Junkers miniMAXX WR 11-2 B Series Technical Document

Read installation manual prior to installation of this unit!
Read user manual before putting this unit in operation!
Observe the warnings in the manuals!
The installation room must fulfill the ventilation requirements!
Installation by an authorised person only!
Installation Manual and Operating Instructions
Gas Heaters
miniMAXX
WR 11 -2 .B..
WR 14 -2 .B..
WR 18 -2 .B..
X XXX XXX XXX PT (05.06) JS

Table of contents
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Table of contents
1 Warnings and symbols 3
1.1 Safety Instructions 3
1.2 Key to symbols 3
2 Information about the heater 4
2.1 Category, type and approval no. 4
2.2 Technical identification code 4
2.3 Package contents 4
2.4 Description of the heater 4
2.5 Special accessories 4
2.6 Dimensions 5
2.7 Functional diagram of the heater 6
2.8 Electrical diagram 7
2.9 Function 7
2.10 Technical characteristics 8
3 Regulations 9
4 Installation 10
4.1 Important information 10
4.2 Selection of the place of installation 10
4.3 Heater mounting 11
4.4 Water connection 11
4.5 Gas connection 11
4.6 Startup 11
5 Operating instructions 12
5.1 Batteries 12
5.2 Before starting up the heater 12
5.3 Turning the heater on and off 12
5.4 Power adjustment 12
5.5 Temperature/flow adjustment 13
5.6 Purge the appliance 13
6 Adjustments 14
6.1 Factory settings 14
6.2 Pressure adjustment 14
6.3 Converting to a different gas type 14
7 Maintenance 15
7.1 Periodic maintenance tasks 15
7.2 Startup after maintenance work 15
7.3 Flue gas safety device 15
8 Problems 17
8.1 Problem/cause/solution 17
9 Environmental protection 18

Warnings and symbols
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1 Warnings and symbols
1.1 Safety Instructions
If there is a smell of gas:
BClose the gas valve.
BOpen windows.
BDo not operate any electrical appliances or switches
(on/off).
BExtinguish any naked flames.
BPhone the gas company or an authorized technician
from a safe distance.
If there is a smell of burnt gases:
BDisconnect the appliance.
BOpen doors and windows.
BInform an installation company.
Fitting, modifications
BThe fitting and modification of the installation of the
appliance must be carried out only by an authorized
technician.
BThe pipes carrying burnt gases must not be modified.
BDo not close or reduce air circulation holes.
Maintenance
BWe reccomend to have the system regularly serviced
in order to ensure that it functions reliably and safely.
BThe installer is responsible for the safety and environ-
mental compatibility of the installation.
BThe appliance should be serviced annually.
BOnly original spare parts must be used.
Explosive and inflammable materials
BInflammable materials (paper, solvents, ink, etc.)
should not be stored near the appliance.
Combustion air and ambient air
BTo avoid corrosion, combustion air and ambient air
should be free of aggressive substances (for example
halogenated hydrocarbons containing chlorine and
fluoride composites).
Client information
BInform the client about the function and operation of
the appliance.
BThis appliance is not intended for use by persons
(including children) with reduced physical sensory or
mental capabilities, or lack of experience and knowl-
edge, unless they have been given supervision or
instruction concerning use of the appliance by a per-
son responsible for their safety.
Children should be supervised to ensure they do not
play with the appliance.
BCaution clients against performing modifications or
repairs themselves.
1.2 Key to symbols
The different types of warnings serve to indicate the
degree of risk, if the damage reduction precautions are
not followed.
•Caution is used to indicate the risk of light material
damage.
•Warning is used to indicate the risk of light personal
damage or more serious material damage
•Danger is used to indicate the risk of serious personal
damage that might in some circumstances be fatal
The indications include important information that does
not necessarily implicate risk to people or the appliance
itself.
The safety instructions in the text appear
on a grey ground and are signaled in the
margin by a triangle containing an excla-
mation mark.
Indications in the text are identified by the
symbol in the margin.
The beginning and end of the text are indi-
cated by a horizontal line.

