Ariston MICROCOMBI 23 MFFI Manuel utilisateur

Supplied By www.heating spares.co Tel. 0161 620 6677

MICROCOMBI

WALL-HUNG ELECTRONIC IGNITION GAS COMBINATION BOILER

• 23 kW - 80,000 Btu/h or

27 kW - 92,000 Btu/h versions

• Built-in mechanical clock

• Fully modulating

• Fast “twin pass” heat exchanger

• Built-in by-pass

• Anti-frost device

• Anti-scale protection

• High efficiency

• Connection kit

COMPACT DIMENSIONS (300x400x700 mm)

Supplied By www.heating spares.co Tel. 0161 620 6677

MICROCOMBI 23 MFFI Ø 3/4” BSP Ø 1/2” BSP Ø 3/4” BSP Ø 1/2” BSP Ø 3/4” BSP G1 60/100 - G2 80-80

Central heating flow B

Domestic hot water outlet D

Domestic hot water inlet E

Central heating return G

Flue (Ø mm)

Gas inlet

The microCombi offers advantages to both the end-user and the

installer. The size and weight is clearly an asset of this

combination boiler.

Ariston have applied a lot of time and effort into the resear ch

and development of the standard features of the boiler. These

features include: electronic ignition, temperature control of both

the heating system and domestic hot water to an accuracy of ±

1oC, a "twin pass" heat exchanger (generating both domestic

hot water and central heating directly) and adjustable

independent hot water temperature regulation.

The microCombi is able to regulate the maximum heating output

via the printed circuit board. The boiler also features a soft

ignition function, therefore reducing the noise output when the

boiler star ts to work. In order to avoid potential problems, the

boiler features electronically controlled overheating protection, a

warning light for defective flue dischar ge, an anti-scale device

and anti-frost device.

CLEARANCE DIMENSIONS - PIPE FITTINGS - EXHAUST OUTLETS

WALL-HUNG GAS COMBINATION BOILER

ROOM-SEALED COMBUSTION CHAMBER

MICROCOMBI

Electronic

ignition

Automatic

by-pass

Anti-scale

device

C.H. Temp

adjustment

P.CB with

microprocessor

IP X4DAnti-frost

device

123

0bar

Insufficient system

pressure shutdown

Fully modulating

100

105

300

142

156

ABDE

Twin pipe exhaustCoaxial exhaust

700

65 67 67 65

400

142

A B CDE

100

105

300

156

ABDE

700

65 67 67 65

205

400

130

A B CDE

D.H.W. Temp

adjustment

23 MFFI

27 MFFI

MICROCOMBI 27 MFFI Ø 3/4” BSP Ø 1/2” BSP Ø 3/4” BSP Ø 1/2” BSP Ø 3/4” BSP G1 60/100 - G2 80-80

Supplied By www.heating spares.co Tel. 0161 620 6677

SCHEMATIC

ABD E

ROOM-SEALED FAN FLUE

23 MFFI - 27 MFFI

TECHNICAL DATA

Category II 2H 3+ II 2H 3+

Type

C12, C32, C42, C52 C12, C32, C42, C52

POWER

Heat input max. kW - Btu/h 25.6 - 87,300 27.3 - 93,100

Heat input min. kW - Btu/h 11.0 - 37,500 11.0 - 37,500

Heat output max. kW - Btu/h 23.7-80,900 27.0 -92,100

Heat output min. kW - Btu/h 9.6-32,800 9.3-31,700

EFFICIENCY

SEDBUK Rating Band D D

CHARACTERISTICS

Heat loss to the casing (

∆

T= 50°C) % 1 1.3

Heat loss through the flue when burner on % 6.5 6.7

Heat loss through the flue when burner off % 0.4 0.4

Exhaust discharge maximum (natural gas) kg/h 51 58

Residual discharge head mbar 0.96 1.41

Consumption at nominal capacity G20

(1)

