Cola Johanna Comby2 User manual

Johanna Comby2
Use and maintenance manual
Read the instructions carefully before installation and use of the range cooker.
48.41.35.080.GB-07/09

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Johanna Comby2
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Contents _
1 –GENERAL INFORMATION
1.1 Introduction
1.2 Safety rules
1.3 Technical description
1.3.1 Secondary air flow control
1.3.2 Thermostat
1.3.3 Oven bypass damper
1.3.4 Flue pipe connection collar
1.3. Fire door and ash pan
1.3.6 Hotplate
1.4 Permitted and prohibited fuels
1. Accessories
1.6 Reference standards
1.7 Dataplate
1.8 Ordering replacement parts
1.9 Disposal of the cooker
2 – INSTALLATION
2.1 General instructions
2.2 Positioning and fire-prevention
2.3 Connection to the flue
2.4 Ventilation
2. Advice on flues and connections
2.6 Water connections
2.7 Electrical connection
3 – INSTRUCTIONS FOR USE
3.1 Introduction
3.2 Bottom baffle
3.3 First use
3.4 Adjusting the combustion air flow
3. Lighting and controlling the fire
3.6 Normal operation
3.7 Warm weather operation
3.10 Operation of the oven
4 – CONTROL PANEL
4.1 Pushbuttons
4.2 LEDs
4.3 Display
4.4 User functions
4.4.1 Turning the cooker on and off
4.4.2 Cooker in operation
4.4.3 Changing the temperature setting
5 –MAINTENANCE AND CARE
.1 Maintenance of the cooker exterior
.2 Removal/disposal of ashes
.3 Cleaning the cast iron hotplate
.4 Cleaning the flue
. Cleaning the oven
.6 Accessing internal parts
6 – TROUBLESHOOTING
6.1 The cooker fails to operate
6.2 The cooker is difficult to light
6.3 Smoke leakage
6.4 The glass gets dirty quickly
6. Condensation in the firebox
6.6 The oven does not heat up
6.7 Radiators or central heating system inefficient
6.8 Control unit alarm messages
7 - ATTACHMENTS
7.1 Warranty certificate
7.2 CE marking information

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1 –GENERAL INFORMATION
1.1 Introduction
Dear Customer,
First of all we wish to thank you for the trust placed in us by purchasing one of our products. Please read and carefully follow
the advice given in this installation, use and maintenance manual in order make best use of the product.
Make sure:
-that installation, testing and annual cleaning are carried out by a authorised technician
otherwise the warranty will be void.
-that the flue is checked by a authorised technician;
For operating faults, doubts or problems please contact your nearest service centre.
1.2 Safety rules
-Read and follow the instructions in the installation, use and maintenance manual.
-The heating stove must not be used without being connected to the heating water system and without
water in the heating chamber.
-Connect the stove to a flue in conformity with the regulations and not shared by other appliances.
-Make sure the stove is cold before carrying out any cleaning or maintenance.
-Do not use flammable liquids or substances (alcohol, hydrocarbons) to light the stove.
-The stove is suitable for intermittent combustion and must only be fed with fuels having the characteristics
described in this manual.
-The room where the stove is installed must have openings or air inlets communicating with the outside of
the house and able to ensure sufficient air change.
-Do not close the combustion air inlet and fume outlet openings.
-Do not handle easily flammable or explosive substances in the vicinity of the stove when it is operating.
-During operation, the intense heat generated by combustion of the wood makes the outside surfaces of the
stove very hot, and in particular the fire door, handle, exhaust pipe and cover. Therefore avoid contact with
such parts without suitable protection.
-Keep objects that are not heat-resistant at a suitable distance.
-Clean the ash pan regularly.
-Do not put hot ashes in the rubbish bin or leave them unattended outdoors.
-Warn children and guests about the above risks.
-In case of operation anomalies, relight the stove only after eliminating the cause of the problem.
- Very hot fats and oils tend to catch fire easily, therefore food rich in fatty substances must be prepared with
maximum attention.
- If a foul air/steam extractor hood is operated in the same area or near the stove, burnt gases may escape
from the fire door during loading, if the room is not adequately aired from the outside.
- The oven must only be used for its intended purpose, i.e. for heating and/or cooking food; any other use is
deemed improper and hazardous.
For the electrical connection, respect the following additional rules:
-Connect the stove to an approved 230 Volt - 50 Hz electrical socket.
-The power cable must be connected to a controlled socket.
- Make sure the electrical system and sockets are suitable for the max. absorption of the appliance, given on
the label and in this manual.
- The control panel must be switched on during range operation.
Cola s.r.l. declines any liability for problems, breakage or accidents caused by failure to follow or apply the
instructions contained in this manual.

