Mikrofill Ethos 24cc Installation Instructions Manual
Mikrofill Ethos
Condensing combination boiler
Installation Instructions
24cc
CE Mark
British Gas Service Listing
G.C.No: 47-157-01
No: 0201055
2
Mikrofill gas appliances comply with the requirements contained in CE Mark documents
contained with European directives applicable to them. In particular, these appliances comply
with the CE directives and technical specifications contained within them :
? Gas Appliances directive 90/396
? Efficiencies directive 92/42
? Low tension directive 73/23 (modified from 93/68)
? Electromagnetic Compatibility directive 89/396 (modified from 93/68)
IMPORTANT !
The manual
must be read thoroughly, so that you
will be able to use the boiler in a safe way. And it
must be kept for referance in the future.
Installation and first lighting must
be carried out by
a competent person.
Repairs
must be carried out only by a competent
person, using genuine spare parts. Do no more than
switching off the boiler yourself.
The boiler
allows heating up of water to a
temperature less than the boiling point.
The boiler
can be used only for those purposes for
which it has been specially designed.
The boiler
must not be touched by children or by an
unfamiliar person to its operation.
The manufacturer
disclaim all liability for any
translations of the present ma
nual from which
incorrect interpretation may occur.
The manufacturer
accepts no responsibility for
unsatisfactory performance of the appliance and flue
due to failure to comply the instructions.
The appliance is build to comply with the regulation
now in force regarding gas appliance's safety and the
European regulation now in force relative to safety of
household and similar electrical appliances.
The manufacturer, in the continuous process to
improve his products, reserves the right to modify the
data expressed in the present documentation at any
time and without prior notice.
The present documentation is an informative support
and it cannot be considered as a contract towards third
parties.
This appliance complies with the EN 483 and EN 625
Standards.
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CONTENTS - COMMISSIONING
1. GENERAL DESCRIPTION ….…………………………………………………………. 4
1.1. DESCRIPTIONS AND OPERATION PRINCIPLES OF COMPONENTS / PARTS
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS …………………………… 5
2.1. Dimensions (Diagram 1)……………………………………………………………... 5
2.2. Boiler Schematic……………………………………………………………………... 6
2.3. Boiler Connection Dimensions………………………………………………………. 7
2.4. Technical Data……………………………………………………………………….. 7
2.5. Boiler Flow Diagrams................................................................................................... 8
2.6. Hydroblock Diagrams………………………………………………………………... 9
2.7. Pump Characteristics………………………………………………………………… 10
2.8. Heating System Design………………………………………………………………. 11
2.9. Domestic Hot Water System Design………………………………………………… 11
3. INSTALLATION ………… ………………………………………………………...……. 12
3.1. Piping System Installation…………………………………………………………… 12
3.2. Boiler Location………………………………………………………………………. 13
3.3. Boiler Installation……………………………………………………………………. 14
3.4. Flue Installation……………………………………………………………………… 14
3.5. Electrical Connection………………………………………………………………… 16
4. COMMISSIONING…….………. ……………………………………………………….. 17
4.1. Filling………………………………………………………………………………… 17
4.2. Gas connection……………………………………………………………………….. 17
4.3. Lighting the boiler…………………………………………………………………….20
4.4. On board adjustments: potentiometers and trimmers………………………………... 20
4.5. On board adjustments: jumpers……………………………………………………… 20
4.6. Setting the maximum heating temperature…………………………………………... 21
4.7. Setting the heating output……………………………………………………………. 21
4.8. Safety Devices……………………………………………………………………….. 22
5. SETTINGS ………………………………………………………………………………. 23
4
1. GENERAL DESCRIPTION
The fan flued hermetic type combination boiler is an apppliance that fires Natural gas in its
combustion chamber for either heating a place or obtaining domestic hot w
ater. It combines two
different functions at same appliance. For this two different function it has two independent
circuit. One of them is heating circuit and the other is domestic hot water circuit. It is sealed from
the heating place. So well ventilatio
n conditions is not a necessity in place where the appliance
mounted .
1.1. DESCRIPTIONS AND OPERATION PRINCIPLES OF COMPONENTS / PARTS
Burner : Gas that comes from gas valve fires in burner and produces heat.
Ignition electrodes : sparks occurs between the two electrodes for igniting the burner.
Gas valve : it opens or closes the gas channel and regulates the burner pressure.
Ignition module : it works with gas valve together and ignite the burner by means of producing
high voltage. It starts the fan and
evaluates signals coming from air pressure switch and flame
sense electrode.
Injectors : They guide gas to the burner.
Fan : it gets the fresh air for combustion and blow the combustion products out of hermetic
chamber.
Gas manifold : the injectors are mounted on gas manifold.
Combustion chamber : The heat isolated combustion chamber guides the burner flame to the heat
exchanger.
Primary Heat exchanger : It transfers the heat energy in flame to the water.
Automatic air vent : it purges the air in heating circuit automatically.
Air pressure switch : It checks the pressure difference between the hermetic chamber and the
outer space and sends signal to the ignition module about the fan operation.
Overheat safety thermostat : It sends signal to the control card
about the water temperature which
exceeds 110 ºC. It interrupts the boiler if the water temperature exceed 110 ºC. It has a manual
reset button at rear side.
