Bosch 7736502488, 7736502490, 7736502489, 7736502487, 7736502496 User Manual

Room sealed gas continuous flow water heaters

6720808879-00.1V

OptiFlow Professional

GWH12/16/20 1 CTD E23/31 F5 L

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 EC Declaration of Conformity . . . . . . . . . . . . 4

2.2 Type overview . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Included Items . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

2.6 Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

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

3.2 Before first use of 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 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

4Maintenance

(only by authorised service technicians) . . . . . . . . .8

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

6 Environmental 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

A gas leak could potentia lly cause an explosion. If you smell gas,
observe the following rules.

▶ Avoid producing flames or sparks:

– Do not smoke, do not use a lighter or strike matches.
– Do not operate any electrical switches or unplug any

equipment.

– Do not use the telephone or ring doorbells.

▶ Turn off the gas supply at the main shut-off valve or at the

gas meter.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Stay well away from the building: call the emergency

services and the gas supplier.

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 errors 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 installer is responsible for:

• Correct installation and commissioning of this appliance.

• Ensuring the appliance performs to the specifications

stated on the rating label.

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4 | Product details

• Demonstrating the operation of the appliance to the
customer before leaving.

• Handing these instructions to customer.

THIS APPLIANCE IS NOT SUITABLE FOR POOL OR SPA POOL
APPLICATIONS.
HANDING THE OPERATING INSTRUCTIONS TO THE
CUSTOMER.
NOT SUITABLE FOR COMMERCIAL BOOSTING OF A WARM
WATER RECIRCULATION SYSTEM

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.

The appliance must not be installed outdoors. The appliance is
approved for indoor 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 EN
60335-1 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.”

2 Product details

2.1 EC Declaration of Conformity

The appliance has been tested and certified to Australian
Standards.

Model GWH12/16/20 1 CTD E23/31 F5 L...

Table 2

2.2 Type overview

GWH 12 1CTDE23 F5 L
GWH 12 1CTDE31 F5 L
GWH 16 1CTDE23 F5 L
GWH 16 1CTDE31 F5 L
GWH 20 1CTDE23 F5 L
GWH 20 1CTDE31 F5 L

Table 3

[GWH]Gas continuous flow water heater
[12] Capacity (l/min)
[1] Generation
[CT] Thermostatic
[D] Digital user interface
[E] Electric ignition
[23] Appliance set for natural gas
[31] Appliance set for Universal LP gas
[F5] Tight chamber
[L] Locked water temperature adjustment

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2.3 Included Items

• Gas continuous flow water heater

• Fixing bracket

• Appliance documentation

2.4 Rating plate

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

The rating plate specifies the performance of the appliance,
approval and serial numbers.

2.5 Description of appliance

• Room sealed wall-mounted appliance for internal

installation.

• Multifunctional display panel

• Suitable for Natural Gas or Universal LPG

• Electronic ignition

• Water flow sensor

•Water valve

• Temperature sensors for monitoring the temperatur e of the

incoming and outgoing water of the appliance.

•Safety devices:

–Flame sensor rod
–Thermal fuse
– Hot water temperature sensor
– Electronic control unit
– Air temperature sensor

• Electrical connection: 230 V, 50 Hz

• Frost protection device.

Product details | 5

2.6 Accessory

•Flue accessories

• Remote control (optional).

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