Bosch GWH 10-2 G.., GWH 13-2 G.., GWH 16-2 G.. User Manual

Gas Heaters

GWH 10-2 G.. / GWH 13-2 G.. / GWH 16-2 G..

en Installation Manual and Operating Instructions

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!

6 720 608 992 (2011/12) AU

2 | Table of contents

Table of contents

1 Key to symbols and safety instructions . . . . . . . 3

1.1 Explanation of symbols . . . . . . . . . . . . . . . . 3

1.2 Safety information . . . . . . . . . . . . . . . . . . . 3

2 Technical Characteristics and Dimensions . . . . . 4

2.1 General Description . . . . . . . . . . . . . . . . . . 4

2.2 Explanation of Model Code . . . . . . . . . . . . . 4

2.3 Package contents . . . . . . . . . . . . . . . . . . . . 4

2.4 Description of the heater . . . . . . . . . . . . . . 4

2.5 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.6 Functional diagram of the heater . . . . . . . . 6

2.7 Electrical diagram . . . . . . . . . . . . . . . . . . . . 7

2.8 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.9 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 Hydrogenerator operation . . . . . . . . . . . . 11

4.6 Pressure Relief . . . . . . . . . . . . . . . . . . . . . 12

4.7 Gas connection . . . . . . . . . . . . . . . . . . . . . 12

4.8 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

10 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . 20

11 Warranty details . . . . . . . . . . . . . . . . . . . . . . . . 21

5 Operating instructions . . . . . . . . . . . . . . . . . . . . 13

5.1 Digital display - description . . . . . . . . . . . 13

5.2 Before starting up the heater . . . . . . . . . . 13

5.3 Turning the heater on and off . . . . . . . . . . 13

5.4 Water flow . . . . . . . . . . . . . . . . . . . . . . . . 13

5.5 Gas adjustment . . . . . . . . . . . . . . . . . . . . . 14

5.6 Temperature/flow adjustment . . . . . . . . . 14

5.7 Draining the appliance . . . . . . . . . . . . . . . 14

6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1 Inlet pressure adjustment . . . . . . . . . . . . . 15

6.2 Burner pressure adjustment . . . . . . . . . . . 15

6.3 Conversion to a different type of gas . . . . 15

7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1 Flue gas safety device . . . . . . . . . . . . . . . . 16

8 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.1 Problem/cause/solution . . . . . . . . . . . . . . 17

9 Environmental protection . . . . . . . . . . . . . . . . . 19

6 720 608 992 (2011/12)

1 Key to symbols and safety instructions

If you smell combustion gases:

1.1 Explanation of symbols

Warnings

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.

Keywords indicate the seriousness of the hazard in terms of the consequences of not following the safety instructions.

• NOTICE 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

Important information in cases where there is no risk of personal injury or material losses is identified by the symbol shown on the left. It is bordered by horizontal lines above and below the text.

Additional symbols

Symbol Meaning

B a step in an action sequence

Æ a reference to a related part in the

document or to other related documents

• a list entry

– a list entry (second level)

Table 1

1.2 Safety information

If you smell gas:

B Close the gas supply valve. B Open the windows. B Do not operate any electrical appliances or switches

(on/off).

B Extinguish other sources of ignition. B Go to a different location and call the gas supplier or

an authorised technician.

B Turn off the heater. B Open doors and windows. B Notify an authorised technician.

Assembly, modifications

B The assembly and modifications to 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.

Maintenance

B We recommend the system be serviced regularly to

ensure it functions reliably and safely.

B The installer is responsible for the safety and

environmental compatibility of the installation.

B The heater should be serviced annually. B Only original spare parts must 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).

B Do not spray pressure pack or use chemicals around

the heater

Information to the customer

B Inform the customer about how to operate the heater. B This appliance is not intended for use by persons

(including children) with reduced physical sensory or mental capabilities. Children should be supervised to ensure they do not play with the appliance.

B Caution customers against performing modifications

or repairs themselves.

To be installed and serviced only by an authorised person

The “authorised installing person” is responsible for:

B Correct commissioning of this appliance. B Ensuring the appliance performs to the specifications

stated on the rating label.

B Demonstrating the operation of the appliance to the

customer before leaving.

B Handing these instructions to customer.

THIS APPLIANCE IS NOT FOR USE AS A POOL OR SPA POOL HEATER. THIS APPLIANCE IS ONLY TO BE INSTALLED INDOORS.

Key to symbols and safety instructions | 3

6 720 608 992 (2011/12)

4 | Technical Characteristics and Dimensions

2 Technical Characteristics and Dimensions

• Gas flow adjustment proportional to the water flow to

2.1 General Description

Model GWH 10/13/16 -2 G..

