Ariston Combi A 24 MFFi, Combi A 30 MFFi Installation and Servicing Instructions

COMBI A

SERIES

12

9

3

6

Combi A 24 MFFi

Combi A 30 MFFi

Installation and

Servicing

Instructions

Type C Boilers

G.C.N: 47-116-44 (24 kW) G.C.N: 47-116-45 (30 kW)

LEAVE THESE INSTRUCTIONS WITH THE END-USER

		OR	E	GU	L
	M
R					A	T	I
E
H							O		N
T
				MODE
				MAN
				A
		TEMP
										E
									L
								B
							I
						T
					A
		C O MP

Country of destination GB

IE

These instructions are suitable for the Combi A boilers :

Do not forget the Log Book!

MTS supports Benchmark, the heating industry code to ensure the correct installation, commissioning and servicing of domestic central heating systems.

To The Householder

Make sure you have a completed Log Book for your boiler. This provides a record of the commissioning of your boiler.

It contains important information about your particular installation that may be required by service engineers. The Log Book will also provide contact details for the installer should you need guidance in the use of this appliance or if there are any problems.

As with your car, your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service check. The service history of the appliance will be recorded on the Log Book.

In the unlikely event of any problems with your boiler or system you should first contact your installer. If your installer cannot resolve the problem he should telephone our national service helpline.

A charge may be made if MTS Service is called out to resolve a non-product related fault.

Your statutory rights are not affected.

To The Installer

As part of the commissioning of this appliance it is vital that the Log Book is completed and given to the Householder. Please ensure that your customer is aware of the importance of keeping the Log Book safe as a record of the installation and the appliance service history.

Please ensure that your customer is aware of the correct operation of the system, boiler and controls.

MTS recommend the use of protective clothing, when installing and working on the appliance i.e. gloves.

CUSTOMER CARE

MTS, as a leading manufacturer of domestic and commercial water heating appliances is committed to providing high quality products and a high quality after sales service.

Advice on installation or servicing can also be obtained by contacting the MTS Technical and Customer Service Departments at High Wycombe.

TECHNICAL DEPARTMENT		CUSTOMER SERVICE DEPARTMENT
Tel:	0870 241 8180	Tel:	0870 600 9888
Fax:	01494 459775	Fax:	01494 459775

GUARANTEE

The manufacturer’s guarantee is for 2 years from the date of purchase. The guarantee is invalidated if the appliance is not installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler without delay.

CAUTION

In the United Kingdom, 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.

In the Republic of Ireland, the installation and initial start up of the appliance must be carried out by a Competent Person in accordance with the current edition of I.S.813 “Domestic Gas Installations”, the current Buidling Regulations, reference should also be made to the current ETCI rules for electrical installation.

All CORGI registered installers carry a CORGI ID card, and have a registration number. Both should be recorded in your boiler Log Book. You can check your installer is CORGI registered by calling CORGI direct on:- [phone].

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 that a fault exists on the appliance, it must not be used until the fault has been corrected by a competent person.

This instruction booklet is especially designed for appliances installed in the UK and the Republic of Ireland

2

Contents

CUSTOMER CARE

		Page
Guarantee ............................................................................................................................................................		2
Statutory Requirements .......................................................................................................................................		2
Contents ...............................................................................................................................................................		3
INTRODUCTION ..................................................................................................................................................		4
USER INSTRUCTIONS ........................................................................................................................................		5
1	CONTROL PANEL...........................................................................................................................................	5
2	HOW TO USE ..................................................................................................................................................	6
3	MAINTENANCE ...............................................................................................................................................	7
4	GUARANTEE...................................................................................................................................................	7
5	PRACTICAL INFORMATION...........................................................................................................................	7
6	SETTING THE TIME CLOCK ..........................................................................................................................	8
6.1 SETTING THE MECHANICAL CLOCK ..................................................................................................		8
6.2 SETTING THE DIGITAL CLOCK.............................................................................................................		9
INSTALLERS’ INSTRUCTIONS.........................................................................................................................		11
7	DESCRIPTION...............................................................................................................................................	11
8	DIMENSIONS ................................................................................................................................................	12
9	HYDRAULIC DATA .......................................................................................................................................	12
10	INSTALLATION REQUIREMENTS................................................................................................................	13
11	INSTALLING THE BOILER............................................................................................................................	16
12	CONNECTING THE FLUE.............................................................................................................................	18

