ariston Genus 27 BFFI Plus User guide

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Installation Instructions Type C Boilers G.C.N: 47-116-11

LEA VE THESE INSTRUCTIONS WITH THE END USER

Country of destination: GB

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TABLE OF CONTENTS

1. GENERAL INFORMATION

1.1 General Instructions

1.2 Overall View

2. INSTALLATION

2.1 Reference Standards

2.2 Siting the Appliance

2.3 Overall Dimensions

2.4 Clearances

2.5 Mounting the Appliance

2.6 Electrical Connection

2.7 Gas Connection

2.8 Water Connections

2.9 Flue Connection

2.10 Room Thermostat Connection

2.11 Electrical/System Diagrams

2.12 Water Circuit Diagrams

3. COMMISSIONING

3.1 Initial Preparation

3.2 Removing the Casing

3.3 Control Panel

3.4 Initial Start-up

3.5 Operational Adjustments

3.6 Combustion Analysis

3.7 Fume Discharge Monitoring

3.8 Boiler Safety Systems

3.9 Draining the System

4. GAS ADJUSTMENTS

- Gas Adjustment Table

4.1 Changing the Type of Gas

5. MAINTENANCE

TECHNICAL INFORMATION

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This manual is an integral and essential part of the product. It should be kept with the appliance so that it can be consulted by the user and our authorised personnel.

Please carefully read the instructions and notices about the unit contained in this manual, as they provide important information regarding the safe installation, use and maintenance of the product.

For operating instructions please consult the separate User’s Manual.

Read the instructions and recommendations in these Installation Instructions carefully 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 while our Servicing Centre technicians or your installer may need to consult it in the future.

This is a combined appliance for the production of central heating (C.H.) and domestic 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 b y improper or negligent use . No asbestos or other hazardous materials have been used in the fabrication of this

product. Before connecting the appliance, check that the information shown on the data

plate and the table on pages 4-5 comply with the electric, water and gas mains of the 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 the bottom of the boiler.

Do not install this appliance in a damp environment or close to equipment which spray water or other liquids.

Do not place objects on the appliance. Do not allow children or inexperienced persons to use the appliance without super-

vision. If you smell gas in the room,

do not turn on light switches, use the telephone or any other object which might cause sparks. Open doors and windows immediately to ventilate the room. Shut the gas mains tap (on the gas meter) or the valve of the gas cylinder and call your Gas Supplier immediately. If you are going away for a long period of time, remember to shut the mains gas tap or the gas cylinder valve.

Always disconnect the appliance either by unplugging it from the mains or turning off the mains switch before cleaning the appliance or carriyng out maintenance.

In the case of faults or failure, switch off the appliance and turn off the gas tap.Do not tamper with the appliance. For repairs, call your local Authorised Servicing Centre and request the use of original spare parts. For in-guarantee repairs contact MTS (GB) Limited

Check the following at least once a year: 1 - Check the seal of water connections, replacing the gaskets if necessary. 2 - Check the seal of the gas connections, replacing the gaskets if necessary. 3 - Check the general condition of the appliance and of the combustion chamber

visually.

4 - Visual check of the combustion:clean burners if necessary. 5 - With reference to point 3, dismantle and clean the combustion chamber if nec-

essary.

1. GENERAL INFORMATION

1.1 General Information

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Legend:

1. Air Pressure Switch

2. Fan

3. Main Heat Exchanger

4. Combustion Chamber

5. Ignition Electrodes and Detection Electrodes

6. Burner

7. Automatic air release valve

8. Gas Valve

9. Spark Generator

10. Circulation Pump

11. Motorised Valve with by-pass

12. Main Circuit Flow Switch

13. Safety Valve (3 bar)

14. Low pressure switch

15. Expansion relief valve (6 bar)

16. C .H.expansion Vessel

17. D.H.W. expansion Vessel

18. Drain point

19. C.H.W. Probe

20. Ov erheat Thermostat

21. D.H.W.Storage with insulation shell

Fig. 1.1

1.2 Overall View

6 - With reference to point 4, dismantle and clean the injectors if necessary. 7 - Visual check of the primary heat exchanger:

- check for overheating of the exchangers fins;

- clean the exhaust side of the exchanger and fan if necessary.

8 - Regulate the gas pressure, ignition pressure, partial flame, maximum flame. 9 - Check proper operation of the heating safety system:

- maximum safety temperature;

- maximum safety pressure.

10 - Check the proper operation of the gas safety system:

- gas or flame safety device;

- gas valve safety device.

11 - Check that the electrical connections have been made in compliance wit h the

instructions shown in the Installation Instructions.

12 - Check the efficiency of the hot water supply (flow and temperature). 13 - Check pressure in the Domestic Expansion Vessel and top up as necessary. 14 - Check manually by turning the test knob the Temperature & Pressure Relief Valve. 15 - Check manually by turning the test knob the Expansion Relief Valve. 16 - Check discharge pipes from both the central heating and domestic hot water

for obstructions.

17 - Check general operation of the appliance. 18 - Check the exhaust system for the combustion products.

IN003A

The technical information and instructions provided herein below are intended for the installer so that the unit may be installed correctly and safely.

WATER REGULATIONS

These regulations ensure a good supply of wholesome water, and that only approved materials, pipes and fittings are used to convey water.

BUILDING REGULATIONS

These are a statutory document and take priority over all other regulations and recommendations.The installation of an unvented hot water storage cylinder is classified as a "Controlled Service" and Regulation G3 applies. To meet the requirements of the Regulation, installation of an unvented system should be undertaken by a "competent installer".

All installations of unvented hot water storage systems having a capacity of more than 15 litres should be notified to the relevant Local Authority by means of building notice or by the submission of full plans. It is important to note that it is a cr iminal offense to install an unvented hot water storage system without notifying the Local Authority.

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

The installation of this appliance must be in accordance with the relevant requirements of the current Gas Safety (installation & use) Regulations, the Local Building Regulations, the current I.E.E. Wiring Regulations, the byelaws of the local water authority, and in Scotland, in accordance with the Building Standards (Scotland) Regulation and Health and Safety document No.635 “Electricity at work regs.1989”. Installation should also comply with the following British Standard Codes of Practice:

The appliance may be installed in any room or indoor area, although particular attention is drawn to the requirements of the current I.E.E. Wiring Regulations, and in Scotland, the electrical provisions of the Building Regulations applicable in Scotland, with respect to the installation of the combined appliance in a room containing a bath or shower.

Where a room-sealed appliance is installed in a room containing a bath or shower the boiler and any electrical switch or appliance control, utilising mains electricity should be situated so that it cannot be touched by a person using the bath or shower.

The location must permit adequate space for servicing and air circulation around 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 specifically for this purpose. No specific ventilation requirements are needed for an installation within a cupboard This appliance is not suitable for outdoor installation.

The type C appliances (in which the combustion circuit, air vent intake and combustion chamber are air-tight with respect to the room in which the appliance is installed) can be installed in any type of room.

There are no limitations with respect to ventilation and the volume of the room itself. The boiler must be installed on a solid, permanent wall to prevent access to the electrical parts (when live) through the aperture on the back frame.

2. INSTALLATION

2.1 Reference Standards

2.2 Siting the Appliance

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

heating systems

BS 5546:1990 Installation of hot water supplies for domestic

purpoes BS 5440-1:1990 Flues BS 5440-2:1989 Air supply BS 5449:1990 Forced circulation hot water systems BS 6789:1987 Installation of gas fired hot water boilers BS 6891:1989 Gas installations BS 7671:1992 IEE wiring regulations BS 4814:1990 Specification for expansion vessels BS 5482:1994 Installation of LPG

400

Fasten the boiler in place using the template and anchors supplied with the unit. It is highly recommended that a spirit level be used to position the boiler so that it is perfectly level. For additional information, please consult the instructions contained in the connection kit and the flue kit.

2.5 Mounting the Appliance

2.6 Electrical Connection

Fig. 2.3

Legend:

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

2.3 Overall Dimensions

In order to allow for access to the interior of the boiler for maintenance purposes, the boiler must be installed in compliance with the clearance requirements indicated in the diagram below.

2.4 Clearances

Fig. 2.1

Fig. 2.2

For safety purposes, have a competent person carefully check the electrical system in the property, as the manufacturer will not be held liable for damage caused by the failure to earth the appliance properly or by anomalies in the supply of power. Make sure that the residential electrical system is adequate for the maximum power absorbed by the unit, which is indicated on the rating plate. In addition, check that the section of cabling is appropriate for the power absorbed by the boiler.

The boiler operates with alternating current, as indicated in the technical data table (7), where the maximum absorbed power is also indicated. Make sure that the connections for the neutral and live wires correspond to the indications in the diagram. The appliance electr ical connections are situated on the reverse of the control panel (see the servicing manual for further information)

Important!

In the event that the power supply cord must be changed, replace it with one with the same specifications. Make the connections to the terminal board located within the control panel, as follows:

- The yellow-green wire should be connected to the terminal marked with the earth symbol; make sure to re-use the ferrule mounted on the other supply cord;

- The blue wire should be connected to the terminal marked “N”;

- The brown wire should be connected to the terminal marked “L”. 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 qualified technician and be in accordance with the current I.E.E. Regulations and applicable local regulations.The Genus range of boilers are sup-

plied 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 complete electrical isolation of the appliance, by the use of a fused double pole isolator having a contact separation of at least 3 mm in all poles or alternatively, by

means of a 3 A fused three pin plug and

Fig. 2.1

QT003A

DM002A

VR004A

400

Central Heating

Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990, the fol-

lowing notes are given for general guidance.

