Worcester GREENSPRING CWi47 User manual

INSTALLATION AND OPERATING INSTRUCTIONS
WALL HUNG RSF GAS CONDENSING INSTANTANEOUS WATER HEATER
GREENSPRING CWi47
6720646322-00.1V
FOR MAINS FED DOMESTIC HOT WATER
6 720 646 322 (2012/05) GB

TABLE OF CONTENTS
6 720 646 322 (2012/05)
2
TABLE OF CONTENTS
1 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . 3
1.2 Safety information . . . . . . . . . . . . . . . . . . . 3
2 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 APPLIANCE INFORMATION . . . . . . . . . . . . . . . . 6
3.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Declaration of conformity with relevant
EEC regulations . . . . . . . . . . . . . . . . . . . . . 6
3.3 Explanation of Model Code . . . . . . . . . . . . 6
3.4 Package contents . . . . . . . . . . . . . . . . . . . 6
3.5 Description of the heater . . . . . . . . . . . . . 6
3.6 Optional accessories . . . . . . . . . . . . . . . . . 6
3.7 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 7
3.8 LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.9 CIRCUIT diagram . . . . . . . . . . . . . . . . . . . . 9
3.10 Technical data . . . . . . . . . . . . . . . . . . . . . 10
3.11 Operational instructions . . . . . . . . . . . . . 11
4 Installations examples . . . . . . . . . . . . . . . . . . . 12
4.1 Single unit without secondary return . . . 12
4.2 Single unit with secondary return . . . . . . 12
4.3 Multiple units without secondary return . 13
4.4 Multiple units with secondary return . . . 13
5 Operating instructions . . . . . . . . . . . . . . . . . . . 14
5.1 LCD Display . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Before operating the appliance . . . . . . . . 15
5.3 SWITCHING THE APPLIANCE ON OR OFF 15
5.4 Water temperature setting . . . . . . . . . . . 15
5.5 Operation . . . . . . . . . . . . . . . . . . . . . . . . 15
5.6 DRAINING DOWN the appliance . . . . . . . 16
5.7 Reset button . . . . . . . . . . . . . . . . . . . . . . 16
5.8 Locked condition . . . . . . . . . . . . . . . . . . 16
6 Installation instructions . . . . . . . . . . . . . . . . . . 17
6.1 GAS SUPPLY . . . . . . . . . . . . . . . . . . . . . . 17
6.2 APPLIANCE LOCATION
AND CLEARANCES . . . . . . . . . . . . . . . . . . 17
6.3 Minimum CLEARANCES . . . . . . . . . . . . . 18
6.4 Installation of fixing bracket . . . . . . . . . . 18
6.5 Installation . . . . . . . . . . . . . . . . . . . . . . . 18
6.6 Water connection . . . . . . . . . . . . . . . . . . 20
6.7 CONDENSATE PIPE WORK . . . . . . . . . . . 20
6.8 Gas connection . . . . . . . . . . . . . . . . . . . . 24
6.9 FLUE OPTIONS . . . . . . . . . . . . . . . . . . . . 25
6.10 Flue installation . . . . . . . . . . . . . . . . . . . . 27
6.11 Filling the condensate trap . . . . . . . . . . . 30
7 FLUE OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.1 FLUE accessories (diameter in mm) . . . . 31
8 Electrical connection . . . . . . . . . . . . . . . . . . . . . 32
8.1 ELECTRICAL SUPPLY . . . . . . . . . . . . . . . . 32
8.2 EQUIPOTENTIAL BONDING . . . . . . . . . . . 32
8.3 Connection . . . . . . . . . . . . . . . . . . . . . . . 32
8.4 Power cable . . . . . . . . . . . . . . . . . . . . . . . 32
8.5 Position of the fuses in control unit . . . . 33
8.6 Installation of Intelligent Cascading Kit . . 34
8.7 Functional requirements FOR CASCADE
SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . .35
9 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.1 Factory regulations . . . . . . . . . . . . . . . . . 36
9.2 Measuring gas pressure . . . . . . . . . . . . . . 37
9.3 Adjusting CO2 (carbon dioxide) . . . . . . . 37
9.4 Program values . . . . . . . . . . . . . . . . . . . . 40
9.5 Appliance cascading mode setting . . . . . 41
9.6 Control board diagnostics . . . . . . . . . . . . 42
9.7 Fan speed adjustment . . . . . . . . . . . . . . . 43
9.8 Registration of remote control . . . . . . . . 44
9.9 Remote control operation . . . . . . . . . . . . 44
9.10 Program button . . . . . . . . . . . . . . . . . . . . 45
9.11 "Priority" function . . . . . . . . . . . . . . . . . . 45
10 SERVICE AND SPARES . . . . . . . . . . . . . . . . . . . 46
10.1 Periodic maintenance tasks . . . . . . . . . . . 46
10.2 Check the fuses in the control board . . . 47
10.3 Condensing heat exchanger unit . . . . . . . 48
10.4 Startup after maintenance . . . . . . . . . . . . 50
11 FAULT FINDING AND DIAGNOSIS . . . . . . . . . . 51
11.1 FAULT FINDING . . . . . . . . . . . . . . . . . . . . 51
12 HOT WATER FUNCTION . . . . . . . . . . . . . . . . . . 55
13 Environmental protection . . . . . . . . . . . . . . . . . 56
14 Greenspring Water Heater GUARANTEE . . . . . 57

KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
6 720 646 322 (2012/05) 3
1 KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
1.1 EXPLANATION OF SYMBOLS
WARNING SYMBOLS
Signal words indicate the seriousness of the hazard in
terms of the consequences of not following the safety
instructions.
•NOTICE indicates possible damage to property or
equipment, but where there is no risk of injury.
•CAUTION indicates possible injury.
•WARNING indicates possible severe injury.
•DANGER indicates possible risk to life.
IMPORTANT INFORMATION
ADDITIONAL SYMBOLS
1.2 SAFETY INFORMATION
PLEASE READ THESE INSTRUCTIONS CAREFULLY
BEFORE STARTING INSTALLATION.
THESE INSTRUCTIONS ARE APPLICABLE TO THE
WORCESTER APPLIANCE MODEL(S) STATED ON THE
FRONT COVER OF THIS MANUAL ONLY AND MUST NOT
BE USED WITH ANY OTHER MAKE OR MODEL OF
APPLIANCE.
THE INSTRUCTIONS APPLY IN THE UK AND IRELAND
ONLY AND MUST BE FOLLOWED EXCEPT FOR ANY
STATUTORY OBLIGATION.
THIS APPLIANCE MUST BE INSTALLED BY A GAS SAFE
REGISTERED, COMPETENT PERSON. FAILURE TO
INSTALL CORRECTLY COULD LEAD TO PROSECUTION.
IF YOU ARE IN ANY DOUBT CONTACT THE WORCESTER
TECHNICAL HELPLINE (0844 693 3028).
DISTANCE LEARNING AND TRAINING COURSES ARE
AVAILABLE FROM WORCESTER.
PLEASE LEAVE THESE INSTRUCTIONS WITH THE
COMPLETED COMMISSIONING CHECKLIST, (OR A
CERTIFICATE CONFIRMING COMPLIANCE WITH EITHER
I.S.813 (Domestic Gas Installation) OR I.S.820 (Non-
Domestic Gas Installation) for, EIRE ONLY) AND THE
USER MANUAL WITH THE OWNER OR AT THE GAS
METER AFTER INSTALLATION OR SERVICING.
THE CHECKLIST CAN BE FOUND IN THE BACK PAGES
OF THE INSTALLATION MANUAL. ABBREVIATIONS USED
IN THIS MANUAL:
IF YOU SMELL GAS:
BCALL NATIONAL GAS EMERGENCY SERVICE ON
0800 111 999 (UK only).
BLPG WATER HEATERS CALL THE SUPPLIER‘S
NUMBER ON THE SIDE OF THE LPG TANK.
BTURN OFF THE ECV (EMERGENCY CONTROL VALVE)
AT THE METER/REGULATOR.
BDO NOT TURN ELECTRICAL SWITCHES ON OR OFF
BDO NOT STRIKE MATCHES OR SMOKE AND PUT OUT
NAKED FLAMES
BOPEN DOORS AND WINDOWS
BKEEP PEOPLE AWAY FROM THE AFFECTED AREA
WATER HEATER OPERATION:
This heater must only be operated by a responsible
adult who has been instructed in, understands, and is
aware of the heater's operating conditions and effects.
Safety instructions in this document are
framed and identified by a warning triangle
which is printed on a grey background.
Electrical hazards are identified by a
lightning symbol surrounded by a warning
triangle.
Notes contain important information in
cases where there is no risk of personal
injury or material losses and are identified
by the symbol shown on the left. They are
bordered by horizontal lines above and
below the text.
Symbol Meaning
Ba step in an action sequence
Æa reference to a related part in the
document or to other related documents
•a list entry
–a list entry (second level)
Tab. 1