Information about the heater
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2 Information about the heater
2.1 Category, type and approval no.
2.2 Technical identification code
WWater gas heater
RProportional power adjustment
11 Capacity (l/min)
-2 Version 2
BElectronic ignition powered by 1.5 V batteries
23 Appliance adjusted for natural gas
31 Appliance adjusted for GPL
S... Country code
2.3 Package contents
•Gas heater
•Attachment elements
•Connection elements
•Heater documentation
•Two 1.5 V batteries type R
•Rubber holders (LPG heaters)
2.4 Description of the heater
Operating convenience, as the heater is ready to operate
by simply pressing a switch.
•Heater for wall-mounting
•Ignition by electronic device triggered when the water
valve opens
•Great savings in comparison with conventional heat-
ers, due to the possibility of power adjustment and no
permanent pilot flame
•Natural gas/LPG burner
•Semi-permanent pilot burner which only functions
during the period between the opening of the water
valve and the ignition of the main burner
•Combustion chamber without tin/lead covering
•Water valve in fibreglass-reinforced polyamide, 100%
recyclable
•Automatic adjustment of the water flow by means of
a device which permits a constant flow to be main-
tained in spite of variable pressure supplies
•Gas flow adjustment proportional to the water flow to
maintain a constant high temperature.
•Safety devices:
–Ionisation probe to check for accidental extinction
of the burner flame
–Flue gas safety device which turns off the heater in
case of inadequate combusted gas evacuation con-
ditions
–Temperature limiter which prevents overheating of
the combustion chamber
2.5 Special accessories
•Conversion kit from natural gas to butane/propane
and vice-versa
Model WR 11/14/18 -2 B...
Category II2H3+
Type B11BS
Tab. 1
WR11 -2 B 23
31
S...
WR14 -2 B 23
31
S...
WR18 -2 B 23
31
S...
Tab. 2
0464

Information about the heater
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2.6 Dimensions
Fig. 1
4Combustion chamber
5Burner
10 Temperature/volume selector
20 Gas connection
23 Ignition unit
24 Battery compartment
26 Power selector
34 LED - Burner status check
35 Switch / LED - Battery status check
36 Front
37 Opening for mounting on the wall
38 Connection collar to the combustion gases pipe
39 Flue with non-return device
40 Gas valve
Dimensions
(mm) ABCDEFG
H (Ø)
Natural gas LPG
WR11B 310 580 228 112,5 463 60 25 3/4” 1/2”
WR14B 350 655 228 132,5 510 95 30 3/4” 1/2”
WR18B 425 655 334 132,5 540 65 30 3/4” 1/2”
Tab. 3 Dimensions

Information about the heater
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2.7 Functional diagram of the heater
Fig. 2 Functional diagram
1Pilot burner
2Spark plug
3Ionisation probe
4Combustion chamber
5Main burner
6Injector
7a Screw for measurement of pressure in burner
7b Screw for measurement of input pressure
8Slow ignition valve
9Venturi
10 Temperature/volume selector
11 Water valve
12 Command cone
13 Water flow regulator
14 Water filter
15 Micro-switch
16 Cold water pipe
17 Diaphragm
18 Main gas valve
19 Maximum gas adjusting screw
20 Gas supply pipe
21 Gas filter
22 Hot water pipe
23 Ignition unit
24 Battery compartment
25 Servo valve
26 Power selector
27 Gas valve
28 Pilot valve
29 Pilot injector
30 Pilot gas pipe
31 Temperature limiter
32 Flue gas safety device

Information about the heater
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2.8 Electrical diagram
Fig. 3 Electrical diagram
2Spark plug
3Ionisation probe
15 Micro-switch
23 Ignition unit
24 Battery compartment
25 Servo valve (normally open)
28 Pilot valve (normally closed)
31 Temperature limiter
32 Flue gas safety device
33 Diaphragm valve
34 LED - Burner status check
35 Switch / LED - Battery status check
2.9 Function
This gas heater is equipped with automatic electronic
ignition which simplifies its operation.
BTo do so, just turn on the switch (Fig. 8).
After this procedure, automatic ignition occurs when-
ever a hot water tap is opened. First, the pilot burner is
lit and approximately four seconds afterwards the main
burner. The pilot burner flame is then extinguished after
a short period of time.
This is a way of saving a great amount of energy as the
pilot burner only operates for the minimum necessary
time to ignite the main burner, in contrast to conven-
tional systems which operate permanently.
If thishappens:
BClose and open the hot water tap to repeat the igni-
tion process until all the air has been purged.
Air in the gas supply pipe when the heater
is started up may cause ignition to fail.

