Bosch OptiFlow Professional GWH16 1 CTD E23 F5 L User manual

Installation Manual
Room sealed gas continuous flow water heaters
Optiflow Professional
6720808879-00.1V
GWH12 | 16 | 20 1 CTD E23/31 F5 L
6 720 810 560 (2017/11) AU

2
Index
Optiflow Professional – 6 720 810 560 (2017/11)
Index
1 Key to symbols and safety instructions . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . 3
2 Product details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Declaration of Conformity . . . . . . . . . . . . . . 7
2.2 Type overview . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Included Items . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Rating plate . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Description of appliance . . . . . . . . . . . . . . . . 7
2.6 Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Dimensions and minimum clearances . . . . . 8
2.8 Appliance layout . . . . . . . . . . . . . . . . . . . . . . 9
2.9 Electrical wiring diagram . . . . . . . . . . . . . . 10
2.10 Specification . . . . . . . . . . . . . . . . . . . . . . . . 11
2.11 Flue accessories . . . . . . . . . . . . . . . . . . . . . 12
2.11.1 Selecting the Right Flue . . . . . . . . . . . . . . . 12
2.11.2 Vertical installation . . . . . . . . . . . . . . . . . . . 14
2.11.3 Horizontal installation . . . . . . . . . . . . . . . . . 14
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Installation (only by an authorised technicians) . 14
4.1 Important information . . . . . . . . . . . . . . . . . 14
4.2 Choice of installation site . . . . . . . . . . . . . . 15
4.2.1 Regulations concerning the installation
site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.2 Overall flue length of the installation . . . . . 15
4.3 Minimum clearances . . . . . . . . . . . . . . . . . . 15
4.4 Fitting hanging-plate . . . . . . . . . . . . . . . . . . 16
4.5 Installing the appliance . . . . . . . . . . . . . . . . 16
4.6 Water connection . . . . . . . . . . . . . . . . . . . . 16
4.7 Gas connection . . . . . . . . . . . . . . . . . . . . . . 16
4.8 Installation of flue accessories . . . . . . . . . . 16
4.9 Altitude of installation site . . . . . . . . . . . . . 17
4.10 Electrical connection (only by authorised
technicians) . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10.1 Connecting the power cable . . . . . . . . . . . . 18
4.11 Commissioning of the appliance . . . . . . . . 18
4.12 Changing the setpoint limit temperature (only
for 55 °C preset appliances) . . . . . . . . . . . 18
4.13 Delivery temperature calibration . . . . . . . . 18
5 Regulating the gas
(only for authorised technicians) . . . . . . . . . . . . . . .19
5.1 Factory settings . . . . . . . . . . . . . . . . . . . . . . 19
5.2 Service function . . . . . . . . . . . . . . . . . . . . . 19
5.3 Adjusting the appliance . . . . . . . . . . . . . . . 19
5.3.1 Access to the test points . . . . . . . . . . . . . . . 19
5.3.2 Adjusting the maximum flow
(Parameter P1) . . . . . . . . . . . . . . . . . . . . . .19
5.3.3 Adjusting the minimum flow
(Parameter P2) . . . . . . . . . . . . . . . . . . . . . .20
5.3.4 Adjusting pressure at the burner
(Parameter P0) . . . . . . . . . . . . . . . . . . . . . .20
5.4 Factory default settings . . . . . . . . . . . . . . . 21
6Maintenance
(only by authorised service technician) . . . . . . . . .21
6.1 To remove the front panel . . . . . . . . . . . . . 21
6.2 Periodic maintenance . . . . . . . . . . . . . . . . . 21
6.3 Replacement of the fuse (electronic control
unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.4 Start-up after completion of maintenance 22
6.5 Safe operation/ risk for prolonged use . . . 22
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8 Environmental considerations . . . . . . . . . . . . . . . . 25
9 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10 Warranty details . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3
Key to symbols and safety instructions
Optiflow Professional – 6 720 810 560 (2017/11)
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and used in this document:
•NOTICE indicates a situation that could resultin 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
Additional symbols
1.2 Safety Information
If you smell gas
A gas leak could potentially 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 andmodifications
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,
according to local regulations.
▶ The Owner/User is responsible for
keeping the area around the water
heater free from debris.
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.
This symbol indicates important information
where there is no risk to people or property.
Symbol Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
•Listentry
–List entry (second level)
Table 1

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Key to symbols and safety instructions
Optiflow Professional – 6 720 810 560 (2017/11)
▶ Safe access to inspect and service the
water heater is the responsibility of
the property owner.
▶ Use only genuine Bosch spare parts.
Explosive and highly flammable
material
▶ Do not use or store flammable
materials in or near this appliance.
Combustion air and surrounding air
▶ The combustion air and surrounding
air must be free from corrosive
substances.
▶ Do not spray aerosols in the vicinity of
this appliance while it is in operation.
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.
Tobeinstalled andservicedonly byan
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.
• 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
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 modify
this appliance.
Failure to install this appliance in
accordance with these installation
instructions will void the warranty and
may create an unsafe situation.

