Bosch T4200 14-2D Guide

Installation and Users Instructions
Gas Instantaneous Water Heater
Therm 4200
T4200 11/14/18-2D
6 720 821 605 (2017/08) ZA

2
Table of contents
Therm 4200 – 6 720 821 605 (2017/08)
Table of contents
1 Key to symbols and safety instructions . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . .. . . . . . . . . . . .. . . . 3
1.2 Safety information . . . . . . . . . . . .. . . . . . . . . . . . . 3
2 Technical Characteristics and Dimensions . . . . 6
2.1 Type overview . . . . . . . . . . . . .. . . . . . . . . . . .. . . . 6
2.2 Material attached . . . . . . . . . .. . . . . . . . . . . .. . . . 6
2.3 Type plate . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . 6
2.4 Description of appliance . . . . . . . . . . .. . . . . . . . . . 6
2.5 Accessory (not supplied with the appliance) . . . . 6
2.6 Dimensions . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . 7
2.7 Electrical diagram . . . . . . . . . .. . . . . . . . . . . .. . . . 8
2.8 Function . . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . 8
2.9 Technical Data . . .. . . . . . . . . . . . .. . . . . . . . . . . . . 9
3Use. . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . .. . . 10
3.1 Digital display - description . . . . . . . .. . . . . . . . . 10
3.2 Batteries . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . 10
3.3 Before starting up the heater . . . . . . . . . . . . .. . . 10
3.4 Turning the heater on and off .. . . . . . . . . . . .. . . 10
3.5 Water flow . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . 11
3.6 Power adjustment . . . . . . . . . . . . .. . . . . . . . . . . . 11
3.7 Temperature/flow adjustment . . . . . . . . .. . . . . . 11
4Regulations. . . . . . . . . . .. . . . . . . . . . . .. . . . . . 11
5 Installation (must be carried out only by 
qualified technicians) . . . . . . . . . . . . . . . . . .. . . 12
5.1 Important information . . . . . . . . . . . . . . .. . . . . . 12
5.2 Selection of location for installation . . . . . . . . . . 12
5.3 Fixing the appliance . . . . . . . . . . .. . . . . . . . . . . . 13
5.4 Water connection . . . . . . .. . . . . . . . . . . .. . . . . . 13
5.5 Hydrogenerator operation . . . . . . . . . . . .. . . . . . 14
5.6 Gas connection . . . . . . . . . . . .. . . . . . . . . . . .. . . 14
5.7 Commissioning . . . . . . . . . . . . . . .. . . . . . . . . . . . 14
6 Adjustments (must be carried out only by . . . .. .
qualified technicians) . . . . . . . . . . . . .. . . . . . . . . . . .. . . 15
6.1 Factory regulations . . . . . .. . . . . . . . . . . .. . . . . . 15
6.2 Pressure regulation . . . . . . . . . . . . . . . . . .. . . . . . 15
6.3 Conversion to a different type of gas . . . . . . . . . . 16
7 Maintenance (must be carried out only by . . . . . .
qualified technicians) . . . . . . . . . .. . . . . . . . .. . . . . . . . . 16
7.1 Periodic maintenance tasks . . . . . . . . . . . . . . .. . 16
7.2 Startup after maintenance work . . . . . . . . . . . . . 16
7.3 Heater purge . . . . . . . . . . . . . .. . . . . . . . . . . . .. . 16
7.4 Flue gas safety device . . . . . . .. . . . . . . . . . . . .. . 17
7.5 Safe operation/ risk for prolonged use . . . . . . . . 17
8Problems. . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . 18
8.1 Problem/cause/solution . .. . . . . . . . . . . . .. . . . . 18
9 Environment / disposal . . . . . . . . . . . . . .. . . . . 19
10 Warranty Terms . . . . . . . . . .. . . . . . . . . . . . .. . 19

