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..

6 720 608 992 (2011/12) AU

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!

2 | Table of contents

Table of contents

	1 Key to symbols and safety instructions . . . . . . .		3	10	Water quality . . . . . . . . . . . . . . . . . . . . . . . . . .	20
	1.1	Explanation of symbols . . . . . . . . . . . . . . . .	3
	1.2	Safety information	3
				11	Warranty details	21

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

4.2Selection 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

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

6.3Conversion 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

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Key to symbols and safety instructions | 3

1 Key to symbols and safety instructions

1.1Explanation 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

Æa reference to a related part in the document or to other related documents

•a list entry

–a list entry (second level)

Table 1

1.2Safety information

If you smell gas:

B Close the gas supply valve.

B Open the windows.

BDo not operate any electrical appliances or switches (on/off).

B Extinguish other sources of ignition.

BGo 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 an authorised technician.

Assembly, modifications

BThe assembly and modifications to the heater can only be performed by an authorised installer.

BDo not modify the pipes which conduct combustion gases.

B Do not close or reduce air circulation vents.

Maintenance

BWe recommend the system be serviced regularly to ensure it functions reliably and safely.

BThe 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

BDo not store or use inflammable material (paper, solvents, paints, etc) near the heater.

Combustion air and surrounding air

BTo avoid corrosion, the combustion air and surrounding air must be free from harmful substances (e.g. halogenated hydrocarbons which contain chlorine and fluorine compounds).

BDo not spray pressure pack or use chemicals around the heater

Information to the customer

B Inform the customer about how to operate the heater.

BThis 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.

BCaution 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.

BEnsuring the appliance performs to the specifications stated on the rating label.

BDemonstrating 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.

6 720 608 992 (2011/12)

4 | Technical Characteristics and Dimensions

2 Technical Characteristics and Dimensions

2.1General Description

Model	GWH 10/13/16 -2 G..
Category	CONTINUOUS FLOW
Type	INTERNAL
Table 2

•Gas flow adjustment proportional to the water flow to 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.

2.2Explanation of Model Code

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

2.3Package contents

•Gas heater

•Fixing Brackets

•flexible water pipes

•Gas regulator

•Heater documentation

2.4Description 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.

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Technical Characteristics and Dimensions | 5

2.5Dimensions

Fig. 1

1	Front cover							8	Gas connection
2	Opening in rear panel for mounting on the wall							9	Connection collar for flue
3	Temperature/volume selector							10	Draught diverter
4	Gas adjustment							11	Copper Heat exchanger
5	Digital display							12	Burner
6	Switch/LED - Low water pressure indicator							13	Gas valve
7	LED - Burner status check							14	Ignition unit
													H (Ø)
	Dimensions
	(mm)		A		B	C	D	E	F		G		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

2.6Functional diagram of the heater

1 2 3 4 5

32

31

					6
		30			15
		29			7a
		28			8
		27			33
		26			10
					9
		25			11
		24			12
					13
		23			14
		22
					16
		21 7b 20 19	18	17	6720608992-05.1V
Fig. 2		Functional diagram
1	Pilot burner		17	Diaphragm
2	Ignition Electrode		18	Main gas valve
3	Ionisation probe		19	Maximum gas adjusting screw
4	Heat exchanger		20	Gas supply pipe
5	Main burner		21	Gas filter
6	Injector		22	Hot water pipe
7a	Burner pressure test point		23	Ignition unit
7b	Gas inlet pressure test point		24	Temperature sensor
8	Slow ignition valve		25	Servo valve
9	Venturi		26	Power selector
10	Temperature/volume selector		27	Gas valve
11	Water valve		28	Pilot valve
12	Plunger		29	Pilot injector
13	Water flow regulator		30	Pilot gas pipe
14	Water filter		31	Overtemperature switch
15	Hydrogenerator		32	Flue gas safety device
16	Cold water pipe		33	Relief Valve/Drain screw

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Technical Characteristics and Dimensions | 7

2.7Electrical diagram

Fig. 3			Electrical diagram
1	Ignition electrode																		8		Temperature sensor
2	Ignition unit																		9		Pilot solenoid (Normally Closed)
3	Switch/LED - Low water pressure indicator																		10		Diaphragm valve
4	Digital display																		11		Main Solenoid (Normally Open)
5	Ionisation probe																		12		Hydrogenerator
6	Flue gas safety device																		13		LED - Burner status check
7	Overtemperature switch

2.8Function

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.

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8 | Technical Characteristics and Dimensions

2.9	Technical characteristics
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

6 720 608 992 (2011/12)