Junkers WRD 14-2 G31, WRD 11-2 G23, WRD 14-2 G23, WRD 18-2 G31, WRD 18-2 G23 User Manual
...
Installation Manual and Operating Instructions
Gas Heaters
miniMAXX
WRD 11 -2 .G..
WRD 14 -2 .G..
WRD 18 -2 .G..
6 720 607 WRDG PT (05.10) JS
Table of contents
Table of contents
Safety information 3
Explanation of symbology 3
1 Technical Characteristics and Dimens. 4
1.1 General Description 4
1.2 Explanation of Model Code 4
1.3 Accessories (Included with Appliance) 4
1.4 Description of the heater 4
1.5 Special accessories 4
1.6 Dimensions 5
1.7 Functional diagram of the heater 6
1.8 Electrical diagram 7
1.9 Function 7
1.10 Technical characteristics 8
2 Regulations 9
3 Installation 9
3.1 Important information 9
3.2 Selection of the place of installation 9
3.3 Heater mounting 10
3.4 Water connection 10
3.5 Hydrogenerator operation 10
3.6 Gas connection 10
3.7 Commissioning 10
4Use 11
4.1 Digital display - description 11
4.2 Before starting up the heater 11
4.3 Turning the heater on and off 11
4.4 Water flow 11
4.5 Power adjustment 12
4.6 Temperature/flow adjustment 12
5 Adjustments 13
5.1 Heater adjustment 13
5.2 Pressure adjustment 13
5.3 Conversion to a different type of gas 14
6 Maintenance 15
6.1 Periodic maintenance work 15
6.2 Startup after maintenance work 15
6.3 Purge the appliance 15
6.4 Flue gas safety device 15
7 Problems 17
7.1 Problem/cause/solution 17
2
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Safety information
Safety information
If you smell gas:
B Close the gas valve.
B Open the windows.
B Do not turn on any electrical switch.
B Extinguish any fire.
B Go to a different location and call the gas supplier or
an authorised technician.
If you smell combustion gases:
B Turn off the heater.
B Open doors and windows.
B Notify a gas fitter.
Assembly, modifications
B The assembly and modifications during the
installation of the heater can only be performed by an
authorised installer.
B Do not modify the pipes which conduct combustion
gases.
B Do not close or reduce air circulation vents.
Explanation of symbology
The safety instructions which appear in
the text have a grey background and are
identified in the margin by a triangle
surrounding an exclamation mark.
The warnings used indicate the degree of risk in case
the precautionary measures are not complied with.
• Caution is used to indicate the risk of minor material
damage.
• Warning is used to indicate the risk of minor personal
injuries or more severe material damage.
• Danger is used to indicate the risk of severe personal
injuries which, in certain cases, may result in death.
Indications in the text are identified by the
symbol in the margin.
i
The beginning and end of the text are
indicated by a horizontal line.
The instructions contain important information which
does not pose a risk to people or the heater.
Maintenance
B The user must periodically maintain and check the
heater.
B The user is responsible for safety and environmental
protection during installation.
B The heater must be serviced annually.
B Only original spare parts are allowed to be used.
Explosive and highly inflammable material
B Do not store or use inflammable material (paper,
solvents, paints, etc) near the heater.
Combustion air and surrounding air
B To avoid corrosion, the combustion air and
surrounding air must be free from harmful
substances (e.g. halogenated hydrocarbons which
contain chlorine and fluorine compounds).
Information to the client
B Inform the client about how to operated and handle
the heater.
B Inform the client that no independent modifications
are permitted.
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Technical Characteristics and Dimensions
1 Technical Characteristics and Dimensions
1.1 General Description
0464
Model WRD 11/14/18 -2 G...
Category II
Type B
2H3+
11BS
Tab. 1
1.2 Explanation of Model Code
W RD 11-2G 2331S....
W RD 14-2G 2331S....
W RD 18-2G 2331S....
