

  n 200

  0

  HW

  H

  TGN

  LON

  ONAC

  L LS5

  22, L

  S722

  34

  NL

  Rand

  all 92

  2, 97

  23

  6E

  NL

  Link L

  -2-5

  Rand

  all 30

  20 P

  42

  EN

  Lan

  d 306

  0

  PRO

  GRA

  MM

  ER

  64

  32

  1

  EN

  Lm

  icroCo

  mbi23

  MFF

  I

  BO

  ILER

  910

  32

  240VMAINS INPUT (3 AMP)

  L 1

  N 2

  E 3

  1

  2

  3

  4

  5

  6

  7

  8

  9

  10

  TYPICALJUNCTION BOX

  T6360BROOM

  THERMOSTAT

  1 6

  3 8

  2 2

  ZONE 2

  V4043HVALVE

  BROWN 5BLUE 2GREY 9

  ORANGE 10GREEN/YELLOW 3

  T6360BROOM

  THERMOSTAT

  1 4

  3 5

  2 2

  ZONE1 ZONE

  1ZO

  NE 1

  ZONE

  2ZO

  NE 2

  1

  BOILER ELECTRICAL SUPPLY CABLE

  Remove internal time clock plugfrom the the P.C.B. then
  connectroom stat terminal block on thereverse of the boiler control
  panel(see section 2.10) to 9 + 10 onthe junction box.

  If a room thermostat is not required on Zone 1, insert a
  linkbetween 4 + 5 on the junction box.

  If a room thermostat is not required on Zone 2, insert a
  linkbetween 6 + 8 on the junction box.

  Base

  d on

  Hon

  eywe

  ll co

  ntro

  ls

• 23

  6.2 WIRING DIAGRAM FORCONNECTION TO ANARISTON
  UNVENTEDCYLINDER

  Hone

  ywell

  ST 69

  9B 10

  026

  3N

  LLin

  k L-5-

  8ST

  6400

  /ST 63

  00 ST

  6200

  34

  NL

  Dray

  ton Te

  mpu

  s 73

  4N

  LHo

  rstma

  nn 42

  5, 52

  5, 52

  71

  4E

  NL

  Link L

  -2-5

  Land

  is & G

  yr RW

  B23

  4N

  LGlo

  ww

  orm

  Ma

  sterm

  indLa

  ndis

  & Gyr

  RWB2

  03

  4N

  LMi

  crogy

  rPo

  tterto

  n Mi

  nimind

  er3

  4N

  LPo

  tterto

  n EP

  2000

  /3000

  -3

  4N

  LLin

  k L-5

  EP2

  001/3

  001

  Rand

  all 10

  2/102

  E1

  2E

  56

  Link 3

  -6Ra

  ndall

  4033

  42

  E7

  6Lin

  k 1-6

  Rand

  all 70

  1, 70

  23

  1E

  NL

  Link L

  -6-5

  Sang

  amo M

  51

  8E

  43

  Link 1

  -6Sa

  ngam

  o 410

  Form

  1

  18

  E4

  3Lin

  k 3-6

  PRO

  GRA

  MM

  ER

  64

  32

  1

  Pegle

  r Sun

  vic2

  5E

  NL

  SP 50

  /100 (L

  ink L-3

  )Sw

  itchma

  ster

  14

  NL

  Symp

  hony,

  So

  nata

  Switch

  maste

  r 400

  , 600

  31

  NL

  SWITC

  HMAS

  TER 8

  05, 9

  003

  1N

  LSu

  nvic

  ET 14

  517

  4E

  12

  Link 2

  -3-6

  Sunv

  ic DH

  P 22

  016

  3E

  12

  Towe

  rchro

  n FP

  610

  21

  Link 1

  -5/4-7

  -9To

  werc

  hron M

  P6

  102

  1Lin

  k 1-4/

  6-11

  Towe

  rchro

  n 200

  0

  HW

  H

  TGN

  LON

  ONAC

  L LS5

  22, L

  S722

  34

  NL

  Rand

  all 92

  2, 97

  23

  6E

  NL

  Link L

  -2-5

  Rand

  all 30

  20 P

  42

  EN

  Lan

  d 306

  0

  PRO

  GRA

  MM

  ER

  64

  32

  1

  EN

  L

  BO

  ILER

  910

  32

  1

  2

  3

  4

  5

  6

  7

  8

  9

  10

  TYPICALJUNCTION BOX

  1

  BOILER ELECTRICAL SUPPLY CABLE

  Remove internal time clock plugfrom the the P.C.B. then
  connectroom stat terminal block on thereverse of the boiler control
  panel(see section 2.10) to 9 + 10 onthe junction box.

