Bosch Therm 8000 S GWHC 27 CTDE Installation And Operating Instructions Manual
Installation and operating instructions
Condensing Gas Water Heater
Therm 8000 S
6 720 680 174 (2012/09) ZA
Read installation manual prior to installation of this unit!
Read user manual before putting this unit in operation!
Observe the warnings in the manuals!
The installation room must fulfill the ventilation requirements!
Installation by an authorised person only!
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Tel: (011) 646 9439
Cell: (082) 452 4488
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6 720 680 174 (2012/09) Therm 8000 S
2 | Index
Index
1 Safety information and symbology . . . . . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety information . . . . . . . . . . . . . . . . . . . . . 3
2 Technical Characteristics and Dimensions . . . . . . . 4
2.1 Declaration of conformity with relevant EEC
regulations . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.2 Explanation of Model Code . . . . . . . . . . . . . . 4
2.3 Package contents . . . . . . . . . . . . . . . . . . . . . 4
2.4 Description of the heater . . . . . . . . . . . . . . . 4
2.5 Optional accessories . . . . . . . . . . . . . . . . . . . 4
2.6 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.7 Appliance overview . . .
. . . . . . . . . . . . . . . . . 6
2.8 Electrical diagram . . . . . . . . . . . . . . . . . . . . . 7
2.9 Technical data . . . . . . . . . . . . . . . . . . . . . . . . 8
2.10 Operational instructions . . . . . . . . . . . . . . . . 9
3 Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Description LCD Display . . . . . . . . . . . . . . . 10
4.2 Before operating the appliance . . . . . . . . . 10
4.3 Connect and disconnect the appliance . . . 11
4.4 Water temperature setting . . . . . . . . . . . . . 11
4.5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.6 Registration of remote control
(accessory nº 7 709 003 756) . . . . . . . . . 11
4.7 Remote control operation
(accessory nº 7 709 003 756) . . . . . . . . . 12
4.8 Program button . . .
. . . . . . . . . . . . . . . . . . . 13
4.9 "Priority" function . . . . . . . . . . . . . . . . . . . . 13
4.10 Purge the appliance . . . . . . . . . . . . . . . . . . 13
4.11 Reset button . . . . . . . . . . . . . . . . . . . . . . . . 13
4.12 Locked condition . . . . . . . . . . . . . . . . . . . . . 14
5 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Important remarks . . . . . . . . . . . . . . . . . . . 15
5.2 Selection of location for installation . . . . . . 15
5.3 Minimum distances . . . . . . . . . . . . . . . . . . . 15
5.4 Installation of xing bracket . . . . . . . . . . . . 16
5.5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.6 Water connection . . . . . . . . . . . . . . . . . . . . 17
5.7 Connecting the condensate wat
er
drain to the appliance . . . . . . . . . . . . . . . . . 18
5.8 Gas connection . . . . . . . . . . . . . . . . . . . . . . 18
5.9 Installation of the exhaustion accessory and
admission of air . . . . . . . . . . . . . . . . . . . . . .19
5.10 Filling the condensate trap . . . . . . . . . . . . . 20
6 Admission / exhaustion accessories
(accessory Ø 80/125 mm) . . . . . . . . . . . . . . . . . . . . .22
6.1 Admission/exhaustion accessories
(diameter in mm) . . . . . . . . . . . . . . . . . . . . .22
6.2 Fitting instructions . . . . . . . . . . . . . . . . . . . 23
6.3 Explanation of Symbols on
Fitting Diagrams . . . . . . . . . . . . . . . . . . . . . .23
6.4 Approved ue systems . . . . . . . . . . . . . . . . 24
7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 Connection . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Power cable . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3 Position of the fuses in control unit . . . . . . 28
8 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 28
8.1 Factory regulations . . . . . . . . . . . . . . . . . . . 28
8.2 Measuring gas pressure . . . . . . . . . . . . . . . 29
8.3 Adjusting CO2 (carbon dioxide) . . . . . . . . 29
8.4 Program values . . . . . . . . . . . . . . . . . . . . . . 32
8.5 Control board diagnostics . . . . . . . . . . . . . 33
8.6 Fan speed adjustment . . . . . . . . . . . . . . . . 33
9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Periodic maintenance tasks . . . . . . . . . . . . 37
9.2 Verify the fuses in the control board . . . . . 38
9.3 Condensing heat exchanger unit . . . . . . . . 38
9.4 Startup after maintenance . . . . . . . . . . . . . 40
10 Problem solving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.1 Problem/Cause/Solution . . . . . . . . . . . . . . 41
11 Functional scheme . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12 Environmental protection . . . . . . . . . . . . . . . . . . . . 46
13 Warranty Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6 720 680 174 (2012/09)Therm 8000 S
Safety information and symbology | 3
1 Safety information and symbology
1.1 Key to symbols
Warnings
Keywords indicate the seriousness of the hazard in terms of the
consequences of not following the safety instructions.