12.1	FITTING THE COAXIAL FLUE (ø 60 / 100 Horizontal) .........................................................................	19
12.2	FITTING THE 5” FLUE (ø 80 / 125 Horizontal / Vertical).......................................................................	19
12.3	FITTING VERTICAL FLUE (ø 60 / 100) .................................................................................................	21
12.4	FITTING THE TWIN FLUE (ø 80 / 80) ...................................................................................................	22
13 ELECTRICAL CONNECTIONS .....................................................................................................................		25
13.1	FITTING DIGITAL TIME CLOCK ...........................................................................................................	27
14 COMMISSIONING AND TESTING ................................................................................................................		28
14.1	INITIAL PREPARATION ........................................................................................................................	28
14.2	INITIAL START-UP................................................................................................................................	28
14.3	ADJUSTING THE CO2 ..........................................................................................................................	29
14.4	GAS CONVERSION ..............................................................................................................................	29
14.5	ADJUSTING THE MAXIMUM HEATING POWER ................................................................................	29
14.6	FITTING THE EXTERNAL SENSOR.....................................................................................................	29
14.7	EXTERNAL SENSOR SET-UP..............................................................................................................	30
14.8	COMPLETION .......................................................................................................................................	30
14.9	OPERATIONAL CHECKS .....................................................................................................................	30
14.10	INSTRUCTING THE END USER...........................................................................................................	31
15 FITTING THE CASING ..................................................................................................................................		32
16 SEQUENCE OF OPERATION.......................................................................................................................		33
16.1	CENTRAL HEATING MODE .................................................................................................................	33
16.2	DOMESTIC HOT WATER MODE..........................................................................................................	34
17 ADJUSTMENTS AND SETTINGS .................................................................................................................		35

3

SERVICING INSTRUCTIONS
18 REPLACEMENT OF PARTS .........................................................................................................................		42
18.1	To Gain General Access........................................................................................................................	42
18.1.1	Removing the front panel.......................................................................................................................	42
18.1.2	Lowering the control panel.....................................................................................................................	42
18.2	Access to the Combustion Chamber .....................................................................................................	43
18.2.1	Removing the combustion chamber front panel ....................................................................................	43
18.2.2	Removing the burner .............................................................................................................................	44
18.2.3	Removing the detection electrode .........................................................................................................	44
18.2.4	Removing the ignition electrode.............................................................................................................	44
18.2.5	Removing the fan...................................................................................................................................	45
18.2.6	Removing the gas valve.........................................................................................................................	45
18.2.7	Removing the heat exchanger ...............................................................................................................	46
18.2.8	Removing the spark generator...............................................................................................................	46
18.3	ACCESS TO THE WATER CIRCUIT ....................................................................................................	47
18.3.1	Drain down.............................................................................................................................................	47
18.3.2	Removing the 3 way valve.....................................................................................................................	47
18.3.3	Removing the float of the flow switch ....................................................................................................	47
18.3.4	Removing the secondary heat exchanger .............................................................................................	48
18.3.5	Removing the pump...............................................................................................................................	48
18.3.6	Removing the pressure relief valve ......................................................................................................	49
18.3.7	Removing the domestic expansion vessel.............................................................................................	49
18.3.8	Removing the overheat thermostat........................................................................................................	49
18.3.9	Removing the temperature sensors (NTC’s) .........................................................................................	49
18.3.10	Removing the pressure gauge...............................................................................................................	50
18.3.11	Removing the DHW flow switch.............................................................................................................	50
18.3.12	Removing & cleaning the condensate trap ............................................................................................	50
18.4	ACCESS TO THE CONTROL SYSTEM ...............................................................................................	50
18.4.1	Removing the PCB’s..............................................................................................................................	50
18.4.2	Removing the fuses ...............................................................................................................................	51
18.5	CONNECTING THE EXTERNAL SENSOR ..........................................................................................	51
19 INCORRECT FUNCTION ..............................................................................................................................		52
20 MAINTENANCE INSTRUCTIONS .................................................................................................................		53
20.1	GENERAL REMARKS...........................................................................................................................	53
20.2	CLEANING THE PRIMARY EXCHANGER ...........................................................................................	53
20.3	OPERATIONAL TEST ...........................................................................................................................	53
21 SHORT SPARES LIST ..................................................................................................................................		54
22 TECHNICAL DATA ........................................................................................................................................		55
23 BENCHMARK COMMISSIONING CHECKLIST ............................................................................................		57
24 SERVICE INTERVAL RECORD ....................................................................................................................		58
25 NOTES...........................................................................................................................................................		59

INTRODUCTION

The COMBI A is a fully automatic, wall mounted, low water content condensing combination boiler. It is a room sealed, fan assisted, balanced flued appliance providing central heating and mains pressure domestic hot water on demand. It has electronic ignition and is suitable for all modern electrical control systems. The boiler is designed for sealed systems only and a circulating pump, expansion vessel together with a pressure gauge and safety valve are included within the boiler.