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 carried naturally to air release points and water flows naturally to drain taps. The appliance has a built-in automatic air release valve, however it should be ensured as far as possible that the appliance heat exchanger is not a natura collecting point for air. Except where providing useful heat, pipes should be insulated to prevent heat loss and avoid freezing. Particular attention should be paid to pipes passing through ventilated spaces in roofs and under floors.

By-pass:

The appliance includes an automatic by-pass valve, which protects the main heat exchanger in case of reduced or interrupted water circulation through the heating system, due to the closing of thermostatic valves or cock-type valves within the system.

System Design:

This boiler is suitable only for sealed systems.

Drain Cocks:

These must be located in accessible positions to permit the draining of the whole system.The taps must be at least 15mm nominal size an manufactured in accordance with BS 2870:1980.

Safety V alv e Discharge:

The discharge should terminate facing downwards on the exterior of the building in a position where discharging (possibly boiling water & steam) will not create danger or nuisance, but in an easily visible position, and not cause damage to electrical components and wiring. The discharge must not be over an entrance or a window or any other type of public access.

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 an adequate supply is available both to the boiler and the other appliances when they are in use at the same time. Pipe work must be of an adequate size. Pipes of a smaller size than the boiler inlet connection should not be used.

2.8 Water Connections

View of the Boiler Connections

Fig. 2.4

unswitched shuttered socket outlet both complying with BS 1363. The point of connection to the Electricity supply must be readily accessible and adjacent to the appliance unless the appliance is installed in a bathroom when this must be sited outside the bathroom.

Legend:

SC002A

400

Discharge pipework

1) The tundish must be installed directly below the discharge outlet connection of the boiler.The tundish must also be in a position visible to the occupants, and positioned away from any electrical devices. The discharge pipe from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge and to be of metal.

2) Discharge pipes from the temperature & pressure relief are expansion relief valve are joined together within the appliance.

3) The pipe diameter must be at least one pipe size larger than the nominal outlet size of the safety device unless it's total equivalent hydraulic resistance exceeds that of a straight pipe 9m long. I.e. Discharge pipes between 9m and 18m equivalent resistance length should be at least 2 sizes larger than the nominal outlet size of the safety device. Between 18m and 27m at least 3 sizes larger, and so on. Bends must be taken into account in calculating the flow resistance. See fig. 2.4.1 and Table 1.

4) The discharge pipe must have a vertical section of pipe at least 300m in length, below the tundish before any elbows or bends in the pipework.

5) The discharge pipe must be installed with a continuous fall.

6) The discharge must be visible at both the tundish and the final point of discharge, but where this is not possible or practically difficult; there should be clear visibility at one or other of these locations.Examples of acceptance are: i) Ideally below a fixed grating and above the water seal in a trapped gully. ii) Downward discharges at a low level; i.e. up to 100mm above external surfaces such as car parks, hard standings, grassed areas etc. These are acceptable providing that where children may play or otherwise come into contact with discharges, a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility. iii) Discharges at high level;I.e. into a metal hopper and metal down pipe with the end of the discharge pipe clearly visible (tundish visible or not). Or onto a roof capable of withstanding high temperature discharges of water 3m from any plastic guttering systems that would take such a discharge (tundish visible). iv) Where a single pipe serves a number of discharges, such as in blocks of flats, the number served should be limited to not more than 6 systems so that any installation can be traced reasonably easily. The single common discharge pipe should be at least one pipe size large than the largest individual discharge pipe to be connected. If unvented hot water storage systems are installed where discharges from safety devices may not be apparent I.e.in dwellings occupied by the blind, infirm or disabled people, consideration should be given to the installation of an electronically operated device to warn when discharge takes place. Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges.

Warningr

The outlet from the temperature & pressure relief valve must not be used for any other purpose. The temperature & pressure relief valve must not be removed in any circumstances. Any of the above will totally invalidate the warranty.

Note

The discharge from the central heating and domestic hot water systems may be joined together after the tundish.

Temperature & pressure

Table 1. Sizing of copper discharge pipe

“D2” for common temperature valve outlet sizes.

WORKED EXAMPLE

The example below is for a G 1/2 Temperature & Pressure Relief valve with a discharge pipe (D2) having 4 no.elbows and length of 7m from the Tundish to the point of discharge.From Table 1 Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from G 1/2 T & P valve is 9m. Subtract the resistance for 4 no. 22mm elbows at 0.8m each = 3.2m. Therefore the maximum permitted length equates to: 5.8m.

As 5.8m is less than the actual length of 7m therefore calculate the next largest size. Maximum resistance allowed for a straight length of 28mm pipe (D2) from G 1/2 T & P valve equates to:18m. Subtract the resistance for 4 no. 28mm elbow at 1.0m each = 4m. Therefore the maximum permitted length equates to: 14m As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.

Fig. 2.4.1

SH005A

TB004A

relief valve

Metal discharge pipe (D1) from temperature & pressure relief valve. to tundish.

500 mm Max.

300 mm Min.

Metal discharge pipe (D2) from tundish with continuous fall. See Table 2 and worked example.

Tundish

Discharge below fixed grating. (see page 6 for alternative points of discharge).

Fixed grating

Trapped gulley

Valve outlet size Minimum size of

G 1/2 15 mm 22 mm

G 3/4 22 mm 28 mm

G 1 28 mm 35 mm

discharge pipe D1*

Minimum size of

discharge pipe D2*

from tundish

28 mm 35 mm

35 mm 42 mm

42 mm 54 mm

Maximum

resistance allowed,

expressed as a

length of pipe (i.e.

no elbow or bends)

Up to 9 m Up to 18 m Up to 27 m

Resistance created

by each elbow or

bend

0.8 m

1.0 m

1.4 m

1.0 m

1.4 m

1.7 m

1.4 m

1.7 m

2.3 m

400

Air Release Points:

These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system. The appliance has an integral sealed expansion vessel to accommodate the increase of water value when the system is heated. It can accept up to 7 l (1.5 gal) of expansion water. If the heating circuit has an unusually high water content, calculate the total expansion and add an additional sealed expansion vessel with adequate capacity.

Mains Water Feed - Central Heating:

There must be no direct connection to the mains water supply even through a non-return valve, without the approval of the Local Water Authority.

Filling:

A temporary method for initially filling the system and replacing lost water during servicing and initial filling (complying to current water regulations) must be provided. The flexible hose must be removed once the system has been filled.The D.H.W. inlet valve on the connection kit has two postions, one for winter and one for the summer. This enables the flow-rate through the appliance to be adjusted so that a sensible D.H.W. temperature may be achieved throughout the year.

Domestic Water

The domestic water must be in accordance with the relevant recommendation of BS 5546:1990. Copper tubing to BS EN 1057:1996 is recommended for water carrying pipe work and must be used for pipe work carrying drinking water.

Note: This appliance is capable of producing domestic hot water of up to

70˚C. For extra security against scalding a thermostatic blending valve may be installed on the domestic hot water outlet.

Secondary Return

The secondary return can be used as an option. A Non Return Valve (not supplied) must be fitted to prevent back flow and a Bronze Pump will be needed in conjunction with a Pipe Thermostat to circulate the hot water (both not supplied).

Residual Head of the Boiler

A: Gas inlet B: C.H.W.return C: C.H.W.flow D: D.H.W.secondary return E: D.H.W. flow F: D.H.inlet

1 - Gas meter inlet cock 2 - Gas meter 3 - Gas meter outlet cock 4 - Internal gas cock 5 - Appliance gas inlet cock 6 - D.W.inlet cock 7 - D.H.W.expansion vessel 8 - cock 9 - Secondary return pump

10 - Thermostat 11 - Time control clock 12 - Radiator control clock 13 - Holder 14 - Air release valve 15 - Drain valve 16 - T&P valve 17 - Safety valve 18 - Tundish

Fig. 2.5

Fig. 2.5.1

VR005A

SH006A

Flue System

The provision for satisfactory flue termination must be made as described in BS 5440-1. The appliance must be installed so that the flue terminal is exposed to outdoor air. The terminal must not discharge into another room or space such as an outhouse or lean-to. It is important that the position of the terminal allows a free passage of air across it at all times. The terminal should be located with due regard for the damage or discolouration that might occur on buildings in the vicinity. In cold or humid weather water vapour may condense on leaving the flue terminal. The effect of such “steaming”must be considered. If the terminal is less than 2 metres above a balcony, above ground or above a flat roof to which people have access, then a suitable terminal guard must be fitted.When ordering a terminal guard, quote the appliance model number. A suitable terminal guard is available from:

TOWER FLUE COMPONENTS Morley Road Tonbridge Kent TN9 1RA

The minimum acceptable spacing from the terminal to obstructions and ventilation openings are specified in Fig.2.6

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

TERMINAL POSITION mm A - Directly below an open window or other opening 300

B - Below gutters, solid pipes or drain pipes 75 C - Below eaves 200 D - Below balconies or car-port roof 200 E - From vertical drain pipes and soil pipes 75 F - From internal or external corners 300 G - Above ground or below balcony level 300 H - From a surface facing a terminal 600

I - From a terminal facing a terminal 1200

J - From an opening in the car port

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

Fig. 2.6

2.9 Flue Connections

400

In addition, it is also possible to use a split system by fitting a special adapter to the flue discharge collar and using one of the apertures for the air vent intake located on the top part of the combustion chamber (A).