Tab. 2
W Water gas heater
R Proportional power adjustment
D Digital display
11 Capacity (l/min)
-2 Version 2
G Electronic ignition powered by hydrogenerator
23 Indicator number of natural gas H
31 Indicator number of LPG
S... Country code
• Temperature sensor to monitor the water
temperature at the heater output
• Great savings in comparison with conventional
heaters, 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
• Heat exchanger 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
maintained 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
conditions
– Temperature limiter which prevents overheating of
the heat exchanger.
1.5 Special accessories
• Conversion kit from natural gas to butane/propane
and vice-versa.
1.3 Accessories (Included with Appliance)
• Gas heater
• Attachment elements
• Connection elements
• Heater documentation.
1.4 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
• Hydrodynamic generator which produces sufficient
energy to ignite and control the heater.
• Gauge to display temperature, burner operation and
malfunctions
4
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1.6 Dimensions
Technical Characteristics and Dimensions
Fig. 1
4 Heat exchanger
5 Burner
10 Temperature/volume selector
20 Gas connection
23 Ignition unit
26 Power selector
34 LED - Burner status check
Dimensions
(mm)
A B C D E F G
35 Switch/LED - Low water pressure indicator
36 Front cover
37 Opening for mounting on the wall
38 Connection collar to the combustion gases pipe
39 Flue with non-return device
40 Gas valve
42 Digital display
H (Ø)
Natural gas LPG
WRD11G 310 580 228 112,5 463 60 25 3/4” 1/2”
WRD14G 350 655 228 132,5 510 95 30 3/4” 1/2”
WRD18G 425 655 334 132,5 540 65 30 3/4” 1/2”
Tab. 3 Dimensions
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5
Technical Characteristics and Dimensions
1.7 Functional diagram of the heater
Fig. 2 Functional diagram
1 Pilot burner
2 Spark plug
3 Ionisation probe
4 Heat exchanger
5 Main burner
6 Injector
7a Screw for measurement of pressure in burner
7b Screw for measurement of input pressure
8 Slow ignition valve
9 Venturi
10 Temperature/volume selector
11 Water valve
12 Command cone
13 Water flow regulator
14 Water filter
16 Cold water pipe
17 Diaphragm
18 Main gas valve
19 Maximum gas adjusting screw
6
20 Gas supply pipe
21 Gas filter
22 Hot water pipe
23 Ignition unit
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
41 Temperature sensor
50 Hydrogenerator
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1.8 Electrical diagram
Technical Characteristics and Dimensions
Fig. 3 Electrical diagram
2 Spark plug
3 Ionisation probe
23 Ignition unit
25 Servo valve (normally open)
28 Pilot valve (normally closed)
31 Temperature limiter
32 Flue gas safety device
1.9 Function
This gas heater is equipped with automatic electronic
ignition which simplifies its operation.
B To do so, just turn on the switch (Fig. 7).
After this procedure, automatic ignition occurs
whenever 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
conventional systems which operate permanently.
Air in the gas supply pipe when the heater
is started up may cause ignition to fail.
i
33 Diaphragm valve
34 LED - Burner status check
35 Switch/LED - Low water pressure indicator
41 Temperature sensor
42 Digital display
50 Hydrogenerator
If this happens:
B Close and open the hot water tap to repeat the
ignition process until all the air has been purged.
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Technical Characteristics and Dimensions
1.10 Technical characteristics
Technical characteristics Symbol Units WRD11 WRD14 WRD18
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 9 - 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 m
3
/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 pw
min
bar 0,35 0,35 0,45
Minimum pressure for maximum flow bar 0,55 0,65 0,8
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 0,45 0,45 0,45
Minimum pressure for maximum flow bar 1 1,4 1,7
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
8
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Regulations
2Regulations
Any local by-laws and regulations pertaining to
installation and use of gas-heated appliances must be
observed. Please refer to the laws that should be
attended in your country.
3 Installation
The gas installation, the connection of
exhaust/supply pipes as well as the initial
i
startup are to be performed exclusively by
authorised gas fitters.
The heater can only be used in the
countries indicated on the rating plate.
i
The use of these heaters with water
supply pressure values below 0.5 bar is
i
not recommended.