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1.3 – Technical description
Structure
Firebox
Rated heat output
Heat output in H2O production
Nominal output
Heat output in air heating Nominal
output
Efficiency
Flue pipe
Flue gas temperature
Power supply
Power consumption
CO emissions to 13% O
Recommended quantity of wood per load
Firebox capacity
Weight
Dimensions (mm)
steel and cast iron
steel and cast iron
kW 27
kW 21.5
kW 5.5
73%
Ø 150 mm
283°C
230V/50 Hz
90 W (central heating only module)
180W (optional central heating + domestic hot water module)
0.674%
Approx. 2.5/3.5 kg
25 litres
278 kg
H x W x D = 913 x 1070 x 730 mm (fig. 1)

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Johanna Comby2
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910
117
743
A
0
680
154
189
1070
213
289
461
123
58
86
Dettaglio A
50
390
793
600
850
Key:
A- fire door
B- combustion air thermostat
C- screw for raising the grate
D- ash door
E- combustion air control
F- thermostat inspection door
G- main / warming oven door
H- hotplate
I- oven bypass control lever
L- flue outlet
M- heating system flow (male 1”)
N- heating system return (male 1”)
O- Temp. and Press. relief valve discharge
(male ¾” )
P- DHW flow (male ½”)
Q- mains water inlet (male ½)
R- expansion tank flow (male 1”)
S- expansion tank return (male 1”)
T- rear flue outlet
U- access hole for screwdriver
operated air vent
Fig. 1 Johanna Comby range cooker dimensions
A
G
E
B
D
C
F
L
H
M
P
Q
N
O
R
S
I
T
U

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Warning: higher settings or settings other than those indicated here could cause irreparable damage to the structure of the
cooker.
1.3.3 Oven bypass damper
Fig.1 Oven bypass open
Fig.2 Oven bypass close
The Thermostat
(B)
controls the flow of incoming co
mbustion air and thereby
automatically regulates the firebox water temperature between 0 and 70 °C.
With the thermostat set to zero and the secondary air flow control closed, the
range cooker fire will tend to go out due to a lack of combustion air.
When the thermostat is set to position , the combustion air flow is controlled in
such a way as to maintain the firebox water at a constant temperature of 70°C.
1.3.2 Thermostat
The oven bypass control lever is located above the oven door. When the lever
is pushed towards the inside of the cooker (fig.1), the flue gases flow over the
oven and under the hotplate towards the flue outlet (position recommended
when lighting the cooker). Pulling the lever towards the front of cooker (fig. 2)
forces the flue gases to circulate around the oven, thereby increasing the oven
temperature uniformly (position recommended during normal operation).
1.3.1 Secondary air f ow contro
Combustion air flow is regulated by way of t
he control
(E)
located on the
ash door (D). Only when lighting the cooker, extra combustion air can be
obtained by leaving the ash door open; (warning: during normal operation
the ash door must remain closed).
When the control is set to position 3, corresponding to maximum
combustion air flow, the range cooker reaches its rated heat output.
The secondary air flow control must be set to zero (closed) when
combustion is controlled with the thermostat (B).