• NOTICE indicates that material damage may occur.
• CAUTION indicates that minor to medium injury may occur.
• WARNING indicates that serious injury may occur.
• DANGER indicates possible risk to life.
Important information
Additional symbols
1.2 Safety information
If you smell gas:
B Close the gas valve.
B Open the windows.
B Do not operate any electrical appliances or switches (on/
o).
B Extinguish any re.
B Go to a dierent location and call the gas supplier or an
authorised technician.
If you smell combustion gases:
B Turn o the heater (página 11).
B Open doors and
windows.
B Notify a gas tter.
Installation, modications
B The installation may only be carried out by registered
installers and shall comply with the requirements of SANS
10087-1.
B The appliance must be installed along with
a low-pressure gas regulator.
B The assembly and modications during the installation of
the heater can only be performed by an authorised installer.
B Do not modify the pipes which conduct combustion gases.
B Do not close or reduce air circulation vents.
Maintenance
B We reccomend to have the system regularly serviced in
order to ensure that it functions reliably and safely.
B The installer is responsible for the safety and environmental
compatibility of the installation.
B The heater must be serviced annually.
B Only original spare parts must be used.
Explosive an
d highly inammable material
B Do not store or use inammable material (paper, solvents,
paints, etc) near the heater.
Combustion air and surrounding air
B To avoid corrosion, the combustion air and surrounding air
must be free from harmful substances (e.g. halogenated
hydrocarbons which contain chlorine and uorine
compounds).
Information to the client
B Inform the client about how to operate and handle the
heater.
B This appliance is not intended for use by persons (including
children) with lack of experience and knowledge, unless
they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety.
Children should be supervised to ensure they do not play
with the appliance.
B Caution clients against performing modications or repairs
themselves.
Warnings in this document are framed and
identied by a warning triangle which is
printed on a grey background.
Electrical hazards are identied by a
lightning symbol surrounded by a warning
triangle.
Important information in cases where there
is no risk of personal injury or material
losses is identied by the symbol shown on
the left. It is bordered by horizontal lines
above and below the text.
Symbol Meaning
B a step in an action sequence
a reference to a related part in the document or
to other related documents
• a list entry
– a list entry (second level)
Table 1
6 720 680 174 (2012/09) Therm 8000 S
4 | Technical Characteristics and Dimensions
2 Technical Characteristics and Dimensions
2.1 Declaration of conformity with relevant EEC
regulations
This appliance fullls European directive requirements
90/396/EEC, 92/42/EEC, 73/23/EEC, 89/336/EEC and
corresponds to the specications described in the
corresponding EEC certicate of proof.