The COMBI A range of boilers are domestic gas boilers and intended for domestic use only.

4

USER INSTRUCTIONS

1. Control panel

30

27

26

28

29

31

16

Fig. 1

32

33

34

35

Control panel (Fig. 1)

16.- Pressure gauge

26.- Display

27.- On/off push button and power on indicator light

28.- Programming button - domestic hot water temperature holding function -yellow indicator light

29.- Reset push button and red indicator lock-out light

30.- DHW control knob and temperature setting

31.- Central Heating control knob and temperature setting 32.- Menu button

33.- Reducing button

34.- Increasing button

35.- Setting button

Connecting bracket

Taps shown in Open position (Fig. 2)

39 : Gas service tap

40 : Water service tap

41 : Central heating flow isolating valve

42 : Central heating return isolating valve

43 & 44: Filling taps

45 : Filling loop

41

42

43

			44
Fig. 2	45	39	40

5

NOTE:

2. How to use

Switching on and filling instructions

1.Check the pressure in the central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16 (fig.1), should it be neccessary to re-pressurise the system,ensure the filling loop 45 (fig. 2) is attached, open the filling taps 43 & 44, the pressure gauge will now start to rise, once the pressure reads 1.0 bar, close the filling taps and disconnect the filling loop.

2.Check that the gas service tap is opened at the gas meter and the main power is on. Green indicator 27 Power ON

3.Open the gas tap 39 (fig.2).

4.The boiler is now ready to use.

If the boiler is left off for a long time, some air in the gas pipe can hinder the first lighting attempts. (please refer to Section 19 Incorrect Function, page 47)

+

+

OPEN CLOSED

Setting the time and programming the domestic hot water exchanger temperature holding function

The time is set using the buttons located under the display panel.
Pressing the setting button			once for more than 5 seconds causes the hour value to flash. This
can be adjusted using the		or	buttons. Pressing the setting button					again validates the
hour value and causes the minutes value to flash. This can now be adjusted by pressing the									or
buttons then validated using the setting button					. The time is now set and the programming
start time for the hot water exchanger temperature holding function now flashes on the display.
There are 2 possibilities:
- either you wish to modify the setting. In this case, press the						or	buttons to modify the hour then press the setting
button	to validate the hour, causing the minutes value to flash. This can then be adjusted using the									or	buttons,
then validated using the setting button				. The programming start time for the hot water exchanger temperature holding

function is set. Follow the same procedure to set the programming end time for the hot water exchanger temperature holding

function.
- or you wish to retain the original setting (6 a.m. - 11 p.m.). In this case, validate by pressing the setting button	twice once
the time is set in order to end programming and exit the menu.

N.B. The temperature holding programming function is only activated if the button is pressed (indicator lit)

NOTE: THIS IS NOT A TIMER FOR CH CONTROL

DHW mode
Turn the control knob 30 between min and max. During the adjustment,	flashes.

The flashing goes on for a while after the adjustment, then the display indicates the time.

When DHW is drawn, the display indicates the following:

Heating mode
Turn the control knob 31 between min and max. During the adjustment			flashes.
The flashing goes on for a while after the adjustment, the display will then indicate:
- the central heating flow temperature if the room thermostat is calling for heat.
- the time if the room thermostat is OFF.
			Room thermostat request symbol
BURNER ON and output level			Flame digit
The flame digits will increase or decrease depending on the output.			Burner ON
"Programming" button:		button not activated, the domestic hot water exchanger temperature holding function is
activated permanently.
"Yellow"	button activated, the temperature holding function respects the programme (11 p.m. OFF, 6 a.m. ON, original

setting). The display indicates the following

6

Stand-by mode

Turn the control knobs 30 and 31 to the OFF position to deactivate the DHW and Heating. Leave the ON/OFF button On with the green light on.

During the stand-by mode the display indicates the time, anti-seizing and antifreezing will be active.

Switch OFF

Press the button ON/OFF.