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1.3.4 F ue pipe connection co ar
The flue pipe connection collar is located on the top of the range cooker at the right.
1.3.5 Fire door and ash pan
The doors are opened by turning the handles; when the range cooker is in operation, it is advisable to use the protective
glove supplied to open the fire door and the oven door.
The secondary air flow control (E)is integrated in the ash door .
1.3.6 Hotp ate
The cast iron hotplate of the range cooker is designed for cooking. In the hot zone of the hotplate there is a series of
concentric rings . These rings can be removed using the poker supplied.
1.4 Permitted and prohibited fuels
Permitted fuels are natural wood logs, dry and free of resin (beech, oak and birch), 20-2 cm long. The wood should be
seasoned for at least two years; a maximum moisture content of 20%, is recommended in order to ensure combustion
without excessive smoke and soot.
Do not use:
-coal dust;
-small pieces of wood (only permitted as kindling);
-bark and wood shavings;
-general waste;
-treated paper and cardboard;
-wood treated with preservative.
The burning of waste is prohibited under European and National law.
The gases produced by combustion of unsuitable materials may cause damage to the stove and the flue, as well
as seriously harm your health.
The use of any fuel that does not not comply with the above indications shall void the warranty.
1.5 Accessories
Your TERMOJOHANNA range cooker is supplied with the following accessories:
-Instruction manual
-Poker
-Protective glove
-2 oven shelves
-Wrench for lifting the grate
-Blanking plugs.
The control panel can be installed on the cooker or in a remote location,
such as, for example, on the wall of another room in the building.
In the latter case, it will be necessary for a technician authorised by the manufacturer
to install an electrical connection between the cooker and the control panel.
The cooker is supplied with blanking plugs and a support to be applied to the cooker in place of the control panel.
1.6 Reference standards
UNI 10683/98: standard specifying installation requirements for wood fired heating appliances and cookers, including stoves
with natural and forced draught with heat outputs <3 kW.
EN 12815: European standard Norme for cookers fired by solid fuel, containing requirements for design, fabrication,
construction, safety and performance , instructions and markings, together with the relative homologation test methods.
Standards EN 60335-1 and EN 50165: standards regarding electrical equipment on non-electric appliances.

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1.7 Dataplate
The dataplate is affixed to the rear of the cooker. It bears the following data:
-model;
-serial number;
- fuel type;
- heat output;
- fuel consumption;
- min. flue draught;
- average flue gas temperature;
- energy efficiency;
- flue pipe size;
- cooker external dimensions;
- minimum safety clearance;
- weight.
1.8 Ordering replacement parts
For the end-user:
Contact your service centre and/or dealer to order replacement parts.
For the service centre or dealer:
To order replacement parts, contact the Cola s.r.l. service centre and/or send a fax clearly specifying the following
information:
-cooker model;
-serial number;
-date of purchase;
-list of parts required;
-details of any faults encountered.
- All servicing of cooker components must be carried out by authorised and/or qualified personnel.
- Make sure that all electrical connections are disconnected before carry out any servicing operations.
- Use only original Cola replacement parts.
1.9 Disposal of the cooker
For disposal, the cooker must be sealed inside strong packing; contact your local authority for information on how to
proceed in accordance with applicable local regulations.