  T6360BROOM

  THERMOSTAT

  1 4

  3 5

  2 2

  V4043HHEATING VALVE

  BROWN 5BLUE 2GREY 9

  ORANGE 10GREEN/YELLOW 3

  V4043HHOT WATER VALVE

  BROWN 8BLUE 2GREY 9

  ORANGE 10GREEN/YELLOW 3

  1 C/P

  Cylinderthermostat

  Thermalcut-out

  1 8

  6

  Notused

  P

  21 C/P2

  240VMAINS INPUT (3 AMP)

  L 1

  N 2

  E 3

  micro

  Comb

  i23 M

  FFI

  Base

  d on

  Hon

  eywe

  ll co

  ntro

  ls

• 23 9

  9 84

  158

  9 00

  0-

  Sta

  mp

  a: b

  ieff

  e R

  ECA

  NA

  TI

  CE CertificationHeat Input max/min kWHeat Output max/min
  kWEfficiency of Nominal Heat Input %Efficiency at 30% of Nominal
  Heat Input %Heat Loss to the Casing (T=50C) %Flue Heat Loss with
  Burner Operating %Flue Heat Loss with Burner Off %Maximum Discharge
  of Fumes (G20) Kg/hResidual Discharge Head mbarConsumption at
  Nominal Capacity(G20) m3/hGas Consumption after 10 Minutes* m3(15C,
  1013 mbar) (G30-G31) Kg/hTemp. of exhaust fumes at nominal capacity
  CCO2 Content %O2 Content %CO Content ppmMinimum Ambient Temperature
  CHead Loss on Water Side (max) (T=20C) mbarResidual Head of System
  barHeating Temperature max/min CDomestic Hot Water Temperature
  max/min CD.H.W. Flow Rate T=35C l/minD.H.W. Flow Rate T=35C
  gal/minD.H.W. Minimum Flow Rate l/minPressure of Domestic Hot Water
  max/min barExpansion Vessel Capacity lExpansion Vessel Pre-load
  Pressure barMaximum Water Content of System lMaximum Heating
  Pressure barNominal Pressure Natural Gas (G20) mbar

  LPG (G30-G31) mbarElectrical Supply V/HzPower Consumption
  WProtection Grade of Electrical System IPInternal Fuse RatingWeight
  Kg

  G.C. Number

  7. TECHNICAL INFORMATION

  63AU454725.6/11.023.7/9.6

  92.590.51.06.50.451

  0.962.720.32

  2.02/2.001267.08.038+52000.25

  82/4254/369.72.22.5

  8/0.261

  1303

  2030-37

  230 / 50135X4D

  FAST 2 AT39

  47-116-16

  23 MFFI

  *Calculated at 70% maximum output

  Manufacturer: Merloni TermoSanitari SpA — Italy

  Commercial subsidiary: MTS (GB) LIMITEDMTS BuildingHughenden
  AvenueHigh WycombeBucks HP13 5FTTelephone: (01494) 755600 Fax:
  (01494) 459775Internet: http://www.mtsgb.ltd.ukE-mail:
  [email protected] Service Hot Line: (01494) 539579

• ServicingInstructionsType C BoilersG.C.N: 47-116-16

  LEAVE THESE INSTRUCTIONSWITH THE END-USER

  Country of destination: GB

• 21. SERVICING INSTRUCTIONS

  1.1 REPLACEMENT OF PARTS

  1.2 TO GAIN GENERAL ACCESS- Removing the front panel- Removing
  the sealed chamber front cover- Removing the side panels

