Bosch TF250 Technical Document

Installation Manual and Operating Instructions

Continuous Flow Gas Water Heaters (External Models)

Pilot Ignition

TF250... | TF400...

6 720 886 398 (2021/02) AU

Table of contents

Pilot Ignition – 6 720 886 398 (2021/02)

Table of contents

1 Safety information and symbols . . . . . . . . . 3

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

1.2 Safety information . . . . . . . . . . . . . . . 3

2 Technical Characteristics and Dimensions 5

2.1 General Description . . . . . . . . . . . . . . 5

2.2 Explanation of Model Code . . . . . . . . 5

2.3 Package contents . . . . . . . . . . . . . . . . 5

2.4 Description of the Hot Water Unit . . . 5

2.5 Dimensions . . . . . . . . . . . . . . . . . . . . . 6

2.6 Technical characteristics . . . . . . . . . . 7

3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Important information . . . . . . . . . . . . 8

4.2 Requirements of the installation

location . . . . . . . . . . . . . . . . . . . . . . . 10

4.3 Hot Water Unit mounting . . . . . . . . . 11

4.3.1 Flue baffle setting . . . . . . . . . . . . . . . 11

4.3.2 Mounting the heater . . . . . . . . . . . . . 11

4.4 Water connection . . . . . . . . . . . . . . . 12

4.5 Gas connection . . . . . . . . . . . . . . . . . 12

4.6 Testing . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Commissioning 10 litres appliances . . . . . 13

5.1 Before starting up the heater . . . . . . 13

5.2 Remove the front cover . . . . . . . . . . 13

5.3 Inlet pressure adjustment . . . . . . . . 13

5.4 Burner pressure adjustment . . . . . . 13

5.5 Conversion to a different

type of gas . . . . . . . . . . . . . . . . . . . . 14

6 Commissioning 16 litres appliances . . . . . 15

6.1 Before starting up the heater . . . . . . 15

6.2 Remove the front cover . . . . . . . . . . 15

6.3 Water flow adjustment . . . . . . . . . . . 15

6.4 Inlet operating pressure adjustment 15

6.5 Burner pressure adjustment . . . . . . 16

6.6 Thermostat calibration . . . . . . . . . . . 16

6.7 Conversion to a different

type of gas . . . . . . . . . . . . . . . . . . . . 16

7 Operating instructions . . . . . . . . . . . . . . . . . 17

7.1 Procedure to light 10 Litres

appliance . . . . . . . . . . . . . . . . . . . . . 17

7.1.1 Lighting the appliance . . . . . . . . . . . 17

7.1.2 Output control . . . . . . . . . . . . . . . . . 17

7.1.3 Consumer temperature/flow

adjustment . . . . . . . . . . . . . . . . . . . . 17

7.1.4 Shutting OFF the appliance . . . . . . . 17

7.2 Procedure to light 16 Litres

appliance . . . . . . . . . . . . . . . . . . . . . 18

7.2.1 Lighting the appliance . . . . . . . . . . . 18

7.2.2 Shutting OFF the appliance . . . . . . . 18

8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 19

9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 20

9.1 Problem/cause/solution . . . . . . . . . 20

10 Environmental protection . . . . . . . . . . . . . . 22

11 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . 22

12 Warranty details . . . . . . . . . . . . . . . . . . . . . . 23

Safety information and symbols

Pilot Ignition – 6 720 886 398 (2021/02)

1 Safety information and symbols

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:

▶ Close the gas supply valve to the

appliance.

▶ Isolate gas supply from gas meter or

LPG bottle.

▶ 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

▶ The installation, assembly and

modifications to the heater must only

be performed by an authorised

installer.

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.

▶ Only original spare parts must be

used, supplied by an authorised

distributor of Genuine Bosch parts.

Explosive and highly flammable

material

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

Safety information and symbols

Pilot Ignition – 6 720 886 398 (2021/02)

▶ Do not use or store flammable

materials in or near this appliance.

Combustion air and surrounding air

▶ To avoid corrosion, the combustion

air and surrounding air must be free

from harmful substances.

