Junkers WRD 14-2 G31, WRD 11-2 G23, WRD 14-2 G23, WRD 18-2 G31, WRD 18-2 G23 User Manual
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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
6 720 607 WRDG
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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3
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
6 720 607 WRDG
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