  1.3 ACCESS TO THE COMBUSTION CHAMBER- Removing the combustion
  cover- Removing the burner and jets- Removing the electrodes-
  Removing the heat exchanger- Removing the air pressure switch-
  Removing the fan- Removing the venturi device

  1.4 SERVICING AND REMOVAL OF THE GAS VALVE- Setting the gas
  pressures- Removing the spark generator- Removing the gas valve

  1.5 ACCESS TO THE WATER CIRCUIT- Removing the pump pressure
  switch- Removing the safety valve- Removing the automatic air vent-
  Removing the pump- Removing the pressure gauge- Removing the
  expansion vessel- Removing the overheat thermostat- Removing the
  heating temperature sensor (N.T.C.)- Removing the D.H.W.
  temperature sensor (N.T.C.)- Removing the diverter valve
  microswitch- Removing the diverter valve

  1.6 ACCESS TO THE CONTROL SYSTEM- Checking the fuses- Removing
  the time clock — Removing the P.C.B.

  2. FAULT FINDING

  2.1 FAULT FINDING GUIDE (FLOW-CHART)

  3. ELECTRICAL DIAGRAMS

  4. SHORT SPARE PARTS LIST

  TABLE OF CONTENTS

• 2. The control panel moves downward and when pulled
  forward,rotates on two lateral hinges; the panel stays in a
  semi-horizontal position, which allows access to the inner parts
  ofthe boiler (FIG. 1.2);

  3. In order to increase the manoeuvring space, it is possible
  toraise the control panel and rotate it to a fully horizontal
  position(FIG. 1.3);

  4. Remove the screws B from the front panel bottom lip (FIG.
  1.4);

  5. Lift the front panel up and forward from the raised screws at
  thethe top of the casing (FIG. 1.5).

  FIG. 1.4

  B

  FIG. 1.5

  3

  1. SERVICING INSTRUCTIONS

  The life of individual components varies and they will
  needservicing or replacing as and when faults develop.The fault
  finding sequence chart in chapter 2 will help to locatewhich
  component is the cause of any malfunction, and instructionsfor
  removal, inspection and replacement of the individual parts
  aregiven in the following pages.

  1.1 REPLACEMENT OF PARTS

  1.2 TO GAIN GENERAL ACCESS

  All testing and maintenance operations on the boiler require
  thecontrol panel to be lowered. This will also require the removal
  ofthe casing.

  1.2.1 Removing the front panel

  1. Loosen the fastening screws A of the control panel located
  onthe lower part of the panel itself. (FIG. 1.1);

  A

  FIG. 1.3

  FIG. 1.1

  FIG. 1.2

  To ensure efficient safe operation, it is recommended that
  theboiler is serviced annually by a competent person.

  Before starting any servicing work, ensure both the gas
  andelectrical supplies to the boiler are isolated and the boiler
  iscool.Before and after servicing, a combustion analysis should be
  madevia the flue sampling point (please refer to the Installation
  Manualfor further details).

  After servicing, preliminary electrical system checks must
  becarried out to ensure electrical safety (i.e. polarity, earth
  continuity,resistance to earth and short circuit).

• 41.2.2 Removing the sealed chamber front cover

  1. Remove the screws C (FIG. 1.6);2. Lift the sealed chamber
  front cover from the locating pins

  (FIG. 1.7).

  FIG. 1.6

  C

  C

  FIG. 1.7

  1.2.3 Removing the side panels

  1. Remove the four screws D for each side panel (FIG.1.8);2.
  Pull the panel away from the boiler at the base, then lift the

  panel up and remove from the boiler (FIG.1.9).

  D

  D

  D

  FIG. 1.8

  FIG. 1.9

• 1.3.3 Removing the electrodes

  Before carrying out this procedure, unscrew and slide theburner
  forward (see previous section).1. Remove rubber gasket G (FIG.
  1.13);2. To remove the detection electrode disconnect the cable

  at its connection point close to the P.C.B. (FIG. 1.14);3.
  Remove screw H (FIG. 1.15);4. Gently slide the electrode downward
  (FIG. 1.16).