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2 – INSTALLATION
Under no circumstances may the range cooker be used without connection to the
centra heating system.
2.1 General instructions
The range cooker must be installed in accordance with local regulations. Observe also the following general rules: maintain
a minimum clearance of 20 cm between the cooker and combustible or easily combustible materials; if the floor is made
from combustible material (wood, carpet, etc.), the cooker must be placed on a protective base; your installer will be able to
advise you on the dimensions of this base .
Set the stove down on the floor carefully without jolting and position it in required place. Make sure the floor can support the
weight of the stove, otherwise consult a specialised technician.
2.2 Positioning and fire-prevention
To prevent the risk of fire, the structures surrounding the cooker must be protected from heat. For example, floors in wood or
combustible material must be suitably protected with steel plate or toughened glass. If the flue passes underneath or
through any wooden beams or boards, these must be protected with fireproof material.
2.3 Connection to the flue
The Johanna range cooker is to be connected to a chimney by way of the flue collar on the hotplate and
commercially-available flue pipes. Connection to the chimney must be made using sturdy, stable pipes, with a
recommended minimum wall thickness of 1.5-2 mm. The flue pipe connecting the cooker to the chimney should
be as straight and as direct as possible to prevent loss of draught. The joints at either end of the flue connection
pipe must be effectively sealed.
When the cooker is operating at the rated output, the flue draught should be between 10 and 14 Pa.
For maximum cooker efficiency, a draught restrictor or damper should be installed in the flue pipe or chimney.
Each appliance must vent its combustion gases through its own flue; two or more appliances must never share
the same flue.
2.4 Ventilation
The quantity of air required for combustion is drawn from the room in which the range cooker is installed, either through the
opening in the ash door or the inlet controlled by the thermostat, and directed to the combustion zone; it is therefore
necessary to ensure that the air change rate of the room in which the cooker is installed is sufficient to ensure optimal
combustion. Air openings or vents connecting the room to outdoors must be provided to ensure adequate ventilation even
when the doors and windows are closed. A lack of combustion air will impair the flue draught, thus compromising the
operating safety of the cooker. The quantity of combustion air required by the Johanna range cooker is estimated at around
30 m3/hour.
The operation of any air extraction device (e.g. fume extractor hood) in the vicinity of the cooker may create a condition of
negative pressure in the room, with the consequent leakage of combustion gases from stove when the fire door is opened to
load wood.

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10 Johanna Comby2
Roof pitch (α)
(α)(α)
(α)
Distance A H
15° 1.00 m
30° 1.30 m
45° 2.00 m
60°
Greater than 1.85 m
2.60 m
2.5 Advice on flues and connections
Flues and chimneys must be constructed of suitable materials and properly insulated to prevent heat loss.
The inner walls must be perfectly smooth, with no restrictions or protrusions along the entire length so as to avoid the
creation of friction and vortices in the smoke with a consequent loss of draught.
The doors of all cleaning and inspection access points must properly closed when the cooker is in operation.
The chimney outlet must be 0. m higher than any obstacle located within a 10 m radius and must terminate in a cowl or pot
with a cross-sectional area at least twice that of the flue.
The two diagrams below give the positioning and clearance data for chimney cowls as prescribed by UNI 10683/98.
ostacolo
Inferiore di 5 m
Min 0.5m
Min 0.5m
circa 0.5m
Min 0.5m
La bocca del camino deve essere di almeno
0.5m dalla sommità di un ostacolo se questi
si trova ad una distanza inferiore ai 10m
fig 2 Chimney cowl positioning and clearances
UNI 10683/98 tables
Roof pitch (α)
(α)(α)
(α)
Distance B H
15° 0.50 m
30° 0.50 m
45° 0.50 m
60°
Less than 1.85 m
0.50 m

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11 Johanna Comby2
Before connecting a range cooker to an existing chimney, in addition to the requirements described above, check
that there are no apertures or cracks where air could penetrate and cause heat loss and thus impair the draught.
Check also that there are no obstructions caused by foreign bodies or a buildup of soot.
The first section of the flue pipe
connected to the cooker should
be vertical. At the joint between
the connection pipe and the
chimney flue, the connection
pipe must not protrude into the
chimney flue by more than a
few centimetres to avoid
reducing the cross-sectional
area of the flue.
In cases where the flue pipe is
not perpendicular to the axis of
the chimney, it is advisable to
make the connection with
special steel fittings that allow a
maximum gradient of 4 °.
If the walls and ceiling are constructed from combustible materials, all parts adjacent to the flue pipe must be suitably
insulated. All joints must be properly sealed, particularly the joint where the connection pipe from the stove enters the
chimney.
If more than one stove or cooker is installed in the building, each appliance must have its own flue. We strongly advise
against making holes in the flue for the connection of pipes from other appliances as this could impair the draught.
UNI 7429 stipulates that chimney cowls should meet certain requirements; firstly, their cross-sectional area must be at least
twice that of the flue. It is advisable to install an anti-downdraught chimney cowl or pot to ensure the dispersal of flue gases
even in the presence of strong winds.
YES NO
NO YES YES
Fig. 4 Terminal chimney
2.6 Water connections
The Johanna Comby range cooker has internal central heating and domestic hot water (optional) circuits complete with
circulating pumps, relief valves, temperature sensors and a pressure switch.
The central heating circuit can be connected directly to a central heating system (radiators and/or other heat emitters) in the
same way as an ordinary boiler.
If the cooker has to be interfaced with an existing central heating system, to prevent interference between the fluids and
pressures of the cooker system and the central heating system, Cola recommends installing an insulated heat exchanger
with a power rating of 20-2 kW.
The optional domestic hot water circuit of the cooker comprises a pump and stainless steel plate-type heat exchanger for
instantaneous water heating with a minimum flow rate f 8 l/min at the rated heat output.
Fig. 3 cooker - flue connection
NO
NO
YES
MAX 45°