2.2 Explanation of Model Code
[GWH]Gas water heater
[C] Condensing
[27] Capacity (Liter per minute)
[C] Room sealed box
[T] Thermostatic
[D] LCD
[E] Electric ignition
[23] Appliance adjusted for Natural Gas
[30] Appliance adjusted for LPG
2.3 Package contents
• Gas heater
• Support elements
• Heater documentation
2.4 Description of the heater
• Heater for wall-mounting
• High power pre-mix compact burner with low NOx emissions
• Modulating Gas Valve with constant gas:air ratio control
• LCD panel with back light
• Failure codes for easy diagnostics and repair
• Electronic ignition
• Modulating water valve:
– Cold water temperature sensor
– Water ow sensor
• Hot water temperature sensor
• Safety devices:
– Flame failure device (ionization ame rod sensor)
– Back ow temperature sensor
– Inlet temperature sensor
– Outlet temperature sensor
– Room sealed box temperature sensor
– Over heat prevention (temperature limiter)
• Power supply: 230 V, 50 Hz
• IP X4 (protection against water drops)
2.5 Optional accessories
• Gas conversion kit (NG)
– Code nº 8 719 002 460
• Freeze prevention kit
– Code nº 7 709 003 709
• Outdoor kit
– Code nº 7 709 003 732
• Cascading kit
– Code nº 7 736 500 272
• Wireless remote control to operate with the appliance
– Code nº 7 709 003 756
• High temperature kit
– Code nº 7 736 500 605
Model GWHC 27 CTD E
Category II
2H3B
Type C
Table 2
GWHC 27 C T D E 23 30
Table 3
6 720 680 174 (2012/09)Therm 8000 S
Technical Characteristics and Dimensions | 5
2.6 Dimensions
Fig. 1
[1] Front cover
[2] Key pad
[3] Cold water inlet: Ø 3/4 “
[4] Gas connection: Ø 3/4 “
[5] Hot water outlet: Ø 3/4 “
[6] Support bracket
6720608948-14.2Av
131
140140
2
1
452
577
285,8
131
131166
52
07
061
45
3
406
230
6
507
7
6 720 680 174 (2012/09) Therm 8000 S
6 | Technical Characteristics and Dimensions
2.7 Appliance overview
Fig. 2
[1] Air admission adaptor (not included)
[2] Condensing Heat Exchanger
[3] Heat exchanger
[4] Primary fan (Mixer)
[5] Control unit
[6] Flue Gas Adaptor (not included)
[7] Room sealed box temperature sensor
[8] CO
2
/ Co measuring point
[9] Exhaust temperature sensor
[10] Over heat prevention (temperature limiter)
[11] Observation window
[12] Ignition electrodes
[13] Backow temperature sensor
[14] Ionization sensor
[15] Secondary air fan
[16] Pressure point gas valve
[17] Gas valve
[18] Key pad
6720608948-06.1AL
2
1
4
5
3
7
6
9
11
12
13
14
15
16
17
18
10
8
6 720 680 174 (2012/09)Therm 8000 S
Technical Characteristics and Dimensions | 7
2.8 Electrical diagram
Fig. 3 Electrical scheme
[1] Intlet water temperature sensor
[2] Outlet water temperature sensor
[3] Backow temperature sensor
[4] Cascading output connection
[5] Cascading input connection
[6] Ionization sensor
[7] Water ow sensor
[8] Room sealed box temperature sensor
[9] Heat exchanger overheat sensor (104°C)
[10] Gas valve
[11] Exhaust temperature sensor
[12] Water valve
[13] Primary fan
[14] ON/OFF switch
[15] Secondary fan
[16] AC plug
[17] Main connection
[19] Ground post
[20] Antifreeze kit connection
[21] Fuse
[22] Fuse
20 ... 1
16 ... 1
JP5
JP6
JP7
JP8
JP2
M
PS
M
M
E
FS
T=104°C
T=110°C
2
1
4
5
6
7
9
10
12
1315
16
20
19
18
21
22
17
14
8
3
67206089
17-02.1AL
L N
11
T=90°C
6 720 680 174 (2012/09) Therm 8000 S
8 | Technical Characteristics and Dimensions
2.9 Technical data
Technical characteristics Symbol Units GWHC 27 CTDE
Power and ow
nPrewop lufesu lanimoN kW (Btu/h) 47 (160 370)
nimPrewop lufesu muminiM kW (Btu/h) 6 (20 475)
Useful power (adjustment range) kW 6 - 47
nQwolf lamreht lanimoN kW (Btu/h) 48,4 (165 295)
nimQwolf lamreht muminiM kW (Btu/h) 6 (20 475)
Gas data
Supply pressure
03G)enatuB( GPL kPa 3,0
02Gsag larutaN kPa 2,0
Consumption
03G)enatuB( GPL kg/h 3,8
02Gsag larutaN m3/h 5,1
Water data
wperusserp elbissimrep mumixaM bar 12
nimwperusserp gnitarepo muminiM bar 0,3
Minimum activation ow l/min 1,9
Maximum water ow with temperature rise of 25°C l/min 27
Combustion products contents - DIN 4705
Exhaust gas ow
LPG - Butane kg/h 79,3
Temperature of gases at extractor grill
Exhaust temperature at maximum power 56C°
Exhaust temperature at minimum power 82C°
General Data
Voltage 032V
Frequency 05zH
Maximum power consumption W 116
Type of protection IP X4D
Ambient temperature permited °C 0 - 50
Noise db (A) 59
Eciency 001%
Weight (excluding packaging) 43gk
Table 4
6 720 680 174 (2012/09)Therm 8000 S
Regulation | 9
2.10 Operational instructions
Hot water
Open the gas and water valves and ensure that all joints are
hermetic.
