Ariston MICROCOMBI 23 MFFI User manual

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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)

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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
A
Central heating flow B Domestic hot water outlet D Domestic hot water inlet E Central heating return G Flue (Ø mm)
C
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
4
0bar
Insufficient system
pressure shutdown
Fully modulating
100
105
300
142
156
G1
C
ABDE
Twin pipe exhaustCoaxial exhaust
700
65 67 67 65
17
G1
400
142
1
A B CDE
100
105
300
G2
156
G2
83
C
ABDE
700
65 67 67 65
17
205
400
99
99
99
130
G2
G2
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

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SCHEMATIC
C
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)
m
3
/h 2.72 3.10
Gas consumption after 10 minutes* m
3
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

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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: [phone]
Fax: [phone]
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