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The plumbing diagram for the cooker's internal circuit is shown in the figure below.
Fig.5 Idraulic diagram
Idraulic diagram of the cooker Cola mod.JOHANNA COMBY rif. Johanna-idr 01-06
Inlet heating circuit
(male 1”)
Outlet heating circuit
(male 1”)
Water supplier ½”
Inlet domestic hot
water circuit (male ½”)
Water drain cock
(male ¾”)
Stoves connections for heating circuit and
domestic hot water circuit
1-Drain cock 9-Automatic water valve
2-Air vent 10-Connection tube tank-boiler 1”
4-Safety valve P>3 bar-T>90°C 11-Safety tube tank-boiler1”
5-Safety valve Pmax 6 bar 12-Valve inlet pump
6-Flow switch 13-Circulationg pump
7-Plate-type heat exchanger 14-No return valve
8-expansion tank
Air temperature sensor
Water inlet temperature sensor
ST1
SA
Water supplier ½”
Domestic circuit esternal cooker
Vv=0,05x(Vc+Vi)
Vi= tank volume
Vc=tubes volume
Boiler
Johanna Comby

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The system includes the following safety devices:
-Temperature relief valve preset to open at temperatures in excess of 9 °C to ensure that the temperature of the
water in the system does not exceed the safety limit.
-Pressure relief valve preset to open when the pressure in the heating circuit exceeds 3 bar
-Pressure relief valve (installed in the optional domestic hot water circuit) preset to open when the pressure in the
hot water circuit exceeds 6 bar.
Water discharged from the safety devices is directed to a single ¾” male connection for discharge into a waste pipe (e.g.
the waste pipe from a sink).
According to I.S.P.E.S.L. (Italian Institute of occupational safety, health and prevention) standards, collection <<R>> ,the
range cooker as a solid-fuel fired heating appliance and its system must be equipped with an open expansion tank (8)
complete with overflow pipe (11) and water inlet pipe (10); this circuit, which must be installed by a specialised technician, is
the responsibility of the customer .
The safety components meet the requirements of the I.S.P.E.S.L. standards and Pressure Equipment Directive
(PED) 97/ 3/EC.
2.7 E ectrica connection
Make sure the electrical system complies with the regulations and is equipped with an earth connection and a
residual current circuit breaker in accordance with the applicable standards.
The power supply cable must be connected to a Switched socket.
The supply voltage must match that specified on the cooker dataplate and in the technical data section of this manual.
Flussostato
sanitario
Sonda mandata
Estrattore
fumi
Fig. 6 Wiring diagram