Fig. 2.8

Fig. 2.7

FU010A

FU011A

FU012A

In Fig. 2.11 below, several different types of flue systems are shown. For additional information regarding the flue accessories, please consult the Flue Pipe Accessories manual.

Fig. 2.11

In calculating the lengths of the pipes, the maximum length must also take into consideration the values for the exhaust/air intake end terminals, as well as 90° elbows for coaxial systems.

The C52 types must comply with the following requirements:

1. The discharge/intake vent pipes must have the same diameter of ø 80 mm.

2. If an elbow is inserted into the discharge/ventilation system, the calculation of the overall extension must take into consideration the values for each curve, as indicated in the table.

3. The exhaust pipe must extend at least 0.5 m above the ridge of the roof if it is located on a side other than that for the air intake (this is not obligatory if the exhaust and air intake pipes are located on the same side of the building).

(*) L = Length of Piping

C12 (xx) 4 m ø 60 /100 NO Coaxial System C32 (xx) 4 m ø 60 /100 NO

C42 (xx) 4 m ø 60 /100 NO

C12 (xy) 34 m ø 80 L < 4.5 m L > 6.6 m

C32 (xy) 34 m ø 80 L < 4.5 m L > 6.6 m

Split

Systems C42 (xy) 34 m ø 80 L < 4.5 m L > 6.6 m

C52 (xy) 56 m ø 80 L < 8 m L > 5.8 m

Maximum Extension

Exhaust/Air

Exhaust T ype

Diameter of Pipes

(mm)

Use of ø 42 mm Restictor

on Delivery Side

Risk of Condensation

Forming

400

This procedure must be done as follows: 1 - Remove the air vent intake in the area

indicated in Fig. 2.9, by breaking the perforated ring.

2 - Use a tool to grasp the lid and remove

it completely.

3 - Clean any burrs or sharp edges with a

knife or an appropriate tool.

Fig. 2.9

Fig. 2.10

FU013A

FU014A

400

2.10 Room Thermostat Connection

In order to perform this procedure, remove the boiler casing as indicated in section 3.2.Then proceed as follows:

1 Rotate down the control panel.

2 Open the cover “A”on the left hand side of the compartment.

3 Insert the wire for the connection of the room thermostat into the cable

clamp “B”, as indicated in photo 3.

4 Remove the grommet “C”shown in the photo 4, make a hole in it and pass

the room thermostat wire through.

5 Remove the link located in the terminal block and connect the wire.

6 Replace the grommet and the terminal block to their original positions,

close the cover on the grommet compartment and fasten the wire-clamp “B”in

place.

7 If a remote time clock is to be fitted, disconnect the integral time clock plug

from the P.C.B.

8 Using a volt-free switching time clock, connect the switching wires from the

time clock following points 1-6 above.

9 If using a time clock and room thermostat, these must be connected in

series as per points 1-8 above.

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

An anti-frost device is built-in to the appliance’s electronic regulation system.

TA001A

2.11 Electrical Diagram

Legend:

A T = High V oltage P.C.B. BT = Low Voltage P.C.B.

A = Remote Connector Kit B = Flame Failure L.E.D. C = Insufficient Water Pressure L.E.D. D = Water Temperature Indicator L.E.D.s E = Overheat Thermostat Warning L.E.D. F = System Reset Button G = Selector Knob for Operating Mode H = Domestic Hot Water Temp. Adjustment I = Central Heating Temp. Adjustment J = Wire Connector for Room Thermostat K = Connector for Total Check System L = Selector for Local/Remote Control M = Anti-cycling Device Adjustment for Heating N = Soft-light Adjustment O = Max Heating Temperature Adjustment P = Time Clock Connection Q = On/Off L.E.D. R = On/Off Switch S = Interface Wire for P.C.B.s T = Relay Motorised Valve U = Ignitor Relay V = Gas Valve Relay W = Fan Relay X = Circulation Pump Relay Y = Selector TCS2 Z = Link for Continuous Pump Run

A01 = Air Pressure Switch A02 = Fan A03 = Gas Valve A05 = Motorised Valve A06 = Circulation Pump A07 = Flame Detector A08 = Earth Terminal

B01 = Over Heat Thermostat B02 = External Thermostat B03 = Gas Valve Modulator B04 = D.H.W. Probe Sensor Cylinder B05 = Heating Sensor B06 = Pressure Switch for Heating Circuit B07 = Minimum pressure switch

Colours

Gry = Grey Rd = Red Bl = Blue Grn/Yll = Yellow/Green Wh = White Brn = Brown Blk = Black Wh/Rd = White/Red

400

SE003A

Heating

D.H.W.

Heating

+ D.H.W.

Flue Test operating modes

400

2.12 Water Circuit Diagram

Legend:

1. Air Pressure Switch

2. Fan

3. Main Heat Exchanger

4. Ignition Electrodes and Detection Electrodes

5. Burner

6. Gas V alve

8. Spark Generator

7. Automatic air release valve

8. Circulation Pump

9. Motorised Valve with by-pass

10. Main Circuit Flow Switch

11. Safety Valve (3 bar)

12. Low pressure switch

13. C.H.expansion Vessel

14. D.H.W. expansion V essel

15. D.H.W.Storage with insulation shell

16. D.H.W.Probe

17. Expansion relief valve (6 bar)

18. Temperature/Pressure relief valve (7bar)

19. Magnesium anode

20. C.H.W.Probe

21. Overheat Thermostat

22. Drain point

SI003A

22 21 20

4 5

6 7

11 13 14 15 1612

400

3. COMMISSIONING

3.1 Initial Preparation

MTS (GB) Limited support the initiative.Within the information pack you will find a copy of the logbook. It is important that this is completed in the presence of your customer, they are shown how to us it, and it is signed by them. Please instr uct your customer that they must have their logbook with them whenever they contact a service engineer or us.

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

Filling the Heating System:

Remove the panels of the case and lower the control panel (see point 3.2.for further information). Open the central heating flow and return cocks supplied with the connection kit. Unscrew the cap on the automatic air release valve one full turn and leav e open permanently. Close all air release valves on the central heating system. Gradually open valve(s) at the filling point (filling-loop) connection to the central heating system until water is heard to flow, do not open fully. Open each air release tap starting with the lower point and close it only when clear water, free of air, is visible.

Purge the air from the pump by unscrewing anticlockwise the pump plug and also manually rotate the pump shaft in the direction indicated by the pump label to ensure the pump is free.

Close the pump plug. Continue filling the system until at least 1.5 bar registers on the pressure gauge. Inspect the system for water soundness and remedy any leaks discovered.

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 it only when clear water, free of bubbles, is visible

Gas Supply:

Inspect the entire installation including the gas meter, test for soundness and purge, all as described in BS 6891:1988. Open the gas cock (supplied with the connection kit) to the appliance and check the gas connector on the appliance for leaks. When the installation and filling are completed turn on the central heating system (sect.

3.4) and run it until the temperature has reached the boiler operating temperature. The system must then be immediately flushed through. The flushing procedure must be in line with BS 7593:1992 Code of practice for treatment of water in domestic hot water central heating systems. During this operation, we highly recommend the use of a central heating flushing detergent (Fernox Superfloc or equivalent), whose function is to dissolve any foreign matter that may be in the system.

Substances different from these could create serious problems to the pump or other components.

The use of an inhibitor in system such as Fernox MB-1 or equivalent is strongly recommended to prevent corrosion (sludge) damaging the boiler and system.

Failure to carry out this procedure may invalidate the appliance warranty.

3. 2 Removing the Casing

VR006Aa

VR006Ab

VR006Ac

400

The boiler was designed to make regulation easy. To access the adjustment and control area, simply remove the cover by unscrewing the screws “A” and “C” and lift up the small service panels “B1” and “B2” respectively. The first provides access to the control (low voltage) P.C.B., while the second makes it possible to work on the power supply P.C.B.The service panel “B2” also provides access to:

- the power supply cord connector;

- the fuses;

- the selector knob for continuous operation of the circulation pump. The service panel “B1” also provides access to:

- the potentiometer for regulating the ignition delay (anticycling) feature, which can be set from 0 to 2 minutes (factory set at 1 minute);

- the potentiometer for regulating the soft-light feature , the set-

3.4 Initial Start-up

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 the system is full;

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

-Check to see whether 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 pressing the On/Off switch <L> - the L.E.D. “I” will turn on - turn the selector knob “C” to the <

winter> setting. This will start the circulation pump. After 7 seconds, the boiler will signal a shut- down due to failure ignition. Leave the boiler as it is until all of the air has been bled from the lines.

-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. Check the exhaust flue for the fumes produced by combustion.

3. Make sure that all gate valves are open;

4. Turn on the gas cock and check the seals on the connections, including the one for the burner, making sure that the meter does not signal the passage of gas. Check the connections with a soap solution and eliminate any leaks.

5. Press the reset button “A” for the lighting system; the spark will light the main burner.If the burner does not light the first time, repeat the procedure.

6. Check the minimum and maximum pressure values for the gas going to the burner; adjust it if needed using the values indicated in the table in section 4. (See sect of the servicing manual).

3.5 Operational Adjustments

3.3 Control Panel

Legend:

Ignition Faliure Reset/Safety Thermostat Reset

B L.E.D. for Ignition Faliure C Selector Knob for Summer/Winter/

Flue T est Modes

D L.E.D. for Insufficient System Pressure E Domestic Hot Water Temperature Control F Central Heating Temperature

Indicating Leds

G L.E.D. for Safety Thermostat (overheating) H Heating Temperature Adjustment Knob I L.E.D.for ON/OFF Switch L ON/OFF Switch O Heating System Pressure Gauge

* Warning the flue analysis mode must only be selected by a qualified service engineer.