Place the principle switch (Fig. 4 , pos. 1) in the operating
position (chapter 4.3), so that the appliance is quickly ready
for use.
When a hot tap is opened, the water ow sensor should be in
(Fig. 2 , pos. 2) send a signal to the control unit. This signal
initiates the following:
• The fan starts working
• Simultaneously, sparks are produced and the gas valve
opens.
• The burner lights
• The ionisation electrode controls the state of the ame.
• The water temperature is controlled automatically by the
sensors/controllers according to the temperature selected.
Security cut-o when safety period is surpassed
If a ame is not achieved within the stipulated security perio
d
(35 sec), a security cut-o will occur, see .
The presence of air in the gas inlet pipe (when the appliance is
used after long periods of inactivity for example) may delay
ignition.
In this case, if the attempts to ignite go on too long, the security
mechanisms prevent operation.
Security cut-o due to excessive water heating
The control unit detects the heating temperature via a NTC
resistor located in the hot water exit tube and the temperature
limiter located in the heat exchanger. If it detects an excessive
temperature it provokes a security cut-o.
Restarting after security cut-o
To restart the appliance following a security cut-o:
B Press the reset key (Fig. 19 ).
3 Regulation
Any local by-laws and regulations pertaining to installation and
use of gas-heated appliances must be observed. Please refer to
the laws that should be attended in your country.
4 Operating instructions
Fig. 4
[1] Main switch ON/OFF
[2] Reset key
[3] Program key
[4] LCD panel
[5] Temperature increase key/ programming key
[6] Temperature decrease key / programming key
[7] LED
The installation may only be carried out by
registered installers and shall comply with
the requirements of SANS 10087-1.
6 720 680 174 (2012/09) Therm 8000 S
10 | Operating instructions
4.1 Description LCD Display
Fig. 5 Power bar indicator (input)
Fig. 6 Temperature indicator
Fig. 7 Error indicator
Fig. 8 Locked condition indicator (only with remote control)
Fig. 9 Flame indicator
Fig. 10 Solar mode indicator
Fig. 11 Remote control indicator
4.2 Before operating the appliance
B Conrm that the gas type of the heater matches the gas
supply you will be connecting the heater.
B Open gas valve.
CAUTION:
Do not use any cleaning agressive or
corrosive agents to clean the window.
-
CAUTION:
B 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 for gas leaks at all joints.
6 720 680 174 (2012/09)Therm 8000 S
Operating instructions | 11
B Open water valve.
4.3 Connect and disconnect the appliance
Connect
B To start the appliance press the On/O button.
Fig. 12
Disconnect
B To shut down the appliance press the On/O button again.
4.4 Water temperature setting
To regulate the emitted water temperature:
B Press the or until the desired value is obtained.
Fig. 13
B Once the desired temperature is set, open the hot water tap.
4.5 Operation
Turn ON the main swicth and the appliance is ready to work.
B When a hot water tap is opened, main burner ignites and
LCD displays indication .
Fig. 14
4.6 Registration of remote control (accessory nº 7
709 003 756)
Only a qualied technician is allowed to install the aditional
PCB that is supplied with the remote. Only after installation of
PCB the registration can be made.
The registration of the remote control must be done near the
appliance.
Hot water tap closed.
Turn OFF the appliance (Fig. 4 , pos.1).
B Press and hold the programming key (Fig. 4 , pos.3), press
ON/OFF button(Fig. 4 , pos. 1) to connect the appliance.
Release programming key only when LCD displays “188”
The LCD displays the signal "P2".
B Press key , until it displays the signal "P3".
B Press programming key again for about 1 second.
LCD panel displays one number and one rotating digit.
The number represents the remote control which is to be
registered, the rst remote control will be registered with
number “0”,
the second with number “1” and so on.
Check for water leaks at all joints.
The temperature value indicated on the LCD
panel corresponds to the water temperature
at the appliance outlet.
These appliance has an electronically
controlled gas valve that modulates the
burner input in response to both varying hot
water ow rates and/or changes in any
incoming and outgoing water temperatures.
LCD ashes until selected temperature is
reached.
6720608920-35.1AL
6 720 680 174 (2012/09) Therm 8000 S
12 | Operating instructions
B Test the remote control in front of the electronic box by
simultaneously pressing the and control keys.
Fig. 15 Activate new control
B Press both keys until the LCD panel stops ashing and
shows the indication “00”.