  FIG. 1.13

  G

  FIG. 1.14

  1.3.2 Removing the burner and jets

  1. Remove the screws F from the burner (FIG. 1.11);2. Remove the
  burner (FIG. 1.12);3. Disconnect the electrodes (see section
  1.3.3);4. Remove the jets using a No. 7 socket spanner;5. Replace
  in reverse order.

  5

  1.3.1 Removing the combustion cover

  1. Remove the screws E (FIG. 1.10);2. Lift off the combustion
  cover.

  1.3 ACCESS TO THE COMBUSTION CHAMBER

  E

  E

  E

  FIG. 1.10

  FIG. 1.11

  Fig. 1.12

  F

  F

• 6To replace, repeat the steps in reverse order, payingparticular
  attention to the following:a -Centre the electrode in the
  positioning hole carefully,

  otherwise the electrode may break;b -Ensure that the left hand
  and right hand electrodes are

  located the correct way round (facing each other), togive the
  correct spark gap;

  c -Check that the cables have been connected correctly;d -Check
  that the rubber gasket covers the cable/ electrode

  connection point completely.

  FIG. 1.15

  FIG. 1.16

  H

  1. Drain the boiler of water;2. Remove the overheat thermostat
  sensor, D.H.W. sensor

  and heating sensor I (FIG. 1.17);3. Release the four connection
  nuts J connecting the

  exchanger to the flow and return pipes (FIG. 1.18);4. Pull it
  straight out (FIG. 1.19).

  1.3.4 Removing the main heat exchanger

  FIG. 1.18

  J

  Fig. 1.17

  I

  FIG. 1.19

  I

• 1. Disconnect electrical connections N and silicone pipe
  O(FIG.1.23);

  2. Remove screw P and remove the fan collar clamp
  Q(FIG.1.24);

  3. Remove screws R (FIG.1.25);4. Remove fan and mounting plate
  (FIG.1.26).

  1.3.6 Removing the fan

  1. Disconnect the electrical connections K and siliconepipes L
  from their connection points (FIG. 1.20);

  2. Remove screws M on the top of the sealed chamber(FIG.
  1.21);

  3. Lift out the air pressure switch (FIG. 1.22);4. Unscrew to
  remove the switch from the plate.

  7

  1.3.5 Removing the air pressure switch

  FIG. 1.25

  R R

  FIG. 1.24

  PQ

  FIG. 1.23

  NN

  O

  FIG. 1.26

  FIG. 1.21

  FIG. 1.20

  L

  L

  K

  M

  M

  FIG. 1.22

• 81.4 SERVICING AND REMOVALOF THE GAS VALVE

  1.4.1 Setting the gas pressures

  1

  2

  Recommended pressure for soft-light ignition 8 mbar

  NATURAL GAS (G20) BUTANE GAS (G30) PROPANE GAS (G31)

  16 mbar 16 mbar

  3

  4

  A

  B

  C

  E

  F

  D

  Setting the minimum and the maximum power of the boiler1. Check
  that the supply pressure to the gas valve is a minimum of 20
  mbar

  for natural gas.2. To do this, loosen the screw A.

  Fit the pipe of the pressure gauge to the inlet pressure
  connection of thegas valve B.When you have completed this
  operation, replace the screw A securelyinto its housing to seal off
  the gas.

  3. To check the pressure supplied by the gas valve to the
  burner, loosen thescrew C. Fit the pipe of the pressure gauge to
  the pressure outlet testpoint of the gas valve D.Disconnect the
  compensation pipe either from the gas valve or from thesealed
  chamber.

  4. Push the On/Off button to ON position -green light- and push
  the Heatingbutton to ON position -green light-Turn on the boiler by
  running a hot water tap.Adjust the 10mm nut E on the modureg to set
  the maximum gaspressure, turn the nut clockwise to increase and
  anti clockwise to decreasethe pressure until the required pressure
  is achieved (see TABLE A page 9)

  5. To set the minimum power, disconnect a supply terminal from
  the moduregand adjust screw F.Turn the screw clockwise to increase
  the pressure and coun-ter-clockwise to decrease the pressure
  (displayed on thepressure gauge) corresponding to the minimum power
  (see TABLE A page9).