KEY TO SYMBOLS AND SAFETY INSTRUCTIONS
6 720 646 322 (2012/05)
4
HEALTH AND SAFETY
The appliance contains no asbestos and no substances
have been used in the construction process that
contravene the COSHH Regulations (Control of
Substances Hazardous to Health Regulations 1988).
COMBUSTION AND CORROSIVE MATERIALS
Do not store or use any combustible materials (paper,
thinners, paints, propellant, cleaning agents etc.) inside
or within the vicinity of the appliance or ventilation grill.
Chemically aggressive substances can corrode the
appliance and invalidate any warranty.
IMPORTANT INFORMATION
BRead installation manual prior to installation of this unit!
BRead user manual before putting this unit in operation!
BObserve the warnings in the manuals!
The installation room must fulfill the ventilation
requirements!
BInstallation by an authorised person only!
FITTING AND MODIFICATIONS
Fitting the appliance and any controls to the appliance
may only be carried out by a competent engineer in
accordance with the current Gas Safety (Installation and
Use) Regulations.
Flue systems must not be modified in any way other than
as described in the fitting instructions. Any misuse or
unauthorised modifications to the appliance, flue or
associated components and systems could invalidate
the warranty. The manufacturer accepts no liability
arising from any such actions, excluding statutory rights.
SERVICING
Advise the user to have the system serviced annually by
a competent, qualified and registered Gas engineer.
Approved spares must be used to help maintain the
economy, safety and reliability of the appliance.
IMPORTANT
The service engineer must complete the Service Record
on the Service Checklist after each service.
INSTALLATION REGULATIONS
Current Gas Safety (Installation & Use) Regulations:
All gas appliances must be installed by a competent
person in accordance with the above regulations. Failure
to install appliances correctly could lead to prosecution.
The appliance must be installed in accordance with, and
comply to, the current: Gas Safety Regulations, IEE
Regulations, Building Regulations, Building Standards
(Scotland) (Consolidation), Building Regulations
(Northern Ireland), local water by-laws, Health & Safety
Document 635 (The Electricity at Work Regulations
1989) and any other local requirements.