3.1 Important information
• To avoid corrosion, the combustion air must be free
from harmful substances. Examples of particularly
corrosive substances: halogenated hydrocarbons
contained in solvents, paints, glues, engine gases
and various domestic detergents. If necessary, take
adequate measures.
• Respect the minimum installation clearances
indicated 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:
B Turn off the heater.
B Purge the heater (see section 6.3).
B Before installing, call the gas company and check the
standard relating to gas heaters and ventilation
requirements for rooms.
B Install a gas cut-off valve as close as possible to the
heater.
B After finishing the gas system, the pipes must be
thoroughly 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.
B Check if the heater corresponds to the type of gas
provided.
B Check if the flow and pressure through the installed
reducer are appropriate for the consumption of the
heater (see technical data in the table 4).
3.2 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 m
furniture providing this does not exceed 2 m
• Comply with the specific instructions for each
country.
• 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.
3
(not including the volume of the
3
.
Fig. 4 Minimum clearances
Combustion gases
• All gas heaters must be connected in a leak-roof
manner to a gas evacuation pipe of adequate
dimensions.
• The flue must:
– be vertical (reduced horizontal sections or no
horizontal 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.
• Must be mounted a protection wind/rain in the
extremity of the evacuation pipe.
Caution: Ensure that the extremity of
the evacuation pipe is placed between
the ledge and the ring of the flue.
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Installation
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.
Heater Minimum useful area
WRD11G ≥60 cm
WRD14G ≥90 cm
WRD18G ≥120 cm
Tab. 5 Useful areas for air intake
The minimum requirements are listed above; however,
each country's specified requirements must also be
respected.
2
2
2
B Connect the water pipes to the water valve using the
provided connection accessories.
Fig. 5 Water connection
3.3 Heater mounting
B Remove the temperature/flow selector and the
power selector.
B Unscrew the front fixing screws.
B With a simultaneous movement towards you and
upwards, release the front of the two lugs from the
back.
B Fix the heater vertically, using the provided screw
hooks and plugs.
Caution: Never support the gas heater
on the water or gas connections.
3.4 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.
B Identify the cold water pipe (Fig. 5, item A) and the
hot water pipe (Fig. 5, item B), so as to avoid any
possible mis-connection.
It is advisable to install a non-return valve
on the supply side of the heater to avoid
i
problems caused by sudden changes in
supply pressure.
3.5 Hydrogenerator operation
The hydrogenerator (hydrodynamic generator) is
inserted in the water circuit between the water valve
and the heat exchanger. This component has a turbine
that rotates when water flows past its blades. This
movement is transmitted to an electric generator which
powers the heater ignition unit.
The electrical voltage value supplied by the HDG is
between 1.1 and 1.7 VDC. In this way, there is no need
for batteries.
3.6 Gas connection
Any local by-laws and regulations pertaining to
installation and use of gas-heated appliances must be
observed.
Please refer to the laws that should be attended in your
country.
10
3.7 Commissioning
B Turn on the gas and water cocks and check all
connections for leaks.
B Check flue gas safety device good functioning,
proceed as explained in section 6.4.
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4Use
Use
Open all water and gas blocking devices.
Purge the pipes.
i
Caution: The front panel in the burner
and pilot burner area may reach high
temperatures, with risk of burning in
case of contact.
4.1 Digital display - description
Fig. 6 Digital display
1 Temperature/error code
2 Malfunction indicator
3 Temperature measurement units
4 Heater in operation (burner turned on)
4.3 Turning the heater on and off
Turning on
B Press the switch , position .
Fig. 7
Green light on = Main burner on
4.2 Before starting up the heater
Caution:
B Initial startup must be performed by a
qualified technician who will provide the
client with all the necessary information
for optimum operation of the gas heater.
B Check if the gas indicated on the rating plate is the
same as the one used at the location.
B Open the gas valve.
B Open the water valve.
Fig. 8
Turning off
B Press the switch , position .
4.4 Water flow
If the red LED starts flashing, check the water pressure.
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Fig. 9
11
Use
4.5 Power adjustment
Lower water temperature.
Less power.
Fig. 10
Higher water temperature.
More power.