  6. When you have completed the above operations, turn off thehot
  water tap, re-connect the supply terminal to the moduregon the gas
  valve and replace the cap on the screw of themodureg.

  Setting the maximum heating circuit power7. To set the maximum
  heating circuit power, push the On/Off button to the

  ON position -green light- and push the Heating button and set
  the timeclock and any external controls to the ON position -green
  light. Turn theknob of the heating thermostat clockwise to
  maximum.

  8. Remove the inspection panel of the P.C.B. and fit a small
  cross-headscrewdriver in to the right hand potentiometer. Turn
  clockwise to increasethe pressure or counter-clockwise to reduce
  the pressure. Adjust thesetting to the required heating pressure
  value (displayed on the pressuregauge), as indicated in the charts
  shown in page 9.

  9. Turn off the boiler by placing the main switch to the «OFF»
  position.

  Setting pressure for soft ignition.Disconnect the detection
  electrode connection close to the P.C.B. (FIG.1.14).Start the
  boiler and during the ignition sequence adjust the left
  handpotentiometer until the gas pressure reads the required gas
  pressure asper the table below.Once the gas pressure is set turn
  off the boiler and re-connect theconnection to the P.C.B.

• 9model 23

  Regulating the heating power fornatural gas (G20)

  model 23

  Regulating the heating power forbutane gas (G30)

  model 23

  34363840

  Regulating the heating power forpropane gas (G31)

  23 M

  FFI

  2.78

  20

  11.0

  2.0

  1.16

  2.02 Kg/h

  0.87 Kg/h

  27.5 mbar

  6.2 mbar

  28 mbar

  12 x 0.77

  2.00 Kg/h

  0.85 Kg/h

  35.5 mbar

  7.3 mbar

  37 mbar

  12 x 0.77

  TABLE A

  CG010A

  CG011A

  CG012A

• 10

  1.4.2 Removing the spark generator

  1. Disconnect ignition leads S by pulling upward(FIG. 1.27);

  2. Remove the screw T (FIG. 1.28);3. Remove the spark generator
  by pulling forward from the

  gas valve (FIG. 1.29).

  NB.: It may be necessary to reset the flame failure reseta
  number of times during this operation.

  10. Remove the pipe from the pressure gauge and connectscrew C
  to the pressure test point in order to seal offthe gas.

  11. Carefully check the pressure test points for gas leaks(valve
  inlet and outlet).

  IMPORTANT!Whenever you disassemble and reassemble the
  gasconnections, always check for leaks using a soap and
  watersolution.

  FIG. 1.27

  FIG. 1.28

  FIG. 1.29

  S

  T

  Soft-lightAdjustment

  Max HeatingAdjustment

• 11

  Important! Before any component is removed, the boilermust be
  drained of all water.1.5.1 Removing the pump pressure
  switch1.Remove the pump pressure switch electrical connections

  W (FIG 1.33);2.Unscrew the pump pressure switch by using a
  spanner on

  the nut;3.Remove the pump pressure switch.

  1.5 ACCESS TO THE WATER CIRCUIT

  FIG. 1.30

  FIG. 1.31

  FIG. 1.32

  FIG. 1.33

  U

  VV

  1.4.3 Removing the gas valve

  Important! Before removing the gas valve, ensure the gassupply
  is turned off.

  1. Disconnect all the cables from the solenoid andmodureg;

  2. Remove the spark generator (see previous section);3. Release
  the nuts U (FIG. 1.30);4. Remove the screws V from the bottom of
  the gas valve

  (FIG. 1.31);5. Remove the gas valve (FIG. 1.32).

  W

  U

• 12

  1.5.3 Removing the automatic air vent1. Unscrew valve top Y
  (FIG. 1.35);2. Remove valve complete with float (FIG 1.36).