STANDARDS
6 720 646 322 (2012/05) 5
2STANDARDS
BRITISH STANDARDS:
Where no specific instruction is given, reference should
be made to the relevant British Standard codes of
Practice.
BS7074:1 Code of practice for domestic and hot water
supply
BS6891 Installation of low pressure gas pipe work up to
28mm (R1)
BS5546 Installation of gas hot water supplies for
domestic purposes
EN12828 Central heating for domestic premises
BS5440:1 Flues and ventilation for gas appliances of
rated heating not exceeding 70kW (net):
Flues
BS5440:2 Flues and ventilation for gas appliances of
rated heating not exceeding 70 kW (net) : Air
Supply
BS6798 Installation of gas fired boilers of rated input up
to 70kW (net)
BS EN 13076:2003 Devices to prevent pollution by
backflow of potable water. Unrestricted air gap.
Family A. Type A
BS EN 13077:2008 Devices to prevent pollution by
backflow of potable water. Air gap with non-circular
overflow (unrestricted). Family A. Type B
BS EN 14623:2005 Devices to prevent pollution by
backflow of potable water. Air gaps with minimum
circular overflow (verified by test or measurement).
Family A, type G
BS6283-4:1991 Safety and control devices for use in hot
water systems. Specification for drop-tight pressure
reducing valves of nominal size up to and including DN
50 for supply pressures up to and including 12 bar.
CP342-2: 1974 Code of practice for centralised hot
water supply. Buildings other than individual dwellings.
INSTALLATIONS OF A RATED INPUT GREATER THAN
70 KW:
BS6644 Specification for Installation of gas-fired hot
water boilers of rated inputs between 70 kW (net) and
1.8 MW (net) (2nd and 3rd family gases).
BSEN15417:2006 Gas-fired central heating boilers.
specific requirements for condensing boilers with a
nominal heat input greater than 70 kW but not exceeding
1000 kW.
BSEN15420 Gas-fired central heating boilers. Type C
boilers of nominal heat input exceeding 70 kW, but not
exceeding 1000 kW.
IGE/UP/2 Gas installation pipework and compressors on
industrial and commercial premises.
IGE/UP/10 Installation of gas appliances in industrial
and commercial premises, part 1: flued appliances.
IRISH STANDARDS
The relevant Irish standards should be followed,
including:
•ECTI National rules for electrical installations
•IS 813:2002 for Domestic Gas Installations.
•IS 820:2000 for Non-Domestic Gas Installations.
LPG INSTALLATIONS
An appliance using L.P.G. must not be installed a room
or internal space below ground level unless one side of
the building is open to the ground.
BS5482 Code of practice for domestic butane and
propane gas burning installations. Installations at
permanent dwellings, residential park homes and
commercial premises, with installation pipework sizes
not exceeding DN 25 for steel and DN 28 for corrugated
stainless steel or copper.
TIMBER FRAMED BUILDING:
Where the heater is to be fitted to a timber framed
building the guidelines laid down in BS5440: Part 1 and
IGE/UP/7 should be adhered to.
POTABLE WATER:
All seals, joints and compounds (including flux and
solder) and components used as part of the secondary
domestic water system must be approved by WRAS.

APPLIANCE INFORMATION
6 720 646 322 (2012/05)
6
3APPLIANCEINFORMATION
3.1 INTENDED USE
The device should only be used to produce hot water for
domestic or commercial uses.
3.2 DECLARATION OF CONFORMITY
WITH RELEVANT EEC REGULATIONS
This appliance fulfills European directive requirements
90/396/EEC, 92/42/EEC, 73/23/EEC, 89/336/EEC and
corresponds to the specifications described in the
corresponding EEC certificate of proof.
3.3 EXPLANATION OF MODEL CODE
WGas water heater
TThermostatic
DLCD
27 Capacity (Liter per minute)
ARoom sealed box
MFan assisted
EElectric ignition
23 Appliance adjusted for natural gas
31 Appliance adjusted for LPG
SCountry code (S0505 - UK/IE)
3.4 PACKAGE CONTENTS
•Instantaneous Water Heater
•Fixing kit
•Documentation
•Gas Isolation Valve
•Water Inlet Isolation Valve with in-line filter
•Water connection pipes (2 off)
•Flue gasket
3.5 DESCRIPTION OF THE HEATER
•Water heater for wall-mounting
•High output pre-mix compact burner with low NOx
emissions
•Modulating fan with constant gas:air ratio control
•LCD panel with back light
•Real time fault diagnostics
•Fault codes for easy diagnostics and repair
•Electronic ignition
•Modulating water valve:
–Cold water temperature sensor
–Water flow sensor
•Hot water temperature sensor
•Built in frost protection
•Safety devices:
–Flame failure device (ionization flame sensor)
–Flue gas recirculation temperature sensor
–Inlet temperature sensor
–Outlet temperature sensor
–Flue gas overheat sensor
–Heat exchanger overheat sensor
•Power supply: 230 V, 50 Hz
•IP X4 (protection against water drops)
3.6 OPTIONAL ACCESSORIES
•Cascading kit
–Part number: 7 736 500 272
•Wireless remote control (Master)
–Part number: 7 736 500 569
•Wireless remote control (Additional)
–Part number: 7 736 500 699
Models WTD 27 AM E23 S0505
WTD 27 AM E31 S0505
Category II2H3P
Type B23, C13, C33, C43, C53, C83
Tab. 2
WTD 27 AME 23
31
S..
Tab. 3