During this mode the boiler will not operate, but is still connected to the mains.

Anti-freezing mode

Turn the control knobs 30 and 31 to OFF to switch off the heating and hot water functions. Leave the On/Off button on with the green light on.

When the anti-freeze comes on, the corresponding code is displayed with the snowflake pictogram .

The two possible codes are 05 (anti-freeze - pump only) or 06 (anti-freeze - burner).

05: When this mode is active, the circulating pump operates for one minute and the diverter valve switches every 23 hours.

Caution: in this mode, the room thermostat anti-freeze function is inoperative.

Boiler anti-freeze function:	the pump starts at 8°C
	the burner starts at 3°C

3. Maintenance

Your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service check. The service history of the appliance will be marked in the Sercice Interval Record (Section 25, page 61).

4. Guarantee

The manufacturer`s guarantee is for 12 months from the date of purchase. The guarantee is voidable if the appliance is not installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler without delay.

5. Practical information

Cleaning the casing and control panel

Should it be necessary to clean the casing and control panel. do so only with a soft damp cloth, do not use any spray polishes or cleaners.

Precaution to avoid freezing

We recommend you contact your installer or local service centre for further advice on the actions to be taken to avoid the system freezing.

• DHW system

Turn off the main cold water supply and drain the boiler :

-Open a hot water tap

-Unscrew the cold water inlet tail

• CH system

Chose one of the following solutions :

-1) Drain completely the Central Heating system

-2) Protect the Central Heating system with anti freeze chemical products and verify the concentration periodically

-3) Leave the Heating mode switched on and set the room thermostat to anti-freeze mode (between 5 and 10°C)

-4) Leave your boiler in stand by mode, the anti-freeze device will switch on the pump and the burner if necessary.

7

6.Setting the time clock

6.1Setting the mechanical clock

12

9

3

6

Fig. 3

A
	2	1	24	23
	3
	4	12		22
5					21
6				I		20	C
7	9					19
						1
8						8
9		6			7	1	B
	10			61
	11			1
			1	5
	21
		13	4

Fig. 4

1. General layout

The mechanical clock covers a 24 hour period. Each tappet represents 15 minutes A (Fig. 4). An override switch is located on the clock B (Fig 4).

2. To set the time

To set the time of day, grasp the outer edge of the dial and turn slowly clockwise until the correct time is lined up with the arrow C (Fig. 4).

3. To Set the "On" and "Off" times

The clock uses a 24hours system. e.g. 8 = 8.00 am and 18 = 6.00 pm "ON" periods are set by sliding all tappets between the "ON" time and the "OFF" time to the outer edge of the dial.The tappets remaining at the centre of the dial are the "OFF" periods.

4. For operation

Put the selector switch B to the symbol to control the central heating by the clock. Put the switch B to « I» to select permanent operation or to « 0» to turn the central heating off permanently.

8

6.Setting the time clock (continued)

6.2Setting the Digital Clock

Reset

Enter
switching
times	.
	g
	o
	r
	P
Imput
time

Manual switch

h

m

Day

Enter weekday/s

Summer and winter time setting

Enter the hours

Weekdays flash

Enter minutes

Automatic	Manual		Continuous
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.

Operating the time switch

The steps 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 “ ” button pressed down

During the summer time period press the +/- 1h button once. Enter the hour using the “h” button

Enter the minutes using the “m” button Enter the day using the “Day” button 1 = “Monday”..............7 = Sunday

- Release the “ ” button.

9

6. Setting the time clock (continued)

Entering the switching times

You have 20 memory Iocations available. Each switching time takes up one memory location. Keep pressing the “Prog” button until a free memory location is shown in the display “– –:– –”. Programme ON or OFF with the “ ” button :

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

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 “ ” button.

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 “

” button, the time clock will not activate any switching instruction required for the current time. You may need to manually

select the desired switching state with the “			” button. 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.

Reading the programmed switching times

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

If you now press the “Prog” button once again, the number of free memory Iocations will be displayed, e.g.18“”. If all memory locations are occupied, the display “00” appears.

Changing the programmed switching times

Press the “Prog” button 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” button, then the switching time you have entered will be stored and the next memory location displayed.

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

Deleting individual switching times

Press the “Prog” button repeatedly until the switching time you wish to delete is shown in the display. Then set to “– –” using the “h” or “m” button and keep the“ ” button 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” button at the same time, the time display switches into the AM/PM mode.