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3 - INSTRUCTIONS FOR USE
3.1 Introduction
Never leave children unsupervised in the vicinity of the cooker; there is a very high risk of burns from the hot surfaces.
Also:
- never use the cooker with the door open;
- never store firelighters or other easily combustible materials in the vicinity of the cooker;
- never attempt to move or lift the cooker by the handles.
3.2 Bottom baffle
Before operating the cooker, make sure that the bottom baffle, located underneath the removable stainless steel base plate
of the oven, is in the correct position (as shown in the figure).
For removal of the oven base plate, see the paragraph "Cleaning the flue".
3.3 First use
Remember that the range cooker must not be operated without being connected to the central heating system.
Before using your cooker for the first time, it is important to follow a few simple rules: clean the range cooker thoroughly and
then preheat it with low flame for about 30 minutes with the oven door open; ensure also that the oven bypass damper is
open by pushing the lever located above the oven door towards the inside of the cooker. After approximately 30 minutes,
close the oven bypass damper by pulling the lever towards the front of the cooker, but leave the oven door open.
After ighting the cooker for the first time, a ow it to burn with a ow f ame for severa hours! You can then build up
the fire gradually, thereby drying out any residual moisture in the cooker and its materials. It is important to follow this
procedure in order to avoid damaging the cooker by a sudden increase in temperature.
Warning: when the cooker is first lit, some unpleasant odours may be released; ensure the room is well-ventilated.
3.4 Adjusting the combustion air flow
The combustion air flow and the heating power of the cooker can be adjusted by way of the rotary control (E)
located in the ash door and the thermostat (B). Apart from the combustion air flow, the flue draught is the single most
important factor affecting combustion intensity and thus the cooking and heating power of your JOHANNA range cooker.
The greater the draft, the less combustion air the cooker will require and vice versa.
Check that the bottom baffle is firmly
located in its seating and that it positioned
so as to allow the flow of combustion gases.

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3.5 Lighting and controlling the fire
With the oven bypass damper set to the open position, and the combustion air controls E and B fu y open, set light to
some paper or a firelighter with some wood kindling. When the kindling has caught, place a log about 30 cm long on the fire.
When the fire is well established, close the oven bypass damper and adjust the combustion air flow control (E) to obtain the
desired heat output: position 1 gives a slow burning fire with a moderate heat output, while in position 3 the air flow is
increased to obtain a fast burning fire with a high heat output.
The ash door must a ways be c osed when the cooker is in operation to avoid damage through overheating: it can
on y stay open for a imited time during the cooker ighting stage (max. 15 – 20 min.).
Never use petrol, alcohol or other flammable liquids to light the cooker!
3.6 Normal operation
It is advisable to remove any ash from the grate using the poker provided before loading wood. Put 2-3 logs of firewood on
the fire bed.
3.7 Warm weather operation
When the external temperatures exceeds 1 °C, the draught may be impaired as the heat output of the cooker fire is
reduced, so that combustion gases are not completely expelled, leading to a smell of smoke in the living space. If this is the
case, open the oven bypass damper, clean all the ash from the grate and increase the combustion air flow by way of control
(E).
3.8 Operation of the oven
The cooker is equipped with a conventional static oven with a stainless steel interior and 2 internal shelves.
A thermometer installed in the enamelled oven door shows the oven temperature.
The oven bypass damper must be closed for the oven to reach normal cooking temperature.
When the cooker is lit for the first time, the oven should only be used after 1-2 hours operation at normal temperature (200-
2 0) °C with the oven door left slightly open to eliminate fumes produced by residues of the manufacturing process, such as
grease, oil and sealants; after this initial period, the oven may be used to cook food.
Clean the oven after each use following the instructions given in the relative paragraph of this manual.
The oven may only be used for the purposes for which it is intended, i.e. the cooking of food; any other use
is deemed improper and potentially dangerous.
N.B. When the range cooker is used for cooking food both on the hotplate and in the oven, it is advisable to raise the ash
grate by turning the screw (C) using the wrench supplied.