▶ Do not spray aerosols in the vicinity of

this appliance while it is in operation.

Risk of damage due to operator error

Operator errors can result in injury and

damage to property.

▶ Ensure that children never operate

this appliance unsupervised.

▶ 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.

Tobe installed andservicedonly 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 these instructions to

customer.

THIS APPLIANCE IS NOT SUITABLE FOR

POOL, SPA POOL OR SOLAR BOOSTER

APPLICATION.

NOT SUITABLE FOR COMMERCIAL

BOOSTING OF A WARM WATER

RECIRCULATION SYSTEM.

Do not modify this appliance.

WARNING:

This appliance may deliver

water at high temperature.

Refer to the Plumbing Code pf

Australia (PCA), local

requirements and installation

instructions to determine if

additional delivery

temperature control is

required.

Technical Characteristics and Dimensions

Pilot Ignition – 6 720 886 398 (2021/02)

2 Technical Characteristics and Dimensions

2.1 General Description

The appliance has been AS/NZS 5263.1.2 tested.

2.2 Explanation of Model Code

2.3 Package contents

•Gashotwaterunit

• Documentation

2.4 Description of the Hot Water Unit

• Hot Water Unit for external wall-mounting only

• Available in Natural gas or LP gas

•Safetydevices:

– Thermocouple to check for accidental extinction of the

pilot flame

– Overtemperature switch to prevent overheating.

• Water filter on the inlet water supply

Economical

Only heating water when required, the Bosch range is

extremely economical to run.

Versatile

LPG models are particularly popular in country areas, where

Natural Gas is not available.

Low Temperature Areas

In areas where the atmospheric temperature may drop to 0 °C

for brief periods, the installation of an EXOGEL valve (part

number H707 060 151) will minimise the possibility of

damage to the appliance if the water freezes.

Fig. 1 EXOGEL valve

[1] Hot water

[2] Cold water

[3] EXOGEL valve

Low Flow Rates

This gas water heater is designed to operate at a minimum flow

rate between 3.2 to 4.0 litres per minute. Sufficient flow must

be provided to ensure the correct operation of the appliance.

There are various causes of a low flow rate including, but not

limited to:

•Lowflowtapware

• Flow restrictors/aerators

•Handheldshowers

• Poor inlet pressure to property

• Restrictive pipework and/or fittings

Water fixtures and appliance settings must ensure that the flow

rate of hot water does not fall below the minimum requirement.

Failure of the unit to operate correctly due to poor flow rate will

not be covered by warranty.

Models TF250/400

Category CONTINUOUS FLOW

Type GAS - EXTERNAL INSTALLATION

Table 2

TF (Top Flue) 250 (10 litres/min @ 25 °C Rise)

TF (Top Flue) 400 (16 litres/min @ 25 °C Rise)

Table 3

NOTICE:

This water heater MUST NOT be installed in

areas where the temperature remains below

0 °C for extended periods.

Technical Characteristics and Dimensions

Pilot Ignition – 6 720 886 398 (2021/02)

2.5 Dimensions

Fig. 2

[1] Top flue

[2] Front cover

[3] Inspection window

[4] Wall mounting point

[5] Cold water inlet

[6] Gas inlet

[7] Hot water outlet

[8] Access panel

Dimensions (mm) A B C D E Weight (kg)

TF250 405 845 533 240 100 21

TF400 460 936 533 240 100 25

Table 4 Dimensions

Technical Characteristics and Dimensions

Pilot Ignition – 6 720 886 398 (2021/02)

2.6 Technical characteristics

Technical characteristics Units TF250... TF400...

