Bosch GWH 10-2 G Series Technisches Dokument

Installation Manual and Operating Instructions

Gas Water Heaters

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

6 720 608 992 (2021/02) AU

Table of contents

6 720 608 992 (2021/02)

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 . . . . . . . 5

2.1 General Description . . . . . . . . . . . . . . . . . . . 5

2.2 Explanation of Model Code . . . . . . . . . . . . . . 5

2.3 Package contents . . . . . . . . . . . . . . . . . . . . . 5

2.4 Description of the heater . . . . . . . . . . . . . . . 5

2.5 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.6 Functional diagram of the heater . . . . . . . . . 7

2.7 Electrical diagram . . . . . . . . . . . . . . . . . . . . . 8

2.8 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.9 Technical characteristics . . . . . . . . . . . . . . . 9

3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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 . . . . . . . . . . . . . . . . . . . . . . 11

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

4.8 Flue connection . . . . . . . . . . . . . . . . . . . . . . 12

4.9 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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 . . . . . . . . . . . . . . . . 15

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

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

6.2 Burner pressure adjustment . . . . . . . . . . . . 16

6.3 Conversion to a different type of gas . . . . . 16

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

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

8 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.1 Problem/cause/solution . . . . . . . . . . . . . . . 18

9 Environmental protection . . . . . . . . . . . . . . . . . . . . 20

10 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

11 Warranty details . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Key to symbols and safety instructions

6 720 608 992 (2021/02)

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.

•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

Additional symbols

1.2 Safety information

If you smell gas:

▶ Close the gas supply valve.

▶ Open the windows.

▶ Do not operate any electrical

appliances or switches (on/off).

▶ Extinguish other sources of ignition.

▶ Go to a different location and call the

gas supplier or an authorised

technician.

If you smell combustion gases:

▶ Turn off the heater.

▶ Open doors and windows.

▶ Notify an authorised technician.

Assembly, modifications

▶ The assembly and modifications to

the heater can only be performed by

an authorised installer.

▶ Do not modify the pipes which

conduct combustion gases.

▶ Do not close or reduce air circulation

vents.

Maintenance

▶ We recommend the system be

serviced regularly to ensure it

functions reliably and safely.

▶ The installer is responsible for the

safety and environmental

compatibility of the installation.

▶ The heater should be serviced

annually.

▶ Only original spare parts must be

used.

Explosive and highly inflammable

material

▶ Do not use or store flammable

materials in or near this appliance.

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 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.

Symbol Meaning

▶ a step in an action sequence

a reference to a related part in the document or

to other related documents

• a list entry

–a list entry (second level)

Table 1

Key to symbols and safety instructions

6 720 608 992 (2021/02)

Combustion air and surrounding air

▶ 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).

▶ Do not spray aerosols in the vicinity of

this appliance while it is in operation.

Information to the customer

▶ Inform the customer about how to

operate the heater.

▶ 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.

▶ Caution customers against

performing modifications or repairs

themselves.

Tobeinstalledandservicedonlybyan

authorised person

The “authorised installing person” is

responsible for:

▶ Correct commissioning of this

appliance.

▶ Ensuring the appliance performs to

the specifications stated on the rating

label.

▶ Demonstrating the operation of the

appliance to the customer before

leaving.

▶ Handing these instructions to

customer.

▶ Flue and ventilation guidelines must

be followed.

THIS APPLIANCE IS NOT FOR USE AS A

POOL OR SPA POOL HEATER.THIS

APPLIANCE IS ONLY TO BE INSTALLED

INDOORS.

Do not modify this appliance.

Equipped with a flue gas safety device.

Not suitable for commercial

recirculating systems.

WARNING:

This appliance may deliver

water at high temperature.

Refer to the Plumbing Code pf

Australia (PCA), local

requirements and installation

instructions to determine if

additional delivery

temperature control is

required.

Technical Characteristics and Dimensions

6 720 608 992 (2021/02)

2 Technical Characteristics and

Dimensions

2.1 General Description

The appliance has been AS/NZS 5263.1.2 tested.

2.2 Explanation of Model Code

2.3 Package contents

•Gasheater

• Fixing Brackets

• Flexible water pipes

• Gas regulator

• Fluing guidelines

•Heaterdocumentation

2.4 Description of the heater

Hot water unit for internal wall mounting only.

Natural draft appliance, requires adequate air supply.

No 240 volt required.

Available in Natural Gas or LP Gas.

• Hydrogenerator produces a small voltage to ignite and

control the water heater

• Water enters the hydrogenerator

• The turbine spins with the water flow through the unit

• A small voltage is generated by the turbine

• The voltage causes the ignition control unit to light a

temporary pilot

• The water pressure opens the main burner gas valve and

the pilot ignites the main burner, the pilot then goes out

• The water flows through the heat exchanger where it is

heated.

On / Off switch to allow customer to activate the appliance.

Safety devices

• Flame rod to check for accidental extinction of the burner

flame

• Over temperature switch to prevent overheating

• Flue safety device to shut of unit if flue spillage

Easily accessible water inlet filter.

Internal flue diverter, connection to external flue.