  FIG. 1.35

  Y

  FIG. 1.36

  1.5.2 Removing the safety valve

  1. Disconnect the discharge pipe work from below theboiler;

  2. Unscrew and remove the valve X (FIG. 1.34).

  FIG. 1.34

  X

• 13

  1.5.4 Removing the pump

  1. Remove the U-clip Z (FIG. 1.37);2. Remove the retaining clips
  A1 (FIG. 1.38);3. Release the nut C1 (FIG. 1.39);4. Remove the pipe
  D1 (FIG. 1.40);5. Remove the screws E1 (FIG. 1.41);6. Remove the
  pump.

  Z

  FIG. 1.37

  FIG. 1.38

  FIG. 1.39

  A1

  C1

  Z

  FIG. 1.40

  FIG. 1.41

  D1

  E1E1

• 14

  1.5.6 Removing the expansion vessel

  1. Release nuts G1 and remove the gas pipe (FIG. 1.44);2.
  Release nut H1 (FIG. 1.45);3. Remove back-nut I1 (FIG. 1.46);4.
  Remove the expansion vessel (FIG. 1.47).

  1.5.5 Removing the pressure gauge

  1. Remove the U-clip F1 (FIG. 1.42)2. Remove the pressure gauge
  coupling (FIG. 1.42);3. Push the pressure gauge through the control
  panel from

  the rear (FIG. 1.43).

  FIG. 1.44

  F1

  FIG. 1.43

  G1

  H1

  FIG. 1.45

  FIG. 1.46

  FIG. 1.47

  G1

  I1

  FIG. 1.42

• 15

  1.5.7 Removing the overheat thermostat

  1. Disconnect the overheat thermostat electricalconnections J1
  (FIG. 1.48);

  2. Then remove the thermostat from its mounting byreleasing the
  securing clip (FIG. 1.49 /1.50).

  1.5.8 Removing the heating temperature sensor(N.T.C.)

  1. Pull off the electrical connector and unscrew the sensorprobe
  using a suitable spanner (FIG. 1.51).

  FIG. 1.48

  FIG. 1.49

  1.5.9 Removing the D.H.W. temperature sensor (N.T.C.)

  1. Pull off the electrical connector and unscrew the sensorprobe
  using a suitable spanner (FIG. 1.52).

  J1

  FIG. 1.51

  FIG. 1.50

  FIG. 1.52

• 16

  1.6 ACCESS TO THE CONTROL SYSTEM

  FIG. 1.53

  1.6.1 Checking the fuses

  1. Remove the inspection cover on the reverse of thecontrol
  panel (FIG. 1.54);

  2. Remove the fuses (FIG. 1.55).

  FIG. 1.54

  FIG. 1.55

  M1

  N1

  Important! Isolate the electrical supply to the boiler
  beforeaccessing the control panel.

  1.5.10 Removing the D.H.W. flow switch

  1. Unplug the electrical connector M1 (FIG. 1.59);2. Release the
  retaining clip N1 and remove the D.H.W.

  flow switch.

• 17

  1.6.3 Removing the P.C.B.

  1. Isolate electricity;2. Remove the inspection cover from the
  reverse of the

  control panel;3. Unplug all electrical connections from the
  P.C.B.4. Remove the screws R1 (FIG. 1.59);5. Separate the facia
  panel from the rear of the control

  panel ;7. Remove the screws S1 and remove the P.C.B.

  (FIG. 1.60).

  FIG. 1.59

  R1R1 R1

  FIG. 1.60

  S1S1

  1.6.2 Removing the time clock

  1. Disconnect the electrical connections P1 from theclock (FIG.
  1.56);

  2. Remove screws Q1 (FIG. 1.57);3. Lift out the time clock from
  the control panel (FIG. 1.58).

  FIG. 1.56

  FIG. 1.57

  FIG. 1.58

  P1

  Q1

  Q1

• 18

  2. FAULT FINDING

  It is possible to detect and correct any defect by using the
  standard faultfinding diagrams described in this chapter.

  2.1 FAULT FINDING GUIDE(FLOW-CHARTS)

• 19

  IS THE PUMPRUNNING? NO

  NO

  YES

  YES

  POWER TOTHE PUMP?