Information about the heater
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2.10 Technical characteristics
Technical characteristics Symbol Units WR11 WR14 WR18
Power and flow
Nominal useful power Pn kW 19,2 23,6 30,5
Minimum useful power Pmin kW 7 7 9
Useful power (adjustment range) kW 7 - 19,2 7 - 23,6 7 - 30,5
Nominal thermal flow Qn kW 21,8 27 34,5
Minimum thermal flow Qmin kW 8,1 8,1 10,3
Gas data*
Supply pressure
Natural gas H G20 mbar 20 20 20
LPG (butane/propane) G30/G31 mbar 30/37 30/37 30/37
Consumption
Natural gas H G20 m3/h 2,3 2,9 3,7
LPG (butane/propane) G30/G31 kg/h 1,7 2,2 2,75
Number of injectors 12 14 18
Water data
Maximum permissible pressure** pw bar 12 12 12
Temperature selector in fully clockwise position
Temperature rise °C 50 50 50
Flow range l/min 2 - 5,5 2 - 7 2 - 8,8
Minimum operating pressure pwmin bar 0,1 0,1 0,2
Minimum pressure for maximum flow bar 0,25 0,35 0,5
Temperature selector in fully anti-clockwise position
Temperature rise °C 25 25 25
Flow range l/min 4 - 11 4 - 14 4 - 17,6
Minimum operating pressure bar 0,2 0,2 0,2
Minimum pressure for maximum flow bar 0,6 1 1,3
Combustion products***
Minimum low pressure mbar 0,015 0,015 0,015
Flow g/s 13 17 22
Temperature °C 160 170 180
Tab. 4
* Hi 15 °C - 1013 mbar - dry: Natural gas 34.2 MJ/m3(9.5 kWh/m3)
LPG: Butane 45.72 MJ/kg (12.7 kWh/kg) - Propane 46.44 MJ/kg (12.9 kWh/kg)
** Considering the water dilution effect this value must not be exceeded.
*** For nominal calorific power

Regulations
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3 Regulations
Any local by-laws and regulations pertaining to installa-
tion and use of gas-heated appliances must be observed.
Please refer to the laws that should be attended in your
country.

Installation
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4 Installation
4.1 Important information
BBefore installing, call the gas company and check the
standard relating to gas heaters and ventilation
requirements for rooms.
BInstall a gas cut-off valve as close as possible to the
heater.
BAfter finishing the gas system, the pipes must be thor-
oughly cleaned and leak-tested; to avoid damaging
the gas valve by excess pressure, this test must be
performed with the gas valve of the heater closed.
BCheck if the heater corresponds to the type of gas
provided.
BCheck if the flow and pressure through the installed
reducer are appropriate for the consumption of the
heater (see technical data in the table 4).
4.2 Selection of the place of installation
Requirements regarding the place of installation
•Do not install the heater in rooms with a volume of
less than 8 m3(not including the volume of the furni-
ture providing this does not exceed 2 m3.
•Comply with the specific instructions for each coun-
try.
•Assemble the gas heater in a well-ventilated location
where it will not be exposed to temperatures below
zero and in a place where there is an evacuation pipe
for combustion gases.
•The gas heater must not be installed over a heat
source.
•To avoid corrosion, the combustion air must be free
from harmful substances. Examples of particularly
corrosive substances: halogenated hydrocarbons con-
tained in solvents, paints, glues, engine gases and var-
ious domestic detergents. If necessary, take adequate
measures.
•Respect the minimum installation clearances indi-
cated in Fig. 4.
•The heater must not be installed in locations where
the room temperature can reach 0 °C
In case of a frost risk:
BTurn off the heater.
BRemove the batteries.
BTurn off the heater.
BPurge the heater (see section 5.6).
Fig. 4 Minimum clearances
Combustion gases
•All gas heaters must be connected in a leak-roof man-
ner to a gas evacuation pipe of adequate dimensions.
•The flue must:
–vertical (reduced horizontal sections or no horizon-
tal sections at all)
–be thermally insulated
–have an exit above the maximum roof level
•A flexible or rigid pipe should be used, fit it inside the
flue socket. The external diameter of the pipe should
be slightly smaller than the dimension specified in the
appliances dimensions table.
Danger: Explosion
BAlways turn off the gas cock before car-
rying out any work on components
which carry gas.
The gas installation, the connection of ex-
haust/supply pipes as well as the initial
startup are to be performed exclusively by
authorised gas fitters.
The heater can only be used in the coun-
tries indicated on the rating plate.
Danger: Make sure that all flue
connections are tighten sealed.
BFailure to follow this requirement may
cause dangerous exhaust gases to
enter living space which may result
causing personal injury or loss of life.
³
h
3
3 3
40
³
³
£
L
L (m) h (cm)
0 - 1 3
1 - 2 6
2 - 3 9
3 - 4 24
6720607539-02.4JS
180
30
120
80