Gas Consumption

Nominal Gas Consumption MJ/h 82 130

Ø burner injector mm 1.20 (NG)

0.75 (LPG)

1.30 (NG)

Supply pressure flowing

Natural gas (When operating) kPa 1.13 1.13

LP gas (When operating) kPa 2.6 2.6

Number of injectors 12 18

Water data

Maximum permissible pressure (Static) kPa 1200 1200

Temperature selector in fully clockwise position

Temperature rise (Above incoming water temperature) °C 55 _

Water flow range (Litres per minute) l/min 3.5 to 4.5 _

Minimum operating water pressure kPa 30 (NG)

10 (LPG)

Minimum constant water pressure for minimum flow kPa 60 _

Temperature selector in fully anti-clockwise position

Temperature rise (Above incoming water temperature) °C 25 _

Water flow range (Litres per minute) l/min 4 to 10 _

Minimum operating water pressure kPa 45 _

Minimum constant water pressure for maximum flow kPa 90 (NG)

55 (LPG)

Table 5

Regulations

Pilot Ignition – 6 720 886 398 (2021/02)

3Regulations

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.

Failure to install this appliance in accordance with these

installation instructions will void the warranty and may create

an unsafe situation.

4 Installation Fig. 3 Minimum heat shield requirements

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 at the

front, rear, side, or top.

▶ Periodic checking of openings to ensure

no blockage or obstruction of the air

openings from plants, debris, or insects

must be carried out.

DANGER: Property damage!

If this appliance is to be installed on a

combustible surface:

▶ Use a heat shield as per AS/NZS5601.

The installation and the initial startup are to

be carried out only by an authorised person.

Not suitable for pool, spa pool, or solar

booster application.

Not suitable for commercial boosting of a

warm water recirculation system.

This appliance should only be installed in

applications where incoming cold water

temperature does not exceed 40 °C.

Minimum water supply pressure must meet

the requirements set out in table 5.

Water fixtures and appliance settings must

ensure that the flow rate of hot water does

not fall below the minimum requirement.

To reduce the chance of corrosion,

installation in a marine environment should

be avoided. Premature corrosion due to the

installation environment would not be

covered by warranty.

400 mm

850 mm

230 mm

9708069951-12.1V

Installation

Pilot Ignition – 6 720 886 398 (2021/02)

4.1 Important information

▶ Determine most suitable location for the appliance. Install

only on an external wall as close as possible to the most

frequently used hot water outlet. If the unit isto be installed

on a combustible surface, use a heat shield. Allow a

minimum air gap of 10mm between the flue and the heat

shield.

▶ Unit must be commissioned upon installation.

▶ 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.

▶ Do not place articles on or against this appliance.

▶ Install gas and water isolation valves as close as possible to

the heater. Only use 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.

(table 5).

▶ If the inlet water pressure exceeds 800 kPa, a pressure

limiting valve (500 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.

▶ 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 (table 5).

Refer to AS/NZS5601 and AS3500.1 for the relevant pipe

size.

▶ As the water temperature at the outlet may exceed 50 °C, a

temperature limiting device (such as a tempering valve)

must be fitted to pipework feeding sanitary fixtures used

for the purpose of personal hygiene as per AS3498.

Note: Incorrect pipe sizing or gas supply pressure may cause

the appliance to underperform. Service calls for incorrect pipe

sizing and/or gas pressure, will NOT be covered under

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.

Installation

Pilot Ignition – 6 720 886 398 (2021/02)

4.2 Requirements of the installation location

• Comply with the specific instructions for each State.

• Install the appliance in an outdoor location where it will not

be exposed to temperatures below zero.

• Install the appliance in accordance with the minimum

installation clearances indicated in Fig. 4, according to

AS/NZS5601.

• The gas heater must not be installed over a heat source.

• Location must allow for safe servicing and customer

operation.

• Side clearances to be measured from flue outlet, not wind

baffles.

• Do not obstruct the openings at top, bottom and rear of

appliance.

• Maximum of 2 meters from the ground to the base of the

appliance.

• Top and bottom areas must be clear from any obstacles at

least 30 cm.

Fig. 4 Minimum clearances (use as a guide only, always refer to AS/NZS5601)

[D] Openable Door

[T] Flue terminal

[M] Gas meter

[I] Mechanical air inlet

[P] Electricity meter or fuse box

[W] Openable window

9708069951-14.2V

Ref. Item Minimum

clearances (mm)

a Below eaves, balconies and other projections:

- Appliances over 50 MJ/h input 500

b From the ground, above a balcony or other surface1) 300

cFrom a return wall or external corner1) 500

Table 6

This manual suits for next models

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