Fluing to be purchased by external supplier (refer to Bosch for

details of supplier).

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

Category CONTINUOUS FLOW

Type INTERNAL

Table 2

Type l/min Series Ignition Gas Types

GWH 10 2 G NG / LP gas

GWH 13 2 G NG / LP gas

GWH 16 2 G NG / LP gas

Table 3

Technical Characteristics and Dimensions

6 720 608 992 (2021/02)

2.5 Dimensions

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

[8] Gas connection

[9] Connection collar for flue

[10] Draught diverter

[11] Copper Heat exchanger

[12] Burner

[13] Gas valve

[14] Ignition unit

Dimensions

(mm)

A B C D E F G 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

Technical Characteristics and Dimensions

6 720 608 992 (2021/02)

2.6 Functional diagram of the heater

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

[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

12 345

171819207b21

6720608992-05.1V

Technical Characteristics and Dimensions

6 720 608 992 (2021/02)

2.7 Electrical diagram

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

[8] Temperature sensor

[9] Pilot solenoid (Normally Closed)

[10] Diaphragm valve

[11] Main Solenoid (Normally Open)

[12] Hydrogenerator

[13] LED - Burner status check

[14] Microswitch

2.8 Function

This gas heater is equipped with automatic electronic ignition

to simplify operation.

▶ To activate, just turn on the switch (Fig. 9).

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.

Regulations

6 720 608 992 (2021/02)

2.9 Technical characteristics

3Regulations

Any local by-laws and regulations pertaining to installation and

use of gas-heated appliances must be observed.

This appliance must be installed in accordance with the

manufacturers installation instructions, AS/NZS5601 and all

Local Building & Gas fitting regulations

It is recommended that for sanitary fixtures used for the

purpose of personal hygiene, that a temperature limiting

device be fitted (such as a tempering valve) as per AS/NZS

3500.1.9.3.

This appliance must not be installed in a bedroom, bathroom,

toilet, or combined living/sleeping room as per AS/NZS5601

5.12.5.2.

Failure to install this appliance in accordance with these

installation instructions will void the warranty.

Fluing is required to be installed in a vertical plane only, with no

bends. Please refer to fluing guidelines.

4 Installation

Technical characteristics Units GWH10 GWH13 GWH16

Gas Consumption

Nominal Gas Consumption MJ 79 100 (NG) 127

97 (LP gas)

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

Minimum operating pressure kPa 45 45 50

Minimum pressure for maximum flow kPa 100 140 170

Table 5

DANGER:

This appliance must not be installed in a

bedroom, bathroom, toilet or combined living/

sleeping room in accordance with AS/

NZS5601.

DANGER: Explosion Risk

▶ Always turn off the gas cock before

carrying out any work on components

which carry gas.

The gas installation, connection of the flue and

supply pipes, as well as the initial startup are to

be performed exclusively by an authorised

person.

Installation

6 720 608 992 (2021/02)

4.1 Important information

▶ Install in accordance with AS/NZS5601, AS/

NZS3500.4.2, NZS5261 and all local building, water and

gas fitting regulations particularly with regard to ventilation

requirements.

▶ Do not place articles on or against this appliance.

▶ Install gas and water isolation valves as close as possible to

the heater.

▶ After finishing the gas piping system, the pipes must be

thoroughly purged 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.

▶ Check if the heater corresponds to the type of gas

provided.

▶ Ensure adequate operating gas pressure and water

pressure (see technical data in the table 5).

4.2 Selection of the place of installation

Requirements regarding the place of installation

• Comply with the specific instructions for each State.

• Install the gas heater in a well-ventilated location where it

will not be exposed to temperatures below zero. Ensure

combustion gases are flued to outside atmosphere in

accordance with AS/NZS5601.

• To avoid corrosion, the combustion air must be free from

harmful substances. Examples of particularly corrosive

substances: halogenated hydrocarbons contained in

solvents, paints, glues, hairsprays and various domestic

detergents. If necessary, take adequate measures.

• Install the appliance in accordance with the minimum

installation clearances indicated in Fig. 4.

• The gas heater must not be installed over a heat source.

• Do not obstruct the openings at top and bottom of

appliance.

• Top and bottom areas must be clear from any obstacles at

least 300 mm.

In case of a frost risk:

▶ Turn off the heater.

▶ Drain the heater (see section 5.7)

Fig. 4 Minimum clearances (in mm)

Combustion gases

This appliance should only be installed in

applications where cold water temperature

does not exceed 40 °C.

The use of these heaters with water supply

pressure values below 50 kPa is not

recommended. This appliance requires a

minimum flow rate of 2.5lpm to operate.

Sufficient flow must be provided to ensure

correct operation of the appliance.

Installation in a marine environment should be

avoided.

Not suitable for pool, spa pool or solar

application.

Not suitable for commercial recirculating

systems.

DANGER:

Ventilation requirements as per AS/NZS5601.

Ensure not installed in a negative pressure

environment.

Negative pressure tests are required upon

installation to ensure adequate ventilation.

Use single or twin skin flue in accordance with

AS/NZS5601.

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