Bosch 7736503239 User Manual

Gas continuous flow water heaters

6720817545-00.1V

Optiflow

GWH16/20/26 3 CT E23/31 F6 L S2405

Operating Manual

Read installation manual prior to installation of this appliance!
Read user manual before putting this unit in operation!

Observe the warnings in the manuals!
The installation location must meet the requirements for sufficient ventilation!

Installation by an authorised person only!

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2 | Index

Index

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

1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . 3

2 Product details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Declaration of Conformity . . . . . . . . . . . . . . 5

2.2 Model overview . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Included items . . . . . . . . . . . . . . . . . . . . . . . . 5

2.4 Rating plate . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.5 Description of appliance . . . . . . . . . . . . . . . . 5

2.6 Optional accessories . . . . . . . . . . . . . . . . . . . 5

2.7 Appliance layout . . . . . . . . . . . . . . . . . . . . . . 6

3 Operation instructions . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Digital display - description . . . . . . . . . . . . . 7

3.2 Before commissioning the appliance . . . . . . 7

3.3 Switching the appliance on/off . . . . . . . . . . . 7

3.4 Temperature control . . . . . . . . . . . . . . . . . . . 7

3.5 Programming button . . . . . . . . . . . . . . . . . . . 8

3.6 Draining the appliance . . . . . . . . . . . . . . . . . 8

3.7 Codes of errors in the display . . . . . . . . . . . . 8

3.8 Cleaning the front of the appliance . . . . . . . 8

4 Maintenance (only by authorised installers) . . . . . . 8

5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Environment considerations . . . . . . . . . . . . . . . . . . 11

7 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Warranty details . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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Key to symbols and safety instructions | 3

1 Key to symbols and safety instructions

1.1 Key to symbols

Warnings

Warnings in this document are identified by a
warning triangle printed against a grey
background.
Keywords at the start of a warning indicate
the type and seriousness of the ensuing risk
if measures to prevent the risk are not taken.

The following keywords are defined and used in this document:

• NOTICE indicates a situation that could result in damage to
property or equipment.

• CAUTION indicates a situation that could result in minor to
medium injury.

• WARNING indicates a situation that could result in severe
injury or death.

• DANGER indicates a situation that will result in severe
injury or death.

Important information

This symbol indicates important information
where there is no risk to people or property.

Additional symbols

Symbol Explanation

▶ Step in an action sequence
 Cross-reference to another part of the document

•List entry
– List entry (second level)

Table 1

1.2 Safety Information

If you smell gas:

▶ Close the gas supply valve to the appliance.
▶ Isolate gas supply from gas meter or LPG cylinder.
▶ 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 in order to check the gas supply.

If you notice dark combustion gases or sooting:

▶ Isolate the gas supply to the heater.
▶ Notify an authorised technician.

Installation, assembly, and modifications

Installation, assembly, and modifications to the heater must
only be performed by an authorised technician.

Maintenance

▶ The water heater is required to have a service and safety

inspection every two years.

▶ The installer is responsible for the safety and

environmental compatibility of the installation.

▶ The owner/user is responsible for keeping the area around

the water heater free from debris.

▶ Safe access to inspect and service the water heater is the

responsibility of the property owner.

▶ Use only genuine Bosch spare parts.

Explosive and flammable material

▶ Do not store or use flammable material (paper, spray cans,

solvents, paints, etc) near the heater.

Combustion air and surrounding air

▶ The combustion air and surrounding air must be free from

corrosive substances.

▶ Do not spray aerosols or use chemicals around the heater

unless heater is disconnected from the power supply.

Risk of damage due to user error

User error can result in injury and damage to property.

▶ Ensure that children never play with or operate this

appliance.

▶ Ensure that only personnel who can operate this appliance

correctly have access to it.

▶ Refer to the operating and user instructions before

adjusting the water heater.

To be installed and serviced only by an authorised person

The “authorised installing person” is responsible for:

• Correct installation and 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 the operating instructions to the customer.

THIS APPLIANCE IS NOT SUITABLE FOR POOL OR SPA POOL
APPLICATIONS.
NOT SUITABLE FOR COMMERCIAL BOOSTING OF A WARM
WATER RECIRCULATION SYSTEM

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4 | Key to symbols and safety instructions

Regulations

All local by-laws and regulations pertaining to installation and
use of gas appliances must be observed.

This appliance must be installed in accordance with the
manufacturers installation instructions, AS/NZS5601, AS/
NZS3500, and all Local Building & Gas fitting regulations.

This appliance must not be installed indoors or in an enclosed
space. This appliance is approved for outdoor installation only.
Do not install this appliance with any modification or alteration.

Failure to install this appliance in accordance with these
installation instructions will void the warranty and may create
an unsafe situation.

Safety of electrical appliances for domestic use and similar
purposes

The following requirements apply in accordance with AS/
NZS60335 in order to prevent hazards from occurring when
using electrical appliances:

“This appliance can be used by children of 8 years and older, as
well as by people with reduced physical, sensory or mental
capabilities or lacking in experience and knowledge, if they are
supervised and have been given instruction in the safe use of
the appliance and understand the resulting dangers. Children
must not play with the appliance. Cleaning and user
maintenance must not be performed by children without
supervision.”

“If the power cable is damaged, it must be replaced by the
manufacturer, its customer service department or a similarly
qualified person, so that risks are avoided.”

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2 Product details

Product details | 5

2.1 Declaration of Conformity

The appliance has been tested and certified to Australian
Standards.

Model GWH16/20/26 3 CT E23 F6 L S2405

Table 2

2.2 Model overview

GWH 16 3CTE23F6 L
GWH 16 3CTE31F6 L
GWH 20 3CTE23F6 L
GWH 20 3CTE31F6 L
GWH 26 3CTE23F6 L
GWH 26 3CTE31F6 L

Table 3

[GWH]Gas continuous flow water heater
[16] Capacity (l/min)
[3] Generation
[CT] Thermostatic
[E] Electronic ignition
[23] Appliance set for natural gas
[31] Appliance set for LPG (universal LPG)
[F6] Outdoor installation
[L] Locked water temperature adjustment

2.3 Included items

• Gas continuous flow water heater

• Appliance documentation

–Thermal fuse
– Outgoing water temperature sensor
– Electronic control unit
–Air temperature sensor
– Frost-protection device

• Electrical connection: 230 V, 50 Hz

2.6 Optional accessories

• Main remote control

• Bathroom remote control

•Recess Box

• Flue diverters

2.4 Rating plate

The rating plate is located on the outside of the appliance, on
the bottom.

The plate specifies the performance of the appliance, approval
data and the serial number.

2.5 Description of appliance

• External wall-mounted appliance

• Appliance for operating with natural gas or LPG

• Electronic ignition

• Water flow sensor

•Water valve

•By-pass valve

• Temperature sensors for monitoring the temperatur e of the
incoming and outgoing water of the appliance.

•Safety devices:
–Flame sensor rod

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