3
Key to symbols and safety instructions
Therm 4200 – 6 720 821 605 (2017/08)
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
ifmeasurestopreventtheriskarenottaken.
The following keywords are defined and can be used in this
document:
•NOTICEindicatesasituationthatcouldresultindamageto
property or equipment.
•CAUTIONindicatesa situationthat could result in minorto
medium injury.
•WARNING indicates a situation that could result in severe
injury or death.
•DANGER indicates a situation that willresult in severe
injury or death.
Important information
Thissymbolindicatesimportantinformation
where there is no risk to people or property.
Additional symbols
Table 1
Symbol Explanation
▶Step in an action sequence
Cross-reference to another part of the document
•List entry
–List entry (second level)
1.2 Safety information
Important
▶ Read these instructionsfor use
carefully so as to familiarize yourself
with the appliance before connecting
it to its gas container.
▶ Keep these instructions for future
reference.
If there is a smell of gas:
▶ Close the gas valve.
▶ Open windows.
▶ Do not connect any electrical
appliance.
▶ Extinguish any naked flames.
▶ Phone the gas company or an
authorized technician from a safe
distance.
If there is a smell of burnt gases:
▶ Disconnect the appliance.
▶ Open doors and windows.
▶ Inform an installation company.
Fitting, modifications
▶ The fitting and modification of the
installation of the appliance must be
carried out only by an authorized
technician.
▶ The installation of the water heater
may only be carried out by a
registered installer and that such
installations shall comply with the
requirements of SANS 10087-1.
▶ The pipes carrying burnt gases must
not be modified.
▶ Do not close or reduce air circulation
holes.

4
Key to symbols and safety instructions
Therm 4200 – 6 720 821 605 (2017/08)
Maintenance
▶ The user must maintain and
periodically service the appliance.
▶ The user is responsible for the safety
and environmental compatibility of
the installation.
▶ The appliance should be serviced
annually.
▶ Only original spare parts should be
used.
Explosive and inflammable materials
▶ Inflammable materials (paper,
solvents, ink, etc.) should not be
stored near the appliance.
Combustion air and ambient air
▶ To avoid corrosion, combustion air
and ambient air should be free of
aggressive substances (for example
halogenated hydrocarbons
containing chlorine and fluoride
composites).
Important information for the user
▶ This appliance may only be installed
by a registered LP Gas installer.
▶ All registered installers are issued
with a card carrying their registration
number.
▶ Ask to be shown the card before
allowing the installation work to
commence and make a note of the
Installer QCC number. Upon
completion of the installation, the
installer is required to explain the
operational details of the appliance
together with the safety instructions.
You will be asked to sign acceptance
of the installation and be provided
with a completion certificate. You
shouldonlysignforacceptanceofthe
installation when the installation is
completed to your satisfaction.Note
that your invoice is required in the
eventthatyouwishmakeaguarantee
claim.
Important information for the
installer
▶ This appliance may only be installed
by a LP gas installer registered with
the Liquefied Petroleum Gas
Association of Southern Africa.
▶ The appliance must be installed in
accordance with the requirements of
SANS 10087-1 and any fire
department regulations and/or local
by laws applicable to the area. If in
doubt check with the relevant
authority before undertaking the
installation.
▶ Upon completion of the installation
you are required to fully explain and
demonstrate to the user the
operational details and safety
practices applicable to the appliance
and the installation.
Client information
▶ Inform the client about the function
and operation of the appliance.
▶ Caution clients against performing
modifications or repairs themselves.

5
Key to symbols and safety instructions
Therm 4200 – 6 720 821 605 (2017/08)
Safety of electrical appliances for
domestic use and similar purposes
The following requirements apply in
accordancewithEN60335-1inorderto
prevent hazards from occurring when
using electrical appliances:
“This appliance can be used by children
of8yearsandolder,aswellasbypeople
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.Childrenmustnotplaywiththe
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.”

