End User
Manual
microGENUS II 24 MFFI
microGENUS II 28 MFFI
microGENUS II 31 MFFI
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Country of destination: GB/IE
CONTROL PANEL
I
J
K
E
C
I
LEGEND:
A - On/Off Switch
B - Domestic Hot Water Temperature Adjustment
C - Central Heating Temperature Adjustment
D - Reset Button
E - Comfort Mode Selector
F - Hot Water (Summer Mode LED - Green)
G - Ignition/Overheat Lockout LED (Red)
H - Central Heating (Winter Mode) LED (Green)
I - Digital Display (Fault Code/Water Temperature)
J - Time Clock
K-Central Heating System Pressure Gauge
2. OPERATING INSTRUCTIONS
CAUTION
In the United Kingdom installation, start-up, adjustments and maintenance must be
performed by a CORGI Registered Installer in accordance with the installation
standards currently in effect, as well as with any and all local health and safety
standards i.e.. CORGI.
K
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 Building Regulations, reference
should also be made to the current ETCI rules for electrical installation.
HELPFUL SUGGESTIONS
To get the most out of your boiler, we have provided you with some useful advice on
proper use and maintenance:
- Periodically check the system pressure using the pressure gauge “D”, make sure that
the pressure is at 1.5 bar when the system is off and cool. If the pressure is below the
minimum recommended value (1 bar). To refill the system, open the two black handles
connected to the silver flexible hose, once the pressure gauge “K” reads 1.5 bar close
the valves again.
NOTE: DO NOT UNDER ANY CIRCUMSTANCES USE THE APPLIANCE WITH THE PRESSURE GAUGE
READING ZERO.
- The outer panels of the unit's case must only be cleaned with a damp cloth. Do not use
abrasive cleaners. The control panel can be wiped with either a damp or dry cloth.
Spray polishes must not be used on the control panel surface or knobs. Care must be
taken to prevent any liquid from entering the appliance.
PRACTICAL TIPS
- If the water is very hard, it is recommended that a water softener be added to the
system so as to reduce the formation of limescale in the boiler exchangers. This will
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ensure that the efficiency of the unit remains the same over time, reducing gas
consumption and maintenance costs.
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N
- If the boiler should be out of use for a prolonged period, it is recommended that the
electrical power supply be disconnected and that the external gas cock “M” and “N”
be closed. If low temperatures are expected, the boiler and system pipe work should be
drained in order to prevent frost damage.
- To improve comfort and take full advantage of the heat produced by the boiler, it is
recommended that an external (room) thermostat be installed.
- It is good practice to clean and service the appliance and central heating system every
year. Call an Authorised Service Centre.
IGNITION PROCEDURE
Turn the selector knob “A” to the “I” position. After a short delay the display will indicate
“on” indicating that the boiler is ready to operate. The electronic control unit will ignite the
burner, without any manual intervention but in response to the request for Domestic Hot
Water or Central heating. If, after approximately 10 seconds, the burner has not ignited,
the boiler safety devices will shut off the gas and the display will
A0 1
indicate the fault code A . To reset the ignition system, the reset
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button “D” must be pressed and released. Should the boiler fail to
ignite a second time, check that the external gas cock is open “N”.
If the problem persists, contact an Authorised Service Centre.
PL004D
PL004D
WINTER AND SUMMER OPERATING MODES
In the ‘winter’ operating mode, the boiler will produce both Central
Heating and Domestic Hot Water. In the ‘summer’ operating mode, the
boiler will produce only Domestic Hot Water.
D
PL006C
Using the knobs on the control panel, the user can select ‘winter’ or ‘summer’ operating
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mode.
summer
Keeping the knob “C” at the “
operating mode, the symbol “
” position selects the ‘summer’
“ will illuminate. ‘Winter’ operating
summer
mode may be selected by positioning the knob “C” between the
min. and max. settings. The symbol “ “ will illuminate.