Installation
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•The extremity of the evacuation pipe must be pro-
tected against wind/rain
If these conditions cannot be met, a different location
must be selected for the gas intake and evacuation.
Surface temperature
The maximum surface temperature of the heater is less
than 85 °C, with the exception of the combustion gases
evacuation device. No special protection measures are
required for flammable construction materials or built-in
furniture items.
Air intake
The place where the heater is to be installed must have
an area of air supply according to the table.
The minimum requirements are listed above; however,
each country's specified requirements must also be
respected.
4.3 Heater mounting
BRemove the temperature/flow selector and the power
selector.
BUnscrew the front fixing screws.
BWith a simultaneous movement towards you and
upwards, release the front of the two lugs from the
back.
BFix the heater vertically, using the provided screw
hooks and plugs.
4.4 Water connection
It is advisable to purge the installation beforehand,
because the presence of dirt may reduce the flow and,
in extreme cases, cause a blockage.
BIdentify the cold water pipe (Fig. 5, item A) and the
hot water pipe (Fig. 5, item B), so as to avoid any pos-
sible mis-connection.
BConnect the water pipes to the water valve using the
provided connection accessories.
Fig. 5 Water connection
4.5 Gas connection
Any local by-laws and regulations pertaining to installa-
tion and use of gas-heated appliances must be observed.
Please refer to the laws that should be attended in your
country.
4.6 Startup
BOpen the water and gas flow valves and check that all
connections are leak-tight.
BCorrectly insert the two 1.5 V batteries (Fig. 6) type R
provided with the heater.
BCheck if the flue gas safety device is functioning cor-
rectly, proceed as explained in section 7.3.
Caution:
Ensure that the extremity of the evacua-
tion pipe is placed between the ledge and
the ring of the flue.
Appliance Minimum useful area
WR11B ≥60 cm2
WR14B ≥90 cm2
WR18B ≥120 cm2
Tab. 5 Useful areas for air intake
Caution:
Never support the gas heater on the water
or gas connections.
It is advisable to install a non-return valve
on the supply side of the heater to avoid
problems caused by sudden changes in
supply pressure.
Danger: If local regulations are not follow
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
Only use genuine accessories.

Operating instructions
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5 Operating instructions
5.1 Batteries
Battery insertion
BInsert the two 1.5 V R20 batteries.
Fig. 6 Inserting the batteries
Replacing the batteries
The batteries must be changed if the red LED starts
flashing.
Fig. 7 Replacing the batteries
Precautions when using the batteries
•Do not dispose of batteries as domestic waste. Take
them to appropriate collecting places for recycling.
•Do not insert flat batteries.
•Only use the type of batteries indicated
5.2 Before starting up the heater
BCheck if the gas indicated on the rating plate is the
same as the one used at the location.
BOpen the gas valve.
BOpen the water valve.
5.3 Turning the heater on and off
Turning on
BPress the switch , position .
Fig. 8
Green light on = Main burner on
Fig. 9
Turning off
BPress the switch , position .
5.4 Power adjustment
Lower water temperature.
Less power.
Open all water and gas blocking devices.
Purge the pipes.
Caution:
The front panel in the burner and pilot
burner area may reach high temperatures,
with risk of burning in case of contact.
Caution:
BInitial startup must be performed by a
qualified technician who will provide
the client with all the necessary infor-
mation for optimum operation of the
gas heater.

