Ariston EURO COMBI 47-116-10, EURO COMBI 47-116-12, EURO COMBI A-27 MFFI, EURO COMBI A-23 MFFI User Manual

A/23 MFFI - A/27 MFFI

G.C.N. 47-116-10 / 47-116-12

Installation Instructions Type C Boilers

LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER

Country of destination: GB

TABLE OF CONTENTS

1.GENERAL INFORMATION

1.1General Instructions

1.2Technical Information

1.3Overall View

2.INSTALLATION

2.1Reference Standards

2.2Siting the Appliance

2.3Overall Dimensions

2.4Clearances

2.5Mounting the Appliance

2.6Electrical Connection

2.7Gas Connection

2.8Water Connections

2.9Flue Connection

2.10Room Thermostat Connection

2.11Electrical/System Diagrams

2.12Water Circuit Diagrams

3.COMMISSIONING

3.1Initial Preparation

3.2Removing the Front Panel

3.3Control Panel

3.4Initial Start-up

3.5Operational Adjustments

3.6Combustion Analysis

3.7Fume Discharge Monitoring

3.8Boiler Safety Systems

3.9Draining the System

4.GAS ADJUSTMENTS

Gas Adjustment Table

4.1 Changing the Type of Gas

5.MAINTENANCE

6.MISCELLANEOUS

6.1Wiring Diagram for Two Heating Zones

6.2Wiring Diagram for Connection to Ariston Unvented Cylinderl

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1.GENERAL INFORMATION

1.1General Instructions

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.

User’s

Manual

A/23 MFFI

A/27 MFFI

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 by 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 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.

Always disconnect the appliance either by unplugging it from the mains or turning off the mains switch before cleaning the appliance or carrying 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

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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 necessary.

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 with the instructions shown in the installation instructions.

12- Check the efficiency of the hot water supply (flow and temperature).

13- Check general operation of the appliance.

14- Check the exhaust system for the combustion products.

1.2Technical Information

				A/23 MFFI	A/27 MFFI
CE Certification
Heat Input		max/min	kW	25.6/11.0	29.8/12.0
Heat Output		max/min	kW	23.1/9.2	27.3/10.1
Efficiency of Nominal Heat Input		%		90.2	91.6
Efficiency at 30% of Nominal Heat Input		%		87.8	88.3
Heat Loss to the Casing (³T=50°C)		%		1.2	1.3
Flue Heat Loss with Burner Operating		%		8.6	7.1
Flue Heat Loss with Burner Off		%		0.4	0.4
Maximum Discharge of Fumes (G20-G25)		Kg/h		59	62
Residual Discharge Head		mbar		1.15	1.4
Consumption at Nominal Capacity (G20-G25) m3/h				2.72/3.32	3.16/3.86
Gas Consumption after 10 Minutes*		m3		0.32/0.39	0.37/0.45
(15°C, 1013 mbar) (G30-G31)		Kg/h		2.02/2.00	2.35/2.32
Temp. of exhaust fumes at nominal
capacity (G20-G25)		°C		137	128
CO2 Content		%		5.8	6.6
O2 Content		%		9.2	8.0
CO Content		ppm		32	34
Minimum Ambient Temperature		°C		+5	+5
Head Loss on Water Side (max) (³T=20°C)		mbar		200	200
Residual Head of System		bar		0.25	0.25
Heating Temperature		max/min °C		82/42	82/42
Domestic Hot Water Temperature		max/min °C		56/36	56/36
D.H.W. Flow Rate ³T=35°C		l/min		9.5	11.2
D.H.W. Flow Rate ³T=35°C		gal/min		2.1	2.5
D.H.W. Minimum Flow Rate		l/min		2.6	2.6
Pressure of Domestic Hot Water		max/min bar		6/0.2	6/0.2
Expansion Vessel Capacity		l		7	7
Expansion Vessel Pre-load Pressure		bar		1	1
Maximum Water Content in System		l		145	145
Maximum Heating Pressure		bar		3	3
Nominal Pressure Natural Gas (G20-G25)		mbar		20-25	20-25
LPG	(G30-G31)	mbar		30-37	30-37
Electrical Supply		V/Hz		230 / 50	230 / 50
Power Consumption		W		150	190
Protection Grade of Electrical System		IP		44	44
Internal Fuse Rating				FAST 2 AT	FAST 2 AT
Weight		Kg.		47	47
G.C. Number				47-116-10	47-116-12

*Calculated at 70% maximum output

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1.3Overall View

A/23 MFFI - A/27 MFFI

Fig. 1.1

Legend:
1.	Flue Connector	14.	Drain Valve
2.	Combustion Chamber Hood	15.	Secondary Heat Exchanger
3.	Main Heat Exchanger	16.	Safety Valve (3 bar)
4.	Combustion Chamber Insulation Panel	17.	Circulation Pump with Automatic Air Release Valve
5.	Burner	18.	Gas Valve
6.	Expansion Vessel	19.	Detection Electrodes
7.	Overheat Thermostat	20.	Ignition Electrodes
8.	Spark Generator	21.	Fan
9.	Diverter Valve	22.	Venturi
10.	Main Circuit Temperature Probe	23.	Air Pressure Switch

11.Main Circuit Flow Switch

12.Diverter Valve Microswitch

13.Filter Seat

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

2.1	Reference Standards	The installation and initial start up 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 .
		This appliance must be installed by a competent installer in
		accordance with the 1984 Gas Safety (installation & use)
		Regulations (as amended)
		The installation of this appliance must be in accordance with the relevant
		requirements of the 1984 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:
			Low pressure
			pipes	BS 6891	1988
			Boilers of rated input
			not exceeding 60 kW	BS 6798	1987
			Forced circulation hot
			water system	BS 5449	1990
			Installation of gas hot water
			supplies for domestic purposes
			( 2nd family gases)	BS 5546	1990
			Flues	BS 5440-1	1990
			Air supply	BS 5440-2	1989

2.2Siting the Appliance

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.

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2.3Overall Dimensions

465

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”)

2.4Clearances

890

	(A-B-D-E)
	(C)
365	Fig. 2.1

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

A/23 MFFI - A/27 MFFI

400

60				60
450
40	50	60	70	80
	C			C
				300

Fig. 2.2

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2.5	Mounting the Appliance	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.
2.6	Electrical Connection	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 (1.2), 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 electrical connections are situated on the reverse of the control panel (see the servicing manual for further information)

Fig. 2.3

Important!

2.7Gas Connection

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 EuroCombi range of boilers are 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 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 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.

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.

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2.9Water Connections

A/23 MFFI - A/27 MFFI

				C
A		B			D			E

I

Fig. 2.4

Legend

A = Central Heating Flow

B = Domestic Hot Water Outlet

C = Gas Inlet

D = Domestic Cold Water Inlet

E = Central Heating Return

I = Safety Valve

Central Heating

Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990, the following 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 natural 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 and manufactured in accordance with BS 2870:1980.

Safety Valve 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

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