C
winter
ADJUSTING THE HEATING
PL009D
winter
It is possible to set the temperature of the Central Heating system
by adjusting the knob “C”. By positioning the indicator somewhere
between min. and max., a temperature may be obtained which
varies from approximately 42˚C to about 82˚C.
C
PL007C
The water temperature in the Central Heating circuit may be
checked on the display.
PL009D
EXTERNAL (ROOM) THERMOSTAT CONTROL
C
If an external (room) thermostat is installed, it is recommended that the temperature of
the Central Heating system be set by means of the “C” knob, leaving it at max in order
to obtain the best performance from the boiler and to allow the regulation of the external
temperature to function efficiently.
PL008D
SETTING THE HOT WATER FOR DOMESTIC USE
C
Both in the winter and summer mode, the temperature of the Domestic Hot Water may be
adjusted by using the “B” knob. A delivery temperature for the water may be chosen in a
range from 36˚C to about 56˚C, depending on the flow rate of the water and the position
of the knob between the min. and max. settings.
PL008D
The water temperature in the primary circuit may be checked on the display.
NOTE:
Should the hot water temperature be insufficientm turn the thermostat
knob to maximum and reduce the flow rate at the tap. ( A high flow rate will
reduce the temperature.
B
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ECONOMY/COMFORT MODE
E
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C
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The selector knob “E” allows the user to choose the economy mode (position “E”) or the
comfort mode (position “C”).
The economy mode is the normal state for the operation of the boiler, since the domestic
water is heated up only when a tap is turned on.
The comfort mode is a special operating state, because the water contained in the
secondary exchanger and in the primary exchanger is kept in a pre-heated condition,
thereby allowing a quicker delivery of Domestic Hot Water when required.
confort
economy
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C
TURNING OFF THE CENTRAL HEATING
To turn off the Central Heating, rotate the “C” knob to the “
” position.
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The boiler will stay in ‘summer’ mode, providing Domestic Hot Water on request.
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TURNING OFF THE BOILER
To turn the boiler off, rotate the selector knob “A” to the “0” position (OFF); the display
will go off. Close the gas cock located under the boiler and turn the electricity supply
switch (located outside the boiler) to the OFF position.
PL004D
3. USEFUL INFORMATION
AND TROUBLESHOOTING
BOILER SHUTDOWN SITUATIONS
The boiler is equipped with safety devices that intervene in certain situations and shut it
off. Most of these situations are signalled by means of the L.E.D.s and in some
circumstances the user may be able to remedy them.
SHUTDOWN DUE TO IGNITION FAILURE
This anomaly is indicated by “A 0 1” on the display. To reset the boiler, press and then
release button “D”.
At this point, the electronic ignition system will attempt to light the burner again.
Should the boiler fail to ignite a second time, check that the external gas cock is
open. If the problem persists, contact an Authorised Service Centre.
SHUTDOWN DUE TO OVERHEATING
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This anomaly is indicated by “A 0 3 ” on the display. The boiler has shutdown because
the safety thermostat detected that the boiler temperature has exceeded the maximum
limit.
To reset, wait until the boiler has cooled and press button “D”.
If the safety thermostat operates on a frequent basis, contact one of our Authorised
Service Centres.
PL055D
SHUTDOWN DUE TO INSUFFICIENT WATER CIRCULATION
This anomaly is indicated by “E 0 2 ” on the display.
One of the possible causes of this shutdown situation could be the lack of water in the
boiler or water circulation failure in the primary heating circuit.
Check the system pressure on the pressure gauge “K” and, if it
is less than 0.5 bar, try bringing the system pressure up to a
mean value of 1.0 bar by opening the water inlet valve as
instructed on page 3. Then reset by pressing button “D”.
K
OTHER SHUTDOWN SITUATIONS
PL012D
Should a shutdown situation indicated on the display by the following letters and figures
occur, E04, E05, E06, E07, E08, E09, E20, E33, E34 contact one of our Authorised
Service Centres.
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