6
Technical Characteristics and Dimensions
Therm 4200 – 6 720 821 605 (2017/08)
2 Technical Characteristics and
Dimensions
2.1 Type overview
Table 2
T4200 11 -2 D23
31
T4200 14 -2 D23
31
T4200 18 -2 D23
31
[T] Gas instantaneous water heater
[4200] Series
[11] Capacity (l/min)
[-2] Version
[D] Digital display
[23] Appliance set for natural gas
[31] Appliance set for LPG
2.2 Material attached
•Gaswaterheater
• Fixing elements
• Connections elements
• Documentation
• Two 1.5 V batteries type R
2.3 Type plate
Thetypeplateislocatedontheleft side of the appliance, on the
bottom.
It contains details of the output of the appliance, the order
number, the approvaldata and the date of manufacture in
encoded form (FD).
2.4 Description of appliance
Operating convenience, as the heater is ready to operate by
simply pressing a switch.
• Heater for wall-mounting
• Ignitionbyelectronicdevicetriggeredwhenthewatervalve
opens
• Gauge to display temperature, burner operation and
malfunctions
• Temperature sensor to monitor the water temperature at
the heater output
• Great savings in comparison with conventional heaters,
due to the possibility of power adjustment and no
permanent pilot flame
• Natural gas/LPG burner
• Semi-permanent pilot burner which only functions during
the period between the opening of the water valve and the
ignition of the main burner
• Heat exchanger without tin/lead covering
• Water valve in fibreglass-reinforced polyamide, 100%
recyclable
• Automatic adjustment of the water flow by means of a
device which permits a constant flow to be maintained in
spite of variable pressure supplies
• Gas flow adjustment proportional to the water flow to
maintain a constant high temperature.
•Safetydevices:
– Ionisation probe to check foraccidental extinction of
the burner flame
– Fluegassafetydevicewhichturnsofftheheaterincase
of inadequate combusted gas evacuation conditions
– Temperaturelimiterwhichpreventsoverheatingof the
heat exchanger
2.5 Accessory (not supplied with the appliance)
• Conversion kit from natural gas to butane/propane and
vice-versa.

7
Technical Characteristics and Dimensions
Therm 4200 – 6 720 821 605 (2017/08)
2.6 Dimensions
Fig. 1
[4] Heat exchanger
[5] Burner
[10] Temperature/volume selector
[20] Gas connection
[23] Ignition unit
[24] Battery compartment
[26] Power selector
[34] LED - Burner status check
[35] Switch / LED - Battery status check
[36] Front cover
[37] Hole for fixing to wall
[38] Exhaust pipe union
[39] Flue with non-return device
[40] Gas valve
[42] Digital display
Table 3 Dimensions
Dimensions (mm) A B C D E F G H (Ø)
Natural gas LPG
T4200 11-2D... 310 580 228 112,5 463 60 25 1/2”
T4200 14-2D... 350 655 228 125 510 95 30 1/2”
T4200 18-2D... 425 655 334 125 540 65 30 1/2”

8
Technical Characteristics and Dimensions
Therm 4200 – 6 720 821 605 (2017/08)
2.7 Electrical diagram
Fig. 2 Electrical diagram
[2] Spark plug
[3] Ionisation probe
[15] Micro-switch
[23] Ignition unit
[24] Battery compartment
[25] Servo valve (normally open)
[28] Gas valve (normally closed)
[31] Temperature limiter
[32] Flue gas safety device
[33] Diaphragm valve
[34] LED - Burner status check
[35] Switch / LED - Battery status check
[41] Temperature sensor
[42] Digital display
2.8 Function
This gas heater is equipped with automatic electronic ignition
which simplifies its operation.
▶ To do so, just turn on the switch (Fig. 6).
Afterthis procedure,automatic ignition occurswhenever a hot
water tap is opened. First, the pilot burner is lit and
approximately four seconds afterwards the main burner. The
pilot burner flame is then extinguished after a short period of
time.
This is a way of saving a great amount of energy as the pilot
burner only operates for the minimum necessary time to ignite
the main burner, in contrast to conventional systems which
operate permanently.
Air in the gas supply pipe when the heater is
started up may cause ignition to fail.
If this happens:
▶ Close and open the hot water tap to repeat the ignition
process until all the air has been purged.

