Bosch WR11B series Technical Document

Installation Manual and Operating Instructions

Gas Instantaneous Water Heater

WR 11/14/18 .B..

6 720 648 592 (2011/06) ZA

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!

2| Table of contents

6 720 648 592 (2011/06)

Table of contents

1 Key to symbols and safety instructions 3

1.1 Explanation of symbols 3

1.2 Safety Instructions 3

2 Technical Characteristics and Dimensions 5

2.1 Declaration of conformity with relevant EEC

regulations 5

2.2 Explanation of Model Code 5

2.3 Accessories (Included with Appliance) 5

2.4 Description of the heater 5

2.5 Explanation of model code 5

2.6 Special accessories 6

2.7 Dimensions 6

2.8 Functional diagram of the heater 7

2.9 Electrical diagram 8

2.10 Function 8

2.11 Technical characteristics 9

3Use 10

3.1 Before starting up the heater 10

3.2 Batteries 10

3.3 Turning the heater on and off 10

3.4 Power adjustment 11

3.5 Temperature/flow adjustment 11

3.6 Purge the appliance 11

3.7 Cleaning 11

4Regulation 12

5 Installation (must be carried out only by

qualified technicians) 13

5.1 Important information 13

5.2 Selection of the place of installation 13

5.3 Heater mounting 14

5.4 Water connection 14

5.5 Gas connection 14

5.6 Inlet/exhaust pipe installation 15

5.7 Startup 15

6 Adjustments (must be carried out only by

qualified technicians) 16

6.1 Factory regulations 16

6.2 Pressure adjustment 16

6.3 Conversion to a different type of gas 17

7 Maintenance (must be carried out only by

qualified technicians) 18

7.1 Periodic maintenance work 18

7.2 Startup after maintenance work 18

7.3 Flue gas safety device 18

8Problems 20

9 Environment / disposal 21

Key to symbols and safety instructions | 3

6 720 648 592 (2011/06)

1 Key to symbols and safety instructions

1.1 Explanation of symbols

Warnings

Keywords indicate the seriousness of the hazard in

terms of the consequences of not following the safety

instructions.

•NOTE indicates that material damage may occur.

•CAUTION indicates that minor to medium injury may

occur.

•WARNING indicates that serious injury may occur.

•DANGER indicates possible risk to life.

Important information

Additional symbols

1.2 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.

Burn-back (fire in burner tube or chamber)

BIn the event of a burn-back, where the flame burns

back to the injector, immediately turn off the gas

supply at the control valve on the panel.

BAfter ensuring the flame is extinguished, wait for one

minute and re-light the appliance in the normal

manner.

BShould the appliance again burn back, close the

control valve and call a service technician.

BDo not use the appliance again until the service

technician has declared that it is safe to do so.

Fitting, modifications

BThe fitting and modification of the installation of the

appliance must be carried out only by an authorized

technician.

BThe installation of the water heater may only be

carried out by a registered installer and that such

installations shall comply with the requirements of

SANS 10087-1.

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

environmental compatibility of the installation.

BThe appliance should be serviced annually.

BOnly original spare parts must be used.

Warnings in this document are framed and

identified by a warning triangle which is

printed on a grey background.

Electrical hazards are identified by a

lightning symbol surrounded by a warning

triangle.

Important information in cases where there

is no risk of injury or material losses is

identified by the symbol shown on the left.

It is bordered by horizontal lines above and

below the text.

Symbol Meaning

Ba step in an action sequence

Æa reference to a related part in the

document or to other related documents

•alistentry

– a list entry (second level)

Table 1

4| Key to symbols and safety instructions

6 720 648 592 (2011/06)

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).

Important information for the user

BThis appliance may only be installed by a registered

LP Gas installer.

BAll registered installers are issued with a card carrying

their registration number.

BAsk to be shown the card before allowing the

installation work to commence and make a note of the

Installer QCC number. Upon completion of the

installation, the installer is required to explain the

operational details of the appliance together with the

safety instructions. You will be asked to sign

acceptance of the installation and be provided with a

completion certificate. You should only sign for

acceptance of the installation when the installation is

completed to your satisfaction.

BNote that your invoice is required in the event that you

wish make a guarantee claim.

Important information for the installer

BThis appliance may only be installed by a LP gas

installer registered with the Liquefied Petroleum Gas

Association of Southern Africa.

BThe appliance must be installed in accordance with

the requirements of SANS 10087-1 and any fire

department regulations and/or local by laws

applicable to the area. If in doubt check with the

relevant authority before undertaking the installation.

BUpon completion of the installation you are required

to fully explain and demonstrate to the user the

operational details and safety practices applicable to

the appliance and the installation.

Client information

BInform the client about the function and operation of

the appliance.

BCaution clients against performing modifications or

repairs themselves.

Risk of damage due to operator error

Operator errors can result in injury and damage to

property.

BEnsure that children never operate this appliance

unsupervised or play with it.

BEnsure that only personnel who can operate this

appliance correctly have access to it.

Technical Characteristics and Dimensions | 5

6 720 648 592 (2011/06)

2 Technical Characteristics and Dimensions

2.1 Declaration of conformity with

relevant EEC regulations

This appliance fulfills European directive requirements

2009/142/EC, 2006/95/EC, 2004/108/EC and

corresponds to the specifications described in the

corresponding EEC certificate of proof.

2.2 Explanation of Model Code

WGas Water Heater

RProportional power adjustment

11 Capacity (l/min)

BElectronic ignition powered by 1.5 V batteries

23 Indicator number of natural gas H

31 Indicator number of LPG

S... Country code

The code number indicates the gas group according to

EN 437:

2.3 Accessories (Included with Appliance)

•Gaswaterheater,

• Attachment elements,

• Installation accessories,

• Two 1.5 V batteries type R

•Heaterdocumentation.