  1 — Check that the pump is not stuck2 — Release/replace pump

  1 — Check system pressure2 — Check pump cable.3 — Check/replace
  P.C.B

• 20

  IS THE FANRUNNING?

  BOILERSHUTDOWN?

  POWERTO FAN?

  NO

  YES

  YES

  NO

  YES

  NO

  NO

  YES

  1 — Check/replace air pressure switch2 — Check if reset button
  is jammed3 — Check/replace flame detection electrode

  1 — Check/replace connection cable2 — Check/replace P.C.B.3 —
  Check air pressure switch is not stuck the N.O. position

  1 — Replace fan

  1 — Reset the boiler

  INTERNALP.C.B. PROTECTIONS

  ACTIVATED?

• 21

  IS THE BURNERALIGHT?

  POWER TOGAS VALVE?

  POWER TO SPARK

  GENERATOR?

  YES YES

  NO

  YES

  YES

  NO

  NONO

  NO

  YES

  1 — Check/replace cable2 — Check/replace P.C.B.

  1 — Check/replace cable2 — Check/replace P.C.B.

  1 — Check if flame strikes detection electrode2 — Check
  soft-light gas pressure3 — Check/replace detection electrode4 —
  Check/replace P.C.B.

  1 — Check/replace spark generator2 — Check/replace ignition
  electrodes and cables3 — Check spark gap

  1 — Check gas supply pressures2 — Check gas pressure to burner3
  — Check spark gap4 — Check/replace gas valve

  IS THEAIR PRESSURE SWITCH

  ACTIVATED?

  CHECKP ON AIR

  PRESSURE TESTPOINT

  HAS THEBOILER SAFETY

  SHUTDOWN BEENACTIVATED?

  1 — Check exhaust/air intake2 — Check venturi & tubes3 —
  Check fan efficiency/replace

  1 — Check/replace A.P. switchP 0.55mbar

  P 0.55mbar

  YES

  DOESTHE SPARK SEQUENCE

  START?

  NO

• 22

• 23

  3. ELECTRICALDIAGRAMS

  LEGEND:

  A = Central Heating Temperature AdjustmentB = Domestic Hot Water
  Temperature AdjustmentC = Soft-light AdjustmentD = Maximum Heating
  AdjustmentE = Time Clock ConnectorF = On/Off SwitchG = Fume Sensor
  L.E.D.H = Central Heating SelectorI = Ignition Failure (Lockout)
  L.E.D.J = On/Off L.E.D.K = Reset ButtonL = Central Heating L.E.D.M
  = TransformerN = Circulation Pump RelayO = Fan RelayP = Gas Valve
  RelayQ = Spark Generator I.C.

  A01 = Circulation PumpA02 = FanA03 = Spark Generator/Gas Valve
  SupplyA04 = Flame Detection CircuitA05 = Detection ElectrodeA06 =
  Main Circuit Temperature ProbeA07 = Domestic Hot Water Temperature
  ProbeA08 = D.H.W. Flow SwitchA09 = Pump Pressure SwitchA10 =
  ModulatorA11 = Air Pressure SwitchA12 = Safety ThermostatA13 =
  External (Room) Thermostats

  Colours:Gry = Grey Wh = WhitePnk = PinkBrn = BrownBl = BlueBlk =
  BlackRd/Blk = Red/Black

• 24

  microCombi 23 MFFI

  SE016A

  SF013A

• 25

  4. SHORT SPARE PARTS LIST

  microCombi 23 MFFI

• 26

• 27

  NOTES

• 23 9

  9 84

  1590

  000

  Stam

  pa:B

  ieffe

  Rec

  anat

  iManufacturer: Merloni TermoSanitari SpA — Italy

  Commercial subsidiary: MTS (GB) LIMITEDMTS BuildingHughenden
  AvenueHigh WycombeBucks HP13 5FTTelephone: (01494) 755600 Fax:
  (01494) 459775Internet: http://www.mtsgb.ltd.ukE-mail:
  [email protected] Service Hot Line: (01494) 539579