FR004A

FO005A

The boiler is equipped with the following safety systems (see section 3.3 for references):

1. - Ignition Failure

This control signals an ignition failure on the burner 7 seconds after a lighting failure. The L.E.D.“B” will turn on to signal the shutdown status. The system can be reset by pressing and releasing the button “A” after checking to make sure that the gas valve is open.Repeat this process until the burner lights.

2. - Circulation Failure

This control signals that the safety pressure switch on the primary circuit has not sensed a pressure of at least 1.5 bar within 40 seconds of the activation of the circulation pump, it shuts off the boiler and lights the L.E.D. “D” The system can be reset (after the pressure has been brought up to the proper level) by using the On/Off switch “L”.

3. - Overheating

This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 110°C.The L.E.D. “G” will come on to signal this shut-off status. After the system has been allowed to cool, the system can be reset by pressing the button “A”.

4. - Anti-frost Device

The boiler is equipped with a device that automatically lights the main burner when the temperature in the delivery line to the system drops below 5°C. The boiler will continue to operate until the temperature in question reaches about 58°C. This device is activated on a properly operating boiler if:

- the system pressure is between the acceptable values;

- the power supply to the unit is on;

- the unit is supplied with gas. This feature is enabled also when the boiler is in summer operating mode.

5. - Safety Shut-off

At the start of every lighting phase, the P.C.B. performs a series of inter nal controls. If a malfunction occurs, the boiler will shutdown until the problem has been resolv ed.

3.8 Boiler Safety Systems

3.6 Combustion Analysis

The boiler is designed to make it easy to analyse the combustion byproducts. Using the especially designed apertures, readings can be taken on the temperature of the combustion by-products and of the combustion air, as well as of the concentrations of O

and CO2, etc.

The best maximum-power test conditions for the heating system are when the selector “C”is turned to the flue analysis setting.

The discharge/ventilation of the exhaust fumes can be monitored to check for losses in general pressure in the system.This is done to eliminate the cause of lighting failure with the main burner not indicated by a shutdown status. With a differential manometer connected to the test socket on the combustion chamber, the DP value for the air pressure switch can be taken. The measured value should not be less than 10 mbar under maximum thermal power conditions (with the knob “C”on the flue test setting) in order for the unit to function properly and without interruption.

3.7 Fume Discharge

Monitoring

400

ting for which can range from the minimum thermal power to the maximum:

- the potentiometer for the maximum thermal power for the heating system, maximum thermal power setting (factory set at the maximum value, unless indicated otherwise on the adhesive sticker located in proximity to the potentiometer);

- The connection to the diagnosis device (TCS).

G20 5 mbar G30-31 19 mbar

DC005A

FU016A

3.9 Draining the System

Draining the heating system.

The heating system must be emptied as follows:

- Turn off the boiler;

- Open the drain valve for the system and place a container below to catch the water that comes out;

- Empty the system at the lowest points (where present).If you plan on not using the heating system for an extended period of time, it is recommended that you add antifreeze with an ethylene glycol base to the water in the heating lines and radiators if the ambient temperature drops below 0°C during the winter.

This makes repeated draining of the entire system unnecessary.

Draining the domestic hot water system.

Whenever there is the danger of the temperature dropping below the freezing point, the domestic hot water system must be drained as follows:

- Turn off the general water valve for the 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).

400

5. Adjust the soft-light feature;

6. Adjust the delayed lighting feature for the heating system (can be set from 0 to 2 mins.).

CATEGORY II2H3+ Methane Gas Liquid Butane Gas Liquid Propane Gas

G20 G30 G31

Recommended Soft-light Pressure (mbar) 5-5.4 13.4 13.4

Lower Wobbe Index (15°C;1013mbar) MJ/m3h 45.67 80.58 70.69 Nominal Delivery Pressure mbar 20 30 37 Minimum Delivery Pressure mbar 17 20 25

GENUS 27 BFFI PLUS

Main Burner: n. 15 jets (ø) mm 1.25 0.72 0.72 Consumption (15°C; 1013mbar) m

/h 3.16 ---- ---Consumption (15°C; 1013mbar) Kg/h ---- 2.35 2.32 Gas Cock Outlet Pressure max - min mbar 11.0- 2.0 (*) - 5.0 (*) - 7.0

4. GAS ADJUSTMENTS

(1mbar = 10,197column of water) The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid.The maximum pressure of the gas to the burner will be equal to the nominal delivery pressure minus the head loss within the gas valve.

CATEGORY II2H3+ Methane Gas

G20

Liquid Butane Gas

G30

Liquid Propane Gas

G31

4.1 Changing the Type of Gas

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;

400

It is recommended that the following checks be made on the boiler at least once a year:

1 - Check the seals for the water connections;replacement of any faulty seals. 2 - Check the gas seals;replacement of any faulty gas seals. 3 - Visual check of the entire unit. 4 - Visual check of the combustion process and cleaning of the burners if needed. 5 - If called for by check no.3, dismantling and cleaning of the combustion chamber. 6 - If called for by check no.4, dismantling and cleaning of the injectors. 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 and full load. 9 - Check of the heating safety systems:

-safety device for maximum temperature;

-safety device for maximum pressure.

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 instructions

in the manual). 12 - Check of domestic hot water production efficiency (delivery rate and temperature) 13 - Check pressure in the Domestic Expansion Vessel and top up as necessary. 14 - Check manually by turning the test knob the Temperature & Pressure Relief Valve. 15 - Check manually by turning the test knob the Expansion Relief Valve. 16 - Check discharge pipes from both the central heating and domestic hot water

for obstructions. 17 - Check of the general performance of the unit. 18 - General check of the discharge/ventilation of the combustion by products.

5. MAINTENANCE

400

Cod. 23 99 84 1516 000

29.8/12.0

27.4/10.3

92.1

88.8

1.1

6.8

0.4

56.9

1.3

3.16

2.35/2.32

136.9

7.27

7.45 55

82/42

40/70

0.2/6 7 1

145

30-37

230 / 50

200

X4D

2A 86

47-116-11

GENUS 27 BFFI PLUS

CE Certification Thermal Capacity max/min kW Thermal Power max/min kW Efficiency of Nominal Thermal Capacity % Efficiency at 30% of Nominal Thermal Capacity % Heat Loss to the Shell (∆=50°C) % Flue Heat Loss with Burner Operating % Flue Heat Loss with Burner Off % Maximum Discharge of Fumes (methane) Kg/h Residual Discharge Head mbar Consumption at Nominal Catacity (G20-G25) m

/h (15°C, 1013 mbar) (G30-G31) Kg/h Temp. of exhaust fumes at nominal capacity with methane °C CO

Content % O2 Content % CO Content ppm

Minimum Ambient Temperature °C Heating Temperature max/min °C Stored D.H.W.Cylinder Capacity l Stored D.H.W.min/max Temperature max/min °C Specific flow rate*

(IN 10’∆T=30°C) l/min

D .H.W .Expansion Vessel l Pressure of Domestic Hot Water max/min bar Expansion V essel Capacity l Preload Charge bar Maximum Water Content in System l Maximum Heating Pressure bar Nominal Pressure Natural Gas (G20) mbar

Liquid Gas (G30/G31) mbar Voltage/Frequency of Power Supply V/Hz Total Electrical Power Absorbed W Protection Grade of Electrical System IP Internal Fuse Rating Weight Kg

GC Number

6. TECHNICAL INFORMATION

*BS EN 625

Manufacturer: Merloni TermoSanitari SpA - Italy Commercial subsidiary: MTS (GB) LIMITED

MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT

Telephone:(01494) 755600 Fax:(01494) 459775 Internet: http://www.mtsgb.ltd.uk E-mail: info@mtsgb.ltd.uk

Technical Service Hot Line: (01494) 539579

Servicing Instructions Type C Boilers G.C.N: 47-116-11

LEA VE THESE INSTRUCTIONS WITH THE END USER

1. SERVICING INSTRUCTIONS

1.1 Replacement of Parts

1.2 To Gain General Access

1.2.1 Removing the front panel

1.2.2 Removing side panels

1.2.3 Removing the control panel door

1.3 Access to the Combustion Chamber

1.3.1 Removing the sealed chamber front cover

1.3.2 Removing the combustion cover

1.3.3 Removing the burner and injectors

1.3.4 Removing the electrodes

1.3.5 Removing the main heat exchanger

1.3.6 Removing the air pressure switch

1.3.7 Removing the fan

1.4 Ser vicing and Removal of the Gas Valve

1.4.1 Setting gas pressures

1.4.2 Removing the spark generator

1.4.3 Removing the gas valve

1.5 Access to the Water Circuit

1.5.1 Removing the main flow switch

1.5.2 Removing the pump pressure switch

1.5.3 Removing the safety valve

1.5.4 Removing the automatic air vent

1.5.5 Removing the pump

1.5.6 Removing the pressure gauge

1.5.7 Removing the expansion vessel

1.5.8 Removing the overheat thermostat

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

1.5.10 Removing temperature and pressure relief valve

1.5.11 Removing the D.H.W. probe

1.5.12 Removing the diverter valve

1.6 Access to the Control System

1.6.1 Checking the Fuses

1.6.2 Removing the Time Clock

1.6.3 Removing the P.C.B.s

2. FAULT FINDING

2.1 Fault Finding Guide (Flow-chart)

3. ELECTRICAL DIAGRAMS

4. SHORT SPARE PARTS LIST

TABLE OF CONTENTS

1. SERVICING INSTRUCTIONS

The life of individual components vary and they will need servicing or replacing as and when faults develop. The fault finding sequence chart in chapter 2 will help to locate which component is the cause of any malfunction, and instructions for removal, inspection and replacement of the individual parts are given in the following pages.