Fig. 11
4.6 Temperature/flow adjustment
B Turn anti-clockwise
Increases flow and decreases water temperature.
Fig. 12
B Turn clockwise.
Decreases flow and increases water temperature.
Regulating the temperature to the minimum required
value reduces energy consumption as well as the
possibility of limescale deposits in the heat exchanger.
12
Caution: The temperature on the
display is not precise, always check
before bathing children or elderly
people.
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5 Adjustments
Adjustments
5.1 Heater adjustment
Sealed elements must not be opened.
i
Natural gas
Heaters for natural gas (G 20) are supplied sealed from
the factory after being adjusted to the values indicated
on the rating plate.
Heaters must not be turned on if the
connection pressure is lower than 15
i
mbar or higher than 25 mbar.
Liquefied gas
Heaters for propane/butane (G31/G30) are supplied
sealed from the factory after being adjusted to the
values indicated on the rating plate.
Danger: The following procedures
must only be performed by a qualified
technician.
It is possible to adjust the power using the burner
pressure process, although a manometer is necessary
for this procedure.
Maximum gas flow adjustment
B Remove the seal from the adjusting screw (Fig. 14).
B Turn on the heater with the power selector set to the
left (maximum position).
Fig. 14 Maximum gas flow adjusting screw
B Open various hot water taps.
B Using the adjusting screw (Fig. 14), regulate the
pressure until achieving the values indicated in the
table 6.
B Seal the adjusting screw once again.
5.2 Pressure adjustment
Accessing the adjusting screw
B Remove the front part of the heater (see 3.3).
Connecting the manometer
B Unscrew the shut-off screws (Fig. 13).
B Connect the manometer to the burner pressure
measuring point.
Fig. 13 Pressure measurement point
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Adjustments
Minimum gas flow adjustment
The minimum gas flow adjustment is
performed automatically after the
i
adjustment of the maximum gas flow.
Natural gas H Butane Propane
Injector code
Connection
pressure
(mbar)
MAX (mbar)
8708202113
(1,10)
WR11
8708202124
(1,20)
8708202113
(1,10)
WR14
8708202116
(1,25)
8708202115
(1,15)
WR18
8708202116
(1,25)
WR11
WR14
WR18
WR11 12,7 28 35
WR14 12 28 35
WR18 10,3 25,5 32,5
20 30 37
8708202130
(0,70)
8708202128
(0,72)
8708202128
(0,72)
8708202132
(0,75)
8708202130
(0,70)
8708202132
(0,75)
Tab. 6 Burner pressure
5.3 Conversion to a different type of
gas
Only use the original conversion kits.
The conversion must only be performed by a qualified
technician. The original conversion kits are supplied
with assembly instructions.
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6 Maintenance
Maintenance
Maintenance must only be performed by a
qualified technician. After one or two
i
years of use a general overhaul must be
performed.
Warning: Before performing any
maintenance work:
B Close the water flow valve.
B Close the gas flow valve.
B Only use original spare parts.
B Order the spare parts according to the spare parts
catalogue for the heater.
B Replace the joints and removed O-rings with new
ones.
B Only the following lubricants must be used:
– Hydraulic part: Unisilikon L 641 (8 709 918 413)
– Coil unions: HFt 1 v 5 (8 709 918 010).
6.1 Periodic maintenance work
Functional check
Warning: Without a water filter
installed, turning on the heater is
prohibited.
6.2 Startup after maintenance work
B Tighten all connections once more.
B Read chapter 4 “Use” and chapter 5 “Adjustments”.
6.3 Purge the appliance
IIf there is a risk of freezing, proceed as follows:
B Remove the fixing lock from the filter screw cap (no.
1) situated in the water valve.
B Remove the filter screw cap (no. 2) from the water
valve.
B Empty all the water contained in the heater.
B Check the operation of all safety, adjustment and
monitoring elements.
Heat exchanger
B Check the heat exchanger is clean.
B In case of dirt:
– Remove the heat exchanger and take out the
limiter.
– Clean the chamber with a powerful jet of water.
B If dirt persists: Soak the plates in hot water with
detergent and clean thoroughly.