APPLIANCE INFORMATION
6 720 646 322 (2012/05) 7
3.7 DIMENSIONS
Fig. 1
1Front cover
2Controller
3Cold water inlet: Ø 3/4" (supplied loose with 22mm copper
pipe with 3/4" connection nut and a 22mm isolation valve
incorporating filter)
4Gas connection: Ø 3/4 “ (isolating valve supplied loose)
5Hot water outlet: Ø 3/4" (supplied loose with 22mm copper
pipe with 3/4" connection nut)
6Wall mounting bracket
7Condensate outlet Ø 32mm
2
1
6720608917-01.2Av
452
775
285,8
131
131166 52
70
160
131
140140
406
230
6
705
45 3 7

APPLIANCE INFORMATION
6 720 646 322 (2012/05)
8
3.8 LAYOUT
Fig. 2
1Condensing heat exchanger
2Heat exchanger
3Primary fan
4Hot water temperature sensor
5Control unit
6Flue gas overheat sensor
7Flue gas temperature sensor
8Heat exchanger overheat thermostat
9Frost protection
10 Sight glass
11 Ignition electrodes
12 Flue recirculation temperature sensor
13 Ionization sensor
14 Secondary fan
15 Pressure test point gas valve
16 Gas valve
17 Water valve with flow sensor and cold water temperature
sensor
18 Controller with LCD display
6720646322-04.1V
9
1
2
3
5
4
8
7
10
11
16
6
17
12
13
14
15
18

APPLIANCE INFORMATION
6 720 646 322 (2012/05) 9
3.9 CIRCUIT DIAGRAM
Fig. 3 Electrical scheme
1Intlet water temperature sensor
2Outlet water temperature sensor
3Flue gas recirculation temperature sensor
4Cascade kit output connection
5Cascade kit input connection
6Ionization sensor
7Water flow sensor
8Flue gas overheat sensor
9Heat exchanger overheat thermostat (104°C)
10 Gas valve
11 Flue gas temperature sensor
12 Water valve
13 Primary fan
14 ON/OFF switch
15 Secondary fan
16 Power supply cable
17 Mains power connection terminal
18 Ignition electrodes
19 Earth bonding
20 Frost protection connection
21 Fuse (2,5A)
22 Fuse (1,6A)
20 ... 1
20 ... 1
16 ... 1
16 ... 1
JP5 JP6
JP7 JP8
JP2
MPS
M
ME
FS
T=104°C
T=110°C
2
1
4
5
6
7
9
10
12
13
15
16
20
19
18
21
22
17
14
8
3
6720608917-02.1AL
L N
11
T=90°C