1.1 Replacement of Parts

1.2 To Gain General Access

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

Before starting any servicing work, ensure both the gas and electrical supplies to the boiler are isolated and the boiler is cool.

Before and after servicing, a combustion analysis should be made via the flue sampling point (please refer to the Installation Manual for further details).

After servicing, preliminary electr ical system checks must be carried out to ensure electrical safety (i.e. polarity, earth continuity, resistance to earth and shor t circuit).

Fig. 1.1

Fig. 1.2

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

1.2.1 Removing the front pannel:

1. Remove the screw “A”from the centre of the top edge of the

front panel and remove the panel by lifting upw ard

(see fig. 1.1);

2. Remove the front panel from the rest of the casing

(see fig. 1.2).

1.3.1 Removing the sealed chamber front cover

1. Remove the screws “D”(see fig. 1.5)

Fig. 1.5

1. Release the two connection nuts “E”;

2. Remove the six screws “F”(see fig. 1.6);

3. Pull forward and remove.

1.3.2 Removing the combustion cover

Fig. 1.6

1.3 Access to the Combustion Chamber

1.2.2 Removing the side panels:

1. Remove the screws “B” lift outward at the base and then lift

off the locating lugs(see fig. 1.3);

Fig. 1.3

Fig. 1.4

1.2.3 Removing the control panel door :

Open the control panel door and remove screws “C” (see fig. 1.4);

1.3.4 Removing the electrodes

1. Remove the burner (see fig.1.10);

2. Remove the screws “H” and disconnect the electrode

cables slide the electrodes gently downwards (see fig.

1.11-1.12

);

3. Disconnect the detection electrode cable at its only connection point close to the P.C.B. (see fig. 1.13);

1. Undo the nut “G” of the gas pipe (see fig. 1.7) ;

2. Lift up the main burner to free the main gas

connection and pull forward very carefully (see fig. 1.8);

3. Remove the injectors (see fig.1.9);

1.3.3 Removing the burner and the injectors

Fig. 1.7

Fig. 1.8

Fig. 1.9

Fig. 1.10

Fig. 1.11

Fig. 1.12

Fig. 1.13

To replace, repeat the steps in reverse order, paying particular attention to the following: a -Centre the electrode

in the locating hole carefully, otherwise the electrode may break;

b -Check that the cables

have been connected correctly.

Fig. 1.15

1. Drain the boiler of water ;

2. Release the connection nut “I” connecting the

exchanger to the flow pipes (see fig.1.14);

3. Lower the heat exchanger at its front end and lift forward clear of the ledge at the rear

(see fig.

1.15)

4. Pull it straight out.

1.3.5 Removing the main heat exchanger

Fig. 1.14

1. Remove screws “L” on the top of the sealed cham-

ber

(see fig. 1.17);

2. Pull upwards the plastic support plug (see fig. 1.18)

3. Disconnect the electrical connections “J” and sili-

cone pipes “K” from their connection points (see fig.

1.16);

1.3.6 Removing the air pressure switch

Fig. 1.16

Fig. 1.18

Fig. 1.17

1. Remove the screws “M” (see fig. 1.19);

2. Remove the collar for flue discharge (see fig.

1.20);

3. Disconnect electrical connections ”N”, the silicone pipe “O” and remove screw “P”

(see fig.1.21);

4. Pull fan and remove (see fig.1.22);

1.3.7 Removing the fan

Fig. 1.19

Fig. 1.20

Fig. 1.21

Fig. 1.22

1.4 Servicing and Removal of the Gas Valve

Setting the minimum and the maximum power of the boiler

Check that the supply pressure to the gas valve is a minimum of 20 mbar for natural gas.

2. To do this, remove the screw “A” (Fig. a). Fit the pipe of the pressure gauge to the pressure connection of the gas valve

“B”. When you have completed this operation, replace the screw “A” securely into its housing to seal off the gas.

3. To check the pressure supplied by the gas valve to the burner, remove the screw “C” (Fig. b). Fit the pipe of the pressure gauge to the pressure outlet of the gas valve “D”. Disconnect the compensation pipe either from the gas valve or from the sealed chamber.

4. Set the On/Off button to position < I > and the "summer/winter" switch to the flue test position. Turn on the hot water tap and allow the hot water tap to run at full rate. Adjust nut “E” (Fig. c) on the modureg to set the maximum gas pressure (displayed on the pressure gauge) turn the screw clockwise to increase the pressure and counter-clockwise to decrease, corresponding to the maximum power (see tab

le “A” page 8).

5. To set the minimum power, disconnect a supply lead from the modureg and adjust screw “F” (Fig. d) whilst holding the outer nut. Turn the screw clockwise to increase the pressure and counter-clockwise to decrease the pressure (displayed on the pressure gauge) corresponding to the minimum power (see tab

le “A” page 9).

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

Setting the maximum heating circuit power

7. To set the maximum heating circuit power, place the

On/Off button to position < I > and the "summer/winter" switch to winter position. Turn the knob of the heating thermostat clockwise to maximum;

8. Remove the left hand inspection panel of the P.C.B. and fit a small

cross-head screwdriver in to the right hand potentiometer.Turn clockwise to increase the pressure or counter-clockwise to reduce the pressure. Adjust the setting to the required heating pressure value (displayed on the pressure gauge), as indicated in the diagrams 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 from the P.C.B. (see fig.

1.13). Start the boiler and during the ignition sequence adjust the centre potentiometer until the gas pressure reads the required gas pressure as per the table below. Once the gas pressure is set turn off the boiler and reconnect the connection to the P.C.B. NB.:It may be necessary to reset the flame failure reset a number of times during this operation.

1.4.1 Setting gas pressures

Fig. a

Fig. b

Fig. c

Fig. d

VG001Aa

VG001Ac

VG001Ab

VG001Ad

TB001A

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

Recommended pressure for slow ignition

5 mbar - 1.95 in w.g.

18 mbar - 7.0 in w.g. 19 mbar - 7.4 in w.g.

Regulating the heating power for natural gas (G20)

Regulating the heating power for butane gas (G30)

Regulating the heating power for propane gas (G31)

TABLE “A”

TB002A

CG003A

CG002A

CG003A

GAS BURNER PRESSURE

40 38 36 34

GAS BURNER PRESSURE

GENUS 27 BFFI PLUS

Anti-cycling

Device

Soft-light

Adjustment

Max Heating

Adjustment

1.4.2 Removing the spark generator

Fig. 1.23

Fig. 1.25

Fig. e

1. Disconnect ignition leads “Q”by pulling upwards (see fig.

1.23);

2. Remove the scre w “R”(see fig.1.24) with a Pozidrive No. 2 star tip screwdriver;

3. Remove the spark generator by pulling forwards (see fig.

1.25);

10.Remove the pipe from the pressure gauge and connect screw “C” to the pressure outlet in order to seal off the gas.

11.Carefully check the pressure outlets for gas leaks (valve inlet

and outlet).

12. Reconnect the compensation tube to the gas valve.

IMPORTANT!

Whenever y ou disassemb le and reassemble the gas connections, always check for leaks using a soap and water solution.

Setting the anti-cycling device

This appliance is equipped with a potentiometer which delays the ignition of the heating control and is situated on the P.C.B.(see the electrical diagrams). By adjusting the potentiometer, it is possible to change the time interval between the burner shutting down and its next ignition. It is preset at 1 minute and can be adjusted from 0 to 2 minutes. Use this control in particular situations where continuous shutting down and ignition of the main burner occurs.

Fig. 1.24

FR010A

SM04A

1.5 Access to the Water Circuit

Important! Before any component is removed, the boil-

er must be drained of all water.

Important. ensure gas supply to boiler is turned off.

Removing the gas valve

Disconnect the cables from the solenoid and modureg;

2. Remove the spark generator (see section 1.4.2);

3. Release the nuts “S” using a 30 mm open ended

spanner (see fig. 1.26 - 1.27);

4. Remove the gas valve (see fig.1.28).

1.4.3 Remo

ving the gas valve

1.5.2 Removing the pump pressure switch

1. Remove the cab le of the pump pressure s witch “V”

(see fig. 1.30)

2. Unscrew the pump pressure switch by using a spanner on the nut “X”

(see fig. 1.31);

3. Remove the pump pressure switch.

1.5.1 Removing the “main circuit flow switch”

1. Remove the cab le of the main circuit flow switch “T”

(do not pull the wires);

2. Remove the screws “U” (see fig. 1.29);

3. Remove the main circuit flow switch.

Fig. 1.26

Fig. 1.27

Fig. 1.28

Fig. 1.29

Fig. 1.30

Fig. 1.31

1.5.4 Removing the automatic air vent

1. Remove the automatic air vent “Z” by

unscrewing from the pump (see fig. 1.33);

1.5.5 Remo

ving the pump

1.5.6 Removing the pressure gauge

1. Remove electrical connectione “A1”

(see fig. 1.34).

2. Disconnected the two nuts “A2”(see fig. 1.34);

3. Remove the pump.

1. Remove the pressure gauge cover by pulling

(see fig. 1.35);

2. Release coupling “A3” using a 14 mm open ended spanner (see fig. 1.36);

3. Push the pressure gauge through the control panel from the rear

(see fig. 1.37).