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

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 in copper 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.

•Safetydevices:

– 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.

2.5 Explanation of model code

The type plate is located at the bottom left of the

appliance.

There you will find details of appliance output, model

number, approval data and the serial number.

Model WR 11/14/18 B...

Category II2H3+

Type Type B

Table 2

WR11 B 23

S....

WR14 B 23

S....

WR18 B 23

S....

Table 3

Identification

Code

Wobbe Index

(Ws) (15 °C) Gas type

23 12,7-15,2

kWh/m3

Natural Gas -

Group H

31 20,2-21,3

kWh/m3LPG - Group B/P

Table 4

6| Technical Characteristics and Dimensions

6 720 648 592 (2011/06)

2.6 Special accessories

• Conversion kit from natural gas to butane/propane.

2.7 Dimensions

Fig. 1

1Front cover

2Hole for fixing to wall

3Temperature control

4Led indicator for battery charge level

5ON/OFF switch

6Led indicator for burner status

7Output control

8Gas connection

9Flue socket

10 Draught diverter with flue gas monitor

11 Heat exchanger

12 Automatic gas valve

13 Igniter unit

14 Battery compartment

Dimensions

(mm) A B C D E F G

H (Ø)

Natural

gas LPG

WR11B 310 580 228 112,5 463 60 25 1/2” 1/2”

WR14B 350 655 228 132,5 510 95 30 1/2” 1/2”

WR18B 425 655 334 132,5 540 65 30 1/2” 1/2”

Table 5 Dimensions

Technical Characteristics and Dimensions | 7

6 720 648 592 (2011/06)

2.8 Functional diagram of the heater

Fig. 2 Functional diagram

1Pilot burner

2Igniter electrode

3Ionisation detector

4Heat exchanger

5Main burner

6Injector

7a Testing point for burner pressure

7b Testing point for supply pressure

8Venturi

9Temperature/volume selector

10 Water valve

11 Adjusting screw for min. water flow rate

12 Water flow regulator

13 Water filter

14 Cold water supply pipe

15 Diaphragm

16 Microswitch

17 Main gas valve

18 Regulating screw

19 Gas inlet

20 Gas filter

21 Battery compartment

22 Hot water pipe

23 Igniter unit

24 Led indicator for burner status

25 ON/OFF switch

26 Led indicator for battery charge level

27 Servo valve

28 Output control

29 Gas valve

30 Gas valve for pilot burner

31 Pilot burner injector

32 Gas pipe for pilot burner

33 Temperature limiter

34 Flue gas safety device

8| Technical Characteristics and Dimensions

6 720 648 592 (2011/06)

2.9 Electrical diagram

Fig. 3 Electrical diagram

1Servo valve (normally open)

2Diaphragm valve

3Main valve (normally closed)

4Ionisation detector

5Igniter electrode

6Flue gas safety device

7Temperature limiter

8Igniter unit

9LED indicator for battery charge level

10 LED indicator for burner status

11 ON/OFF switch

12 Batteries, 1.5V

13 Microswitch

2.10 Function

This gas heater is equipped with automatic electronic

ignition which simplifies its operation.

BTo do so, just turn on the switch (ÆFig. 6).

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.

If this happens:

BClose and open the hot water tap to repeat the

ignition 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.

Technical Characteristics and Dimensions | 9

6 720 648 592 (2011/06)

2.11 Technical characteristics

Technical characteristics Symbol Units WR11 WR14 WR18

Power and flow

Nominal useful power Pn Btu/h 65570 80595 104165

Minimum useful power Pmin Btu/h 23905 23905 23905

Useful power (adjustment range) Btu/h 23905-65570 23905 - 80595 23905 - 104165

Nominal thermal flow Qn Btu/h 74450 92210 117825

Minimum thermal flow Qmin Btu/h 27660 27660 27660

Gas data1)

1) Hi 15 °C - 1013 mbar - dry: Natural gas 34.02 MJ/m3(9.5 kWh/m3)

LPG: Butane 45.65 MJ/kg (12.7 kWh/kg) - Propane 46.34 MJ/kg (12.9 kWh/kg)

Supply pressure

Natural gas H G20 kPa 2 22

LPG (Butane/Propane) G30 kPa 2,8 2,8 2,8

Consumption

Natural gas H G20 m3/h 2,2 2,77 3,5

LPG (Butane/Propane) G30 Kg/h 1,75 2,2 2,79

Number of injectors 12 14 18

Water data

Maximum permissible pressure2)

2) Considering the water dilution effect this value must not be exceeded.

pw psi 170 170 170

Temperature selector in fully clockwise position

Temperature rise °C 50 50 50

Flow range l/min 2 - 5,5 2,0 - 7 2,0 - 8,8

Minimum operating pressure pwmin psi 1,5 1,5 3,0

Minimum pressure for maximum water

flow psi 3,6 5,0 7,2

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 pressure for maximum water

flow psi 8,7 14,5 19

Combustion products3)

3) For nominal calorific power.

Minimum low pressure mbar 0,015 0,015 0,015

Flow g/s 13 17 22

Temperature °C 160 170 180

Table 6

10 | Use

6 720 648 592 (2011/06)

3Use

3.1 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.

3.2 Batteries

Battery insertion

BInsert the two 1.5 V R20 batteries.

Fig. 4 Inserting the batteries

Replacing the batteries

The batteries must be changed if the red LED starts

flashing.

Fig. 5 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.

3.3 Turning the heater on and off

Turning on

BPress the switch , position .

Fig. 6

Green light on = Main burner on

Fig. 7

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 information

for optimum operation of the gas heater.

6720680412-01.1av

6720680412-02.1av

6720680412-03.1av

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