Category CONTINUOUS FLOW

Type INTERNAL

Table 2

2.2 Explanation of Model Code

Type l/min Series Ignition Gas Types

GWH 10 2GNG / LP gas

GWH 13 2GNG / LP gas

maintain a constant temperature.

• Safety devices:

– Ionisation probe to check for accidental extinction

of the burner flame

– Flue gas safety device which turns off the heater in

cases where the evacuation of flue gases is inadequate

– Overtemperature switch which prevents

overheating of the heat exchanger.

GWH 16 2GNG / LP gas

Table 3

2.3 Package contents

• Gas heater

• Fixing Brackets

• flexible water pipes

• Gas regulator

• Heater documentation

2.4 Description of the heater

Designed for convenience, 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 produces sufficient energy to ignite and control the heater.

• Gauge to display temperature, burner operation and error codes

• Temperature sensor to monitor the water temperature at the heater outlet

• Available in Natural gas or LP gas

• Temporary pilot burner which only functions during

the period between the opening of the water valve and the ignition of the main burner

• Water valve made of fibreglass-reinforced polyamide, and is 100% recyclable

• Automatic control of the water flow to allow for variable water supply pressure.

6 720 608 992 (2011/12)

2.5 Dimensions

Technical Characteristics and Dimensions | 5

Fig. 1

1 Front cover 2 Opening in rear panel for mounting on the wall 3 Temperature/volume selector 4 Gas adjustment 5 Digital display 6 Switch/LED - Low water pressure indicator 7 LED - Burner status check

Dimensions (mm)

A B C D E F G

8 Gas connection 9 Connection collar for flue 10 Draught diverter 11 Copper Heat exchanger 12 Burner 13 Gas valve 14 Ignition unit

H (Ø)

Natural gas LP gas

GWH10... 310 580 228 115 463 60 25 20 15

GWH13... 350 655 228 140 510 95 30 20 15

GWH16... 425 655 334 140 540 65 30 20 15

Table 4 Dimensions

6 720 608 992 (2011/12)

6 | Technical Characteristics and Dimensions

2.6 Functional diagram of the heater

28 27

Fig. 2 Functional diagram

1 Pilot burner 2 Ignition Electrode 3 Ionisation probe 4 Heat exchanger 5 Main burner 6 Injector 7a Burner pressure test point 7b Gas inlet pressure test point 8 Slow ignition valve 9 Venturi 10 Temperature/volume selector 11 Water valve 12 Plunger 13 Water flow regulator 14 Water filter 15 Hydrogenerator 16 Cold water pipe

171819207b21

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 Temperature sensor 25 Servo valve 26 Power selector 27 Gas valve 28 Pilot valve 29 Pilot injector 30 Pilot gas pipe 31 Overtemperature switch 32 Flue gas safety device 33 Relief Valve/Drain screw

6720608992-05.1V

6 720 608 992 (2011/12)

2.7 Electrical diagram

Technical Characteristics and Dimensions | 7

Fig. 3 Electrical diagram

1 Ignition electrode 2 Ignition unit 3 Switch/LED - Low water pressure indicator 4 Digital display 5 Ionisation probe 6 Flue gas safety device 7 Overtemperature switch

2.8 Function

This gas heater is equipped with automatic electronic ignition to simplify operation.

B To activate, just turn on the switch (Fig. 8).

After this, automatic ignition occurs whenever a hot water tap is opened. First, the pilot burner is lit and approximately four seconds later the main burner ignites. The pilot burner flame is extinguished after the main burner lights. 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.

8 Temperature sensor 9 Pilot solenoid (Normally Closed) 10 Diaphragm valve 11 Main Solenoid (Normally Open) 12 Hydrogenerator 13 LED - Burner status check

6 720 608 992 (2011/12)

8 | Technical Characteristics and Dimensions

2.9 Technical characteristics

Technical characteristics Units GWH10 GWH13 GWH16

Gas Consumption

Nominal Gas Consumption MJ 79

Supply pressure

Natural gas H kPa 1.13 1.13 1.13

LP gas kPa 2.75 2.75 2.75

Number of injectors 12 14 18

Water data

Maximum permissible pressure kPa 1000 1000 1000

Temperature selector in fully clockwise position

Temperature rise °C 50 50 50

Flow range l/min 2.2 - 4.6 2.2 - 6.2 2.2 - 8.6

Minimum operating pressure kPa 35 35 50

Minimum pressure for maximum flow kPa 50 60 80

Temperature selector in fully anti-clockwise position

Temperature rise °C 25 25 25

Flow range l/min 4 - 10 4 - 13 4 - 15

100 (NG)

127

97 (LP gas)

Minimum operating pressure kPa 45 45 50

Minimum pressure for maximum flow kPa 100 140 170

Table 5

6 720 608 992 (2011/12)

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