APPLIANCE INFORMATION
6 720 646 322 (2012/05)
10
3.10 TECHNICAL DATA
Technical characteristics Symbol Units CWi47
Power and flow
Nominal output Pn kW 50.3
Minimum output Pmin kW 6
Output (adjustment range) 6 - 50.3
Nominal input Qn kW 48.4
Minimum input Qmin kW 6
Gas data
Supply pressure
Natural gas G20 mbar 20
LPG (propane) G31 mbar 37
Gas consumption
Natural gas (Hi = 9,5 kWh/m3) G20 m3/h 5.09
LPG (propane) (Hi = 12,8 kWh/kg) G31 kg/h 3.8
Water data
Maximum permissible pressure pw bar 12
Minimum operating pressure pwmin bar 0.3
Minimum activation flow l/min 1.9
Maximum water flow with temperature rise of 35°C l/min 20.6
Minimum water pressure for maximum water flow bar 2.5
Combustion products
Flue gas flow
Natural gas kg/h 81.8
LPG - Propane kg/h 79.3
Temperature of combustion gases
Flue gas temperature at maximum output °C 60 - 70
Flue gas temperature at minimum output °C 29
General Data
Efficiency at nominal input %104
Voltage V230
Frequency Hz 50
Maximum electrical power consumption W116
Type of protection IP X4D
Ambient temperature permited °C 0 - 50
NET efficiency %104
Weight (excluding packaging) kg 34
Tab. 4

APPLIANCE INFORMATION
6 720 646 322 (2012/05) 11
3.11 OPERATIONAL INSTRUCTIONS
HOT WATER
Open the gas and water valves and ensure that all joints
are tight.
Place the on-off switch (Fig. 8, pos. 1) in the operating
position (chapter 5.3), so that the appliance is ready for
use.
When a hot water tap is opened, the water flow sensor
will send a signal to the control unit. This signal initiates
the following:
•The fan starts.
•Spark generator provides a spark at the burner and
then the gas valve opens.
•The burner ignites.
•The ionisation electrode ensures the flame is present.
•The water temperature is controlled automatically by
the sensors/controllers according to the temperature
selected.
SAFETY CUT-OFF WHEN SAFETY PERIOD IS
SURPASSED
The appliance attempts three starts before it safety
circuit locks out. A single start attempt lasts 5 seconds
followed by a 5 second break before having a new
attempt. The start up cycle will last a maximum of 35
seconds before the appliance locks out on flame failure.
In this case, if the attempts to ignite go on too long, the
security mechanisms prevent operation.
SAFETY CUT-OFF DUE TO EXCESSIVE WATER
HEATING
The control unit detects the water temperature via a NTC
sensor located in the hot water flow pipe and the
temperature sensor located in the heat exchanger. If it
detects an excessive temperature it provokes a safety
cut-off.
RESTARTING AFTER SAFETY CUT-OFF
To restart the appliance following a safety cut-off:
BPress the reset key (Fig. 8, pos. 2).

INSTALLATIONS EXAMPLES
6 720 646 322 (2012/05)
12
4 INSTALLATIONS EXAMPLES
4.1 SINGLE UNIT WITHOUT SECONDARY RETURN
Fig. 4
1Gas supply
2Cold mains inlet
3Water isolation valve (supplied with appliance)
4DHW flow
5Gas isolation valve (supplied with appliance)
6DHW outlets
10 Non return valve
4.2 SINGLE UNIT WITH SECONDARY RETURN
Fig. 5
1Gas supply
2Cold mains inlet
3Water isolation valve (supplied with appliance)
4DHW flow
5Gas isolation valve (supplied with appliance)
6DHW outlets
7Strainer
8Pressure reducing valve
9Expansion vessel
10 Non return valve
11 Pressure relief valve
12 Secondary circulation pump
2
1
4
6720646322-16.1V
6
3
5
10
6720646322-17.1V
1
2
3710
4
9
6
11
12
8
10
5

INSTALLATIONS EXAMPLES
6 720 646 322 (2012/05) 13
4.3 MULTIPLE UNITS WITHOUT SECONDARY RETURN
Fig. 6
1Gas supply
2Cold mains inlet
3Water isolation valve (supplied with appliance)
4DHW flow
5Gas isolation valve (supplied with appliance)
6DHW outlets
10 Non return valve
13 Cascading kit (part number 7 736 500 272)
4.4 MULTIPLE UNITS WITH SECONDARY RETURN
Fig. 7
1Gas supply
2Cold mains inlet
3Water isolation valve (supplied with appliance)
4DHW flow
5Gas isolation valve (supplied with appliance)
6DHW outlets
7Strainer
8Pressure reducing valve
9Expansion vessel
10 Non return valve
11 Pressure relief valve
12 Secondary circulation pump
13 Cascading kit (part number 7 736 500 272)
2
1
4
6720646322-18.1V
613
5
3 10
3
5
1
6
6720646322-19.1V
12
4
2
7
9
10 8
11
13
55
3
10
3