/h 2.72 3.10

Gas consumption after 10 minutes* m

0.32 0.36

(15°C, 1013 mbar) G30-G31

(1)

kg/h 2.02-2.00 2.31-2.27

Exhaust gas temperature at nominal capacity

°C 126 149

CO2content % 7.0 7.0

O2content % 8.0 8.0

CO content ppm 38 53

Minimum ambient temperature °C +5 +5

Pressure loss through boiler (max) (

∆

T=20°C) mbar 200 200

Residual head of system bar 0.25 0.25

D.H.W. minimum flow rate l/min 2.5 2.5

Domestic hot water pressure maximum bar 6 6

Domestic hot water pressure minimum bar 0.2 0.2

Built-in expansion vessel capacity l 6 6

Built-in expansion vessel pre-charged pressure bar 1 1

Maximum water content of system l 130 130

Maximum heating pressure bar 3 3

Gas inlet pressure - Natural Gas (G20) mbar 20 20

Gas inlet pressure - LPG (G30-G31) mbar 30-37 28-37

Weight kg 39 41

G.C. number 47-116-16 47-116-24

PERFORMANCES

Central heating temperature maximum °C 82 82

Central heating temperature minimum °C 42 42

Domestic hot water temperature maximum °C 54 56

Domestic hot water temperature minimum °C 36 36

D.H.W. flow rate

∆T= 35°C l/min 9.7 11.0

D.H.W. flow rate

∆T =35°C gal/min 2.1 2.5

ELECTRICAL DATA

Electrical supply V/Hz 230/50 230/50

Power consumption W 135 155

Protection grade of electrical system IP X4D X4D

Internal fuse rating FAST 2 AT FAST 2 AT

C*: C12, C32, C42, C52, C82;

(1)

:15°C, 1013 mbar

*Calculated at 70% maximum output

Flue

connector

Air

intake

Fan

Combustion

chamber

hood

“Twin-pass”

heat exchanger

Domestic hot water

temperature

probe

Combustion

chamber

Burner

Detection

electrode

Ignition

electrodes

Gas valve

Control

panel Spark

generator Water entry

filter

Combustion

analysis points

Air pressure

switch

Venturi

Expansion

vessel

3 bar safety valve

Circulation pump

with automatic air

release valve

Graph of boiler residual head

flow rate l/h

100 200 300 400 500 600 700 800 900 1000 1100 1200 1300

100

200

300

400

500

separation of the intake

simplified coaxial

system coupling air pressure switch

can be accessed

directly from the

exterior

Central heating

temperature

probe

MICROCOMBI

23 MFFI

MICROCOMBI

27 MFFI

MICROCOMBI 27 MFFI

Supplied By www.heating spares.co Tel. 0161 620 6677

ARISTON

QUALITY PRODUCTS

EXCEPTIONAL SERVICE

REGIONAL

TRAINING

CENTRES

• Plymouth

• High Wycombe

• Gt. Manchester

COMPREHENSIVE

TRAINING

Programmes across the entire

Ariston product range covering all

theoretical and practical aspects.

Designed for commercial heating

installers, merchants and

independent gas-heating ser vice

organisations: courses are offered

at 3 fully equipped training centres

in the UK. In addition permanent

training facilities are available at a

number of technical colleges

nationwide.

TECHNICAL HOT LINE

Immediate and effective

technical assistance is only

a phone call away.

Assistance is also available

for any information or advice

on the product most suitable

for your needs and the

requirements of your system

installation.

PROFESSIONAL

SERVICE

Ariston ser vice technicians are

swift and prepared for any

eventuality. They offer you and

your customers a high level of

assistance, comprising the

best technical, logistic and

human resources available.

Ariston invests a great deal in

this field to guarantee a

decisive advantage that

others cannot offer.

MTS (GB) Limited

MTS Building

Hughenden Avenue

High Wycombe

Bucks, HP13 5FT

Tel: 01494 755600

Fax: 01494 459775

Technical Ser vice Hot Line 01494 539579

Technical Ser vice Fax Line 01494 463066

E-mail: [email protected] oup.com

www.ariston.co.uk

E-mail: [email protected] oup.com

In the interests of our customers, MTS (GB) Limited is continually developing these products to improve both

performance and design. We therefore reser ve the right to change specification without prior notice. This brochure is accurate at the date of printing. Consumer statutor y rights are not affected.

0063

July 2003 Printed by Vario Press

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