5
Key to symbols and safety instructions
Optiflow Professional – 6 720 810 560 (2017/11)
Installation
Important information
▶ Determine the most appropriate
location for the appliance. Install as
close as possible to the most
frequently used hot water outlet.
▶ Ensure the mounting structure is
capable of supporting the weight of
the appliance once installed. Secure
the heater to the wall using fixings
suitable for the weight of the
appliance and the wall material.
▶ Do not place articles on or against this
appliance.
▶ Install gas and water isolation valves
as close as possible to the appliance.
Only use a gate valve or full flow ball
valve (fixed mechanism type) for cold
water.
▶ Check the cold water supply pressure
to ensure it meets the required supply
pressure for the appliance. (see
table 5, page 11).
▶ If inlet water pressure exceeds 800
kPa a pressure limiting valve (500
DANGER: Explosion Risk!
▶ Always turn off the gas
valve before carrying out
any work on components
which carry gas.
DANGER: Appliance
malfunction!
This appliance must be
installed with no
obstructions to the flue
terminal.
▶ Periodic checking of the
flue terminal to ensure no
blockage or obstruction
of the openings from
plants, debris or insects
must be carried out.
The installation of gas,
water, and electrical supply,
and the initial startup are to
be performed by an
authorised person.
Not suitable for pool or spa
pool applications.
Not suitable for commercial
boosting of warm water
recirculation systems.
All gas appliances require
adequateair intaketoensure
correct combustion. Insects
and dirt ingress may affect
combustion causing sooting.
Ifyou notice sooting from the
flue outlet the unit would
require servicing. Pest and
dirt ingress is not covered by
the manufacturers warranty.

6
Key to symbols and safety instructions
Optiflow Professional – 6 720 810 560 (2017/11)
kPa) MUST be fitted. The preferable
location for the pressure limiting
valve is at the water meter.
▶ Where the pressure limiting valve is
less than 3 metres from the hot water
unit, it must be fitted in conjunction
with a cold water expansion valve
(700 kPa), between the water heater
and the pressure limiting valve.
▶ Failure to comply with this
requirement may void the warranty.
▶ Referto AS/NZS5601 for the relevant
gas pipe sizing.
▶ After finishing the gas piping system,
the pipes must be thoroughly purged
and leak tested. This test must be
performedwith the gas isolationvalve
of the appliance closed.
▶ Ensure the gas pressure and flow
through the regulator are appropriate
for the consumption of the heater
(see table 5, page 11). Refer to AS/
NZS5601 and AS3500, for the
relevant pipe size.
Note: Incorrect pipe sizing or gas supply
pressure may cause the appliance to
under perform. Service calls for
incorrect pipe sizing and/or gas
pressure, will NOT be covered under
warranty.
Safety of electrical appliances for
domestic use and similar purposes
The following requirements apply in
accordancewith EN 60335-1 inorder 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.”

7
Product details
Optiflow Professional – 6 720 810 560 (2017/11)
2 Product details
2.1 Declaration of Conformity
The appliance has been tested and certified to Australia
Standards.
2.2 Type overview
[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
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 has the indications on the performance of the
appliance, approval data and the serial number.
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
•Watervalve
• Temperature sensors for monitoring the temperature of the
incoming and outgoing water of the appliance.
•Safetydevices:
–Flamesensorrod
–Thermalfuse
– Hot water temperature sensor
– Electronic control unit
–Airtemperaturesensor
– Frost protection device
• Electrical connection: 230 V, 50 Hz
2.6 Accessory
• Flue accessories
• Mains remote control (optional).
• Bathroom remote control (optional).
Model GWH12/16/20 1 CTD E23/31 F5 L...
Table 2
GWH 12 1 CT D E 23 F5 L
GWH 12 1CT D E 31 F5 L
GWH 16 1 CT D E 23 F5 L
GWH 16 1CT D E 31 F5 L
GWH 20 1 CT D E 23 F5 L
GWH 20 1CT D E 31 F5 L
Table 3

8
Product details
Optiflow Professional – 6 720 810 560 (2017/11)
2.7 Dimensions and minimum clearances
Fig. 1 Dimensions (in mm)
Connections
Water Gas
A B C D E Cold Hot Nat. Universal
LPG
GWH12 300 570 170 120 107 ½ “ ½ “ ½ “ ½ “
GWH16 364 570 175 142 137
GWH20 364 570 175 142 137
Table 4 Dimensions (in mm)

9
Product details
Optiflow Professional – 6 720 810 560 (2017/11)
2.8 Appliance layout
Fig. 2
[1] Heat exchanger
[2] Flame sensor rod
[3] Burner
[4] Air pressure test point
[5] Fan
[6] Air temperature sensor
[7] Thermal fuse
[8] Hot water temperature sensor
[9] Hot water outlet
[10] Power cord and plug
[11] Combustion gas collector
[12] Frost protection device
[13] Ignition electrode
[14] Burner pressure test point
[15] Water flow sensor and Water valve
[16] Electronic control unit
[17] Cold water temperature sensor
[18] Gas shut-off valve
[19] Cold water inlet
[20] Gas pressure test point
[21] Gas inlet

10
Product details
Optiflow Professional – 6 720 810 560 (2017/11)
2.9 Electrical wiring diagram
Fig. 3 Electrical diagram
[1] Flame sensor rod
[2] Fan
[3] Ignition electrode
[4] Power supply
[5] Connection for frost protection
[6] Connection for remote control
[7] Modulation electrovalve (gas)
[8] Segmentation electrovalve 1 (gas)
[9] Segmentation electrovalve 2 (gas)
[10] Safety electrovalve (gas)
[11] Thermal fuse
[12] Water flow sensor
[13] Air temperature sensor
[14] Hot water temperature sensor
[15] Cold water temperature sensor
[16] Water valve