Hydraulic block : It has several connections for components, pipes and inlets, outlets to the boil
er.
(For example water pressure sensor, safety valve, expansion vessel etc.) It has an automatic by-
pass valve inside. It consists of two independent parts which are connected together by means of
pipes.
Three way valve : it is one part of the hydraulic bl
ock. It guides the hot water to heating circuit or
domestic hot water exchanger.
Domestic hot water heat exchanger : It transfers the heat energy in hot water of heating circuit to
the domestic water. It is integrated with primary heat exchanger.
Fan hood : it collects combustion products and guides to the fan.
Flue connection kit : It connects the outer space and combustion chamber for getting fresh air and
blow the combustion products out of boiler.
Hermetic chamber : The combustion chamber, burner, heat
exchanger, fan and fan hood is placed
inside the hermetic chamber.
Safety valve : It prevents the heating circuit against the water pressure increment excessively.
(The water pressure can not exceed 3 bar.)
Control card : The control card evaluates the si
gnals which come from sensors and thermostats.
And it makes modulation for control the gas valve. It controls all systems of boiler. It is central
control unit of the boiler.
Water flow sensor : it senses the domestic hot water demands and sends signal to the control card.
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2.1. DIMENSIONS
The Combination boiler is delivered in two separate
packages;
- the boiler itself
- the flue system
Weight: 42 kg
Diagram 1
2. TECHNICAL AND DIMENSIONAL CHARACTERISTICS
1.1.1. Instructions and Regulations
Assembly, Installation, First ignition and maintenance must be carried out by a competent person, i
n
accordance with all-current technical regulations and directives.
1.1.2. C.O.S.H.H.
Materials used in the manufacture of this appliance are non-
hazardous and no special precautions are
required when servicing or maintenance is undertaken.
1.1.3. Related Documents
This appliance must be installed strictly in accordance with these instructions.
? The Gas Safety Regulations (Installations & Use) 1996
? The Building Regulations
? The Local Building Regulations
? The Buildings Standards (Scotland - consolidated) Regulations
? Model Water Bye laws
? British Standards code of practice:
B.S. 7593 1992 Treatment of water in domestic hot water central heating systems
B.S. 5546 1990 Installation of hot water supplies for domestic purposes
B.S. 5540 Part 1 2000 Flues
B.S. 5540 Part 2 1989 Air supply
B.S. 5449 1990 Forced circulation hot water systems
B.S. 6798 1987 Installation of gas fired hot water boilers
B.S. 7671 1992 IEE wiring regulations
B.S. 4814 1990 Specification for expansion vessels
B.S. 5482 1994 Installation of L.P.G
For Northern lreland the current rules in force apply
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2.2. BOILER SCHEMATIC
1 - Domestic thermistor
2 – Hydroblock
3 - Gas valve
4 - Gas valve ignition module
5 - Fan hood
6 - Burner
7 - Ignition electrodes
8 - Combustion chamber
9 - Integrated heat exchanger
10 - Air pressure switch
11 - Heating safety valve (3 bar)
12 – PCB (in protective case)
13 - Domestic water flow switch
14 – Bypass valve (in hydroblock)
15 - Pump
16 - Expansion vessel (at rear)
17 - Heating thermistor
18 - Overheat safety thermostat
19 - Flame sense electrode
20 - Fan
21 - Loss of water sensor
22 – Automatic air vent (top of exp.
vessel)
A - Heating outlet (3/4” male)
B - Domestic hot water outlet (1/2”
male)
C - Gas (3/4” male)
D - Cold water inlet (1/2” male)
E - Heating return (3/4” male)
Diagram 2
21
19
18
17
20
10
5
15
8
9
6
7
13
11
4
3
12
2
1
A B C D E
7
Net calorific value at 15 C and 1013.25 mbar
G20 34.04 MJ/m3
1 mbar approximately equals 10 mm H2O
2.4. TECHNICAL DATA
Heating
Hot water
Heating output adjustable from ... (kW) 8.9 Hot water output
to ... (kW) 23.3 automatically variable from ... (kW) 8.9
from ... (Btu/h) 30368 to ... (kW) 23.3
to ... (Btu/h) 79502 from... (Btu/h) 30368
Efficiency (%) 91 to ... (Btu/h) 79502
Maximum heating temperature (oC) 90 Maximum hot water temperature (oC) 90
Expansion vessel effective capacity (l) 8 Specific flow rate (for 30oC temp rise)
Expansion vessel charge pressure (bar) 0.5 (l/min.) 11.0
Maximum system capacity at 75oC (l) 150 Threshold flow rate (l/min.) 2.3
Safety valve, max. Service pressure (bar) 3 Water flow rate (for 35oC temp rise) (l/min.) 9
Products outlet diameter (mm) 60 Maximum supply pressure (bar) 8
Fresh air inlet diameter (mm) 100 Minimum operating pressure (bar) 0.3
Natural Gas (G20)
? Burner injector (mm)
1,2
Inlet pressure
(mbar)
20
Electrical supply (V) 230 Burner pressure
(mbar)
13
Maximum absorbed power (W) 170 Gas rate maximum (m3/h) 2.88
Level of protection IP44 Gas rate minimum (m3/h) 1.06
2.3. BOILER CONNECTION DIMENSIONS
Diagram 3
Diagram 4
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