B If necessary: De-lime the interior of the heat
exchanger and the connection pipes.
B Install the heat exchanger using new joints.
B Install the limiter on the support.
Burner
B Check the burner annually and clean it if necessary.
B If it is very dirty (grease, soot): Remove the burner,
soak it in hot water with detergent and clean it
thoroughly.
Water filter
B Replace the water filter installed in the water valve
entry.
Burner and pilot injector
B Remove and clean the pilot burner.
B Remove and clean the pilot injector.
Fig. 15 Purging
1 Lock
2 Filter screw cap
6.4 Flue gas safety device
Danger: The probe must never be
turned off, modified or replaced with a
different part under any circumstances.
Operation and precautions
This probe verifies the conditions of flue evacuation
and, in case of malfunction, it automatically turns off the
heater. This prevents the combustion gases from
entering the room where the gas heater has been
installed. The probe restarts after a reset period.
If the heater turns off during operation:
B Ventilate the room.
B 10 minutes later, turn on the heater once again.
Call a qualified technician if the same thing happens
again.
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15
Maintenance
Danger: The user must never touch the
device.
Maintenance*
If the probe malfunctions, proceed in the following
manner:
B Unscrew the probe fixing screw.
B Detach the ignition unit terminal.
B Replace the damaged part and proceed with its
assembly using the steps indicated in the previous
table, in reverse order.
Operating check*
To check the correct operation of the combustion gas
probe, proceed in the following manner:
B Remove the combustion gases evacuation pipe.
B Replace it with a pipe (approximately 50 cm long)
blocked at one end.
B The pipe must be routed vertically.
B Turn on the heater at nominal power and with the
temperature selector adjusted to maximum
temperature.
In these conditions, the heater must turn off two
minutes afterwards, at most. Remove the pipe and
replace the evacuation pipe.
* These procedures must be performed by a qualified
installer.
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Problems
7Problems
7.1 Problem/cause/solution
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart offers
solutions to possible problems (solutions followed by an * must be undertaken by qualified technicians only).
Problem Cause Solution
The heater does not ignite and
digital display is turned off.
Slow and difficult ignition of
the burner.
Red LED in switch flashes.
Water at low temperature. Check the temperature selector position
Water is not heated, no flame. Insufficient gas supply. Check reducer, and if inadequate or
The burner turns off the heater
is operating.
Switch turned off.
Reduced water flow.
Reduced water flow.
Temperature limiter has tripped
(digital display shows “E9”).
Flue gas safety device has tripped
(digital display shows “A4”).
Check switch position.
Check and correct.
Check and correct.
and adjust it according to the desired
water temperature.
malfunctioning, replace it.
Check if the bottles (butane) freeze
during operation, and if so, move them
to a warmer place.
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 technician.
Incorrect temperature information in the appliance digital
display.
Digital display shows “E1”. Water temperature sensor has
Digital display shows “A7”. Temperature sensor incorrectly
Blocked heater. Digital display shows “F7” or “E0”. Turn the heater off and on, if the
There is spark but the main
burner does not ignite, heater
blocked.
Tab. 7
Insuficient contact of the
temperature sensor.
tripped (outlet water temperature
above 85 °C).
connected.
Temperature sensor defective.
No ionisation probe signal (digital
display shows “EA”).
Check and correct the temperature
sensor assembling.
Reduce the water temperature using the
power and/or temperature adjustment
selector. If the problem persists, call a
qualified technician.
Check and correct connection.
Replace the temperature sensor.
problem persists, call a qualified
technician.
Check:
• Gas supply.
• Ignition system (ionisation electrode
and electrovalves).
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Problems
Problem Cause Solution
Blocked heater, digital display
shows “F0”.
Power was activated with a hot
water tap running.
Reduced water flow. Insufficient water supply pressure.
Dirty taps or mixers.
Gas valve blocked.
Heat exchanger blocked
(limescale).
Tab. 7
Turn the water off and on. If the problem
persists, call a qualified technician.
Check and correct. *
Check and clean.
Clean filter.*
Clean and de-lime if necessary.*
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Problems
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