1.5.3 Removing the safety valve

1. Remove the pump pressure switch

(see section 1.5.2)

2. Loosen nut “Y” disconnect the safety discharge pipework from under the boiler

(see fig. 1.32);

3. Remove the valve.

Fig. 1.32

Fig. 1.34

Fig. 1.36

Fig. 1.35

Fig. 1.33

Fig. 1.37

Important. Turn off the domestic cold water and

drain the storage cylinder.

Remove nut “A4” away from the expansion vessel (see fig. 1.38);

2. Remove screws “A5” (see fig. 1.39);

3. Remove expansion vessel (see fig. 1.40).

1. Remove the electrical connector from the over-

heat thermostat

(see fig. 1.41);

2. Pull off the thermostat connections.Then remove the thermostat from the pipe by releasing it’s securing clip.

1. Remove the electrical connector by pulling off the thermostat connections (see fig. 1.42) and unscrewing the sensor probe with a 14 mm open ended spanner

(see fig. 1.43).

1.5.7 Removing the domestic expansion vessel 1.5.8 Removing the overheat thermostat

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

Fig. 1.38

Fig. 1.39

Fig. 1.40

Fig. 1.41

Fig. 1.42

Fig. 1.43

1.5.11 Removing the D.H.W. probe1.5.10 Temperature and pressure relief valve

This operation is possible with boiler fully assembled. The D.H.W.probe access, is at the bottom right side of the boiler:

1. Ensure electr icity is switched of at main isolator.

2. Hold the D.H.W.probe spring and pull downwards

(see fig. 1.46)

3. Remove the spring (see fig. 1.47)

4. Disconnect the probe;

5. Replace with new D.H.W. probe;

6. Mount the spr ing;

7. Introduce new probe into its housing pushing

upwards;

8. Ensure the probe has reached the end of the housing pushing firmly again.

1. Ensure electricity is s witched off at main isolator;

2. Drain domestic water from cylinder;

3. Loosen nut “A6” and remove the 1/2” nipple

(see fig. 1.44);

4. Remove the valve by unscre wing in an anticlockwise direction (see fig. 1.45);

Fig. 1.47

Fig. 1.45

Fig. 1.44

Fig. 1.46

1. Remove the right hand inspection cover (see fig.

1.49)

;

2. Remove fuse from the P.C.B. (see fig. 1.50).

1.6 Access to the Control System

1. Remove electrical connections “A7” of the clock

(see fig. 1.51);

2. Unscrew the screws “A8” and remove (see fig.

1.52).

Fig. 1.49

Fig. 1.50

Fig. 1.51

Fig. 1.52

N.B.: It is possible to by-pass the time clock in the event of

failure by simply unplugging the electrical connection from the P.C.B..This will revert control of the central heating to the room stat connection on the reverse of the control panel.

1.6.1 Checking fuse

1.6.2 Remo

ving the time clock

1.5.12 Removing the diverter valve

1. Remove the circlip and pull the diverter valve to

the left.

(see fig. 1.48);

2. Remove electrical connection by pulling.

Fig. 1.48

1. Isolate electricity;

2. Remove the front cover of the boiler;

3. Remove both left and right inspection panels by

remove the screws “A9” (see fig. 1.51);

4. Remove the pressure gauge cover;

5. Remove the five screws retaining the facia panel;

6. Disconnect the connection cable”A10” (see fig.

1.52);

7. To remove the 24V P.C.B.: remove the electrical plug connectors and screws “A11” (see fig. 1.53);

8. To remove the 240V P.C.B.: remove the electrical plug connectors and screws “A12” (see fig. 1.53);

9. Replace either P.C.B. in reverse order.

Fig. 1.51

Fig. 1.52

Fig. 1.53

A10

A11

1.6.3 Remo

ving the P.C.B.s

A11

A12

PRELIMARY CHECKS

MAKE SURE THAT:

THE POWER

L.E.D.

ON?

POSTION

OF THE

SELECTOR

ES TAT ED.H.W.

Only Mode

NONO

YESYES

FUME DISCHARGE FUME DISCHARGE TESTTEST

HEAHEATING ANDTING AND

D.H.M..H.M. MODE MODE

HEAHEATINGTING

ONLONLY MODEY MODE

YESYES

NONO

YESYES

1 - Check the fuses 2 - Check the power supply cord, plug and outlet 3 - Check/replace the power supply P.C.B.

Press the

On / Off Button

D.H.W. IS

BEING DRAWN?

D.H.W. IS

BEING DRAWN?

FOR BOILERS

WITH ELECTRONIC

ANTI-FROST DEVICE:

PROTECTION IS ACTIVATED

IF HEATING TEMP

IS < 5

FOR BOILERS

WITH ELECTRONIC

ANTI-FROST DEVICE:

PROTECTION IS ACTIVATED

IF HEATING TEMP

IS < 5

MUST

TIME CLOCK

AND/OR ROOM

THERMOSTAT

BE ACTIVATED?

1 - There is sufficient water in the system 2 - The gas is turned on 3 - The electrical supply is turned on

1 - Check/reset system pressure 2 - Check/restore gas supply 3 - Check/replace short circuited heating probe 4 - Check/replace siezed pump

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

1.7 Fault finding guide (flow-chart)

FAULT FINDING

FC001Aa

DOES THE

CIRCULATION PUMP

COME ON?

YES

POWER T O

THE PUMP?

DOES THE

INSUFFICIENT WA TER

INDICATOR LIGHT COME

ON? (within

40 sec.)

1 - Check if there is air in the system 2 - Check main circuit flow switch operation 3 - Check pressure on the water gauge and fill system to return to 1 bar

1 - Turn the boiler off then on (protection reset)

1 - Check that the pump is not stuck 2 - Replace circulation pump

1 - Check wiring 2 - Check/replace wire to pump from PCB 3 - Replace power supply PCB

4)- Replace control PCB

5)- Check DHW probe when drawing DHW (at least 1 minute) in DHW only mode or in heating and DHW mode

FC001Ab

IS THE FAN

RUNNING?

BOILER

SHUTDOWN?

POWER

TO FAN?

YES

1 - Check/replace different pressure switch for pump 2 - Check/replace wiring 3 - Check/replace P.C.B. wire 4 - Check/replace power supply PCB 5 - Check/replace control PCB

1 - Check/replace air pressure switch/wiring 2 - Check whether reset button in stuck 3 - Check/replace flame detection electrode

1 - Check/replace 2 - Check/replace P.C.B. wire 3 - Check/replace power supply PCB 4 - Check/replace air pressure switch

1 - Replace fan

1 - Reset the boiler

PUMP PROTECTION

ACTIVATED?

INTERNAL

P.C.B. PROTECTION

ACTIVATED?

FC001Ac

IS THE BURNER

ALIGHT?

YES

1 - Check/replace igniter plugs 2 - Check wiring 3 - Check spark generator 4 - Check small wire 5 - Check power supply PCB 6 - Check control PCB

1 - Check if flame strikes detection electrode 2 - Check soft-light gas pressure 3 - Check/replace detection electrode 4 - Check the power P.C.B. 5 - Check the control P.C.B.

1 - Check supply of gas to gas valve 2 - Check power supply P.C.B. 3 - Check control P.C.B. 4 - Check modureg

Shutdown L.E.D. off

Restart of the fan

IS THE

AIR PRESSURE SWITCH

ACTIVATED?

IS FLUE

DISCHARGE

NORMAL?

HAS THE

BOILER SAFETY

SHUTDOWN BEEN

ACTIVATED?

WAS THE

RESET SWITCH

PRESSED?

1 - Check flue discharge 2 - Check venturi & small pipes 3 - Check wire for air press.switch 4 - Check/replace air press.switch 5 - Check/replace PCB wire 6 - Check/replace power PCB 7 - Checl/replace control PCB

FC001Ad

THERE STILL

A PROBLEM?

FUNCTIONS

NORMALLY

YES

LIST OF PROBLEMS POSSIBILE CAUSES

Delivery of hot water for domestic use: when the tap is turned on, the bumer goes out.

Delivery of hot water for domestic use: the radiators are heated in summer mode

Delivery of hot water for domestic use: water temperature is not satisfactory.

Delivery of hot water for domestic use: noisy operation.

Drop/increase in pressure in primary circuit.

Repeated shutdowns.

Safety thermostat is triggered repeatedly.

Temperature of radiators not satisfactory.

- air in secondary heat exchanger

- faulty main circuit flow switch

- faulty D.H.W. probe

- faulty 3-way valve

check sensor for domestic and heating water

- check gas settings and regulation

- check water flow rate

- check DHW storage

- primary exchanger is defective

- low water pressure in heating system

check gas settings and regulation

check D.H.W. probe

- check for leaks in heating circuit

- defective water filling loop

- check DHW storage

- expansion vessel is empty

- faulty detection electrodes

check gas settings and regulation

- check electric circuit for flame detection

Faulty (contacts) ntc sensor-heating/hot water

- Defective (poorly calibrated) safety thermostat

- Presence of air in the primary water circuit

- check ntc sensor for heating

- check by-pass

- check gas settings and regulation

FC001Ae

ELECTRIC DIAGRAMS

Legend:

AT = High Voltage P.C.B. BT = Low Voltage P.C.B.