OPERATING INSTRUCTIONS
6 720 646 322 (2012/05)
14
5 OPERATING INSTRUCTIONS
Fig. 8
1Main ON/OFF button
2Reset button
3Program button
4LCD display
5Temperature increase key/ programming button
6Temperature decrease key / programming button
7LED
5.1 LCD DISPLAY
Fig. 9 Power bar indicator (input)
Fig. 10 Temperature indicator
Fig. 11 Error indicator
Fig. 12 Locked condition indicator (only with remote
control)
Fig. 13 Flame indicator
Fig. 14 Solar mode indicator
Fig. 15 Remote control indicator
2
3
15
4
6
7
6720608920-10.1AL
Do not use any aggressive cleaning agents to
clean the display.
6720608920-31.1AL

OPERATING INSTRUCTIONS
6 720 646 322 (2012/05) 15
5.2 BEFORE OPERATING THE APPLIANCE
BConfirm that the gas type of the heater matches the
gas supply you will be connecting the water heater.
BOpen gas isolating valve.
BOpen water isolating valve.
5.3 SWITCHING THE APPLIANCE ON OR
OFF
CONNECT
BTo start the appliance press the On/Off button.
Fig. 16
SWITCHING OFF
BTo switch off the appliance press the On/Off button
again.
5.4 WATER TEMPERATURE SETTING
Factory default temperature set point: 42 °C.
To regulate the water temperature:
BPress the or buttons until the desired value
is set.
Fig. 17
BOnce the desired temperature is set, open the hot
water tap.
5.5 OPERATION
Turn ON the main switch and the appliance is ready to
work.
BWhen a hot water tap is opened, main burner ignites
and LCD displays indication .
Fig. 18
CAUTION:
BThe initial startup of the water heater
must be carried out by a qualified and
registered gas installer, who will provide
the client with all the information
necessary for its correct operation.
Check all joints for gas leaks.
Check all joints for water leaks.
6720608920-11.1AL
The temperature value indicated on the LCD
panel corresponds to the temperature
taken as the water leaves the appliance.
This appliance has an electronically
controlled gas valve that modulates the
burner input in response to both varying
hot water flow rates and/or changes in
any incoming and outgoing water
temperatures.
LCD flashes until selected temperature is
reached.
+
6720608920-12.1AL
6720608920-22.1AL

OPERATING INSTRUCTIONS
6 720 646 322 (2012/05)
16
5.6 DRAINING DOWN THE APPLIANCE
If there is a risk of freezing, proceed as follows:
BClose the cold water valve of the water heater(s).
BOpen hot water taps to drain the water heater(s).
BRemove all the water contained inside of the
appliance.
5.7 RESET BUTTON
If the LCD shows the error symbol do not shut off
power or unplug the water heater. Follow instructions
below to reset the error first.
Record the error code on LCD and consult chapter 11 to
identify the error.
Fig. 19 Error code
After following instructions indicated in
“Troubleshooting”. Æchapter 11.
BPress reset button firmly in order to return the water
heater to normal operation.
Fig. 20 Reset button
If the fault remains and cannot be cleared by pressing
the reset button, contact Worcester, Bosch Group for
assistance.
5.8 LOCKED CONDITION
This condition is only valid for appliances with one or
more remote controls installed.
Fig. 21 Locked condition
Whenever LCD shows the temperature setting
cannot be adjusted. In this case, the appliance is being
operated by the remote control which has already set an
output temperature. Appliance will be unlocked
automatically, 5 minutes after closing hot water tap.
CAUTION:
To avoid damage to the appliance care
should be taken not to install the water
heater where there is a risk of freezing
conditions.
The internal frost protection is designed to
provide protection for the water heater
down to approximately -10 °C for short term
conditions only. It will not protect the
appliance in areas where the temperature is
frequently expected to be below freezing.
- The frost protection will not protect the
installation outside the appliance from
freezing. Suitable measures should be taken
to protect the installation against frost
damage.
This appliance has an error code system.
These codes are shown on the LCD display.
(Fig. 8, pos. 4).
6720608920-14.1AL
6720608920-15.1AL
6720608920-21.1AL