10

INSTALLER INSTRUCTIONS

7. Description

		1	1.- Steel chassis complete with expansion vessel
			2.- Sealed chamber
			3.- Burner and heat exchanger assembly
			4.- Air / gas connection
	24	25	5.- 24 V modulating fan
			6.- Gas valve
	10		7.- Ignition electrode
			8.- Ionisation probe
			9.- Ignitor
	2	9	10.- Combustion products manifold
			11.- Siphon
		7	12.- Silencer
	3		13.- Electrical box
			14.- Pump
	8		15.- Secondary heat exchanger
			16.- Pressure gauge
	20
		4	17.- Three way valve
			18.- Automatic air vent
	22
			19 - Domestic hot water flowswitch
	21	5	20.- Main exchanger inlet thermistor
	12		21.- Main exchanger outlet thermistor
	6		22.- Overheat sensor
		42	23.- Central heating pressure relief valve
			24.- Manual air vent with pipe
			25.- Thermo fuse

		17
13		15
	14	18

16	9	3	23
		12
		6	19
Fig. 5			11

					Fig.	6
30	27	26	28	29	31

26.- Display

27.- On/off push button and power on indicator light

28.- Programming button - domestic hot water temperature holding function - yellow indicator light

29.- Reset push button and red indicator locking light

30.- DHW control knob	and temperature
setting

31.- Central Heating control knob and temperature setting

32.- Menu button

33.- Reducing button

34.- Increasing button

35.- Setting button

Fig. 7			33			35
	32				34

11

8. Dimensions

			All dimensions in mm		I	Safety valve C/H and condensate
					J	Heating flow
			289		K	D.H.W. outlet
					L	Gas supply
16241			21		M	Cold water inlet
					N	Heating return
	691,5					With packaging :
720						24 kW : 37 kg
						30 kW : 40 kg
			172,5
				I
			121,5	J K L M N
			4,7
		I
				32		minimum space required 450
						450 mini pour entretien
296 (24296kW)
360 (30/35 kW)
	54 54 54 54					440390
	J	K	L M N
Fig. 8

9. Hydraulic data

Pump Head Graph (15/50 & 15/60)

	0.45
	0.4
(bar)	0.35
	0.3
												30 kW
Pressure	0.25
	0.2
	0.15
	0.1
												24 kW
	0.05
	0
	0	200		400		600		800		1000		1200		1400

flow rate (l/hr)

Fig. 9

Pf		Pr ssion à froid pour le circu chauffage (en bar)
		Central heating initial pressure when cold (in bar)
2,0
1,9
1,8
																						40ϒC
1,7
1,6
1,5																50	ϒC
1,4
1,3												60ϒC
1,2									70ϒC
1,1				80ϒC
1,0
								80			100			120
20		40				60											140			160			180			200		220		240		260		280

System capacity chart	C litre
Capa ité m ximale de l'installation (en litres)

The boiler is fitted with an automatic by-pass as standard.

The graph (Fig. 9) shows the development of the pressure available in relation to flow (on exit from the boiler T 20°C).

To ensure correct operation, the minimum flow of the appliance must be 300 l/h. (Thermostatic taps closed).

Capacity of the installation.

The water heater is fitted with a pressurised expansion vessel.

Volumes :

6 litres

Pressure: 0,7 bar.

The volume of the expansion vessel in a pressurised appliance varies according to:

-the average operating temperature in °C

-the static height, which is the difference in metres between the highest point of the appliance and the expansion vessel axis).

The minimum cold filling pressure of the appliance is 1 bar (recommended pressure between 1.2 and 1.7 bar).

The pressure of the expansion vessel should always be greater than the static height (in metres) divided by 10.

Fig. 10

12

10. Installation requirements

Reference Standards

In the United Kingdom, the installation and initial start up of the boiler must be by a CORGI Registered installer in accordance with the installation standards curently in effect, as well as with any and all local health and safety standards i.e. CORGI.

In the Republic of Ireland the installation and initial start up of the appliance must be carried out by a Competent Person in accordance with the current edition of I.S.813 “Domestic Gas Installations” and the current Building Regulations, reference should also be made the the current ETCI rules for electrical installation.

The installation of this appliance must be in accordance with the relevant requirements of the Local Building Regulations, the current I.E.E. Wiring Regulations, the by-laws of the local water authority, in Scotland, in accordance with the Building Standards (Scotland) Regulation and Health and Safety document No. 635, “Elelectricity at Work Regulations 1989” and in the Republic of Ireland with the current edition of I.S. 813 and the Local Building Regulations (IE).