A = Remote Connector Kit B = Flame Failure L.E.D. C = Insufficient Water Pressure L.E.D. D = Water Temperature Indicator L.E.D.s E = Overheat Thermostat Warning L.E.D. F = System Reset Button G = Selector Knob for Operating Mode H = Domestic Hot Water Temp. Adjustment I = Central Heating Temp. Adjustment J = Connector for Time Clock K = Connector for Total Check System L = Selector for Local/Remote Control M = Anti-cycling Device Adjustment for Heating N = Soft-light Adjustment O = Max Heating Temperature Adjustment Q = On/Off L.E.D. R = On/Off Switch S = Interface Wire for P.C.B.s T = Relay Motorised Valve U = Ignitor Relay V = Gas Valve Relay W = Fan Relay X = Circulation Pump Relay

Y = Selector TCS2 Z = Link for Continuous Pump Run

A01 = Air Pressure Switch A02 = Fan A03 = Gas Valve A05 = Motorised Valve A06 = Circulation Pump A07 = Flame Detector A08 = Earth Terminal

Colours

Gry = Grey Rd = Red Bl = Blue Grn/Yll = Yellow/Green Wh = White Brn = Brown Blk = Black Wh/Rd = White/Red

SE003A

Heating

D.H.W.

Heating + D.H.W.

Flue Test operating modes

SHORT SPARE PAR

TS LIST

GENUS 27 BFFI PLUS

ES001A

70 69

6 7

8 9

11 12 13

14 15 16

103

93 94

109

108

107 106

105

104

102

6463656667

115

117

116

115

114

113

110

111

112

111

100

6263

118

119

120

123

112

101

596061

305307

130

131

132

304

133

134

306

129

135

304

301302302301 303

54 53

52 51

50 49 48 47

46 45 44 43

42 41

121

122

113

124

125

126

127

128

304

Code 998799

361

363

Code 998099

371

375

ER2000210020001001

372

373

374

362

21 22 31

2415

272625

Code 573127

313

312

311

MODELS CHARACTERISTICS SERIAL NO:

GENUS 27 BFFI PLUS METHANE 2320010200001 A GENUS 27 BFFI PLUS LPG 2320010200001 B

- 2 -

322823

33 34 35

REF.

VALIDITY

GENUS 27 BFFI PLUS

573435 573520 572625 572626 997089 574233 574279 997147 998799 573727 571547 998099 569292 573015 569538 953082 952610 952935 573343 998484 573441 569560 569561 564254 570248 570251 999434 998627 573139 573140 998458 997206 999403 998806 573127 573456 571649 570439 569281 569282

Key

no.

G.C. part

no.

ARISTON

Part No.

Description

379816

Main exchanger Gasket 3/4" Main burner (natural gas) Main burner (LPG) Gas valve (SIT 845 SIGMA) Spark generator Gasket Motor 3-way valve Hydraulic group Manual vent cock Diaphragm (main flow switch) Main circuit flow switch Safety valve (3bar) Temperature probe (D.H.W.) Time clock (digital) PCB low voltage Cable PCB PCB (E A-FFI/P) Gasket (fan inlet) Pressure switch Electrode (Detection) Electrode (Ignition R.H.) Electrode (Ignition L.H.) Auto ari vent Burner jet (NG 1.25) Burner jet (LPG 0.72) Oversize circulator Low pressure switch Expension relief valve 6 bar Temperature/pressure relief valve 7 bar Temperature probe Thermostat (overheat) Expension vessel (D.H.W.) Fan D.H.W. cylinder 60l Expension vessel (C.H.) Pressure gauge Anode (cylinder) Burner jet 1.25 mm full kit (NG) Burner jet 0.72 full kit (LPG)

1 1

1 1 1

1 1 1 1 1 1 1 1 1 1 1 1 1

1 1

1 1 1

1 1 1 1 1 1 1 1 1 1 1 1

5 6 7 7 11 12 13 16 18 19 20 21 24 30 41 44 45 47 57 62 77 78 79 84 85 85 89 93 97 101 104 105 108 121 127 132 133 313 381 382

TB003A

23 99 84 1518 111

Manufacturer: Merloni TermoSanitari SpA - Italy Commercial subsidiary: MTS (GB) LIMITED

MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT

Telephone: (01494) 755600 Fax:(01494) 459775 Internet: http://www.mtsgb.ltd.uk E-mail: info@mtsgb.ltd.uk

Technical Service Hot Line: (01494) 539579

403

Users

Manual

403

TABLE OF CONTENTS

1) GENERAL INFORMATION page 3

2) OPERATING INSTRUCTIONS pag e 4

3) TIME CLOCK page 7

4) USEFUL INFORMATION AND TROUBLESHOOTING page 10

IMPORTANT

Please read this manual carefully.

For additional information, please consult the “Installation and Servicing Instructions.”

Please ensure manuals provided are kept with the appliance so that they can be used by the end-

user, installer or our authorised engineer.

Dear Customer,

Thank you for choosing an ARISTON boiler. We guarantee that your boiler is a reliable and technically sound product. This User’s Manual provides detailed instructions and recommendations for proper installation, use and maintenance. Remember to keep this manual in a safe place for future reference i.e.by the gas meter. Your local MTS Servicing Centre is at your complete disposal for all requirements.

MTS (GB) Limited

Every attempt has been made to avoid errors of

any kind

in this User’s Manual, the Management

invites customers to inform

of any inaccuracies which they may find.

This will help to improve our service

The guarantee on this appliance is valid

for 12 months from the first day of

installation.

Repairs to the electric, hydraulic or gas circuits may be carried out only by your local authorised MTS Servicing Centre.

403

CONTROL PANEL

Legend

A) Ignition Lockout Reset Button/Safety (Overheat)Thermostat Reset B) Ignition Lockout L.E.D. C) Selector Knob for Summer/Winter/Flue Analysis Modes D) Low System Water Level L.E.D. E) Temperature Adjustment Knob for Domestic Hot Water F) Heating System Thermometer G) Safety (Overheat)Thermostat Intervention L.E.D. H) Adjustment Knob for Heating Temperature I) On/Off L.E.D. L) On/Off Switch O) Heating System Pressure Gauge

MTS (GB) Limited support the initiative.Your installer will give you, and show you how to use , a logbook which will give you important information about your boiler, and heating system. Please have this logbook to hand whenever you contact a service engineer or us.

All CORGI Registered Installers carry a CORGI ID card, and have a registration number. Both should be recorded in your boiler Logbook. You can check your installer is CORGI registered by calling CORGI direct on :- (01256) 372300.

This is a combined appliance for the production of central heating (C.H.) and domestic 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 or negligent use. Do not allow children or inexperienced persons to use the appliance without supervision. If you smell gas in the room, do not turn on light switches, use the telephone or any other object which might cause sparks. Open doors and windows immediately to ventilate the room. Shut the gas mains tap (on the gas meter) or the valve of the gas cylinder and call your Gas Supplier immediately. If you are going away for a long period of time, remember to shut the mains gas tap or the gas cylinder valve.

Before any intervention within the boiler it is first necessary to cut off the electrical power supply by turning the external switch to “OFF”. This manual may be kept in the front panel of the boiler.

1. GENERAL INFORMATION

FR004A

403

CAUTION

Installation, start-up, adjustments and maintenance must be performed by a competent person only, in accordance with the current Gas Safety (Installation & Use) Regulations and the instructions provided. Improper installation may cause damage or injury to individuals, animals and personal property,for which the manufacturer will not be held liable. To ensure efficient and safe operation it is recommended that the boiler is serviced annually by a competent person. If it is known or suspected that a fault exists on the appliance, it must not be used until the fault has been corrected by a competent person.

HELPFUL SUGGESTIONS

To get the most out of your boiler, we have provided you with some useful advice on the proper use and maintenance:

- Periodically check the system pressure using the pressure guage “O”, make sure that the pressure at 1.5 bar (the blue part on the gauge) when the system is off and cool. The warning L.E.D. “D” will indicate if the pressure is below the minimum recommended value. Consult your installer for checking and refilling the system.

- The outer panels of the unit's case must only be cleaned with a damp cloth. Do not use abrasive cleaners.The Control panel can be wiped with either a damp or dry cloth. Spray polishes must not be used on the control panel surface or knobs.Care must be taken in preventing any liquid entering the appliance.

- If the water is exceptionally hard, install a water softener so that the efficiency of the unit remains the same over time, as this will consume less gas.

- To improve comfort and take full advantage of the heat produced by the boiler, it is recommended that an external thermostat be installed.

- If the boiler is not going to be used for an extended period of time, turn off the supply of electricity to the unit by pressing the On/Off switch

“L”.

- The green L.E.D.“I” will turn off .Then turn off the supply of gas to the unit itself.

- It is good practice to clean and service the appliance and central heating system every year.

- Call an Authorised Service Centre.

2. OPERATING INSTRUCTIONS

START-UP PROCEDURE LIGHTING

Before starting the unit, check the following:

· The water pressure on the pressure gauge “O”;

· That the gas cock and the inlet for domestic water are open.

These models are equipped with electronic ignition which utilises contact ionisation. To make the boiler operational, simply press the On/Off switch “L”. The green L.E.D.“I” will then turn on. At this point the boiler is ready for use: a centralised electronic control unit will automatically light the main burner when needed. If the burner

UT001A

UT008Aa

403

°C

40 50 607080

does not light within the pre-set safety time limit, the red “B” L.E.D.will light up. To reset the ignition system, the reset button “A” must be pressed. Should the system fail to light a second time, check to make sure that the gas cock is open. If the problem persists, contact one of our Authorised Service Centres for assistance.