Operating instructions
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Fig. 10
Higher water temperature.
More power.
Fig. 11
5.5 Temperature/flow adjustment
BTurn anti-clockwise
Increases flow and decreases water temperature.
Fig. 12
BTurn clockwise.
Decreases flow and increases water temperature.
Regulating the temperature to the minimum required
value reduces energy consumption as well as the possi-
bility of limescale deposits in the combustion chamber.
5.6 Purge the appliance
If there is a risk of freezing, proceed as follows:
BRemove the retaining clip from threaded bushing
(pos. 1).
BRemove threaded bushing (pos. 2) from water valve.
BEmpty the appliance of all water.
Fig. 13 Purging
1Retaining clip
2Threaded bushing

Adjustments
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6 Adjustments
6.1 Factory settings
Natural gas
Heaters for natural gas H (G 20) are supplied sealed
from the factory after being adjusted to the values indi-
cated on the rating plate.
Liquefied gas
Heaters for propane/butane (G31/G30) are supplied
sealed from the factory after being adjusted to the val-
ues indicated on the rating plate.
It is possible to adjust the power using the burner pres-
sure process, although a pressure gauge is necessary for
this procedure.
6.2 Pressure adjustment
Accessing the adjusting screw
BRemove the front part of the heater (see 4.3).
Connecting the pressure gauge
BUnscrew the shut-off screw.
BConnect the pressure gauge to the measuring point
for the burner pressure.
Fig. 14 Pressure measurement points
Maximum gas flow adjustment
BRemove the screw seal (Fig. 15).
BTurn on the heater with the power selector set to the
left (maximum position).
Fig. 15 Maximum gas flow adjusting screw
BOpen various hot water taps.
BUsing the adjusting screw, regulate the pressure until
obtaining the values indicated in the table 6.
BSeal the adjusting screw once again.
Minimum gas flow adjustment
6.3 Converting to a different gas type
Use only original conversion kits. Conversion must only
be carried out by an accredited technician. Authentic
conversion kits are supplied with installation instruc-
tions.
Sealed elements must not be opened.
Heaters must not be turned on if the con-
nection pressure is lower than 15 mbar or
higher than 25 mbar.
Danger:
The following procedures must only be
performed by a qualified technician.
The minimum gas flow adjustment is per-
formed automatically after the adjustment
of the maximum gas flow.
Natural gas H Butane Propane
Injector
code
WR11
8708202113
(1,10)
8708202130
(0,70)
8708202124
(1,20)
8708202128
(0,72)
WR14
8708202113
(1,10)
8708202128
(0,72)
8708202116
(1,25)
8708202132
(0,75)
WR18
8708202115
(1,15)
8708202130
(0,70)
8708202116
(1,25)
8708202132
(0,75)
Connection
pressure
(mbar)
WR11
WR14
WR18
20 30 37
MAX (mbar)
WR11
12,7 28 35
WR14
12 28 35
WR18
10,3 25,5 32,5
Tab. 6 Burner pressure