C.O.S.H.H.

Materials used in the manufacture of this appliance are non-hazardous and no special precautions are required when servicing.

Codes of Practice

Installation should also comply with the following British Standards Codes of Practice:

BS 7593:1992	Treatment of water in domestic hot
	water central heating systems
BS 5546:1990	Installation of hot water supplies for
	domestic purposes
BS 5440-1:2000	Flues
BS 5440-2:2000	Air Supply
BS 5449:1990	Forced ciculation hot water systems
BS 6798:2000	Installation of gas fired hot water
	boilers of rated input not exceeding
	70kW
BS 6891:1989	Installation of low pressure gas pipe up
	to 28mm
BS 7671:2001	IEE Wiring Regulations
BS 4814:1990	Specification for expansion vessels
BS 5482:1994	Installation of L.P.G.

and in the Republic of Ireland in accordance with the following codes of practice

I.S. 813

Domestic Gas Installations

Avoid installing the boiler where the air inlet can be polluted by chemical products such as chlorine (swimming pool area), or ammonia (hair-dresser), or alkalin products (launderette)

Flue

Detailed information on flue assembly can be found in Section 12 “Connecting the flue”.

The boiler must be installed so that the flue terminal is exposed to the free passage of external air at all times and

must not be installed in a place likely to cause nuisance. It must not be allowed to discharge into another room or space such as an outhouse or closed lean-to.

Condensing boilers have a tendency to form a plume of water vapour from the flue terminal due to the low temperature of the flue gasses. The terminal should therefore be located with due regard for the damage or discolouration that might occur to buildings in the vicinity and consideration must also be given to adjacent boundaries, openable windows should also be taken into consideration when siting the flue.

The minimum acceptable clearances are shown below:

Fig. 11

E

E

- A Directly below an opening, window, etc	300 mm
- B Below gutters, soils pipes or drain pipes	75 mm
- C Below eaves	200 mm
- D From vertical drain pipe or soil pipe	75 mm
- E From internal or external corner	300 mm
- F Above ground on a public walkways or patio	2100 mm
- G From a surface facing the terminal	2500 mm
- H From a terminal facing the terminal	2500 mm
- I Vertically from a terminal on the same wall	1500 mm
- J Horizontally from a terminal on the same wall	300 mm
- K Horizontally from an opening window	300 mm
- L Fixed by vertical flue terminal

NOTE: THE FLUE MUST NOT BE INSTALLED IN A PLACE LIKELY TO CAUSE A NUISANCE.

It may be necessary to protect the terminal with a guard, if this is the case it will be necessary to purchase a stainless steel terminal guard. Reference should be made to the Building Regulations for guidance.

Ventilation

The room in which the boiler is installed does not require specific ventilation. If it is installed in a cupboard or compartment permanent ventilation is not required for cooling purposes.

Gas Supply

The gas installation and soundness testing must be in accordance with the requirements of BS 6891. Ensure that the pipe size is adequate for demand including other gas appliances on the same supply.

13

10. Installation requirements (continued)

Electrical Supply

The appliance requires an earthed 230V - 50 Hz supply and must be in accordance with current I.E.E. It must also be possible to be able to completely isolate the appliance electrically. Connection should be via a 3 amp fused doublepole isolating switch with contact separation of at least 3 mm on both poles. Alternatively, a fused 3 Amp. 3 pin plug and unswitched socket may be used, provided it is not used in a room containing a bath or shower. It should only supply the appliance.

The boiler is suitable for sealed systems only. The maximum working pressure for the appliance is 6 bar. All fittings and pipework connected to the appliance should be of the same standard. If there is a possibility of the incoming mains pressure exceeding 6 bar, particularly at night, then a suitable pressure limiting valve must be fitted.

The boiler is designed to provide hot water on demand to multiple outlets within the property. If there is a requirement for greater demands, for example if the property has several bathrooms and cloakrooms, a vented or unvented hot water storage system may be used.

Showers

Any shower valves used with the appliance should be of a thermostatic or pressure balanced type. Refer to the shower manufacturer for performance guidance and suitability.

Flushing and Water Treatment

The boiler is equipped with a stainless steel heat exchanger.

