Bosch Optiflow GWH16 3 CT E31 F6 L S2405, Optiflow GWH16 3 CT E23 F6 L S2405, Optiflow GWH20 3 CT E23 F6 L S2405, Optiflow GWH20 3 CT E31 F6 L S2405, Optiflow GWH26 3 CT E23 F6 L S2405 Installation Manual
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Installation Manual
Gas continuous flow water heaters
Optiflow
6720817545-00.1V
GWH16/20/26 3 CT E23/31 F6 L S2405
6 720 817 545 (2016/02) AU
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!
6 720 817 545 (2016/02) Optiflow
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 Dimensions and minimum clearances . . . . . 6
2.8 Appliance layout . . . . . . . . . . . . . . . . . . . . . . 7
2.9 Electrical wiring diagram . . . . . . . . . . . . . . . 8
2.10 Specification . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Installation (only by authorised technicians) . . . . 10
4.1 Choice of installation site . . . . . . . . . . . . . . 10
4.1.1 Regulations concerning the
installation site . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Minimum clearances . . . . . . . . . . . . . . . . . . 11
4.3 Installing the appliance . . . . . . . . . . . . . . . . 11
4.4 Water connection . . . . . . . . . . . . . . . . . . . . 12
4.4.1 Temperature mixing device (not supplied
with the appliance) . . . . . . . . . . . . . . . . . . . 12
4.5 Gas connection . . . . . . . . . . . . . . . . . . . . . . 12
4.6 Altitude of installation site . . . . . . . . . . . . . 12
4.7 Remote control connection (optional) . . . . 13
4.8 Electrical connection (only by authorised
technicians) . . . . . . . . . . . . . . . . . . . . . . . . 13
4.8.1 Connecting the power cable . . . . . . . . . . . . 13
4.9 Commissioning of the appliance . . . . . . . . 14
4.10 Changing the setpoint limit temperature
(only for 55 °C preset appliances) . . . . . . . 14
4.11 Delivery temperature calibration . . . . . . . . 14
5 Regulating the gas (only for authorised
technicians) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Factory settings . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Service function . . . . . . . . . . . . . . . . . . . . . 15
5.3 Adjusting the appliance . . . . . . . . . . . . . . . 15
5.3.1 Access to test pointsads . . . . . . . . . . . . . . . 15
5.3.2 Adjusting the maximum flow
(Parameter P1) . . . . . . . . . . . . . . . . . . . . . .15
5.3.3 Adjusting the minimum flow
(Parameter P2) . . . . . . . . . . . . . . . . . . . . . .16
5.3.4 Adjusting pressure at the burner
(Parameter P0) . . . . . . . . . . . . . . . . . . . . . .16
5.4 Factory default settings . . . . . . . . . . . . . . . 17
6 Maintenance (only by authorised service
technician) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
6.1 Periodic maintenance . . . . . . . . . . . . . . . . . 17
6.2 Replacement of the fuse (electronic
control unit) . . . . . . . . . . . . . . . . . . . . . . . . .18
6.3 Start-up after completion of maintenance 18
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 Environment considerations . . . . . . . . . . . . . . . . . . 21
9 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10 Warranty details . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 720 817 545 (2016/02)Optiflow
Key to symbols and safety instructions | 3
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 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
Additional symbols
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, according
to local regulations.
▶ 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
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
•List entry
– List entry (second level)
Table 1
6 720 817 545 (2016/02) Optiflow
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.
Installation
Important information
▶ Determine the most appropriate location for the appliance.
Install only on an external wall 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
appliance to the wall using fixings suitable for the weight of
the appliance and the wall material.
▶ 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 9).
▶ If inlet water pressure exceeds 800 kPa a pressure limiting
valve (500 kPa) MUST be fitted. The prefer able location for
the pressure limiting valve is at the water meter.
▶ Where the pressure l imiting 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.
▶ Refer to 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
performed with the gas isolation valve 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 9). Refer to AS/NZS5601.1 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 accordance with AS/
NZS60335 in order to prevent hazards from occurring when
using electrical appliances:
DANGER:
This appliance must not be installed indoors
or in an enclosed space in accordance with
AS/NZS5601.
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 air entry openings.
▶ Periodic checking of openings to ensure
no blockage or obstruction 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.
Installation in marine environments can lead
to premature corrosion. Premature corrosion
due to the installation environment would not
be covered by warranty.
All gas appliances require adequate air intake
to ensure correct combustion. Insects and
dirt ingress may affect combustion causing
sooting. If you notice sooting from the flue
outlet the unit would require servicing. Pest
and dirt ingress is not covered by the
manufacturers warranty.
6 720 817 545 (2016/02)Optiflow
Product details | 5
“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 Declaration of Conformity
The appliance has been tested and certified to Australian
Standards.
2.2 Model overview
[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
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 temperature of the
incoming, outgoing and mixed water of the appliance.
•Safety devices:
–Flame sensor rod
–Thermal fuse
– Outgoing water temperature sensor
– Electronic control unit
–Air temperature sensor
– Frost-protection device
• Electrical connection: 230/240 V, 50 Hz
2.6 Optional accessories
• Main remote control
• Bathroom remote control
•Recess Box
• Flue diverters
Model GWH16/20/26 3 CT E23 F6 L S2405
Table 2
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
6 720 817 545 (2016/02) Optiflow
6 | Product details
2.7 Dimensions and minimum clearances
Fig. 1 Dimensions (in mm)
6720817545-02.1V
>10 >10
120
16065
344
45
55
105
524
170
Connections
Water Gas
Cold Hot Nat. LPG
GWH16/20/26 ¾ “ ¾“ ¾“ ¾“
Table 4
6 720 817 545 (2016/02)Optiflow
Product details | 7
2.8 Appliance layout
Fig. 2
[1] Flue terminal
[2] Flame sensor rod
[3] Burner
[4] Air pressure test point
[5] Water flow sensor and Water valve
[6] Fan
[7] Cold water temperature sensor
[8] Hot water outlet
[9] Cold water inlet
[10] By-pass valve
[11] Gas inlet
[12] Electronic control unit
[13] Gas valve
[14] Gas pressure test point
[15] Ignition electrode
[16] Heat exchanger
1
2
3
4
6
5
8
9 11 1210
15
13
16
7
6720817545-01.1V
14
6 720 817 545 (2016/02) Optiflow
8 | Product details
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 device
[6] Connection for remote control (optional)
[7] By-pass valve
[8] Modulation electrovalve (gas)
[9] Segmentation electrovalve 1 (gas)
[10] Segmentation electrovalve 2 (gas)
[11] Safety electrovalve (gas)
[12] Thermal fuse
[13] Water flow sensor
[14] Air temperature sensor
[15] Hot water temperature sensor
[16] Cold water temperature sensor
[17] Water valve
[18] Outlet water temperature sensor
230 V
AC
M1
5
1,2
3,4
5,6
7,8
9,10
11,12
13,14
10
15,16
1,2
3,4
5,6
7,8
9,10
11,12
13,14
M
6720813761-15.1V
1
32
4
6
7
8
9
11
13
14
15
16
17
18
12
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