9
Technical Characteristics and Dimensions
Therm 4200 – 6 720 821 605 (2017/08)
2.9 Technical Data
Table 4
Technical Data Symbol Units T4200 11-2D T4200 14-2D T4200 18-2D
Output and heat demand
Rated max. heat output Pn kW
(Btu/h) 19,2 (65570) 23,6 (80595) 30,5 (104165)
Rated min. heat output Pmin kW
(Btu/h) 7,0
(23905) 9,0 (30710) 9,3 (31733)
Output (modulation range) kW
(Btu/h) 7 - 19,2 (23905-65570) 9,0 - 23,6 (30710-80595) 9,3 - 30,5 (31733-104165)
Rated max. heat input Qn kW
(Btu/h) 21,8
(74450) 27,0 (92210) 34,5 (117825)
Rated min. heat input Qmin kW
(Btu/h) 9,5 (32415) 10,4 (35486) 10,8 (36851)
Gas supply specifications1)
1) Hi 15 °C - 1013 mbar - dry: Natural gas 34.2 MJ/m3(9.5 kWh/m3) 
LPG: Butane 45.72 MJ/kg (12.7 kWh/kg) - Propane 46.44 MJ/kg (12.9 kWh/kg)
Supply pressure
Natural gas H G20 kPa 2,0 2,0 2,0
LPG (butane/propane) G30/G31 kPa 2,8 2,8 2,8
Consumption
Natural gas H G20 m3/h 2,2 2,77 3,5
LPG (butane/propane) G30/G31 kg/h 1,75 2,2 2,79
Number of injectors 12 14 18
Water system specifications
Max. water pressure2)
2) Considering the water dilution effect this value must not be exceeded
pw MPa 1,2 1,2 1,2
Temperature control at maximum setting
Temperature increase °C 50 50 50
Flow range l/min 2 - 5,5 2 - 7 2 - 8,8
Min. operating pressure pwmin MPa 0,01 0,01 0,02
Minimum pressure for maximum flow MPa 0,025 0,035 0,05
Temperature control at minimum setting
Temperature increase °C 25 25 25
Flow range l/min 4 - 11 4 - 14 4 - 17,6
Min. operating pressure MPa 0,02 0,02 0,02
Minimum pressure for maximum flow MPa 0,06 0,1 0,13
Flue specifications3)
3) For nominal calorific power
Draught requirement MPa 0,0015 0,0015 0,0015
Flow rate g/s 13 17 22
Temperature °C 160 170 180

10
Use
Therm 4200 – 6 720 821 605 (2017/08)
3Use
Open all water and gas blocking devices. 
Purge the pipes.
CAUTION: The area in front of the burner
canreachveryhightemperatures,andthere
is a risk of burning on contact.
3.1 Digital display - description
Fig. 3 Digital display
[1] Temperature/error code
[2] Malfunction indicator
[3] Temperature measurement units
[4] Heater in operation (burner turned on)
3.2 Batteries
Battery insertion
▶ Insert the two 1.5 V R20 batteries.
Fig. 4 Inserting the batteries
Replacing the batteries
The batteries must be changed if the red LED starts flashing.
Fig. 5 Replacing the batteries
Precautions when using the batteries
• Do not dispose of batteries as domestic waste. Take them
to appropriate collecting places for recycling.
• Do not insert flat batteries.
• Only use the type of batteries indicated.
3.3 Before starting up the heater
CAUTION:
▶ The initial startup of the heater must be
realized by a qualified technician, who
will provide the client with all the
information necessary for its correct
usage.
▶ Check if the gas indicated on the type plate is the same as
the one used at the location.
▶ Open the gas valve.
▶ Open the water valve.
3.4 Turning the heater on and off
Turning on
▶ Press the switch , position .
Fig. 6
Green light on = Main burner on