The detailed recommendations for water treatment are given in BS 7593:1992 (Treatment of water in domestic hot water central heating systems); the following notes are given for general guidance;

If the boiler is installed on an existing system, any unsuitable additives must be removed;

Under no circumstances should the boiler be fired before the system has been thoroughly flushed; the flushing procedure must be in line with BS7593:1992.

We highly recommend the use of a flushing detergent appropriate for the metals used in the circuit. These include cleansers produced by Fernox and BetzDearborn, whose function is to dissolve any foreign matter that may be in the system;

In hard water areas or where large quantities of water are in the system the treatment of the water to prevent premature scaling of the main heat exchanger is necessary.

The formation of scale strongly compromises the efficiency of the thermic exchange because small areas of scale cause a high increase of the temperature of the metallic walls and therefore add to the thermal stress of the heat exchanger.

Demineralised water is more aggressive so in this situation it is necessary to treat the water with an appropriate corrosion inhibitor.

Any treatment of water by additives in the system for frost protection or for corrosion inhibition has to be absolutely suitable for all the metals used in the circuit.

14

The use of a corrosion inhibitor in the system such as Fernox MB-1, BetzDeaborn Sentinel X100 or Fernox System Inhibitor is recommended to prevent corrosion (sludge) damaging the boiler and system;

If anti-freeze substances are to be used in the system, check carefully that they are compatible with the metals used in the circuit.

MTS suggests the use of suitable anti-freeze products such as Fernox ALPHI 11, which will prevent rust and incrustation taking place.

Periodically check the pH of the water/anti-freeze mixture of the boiler circuit and replace it when the amount measured is out of the range stipulated by the manufacturer ( 7 < pH < 8). DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE

In under-floor systems, the use of plastic pipes without protection against penetration of oxygen through the walls can cause corrosion of the systems metal parts (metal piping, boiler, etc), through the formation of oxides and bacterial agents.

To prevent this problem, it is necessary to use pipes with an “oxygen-proof barrier”, in accordance with standards DIN 4726/4729. If pipes of this kind are not used, keep the system separate by installing heat exchangers of those with a specific system water treatment.

IMPORTANT

Failure to carry out the water treatment procedure will invalidate the appliance warranty.

System Controls

The boiler is electrically controlled and is suitable for most modern electronic time and temperature controls. The addition of such external controls can be beneficial to the efficient operation of the system. The boiler connections for external controls are 12V DC and so only controls of 12V DC that have voltage free contacts should be used. (Section 13 Electrical Connections - page 25).

Location

The boiler can be installed on any suitable internal wall. Provision must be made to allow the correct routing of the flue and siting of the terminal to allow the safe and efficient removal of the flue products. A compartment or cupboard may be used provided that it has been purpose-built or modified for the purpose. It is not necessary to provide permanent ventilation for cooling purposes. Detailed recommendations are given in BS 5440 pt 2. If it is proposed that it is installed in a timber framed building then reference should be made to British Gas Document DM2, or advice sought from CORGI.

Where a room sealed appliance is installed in a room containing a bath or shower, the appliance and any electrical switch or appliance control, utilising mains electricity should be situated specifically in accordance with current IEE Wiring Regulations.

For unusual locations, special procedures may be necessary. BS 6798:2000 gives detailed guidance on this aspect.

Condensate Discharge

The condensate discharge hose from the boiler must have a continuous fall of 2.5o and must be inserted by at least 50mm

10. Installation requirements (continued)

into a suitable acid resistant pipe - e.g. plastic waste or overflow pipe. The condensate discharge pipe must have a minimum diameter of 22mm, must have a continuous fall and preferably be installed and terminated to prevent freezing.

The discharge pipe must be terminated in a suitable position:

i)Connecting into an internal soil stack (at least 450mm above the invert of the stack). A trap giving a water seal of at least 75mm must be incorporated into the pipe run, there also must be an air break upstream of the trap.

ii)Connecting into the waste system of the building such as a washing machine or sink trap. The connection must be upstream of the washing machine/sink. If the connection is down stream of the waste trap then an additional trap

1.Internal termination of condensate drainage pipe to internal stack

3.External termination of condensate drainage pipe via

internal discharge branch (e.g. sink waste - proprietary fitting).

giving a minimum water seal of 75mm and an air break must be incorporated in the pipe run, as above.

iii)Terminating into a gully, below the grid level but above the water level.

iv)Into a soakaway.

NOTE: If any condensate pipework is to be installed externally then it should be kept to a minimum and be insulated with a waterproof insulation and have a continuous fall. The total length of external pipe used should not exceed 3 metres.