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4 CONTROL PANEL
The figure below shows the control panel and its functions:
P1 ON/OFF
sblocco
Led deviatore
sanitari ON
Led estate
ON
Led pompa
acqua ON
P4 -Set/menù
P3 -Modo estate/inverno
-Decremento
P2 -ON/OFF Uscita
ausiliaria
-Incremento
Display
Led uscita
Ausiliaria ON
Fig 7 control panel
4.1 Pushbuttons
P1 – ON/OFF release:
- Press this button for one second to switch the water heating module on or off, depending on the current status.
P2 – Auxiliary output ON/OFF / increase value:
- Press this button for one second to switch the auxiliary output on or off.
- In temperature setting mode, increases the value on the display.
P3 – Summer-Winter mode /decrease value:
- Press this button for one second to select Summer or Winter operating mode.
- In temperature setting mode, decreases the value on the display.
P4 – Set / menu:
- Press this button for one second to access the temperature setting mode and the technical parameters menu.
4.2 LEDs
Water pump ON light:
This LED is illuminated when the circulating pump is on.
Summer ON light:
This LED is illuminated when Summer operating mode is selected In Summer mode, the diverter valve activates
the DHW outlet so that water flow is directed to the DHW system only.
DHW diverter ON light:
This LED is illuminated when the diverter valve activates the DHW outlet.
Auxiliary output ON light:
This LED is illuminated when the auxiliary output is activated.

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4.3 Display
-During normal operation, the display shows the temperature of the firebox water
-During operation of the domestic hot water system, displays the message DHW
-In temperature and parameter setting mode, shows the name of the parameter currently being set.
4.4 User functions
4.4.1 Turning the cooker on and off
Press button P1 for one second to switch on the control panel for the water heating module.
It is important the the control panel is switched on during operation of the cooker.
4.4.2 Cooker in operation
In ON status, the display shows the temperature of the water flow (first and second digit) and return (third and fourth digit).
When the firebox water temperature reaches the value preset by the manufacturer, the cooker starts the DHW pump. When
the hot water reaches the temperature set by the user, it starts the CH pump, thereby allowing central heating system to
heat up.
If Summer mode is selected, the cooker will activate the DHW pump only and not the CH pump.
4.4.3 Changing the temperature setting
You can change the temperature setting for the firebox water at any time; simply press button P4 and then press button P2
or P3 to increase or decrease the value as required.

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18 Johanna
Comby2
4.5 BUZZER
If the temperature rises above 80°C, the control unit will emit an audible beep and
the display will flash to warn the user of overheating.
5. MAINTENANCE AND CARE
To maintain the cooker in good working order it is good practice to regularly clean the exterior and internal parts where
there is buildup of soot , which, in addition to blocking the air flow and thus impairing efficiency, can sometimes also
catch fire.
5.1 Maintenance of the cooker exterior
All maintenance operations, and in particular cleaning the glass, must be carried out only when the cooker is cold.
Always dry the surfaces after cleaning.
5.2 Removal/disposal of ashes
The JOHANNA range cooker is equipped with a fuel loading grate. All ashes should be removed from this grate before
loading fuel.
Do not allow the ashes to build up in the ash pan under the grate, as this will obstruct the flow of fresh air required for
combustion.
Warning: hot ashes must not be put into waste bins. To avoid risk of fire, allow the ashes to cool in the open air inside a
suitable container.
5.3 Cleaning the cast iron hotplate
Before lighting the cooker for the first time, we recommend that you clean the hotplate with an absorbent cloth in order to
remove the protective grease.
Before first use and after cleaning, the hotplate should be preheated for about half an hour with the oven door open and
the oven bypass damper lever pushed towards the inside of the cooker.
For everyday cleaning of the hotplate, we recommend the use of slightly abrasive materials (e.g.: glass paper or steel
wool), rubbing gently in the direction of the surface finish.
Before periods of non-use, apply a thin film of olive oil or neutral vaseline to the hotplate to protect it.
5.4 Cleaning the flue
A reduction in the heat output and leakage of fumes into the living space can almost always be attributed to obstruction
of the flue. The cooker flue must be cleaned at regular intervals: the rate at which soot accumulates will depend largely
on the type of fuel burnt and how the frequently the cooker is used, but also on the efficiency of the flue.
To clean the flue, proceed as follows to avoid soot dispersal:
-Clean only when the cooker is cold;
-Close all the openings which are not to be cleaned;
-Disconnect the flue pipes:
-Remove the hotplates from the range cooker and
clean the undersides of the hotplates outdoors.
-Remove the oven base plate as shown in the figure,
then scrape the soot off the area under the oven.
-After cleaning all the flueways, close the control
(B) located under the oven.
Fig 8 Take off oven base-plate
Oven base plate