Maintenance
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7 Maintenance
To ensure that gas consumption and the environmental
load (pollution, etc.) remain as negligible as possible
over a longer period of time, we recommend that you
assure to have the appliance maintained on an annual
basis (inspection) or if necessary (maintenance).
These jobs can only be done by a Junkers Technical
Assistance delegate.
BUse only authentic spare parts and accessories.
BOrder the spare parts according to the spare parts
catalogue for the heater.
BSubstitute dismantled joints and o-rings with new
ones.
BOnly the following lubricants must be used:
–On hydraulic parts: Unisilikon L 641 (8 709 918
413)
–Threaded joints: HFt 1 v 5 (8 709 918 010).
7.1 Periodic maintenance tasks
Functional checks
BEnsure that all safety, regulatory and checking
elements are in good working order.
Heat exchanger
BInspect the heat exchanger.
BIf it is dirty:
–Dismantle the chamber and remove the regulator.
–Clean the chamber with a pressurized water jet.
BIf the dirt resists: soak soiled parts in hot water with
detergent and clean carefully.
BIf necessary: de-scale the interior of the heat
exchanger and connection tubes.
BReassemble the heat exchanger using new joints.
BRemount the regulator on its support.
Burner
BInspect the burner annually and clean as necessary.
BIf it is very dirty (grease, soot): Dismantle the burner
and soak it in hot water with detergent and clean it
carefully.
Water filter
BReplace the water filter installed in the inlet of the
water valve.
Pilot and main burner
BRemove and clean pilot burner.
BRemove and clean pilot injector.
7.2 Startup after maintenance work
BRe-open all connections. Ensure there are no gas
leaks.
BRead chapter 5 “Use” and chapter 6 “Adjustments”.
7.3 Flue gas safety device
Operation and precautions
The flue gas safety device checks the effectiveness of
flue gas extraction by the flue. If it is inadequate, the
appliance switches off automatically so that the combus-
tion fumes do not escape into the room in which the
appliance has been installed. The flue gas safety device
resets after a cooling-down period.
If the appliance shuts down while in operation:
BVentilate the room.
B10 minutes later, turn on the heater once again.
Call a qualified technician if the same thing happens
again.
Maintenance*
If faults occur on the flue gas safety device, proceed as
follows:
BUndo flue gas safety device fixing screw.
BLoosen temperature limiters connectors.
BReplace damaged component with new one and refit
using the reverse of the procedure set out in the table
above.
Maintenance must only be performed by a
qualified technician.
Warning:
Before performing any maintenance work:
BClose the water flow valve.
BClose the gas flow valve.
Warning:
Is forbidden to start up the appliance
without water filter correctly assembled.
Danger:
The flue gas safety device must not under
any circumstances be switched off, simu-
lated or replaced by any other component
Danger:
The user must never make any modifica-
tions to the appliance.

Maintenance
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16
Function check*
Flue gas safety device function check:
BDisconnect flue pipe;
BReplace with pipe (about 50 cm long) with sealed
end;
BFit pipe vertically;
BStart up appliance at rated output and set tempera-
ture control to maximum temperature;
Under those conditions, the appliance should shut
down after two minutes. Remove temporary pipe and
reconnect flue pipe.
* This work may only be carried out by an approved engi-
neer.

Problems
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8 Problems
8.1 Problem/cause/solution
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart offers solu-
tions to possible problems (solutions followed by an * must be undertaken by qualified technicians only).
Problem Cause Solution
The heater does not ignite.
Slow and difficult ignition of the
burner.
LED next to the switch flashes.
Batteries flat or not inserted cor-
rectly, or switch turned off.
Flat batteries.
Check position and replace them.
Replace them.
Water at low temperature. Check the temperature selector
position and adjust it according to
the desired water temperature.
Water is not heated, no flame. Insufficient gas supply. Check the reducer and replace it if
inadequate or malfunctioning.
Check if the bottles (butane)
freeze during operation, and if so,
move them to a warmer place.
The burner turns off the heater is
operating.
Temperature limiter has tripped.
Flue gas safety device has tripped.
Wait 10 minutes and restart the
heater. If the problem persists, call
a qualified technician.
Vent the area. Wait 10 minutes and
restart the heater. If the problem
persists, call a qualified techni-
cian.
Reduced water flow. Insufficient water supply pressure.
Dirty taps or mixers.
Water valve blocked.
Combustion chamber blocked
(limescale).
Check and correct. *
Check and clean.
Clean filter.*
Clean and de-lime if necessary.*
Tab. 7

Environmental protection
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9 Environmental protection
Environmental protection is a basic company strategy of
Junkers. The quality of our products, profitability and
environmental protection are equal-ranking goals for us.
Laws and regulations concerning environmental protec-
tion are strictly observed. We use the best possible tech-
nology and materials, under economic considerations, to
protect the environment
Packaging
We participate in the recycling program of the respective
country to ensure optimal recycling.
All of our packaging materials are environmental-friendly
and can be recycled.
Old appliances
Old appliances contain valuable materials that should be
recycled.
The assemblies can be easily detached and synthetic
materials are marked accordingly. The assemblies can
therefore be sorted out and passed on for recycling or
disposal.

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