B Press ON/OFF button(Fig. 4 , pos. 1) to disconnect the
appliance .
Remote control is now deactivated.
4.7 Remote control operation (accessory nº 7 709
003 756)
This appliance fullls European directive requirements 1999/
5/CEE (R&TTE) and corresponds to the specications
described in the cor-responding CE certicate of proof.
B Press buttons and in order to reach requested
temperature.
Fig. 16 Remote control (temperature selection)
Batteries replacement
B Remove the 2 screw from the remote control back.
B Open the cover.
B Remove the old batteries an
d correctly place the new ones.
B Close the remote control assuring that both screws are
tighten screwed.
Precautions when using the batteries
• Do not dispose of batteries as domestic waste. Take them to
appropriate collecting places for recycling.
• Do not insert at batteries.
• Only use the type of batteries indicated.
Press the ON/OFF button to turn ON the
remote control and it’s ready to work.
NOTE: up to 6 remote controls can be
programmed for one single water heater,
each with a range distance of 30m.
CAUTION:
remote control is not a toy - do not allow
children to play with the remote control unit.
CAUTION:
remote control can be used under the
shower , however, it’s immersion must
not be forced .
6 720 680 174 (2012/09)Therm 8000 S
Operating instructions | 13
4.8 Program button
Program button can be used/programed in the appliance and in
the remote control.
Programing "Program" function
Fig. 17 "Program" key
B Press buttons and to select temperature
to be memorized.
B Press "Program" button for 3 seconds to save temperature.
The temperature is saved on "Program" when the LCD panel
stops blinking.
Using "Program" function
In order to select memorized temperature:
B Press "Program" key.
LCD shows pre-memorized temperature, which is now the
selected hot water temperature.
4.9 "Priority" function
The appliance does not have a designated default priority.
Pri
ority is attributed when the rst user selects a temperature
(see chapter 4.4).
The following symbol appears for other users .
The priority user may change the initial selection at any time.
Non-priority users cannot change the selection made by the
priority user.
The system resets priority function 5 minutes after last water
demand, returning to the initial state.
To select priority
Any user may select temperature selection priority in the
following manner:
B Press one of the selection keys or for 5 seconds.
4.10 Purge the appliance
If there is a risk of freezing, proceed as follows:
B Close the cold water valve of the water heater.
B Open hot water taps to drain the water heater.
B Re
move all the water contained inside of the appliance.
4.11 Reset button
If the LCD shows the error symbol do not shut o power
or unplug the heater. Follow instructions below to reset error
rst.
Record the error code on LCD and consult chapter 10 to
identify the error.
Each remote control program button can
be programed with dierent temperature
values according with the user needs. A
temperature value can be programmed in
the remote control and another value in the
appliance.
PRIORITY is a function to prevents the user
from accidentally altering the water
temperature selected by another user.
Program
6720608920-32.1AL
Priority cannot be selected when the
appliance is working.
CAUTION:
The non accomplishment of the purgative of
the appliance whenever the freezing risk
exists, it can damage components of the
appliance.
If the appliance is installed in places where
freezing risk exists the accessory antifreezing should be used, cod. 7 709 003
709.
This appliance has a error codes system. The
visualization of these codes is made through
the LCD display. (Fig. 4 , pos. 4).
6 720 680 174 (2012/09) Therm 8000 S
14 | Installation instructions
Fig. 18 Error code
After following instructions indicated in “Troubleshooting”
section,
B press reset button rmly in order to return heater to normal
operation.
Fig. 19 Reset button
If the problem persists, contact your installer.
4.12 Locked condition
This condition is only valid for appliances with one or more
remote controls installed.
Fig. 20 Locked condition
Whenever LCD shows the temperature setting cannot
be adjusted because the appliance is in use by a user which
already selected a dierent temperature. Appliance will be
automatically unlock 5 minutes after closing hot water tap.
5 Installation instructions
DANGER: Explosion
B Always close the gas valve before doing
any work in gas components.
The installation, the electric connection, the
gas installation, the installation of the
exhaustion / admission conducts, as well as
the start up must be carried out by a qualied
technician.
The appliance can only be used in the
countries mencioned in the type plate.
CAUTION:
B Do not install the appliance where the
inlet water temperature is superior to
60°C. In such cases we recommended the
installation of a mixer's valve in the
entrance of the appliance as prevention
measure.
6720608920-33.1AL
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