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19 Johanna Comby2
5.5 Cleaning the oven
The oven should be cleaned after each use when only slightly warm or cold to prevent cooking residue from hardening on
the surfaces.
To clean the stainless steel surfaces of the oven, use a non-abrasive detergent with a soft cloth and then rinse thoroughly to
remove all traces of detergent which could otherwise contaminate food or corrode the oven.
5.6 Accessing internal parts
All servicing of the internal components of the cooker must be carried out by authorised and/or qualified personnel; contact
your nearest service centre.
Before servicing, make sure that the cooker is unplugged from the electrical power supply.
To access the internal parts, remove the side panel by undoing the retaining screws.
Figure 9a shows the water heating module with the optional DHW unit.
9.4
9.6
9.3
9.10
9.9
9.8
9.2
9.1
9.7
9.12
9.5
9.11
9.1
Expansion tank connections
9.2 System drain cock
9.3 Pressure relief valve
for DHW system, p>6 bar
9.4 Flow switch
9. Shutoff cock
for heat exchanger replacement
9.6 Plate-type heat exchanger
9.7 Non-return valve with union
for circulating pump, 1” M.
9.8 CH circulating pump
9.9 DHW circulating pump
9.10 Pressure relief valve
for CH system (p>3 bar)
9.11 Air vent (screwdriver operated)
9.12 Ball valve with union
for circulating pump, 1”F
(screwdriver operated)
Commento [e1]:

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20 Johanna Comby2
6 – TROUBLESHOOTING
6.1 The cooker fails to operate
-Check that the flue connector and the dimensions of the flue pipe are suitable for the
heating power of the cooker.
- Check that the flue is constructed in accordance with the applicable regulations.
- Check that any openings or inspection doors in the flue are properly closed and
sealed.
- Make sure that no other appliances are connected to the flue.
-Check that the cooker is plugged into the electrical outlet socket and that the control
unit is switched on.
6.2 The cooker is difficult to light
-Open the primary air flow control and the oven bypass damper.
- Use wood and lignite blocks with a low moisture content.
- Check that the room is well-ventilated to ensure the cooker receives a sufficient
quantity of oxygen.
-Check that the flue is suitable for the heat output of the cooker.
6.3 Smoke leakage
-Check the flue draught.
- Check that the flue pipe connection is effectively sealed.
- Check that the flow of primary air through the grate is not obstructed by ash.
- Check that combustion residue is not blocking the flueways.
-Check that the primary air control is open.
6.4 The glass gets dirty quickly
-Check that the fuel is of the recommend type.
- Check that the firewood is properly seasoned and dry.
- Too much fuel in the firebox.
- Check the flue draught.
6.5 Condensation in the firebox
- Check that the procedure for first use has been carried out properly.
-Check that the fuel is of the recommended type.
- Check that the firewood is properly seasoned and dry.
- Check that the flue is insulated and constructed in accordance with the applicable
standards.
-Check the flue draught.
-Check the pump startup thermostat and the
pump startup temperature setting.
6.6 The oven does not heat up
- Check that the oven door is properly closed.
-Check that the oven bypass damper is closed (pos.1)
- Check that the fuel burns normally.
- Check that there is sufficient flue draught.
-Check that flueways are clean.
6.7 Radiators or central heating system inefficient
- Check that the system shutoff valves are open.
-Bleed air from the radiators.
- Check that there is water in the system.
-Check that the thermostat control is functioning properly and is set to the right
position.
-Check the control unit is connected to the electrical power supply, that the button is in
the ON position, that the pump functions correctly and that this startup temperature is
set to 50-60°C.
6.8 Control unit alarm messages
-Temperature > 80 °C with emission of audible alarm until temperature
falls and display of message ‘Alr’; reduce temperature both by
closing the primary air control and the thermostat.