Some examples of the type of condensate terminations can be found below.

2.External termination of condensate drainage pipe via internal discharge branch (e.g. sink waste) and condensate siphon

4.External termination of condensate drainage pipe via condensate siphon

15

11. Installing the boiler

Please check that you are familiar with the installation requirements before commencing work (Section 10).

The installation accessories described in the following list are included in the boiler packaging:

-Hanging bracket

-A paper template (showing the dimensions of the boiler with 5 mm side clearances)

-Connection tails and valves

-Screws and washers

-Connection washers

-Installation, Servicing and Operating Instructions

Method of positioning the boiler on the wall.

The paper template can be used to ensure the correct positioning of kitchen cabinets etc. It also details the commissioning instructions.

The paper template has to be fixed to the wall and used to locate the position of the hanging bracket and the centre for the flue hole.

Drill and plug the wall and secure the hanging bracket using the screws provided. Remove the boiler from its packaging as shown in Fig. 17 and unscrew the two clamp locking bolts A and remove the casing (Fig. 13).

Place the boiler on the wall on the hanging bracket (Fig. 14).

NOTE: THE APPLIANCE MUST NOT BE FITTED ON A COMBUSTIBLE WALL SURFACE.

Connecting the boiler to the system

-Remove the boiler casing as described in Section 18.

-Push in the tabs “P” (Fig. 14) on either side of the boiler and pivot the electrical box forward to gain access to the valve connections

-Remove the caps and connect the boiler to the taps using washers provided in the plastic bag. 4 x fibre washers for the C/H flow and return, hot water outlet and cold water inlet connections 1 x rubber washer for gas connection

Safety valve discharge

The pressure relief valve tube is made of copper. It should terminate below the boiler safely outside the premises. Care should be taken that it does not terminate over an entrance or window or where a discharge of heated water could endanger occupants or passers by.

Fill the Central Heating and DHW system and bleed air from system as described in Section 14.

The system should be carefully checked for leaks, as frequent refilling could cause premature system corrosion or unnecessary scaling of the heat exchanger. The pipe from the siphon (11 Fig. 5) should be connected to a drain as described in the relevant Brittish regulations.

Pay special attention to not bend the condensate silicone drain pipe such as the flow will be interrupted. Please use exclusively drain pipe material compatible with condensate products. (refer to BS 6798 : 2000)

The condensate flow can reach 2 litres / hour; because of the acidity of the condensate products (Ph close to 2), take care before operation.

Fitting the Horizontal Flue

Attention ! Before starting the boiler, the siphon (11 Fig. 5) must be filled with water. Before fitting the flue l onto the boiler, pour 1/4 litre of water in the exhaust pipe as shown in Fig. 16.

Instructions on fitting the flue can be found in Section 12.

IMPORTANT!!

Use only the specific condensation flue kit supplied by MTS.

16

11. Installing the boiler (continued)

A

A

Fig. 12

1

2

12

9

3

6

Fig. 13

P

P

Fig. 14

Fig. 15

17

12. Connecting the Flue

The boiler should only be installed with a flue system supplied by MTS (GB) Limited.

These kits are supplied separately to the appliance in order to respond to different installation solutions. For more information with regard to the inlet/outlet accessories consult the accessory catalogue. The boiler is supplied ready for connection to a concentric flue system.

NOTE: SEE PAGE 24 FOR MAXIMUM AND MINIMUM FLUE RUNS (TABLES A, B AND C)

IMPORTANT!!

BEFORE CONNECTING THE FLUE, ENSURE THAT 1/4 LITRE OF

WATER HAS BEEN POURED INTO THE EXHAUST CONNECTION

TO FILL THE CONDENSATE TRAP (FIG. 16). SHOULD THE

TRAP BE EMPTY THERE IS A TEMPORARY RISK OF FLUE

GASSES ESCAPING INTO THE ROOM.

Fig. 16

Warning

The exhaust gas ducts must not be in contact with or close to inflammable material and must not pass through building structures or walls made of inflammable material.

When replacing an old appliance, the flue system must be changed.

Ø 60/100 mm

5

Important

Ensure that the flue is not blocked. Ensure that the flue is supported and assembled in accordance with these instructions.

c162

Fig. 17

Installation without extension

118

150 mm

Fig. 18

Installation with extension

* penteslope

150 mm

*slopepente5 mm5 mmper metrepar mètre

18