WINTER AND SUMMER OPERATING MODES

The boiler is fitted with a selector knob “C” which allows you to switch between winter <>and summer <>and also heating only <

> operating modes and vice versa.When the knob is set to <

>, the boiler can serve the dual purpose of providing heat and/or hot

water for domestic use. The supply of hot water for domestic use always takes precedence over heating. When the knob is set to <>,the boiler cuts out the heating system and only provides hot water for domestic use (when needed).

TURNING ON THE CENTRAL HEATING

Installation without a room thermostat :

- Turn on the power supply to the boiler by pressing the On/Off switch “L”;the green L.E.D.“I” will then turn on;

- Turn the “C” selector knob to <> or < > (in this position no domestic hot water is produced);

- Regulate the temperature of the water in the boiler by turning the “H” knob.The temperature can vary between 42°C and about 82°C;

- Check the boiler temperature on the thermometer with the yellow L.E.D.s “F”. With this type of installation, the ambient temperature does not influence the operation of the boiler and the circulation pump always remains in operation.

UT008Ab

UT008Ac

UT008Ad UT008Ae

UT008Aa

403

Installation with a room thermostat:

- Turn the “C” selector knob to < >;

- Turn on the power supply to the boiler by pressing the On/Off switch

”L”; the green L.E.D. will then turn on;

- Turn the thermostat knob “H” to the highest temperature setting.

- With this type of installation, the boiler is controlled by a room

thermostat

. Therefore, it runs until the ambient temperature has reached the

temperature setting on the thermostat. At that point, the main burner will turn off and the circulation pump will stop.

TURNING OFF THE CENTRAL HEATING

Installation without a room thermostat:

To turn off the heating, turn the “C” selector knob to < >.The boiler will still provide hot water for domestic use.

ADJUSTING THE HEA TING TEMPERA TURE

To economise on consumption while achieving the highest level of comfort, the temperature adjustment knob is designed with three different heating zones based on the temperature outside the home. Rotate the knob “H” as shown below.

PRODUCTION OF HOT WATER

FOR DOMESTIC USE

- Turn on the power to the boiler by pressing the On/Off switch “L”;

- Turn the “C” selector knob to <> or < > (in this position no central heating is produced);

- Turn the “E” knob to select the temperature for the hot water

(between 40°C and about 70°C).

ADJUSTING THE TEMPERA TURE OF

WATER FOR DOMESTIC USE

It is recommended that the temperature for the hot water should not be set to high temperatures and then mixed with cold water. Setting the thermostat to medium temperatures is preferable

(see figure)

•

From +5°C to +15°C

Lower than -5°C

From +5°C to -5°C

UT008Af

UT008Ag

•

UT008Ai

•

UT008Al

UT008Ah

403

Operating the time switch

The step marked with the symbol “”are necessary to carry out a switching program.

Preparing for Operation

Activate the “Res” switch (=RESET) to reset the time switch to its default setting (activate using a pencil or similar pointed instrument).Do this:

- every time you wish to “reset”the time switch

- to erase all switching times and the current time of day. After approximately two seconds the following display appears:

Enter current time and weekday

- Keep the “”key pressed down During the summer time period press the +/- 1h key once. Enter the hour using the “h” key Enter the minutes using the “m” key Enter the day using the “Day” key

1 = “Monday”..............7 = Sunday

- Release the “”key.

3.TIME CLOCK

SHUTDOWN PROCEDURE

To turn off the main burner, simply press the On/Off switch “L”; the green L.E.D.“I” will also turn off. As a precautionary measure, it is recommended that the gas cock located on the bottom of the boiler be turned off as well.

UT008Aa

UT008Am

Input

Manual switch

Summer and winter time setting

Enter the hours

Weekdays

flash Enter

minutes

Enter

switching

times

Imput

time

Reset

Day

Enter

weekday/s

403

Automatic Manual Continuous

Entering the switching times

You have 20 memory Iocations availab le .Each switching time tak es up one memory location. Keep pressing the “Prog”key until a free memory location is shown in the display “– –:– –”.

Programme ON or OFF with the “”key: “”= OFF; “”= ON

Enter the hour using “h” Enter the minutes using “m” If a switching command is to be carried out every day (1 2 3 4 5 6 7)

then store using the “”key, otherwise select the day(s) it is to be carried out by using the “Day”key.

When the day seIection is left bIank, the programmed switching instruction operates at the same time every day 1 2 3 4 5 6 = Monday – Saturday 1 2 3 4 5 = Monday – Friday 6 7 =Saturday – Sunday

Selection of single days: 1 = Mon. .............. 2 =Tues.

Save the switching time with the “”key. The time switch enters the automatic operating mode and displays the current time of day. Begin any further entry of a switching time with the “Prog” switch. If your entry is incomplete, the segments not yet selected will blink in the display.After programming is completed, and you return the time clock

to the current time display with the “”key, the time clock will not activate any switching instruction required for the current time .Y ou ma y

need to manually select the desired switching state with the “” key.Thereafter, as the unit encounters further switching instructions in the memory in real time, it will correctly activate all subsequent switching instructions.

Manual Override Switch “”

With the “”you can change the current setting at any time. The switching program already entered is not altered.

UT008An

Operation Operation Operation

= ON = ON = Continuously ON

= OFF = OFF = Continuously OFF

The switching If the current You can only times corres- switching mode is return to automatic pond to the changed manually, mode from the program the next switching continuously-ON entered. time will be and continuously-

carried out auto- OFF switching matically again modes by according to the pressing the " " entered switching key. program.

Reading the programmed switching times

Pressing the “Prog” key displays the programmed switching times until the first free memory location appears in the display “– – : – –”.

If you now press the “Prog” key once again, the number of free memory Iocations will be displayed, e.g. “FR

1188

”. If all memory locations are

occupied, the display “FR

0000

” appears.

Changing the programmed switching times

Press the “Prog”key repeatedly until the switching time you want to change is displayed. You can now enter the new data. See point “Entering the

switching times”.

Notes on storing switching times:

If you end your entry of the switching times by pressing the “Prog” key, then the switching time you have entered will be stored and the next memory location displayed. Entry of fur ther switching times is also carried out as described in point 4.3.

In addition, a complete switching command is stored automatically after around 90 seconds provided no other key is pressed.The time switch then enters the automatic operating mode and displays the current time again.

Deleting individual switching times

Press the “Prog” key repeatedly until the switching time you wish to delete is shown in the display.Then set to “– –” using the “h” or “m” key and keep

the “”k e y pressed down for around 3 seconds.The switching time is now erased and the current time is displayed.

AM / PM time display

If you press the “+/-1h” and “h” keys at the same time, the time display switches into the AM/PM mode (mostly used in English-speaking countries).

Technical data

Connection see unit imprint Switching capacity see unit imprint Ambient temperature -10°C to +55°C Running reserve 5 h at + 20°C Memory Iocations 20 Shortest switching time 1 min. Programmable every minute

403

4. USEFUL INFORMATION AND TROUBLESHOO TING

BOILER SHUTDOWN

The boiler unit is equipped with safety devices which intervene in certain situations to shutdown the boiler. Some of these situations are signalled by the unit and can be corrected by the user.

SHUTDOWN DUE TO THE FAILURE OF THE BURNER TO LIGHT AUTOMATICALLY

This anomaly is indicated by the red “B” L.E.D. To reset the unit, press and then release the “A” button. At this point, the electronic ignition system will attempt to light the burner again. If lighting failure occurs repeatedly, it is recommended that you contact one of our Authorised Service Centres.

SHUTDOWN DUE TO OVERHEATING

This anomaly is signalled by the red “G” L.E.D. The boiler shuts off because the safety thermostat detected that the boiler temperature has reached the temperature limit. To reset the unit, wait until the boiler has cooled and then press the “A” button. If the safety thermostat shuts off the unit on a frequent basis, contact one of our Authorised Service Centres for assistance.

SHUTDOWN DUE TO INSUFFICIENT

WATER CIRCULATION

This anomaly is indicated by the red “D” L.E.D. One of the possible causes of this shutdown situation could be the lack of water in the boiler or water circulation failure in the primary heating circuit. Check the system pressure on the pressure gauge “O”and, if it is less than 0.5 bar, consult your installer f or chec king and refilling the system.

Then reset the unit by turning the boiler off and then back on with the On/Off button “L”. If this situation persists, contact one of our Authorised Service Centres.

UT008Aa

UT001A

UT008Ap

UT008Ab

UT008Ao

403

FLUE TEST FEA TURE

(only for authorised personnel)

The “C”

Summer/Winter/Flue T est

selector knob can be set to <> to bypass temperature adjustment on the heating circuit for the purpose of analysing the fumes produced by combustion. To access this mode, open a water tap or taps so that the flow rate is no less than 8 litres per minute. Then press the “C” selector knob in and tur n it from <> or <> to the <>.

WARNING!

The flue test feature eliminates the slow-light feature.

This mode must only be selected by a qualified service engineer.

UT008Aq

Manufacturer: Merloni TermoSanitari SpA - Italy Commercial subsidiary: MTS (GB) LIMITED

MTS Building Hughenden Avenue High Wycombe Bucks HP13 5FT

Telephone: (01494) 755600 Fax:(01494) 459775 Internet: http://www.mtsgb.ltd.uk E-mail: info@mtsgb.ltd.uk

Technical Service Hot Line: (01494) 539579

Cod. 2399841517000

ariston Genus 27 BFFI Plus User guide

Specifications and Main Features

Frequently Asked Questions

User Manual