INSTALLATION INSTRUCTIONS
6 720 646 322 (2012/05) 17
6 INSTALLATION INSTRUCTIONS
6.1 GAS SUPPLY
Appliances using Natural Gas (NG) must be connected
to a governed meter.
BLiquid Petroleum Gas (LPG) must be connected to a
regulator.
BInstallation and connection of the gas supply to the
water heater must be in accordance with the relevant
gas regulations (page 5).
BUnder no circumstance should be size of the gas
supply pipe be less than 22 mm.
BThe meter or regulator and pipe work to the meter
must be checked, preferably by the gas supplier.
This is to ensure that the equipment is in good
working order and can meet the gas flow and
pressure requirements, in addition to the demand
from any other appliance being served.
BEnsure that the flow and pressures for the regulator
installed are those indicated for the consumption of
the appliance (see technical data in table 4).
6.2 APPLIANCE LOCATION AND
CLEARANCES
CONSIDERATIONS RELEVANT TO LOCATION
BThis appliance must be installed at a suitable location
onto a fixed, rigid vertical surface at least the same
size as the appliance and capable of supporting the
appliance weight.
BThe heater must not installed above a source of heat.
BObserve the minimum installation measurements
indicated in Fig. 22.
BThe appliance must not be installed in sites where the
ambient temperature is expected to drop below 0°C.
Where there is a risk of freezing, disconnect and drain
the appliance (Æchapter 5.6).
BEnsure that a fused spur exists at the place were the
appliance will be installed.
BEnsure that condensate can be drained.
VENTILATION
BVentilation needs to comply with the current
standards.
BDo not store or use any combustible materials (paper,
thinners, paints, propellant, cleaning agents etc.)
inside or within the vicinity of the appliance.
Where these requirements are impossible to fulfill, an
alternative site must be selected.
SURFACE TEMPERATURE
DANGER:
BISOLATE THE MAINS GAS SUPPLY
BEFORE STARTING ANY WORK AND
OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
CAUTION:
BDo not install the appliance where the
inlet water temperature exceeds 60°C. In
such cases we recommended the
installation of a thermostatic mixing valve
on the water supply to the appliance.
NOTICE:
BNo surface protection is required against
heat transfer from the appliance.

INSTALLATION INSTRUCTIONS
6 720 646 322 (2012/05)
18
6.3 MINIMUM CLEARANCES
Choose the installation site with the following
limitations in mind:
BEnsure adequate access for maintenance work,
observing the minimum distances indicated in Fig. 22.
Fig. 22 Minimum distances
AFront > 20 mm (to a removable surface)
BSide > 10 mm
6.4 INSTALLATION OF FIXING BRACKET
BPosition the fixing bracket at the point of installation.
BMark the position of the holes for the fixing bracket,
make sure that the fixing bracket is level, only then
drill the holes.
BFix the fixing bracket to the wall using the screws and
plugs provided.
Fig. 23 Install the fixing bracket
6.5 INSTALLATION
BEFORE CLEANING THE SYSTEM:
Ensure that the system and pipe work is in good working
order.
Water quality can have an impact on appliance longevity
and may void the manufacturer's warranty.
For water analysis data call your local water supplier, or
if on a well, have well water analyzed periodically. If
water quality exceeds one or more of the values
specified below, Bosch recommends installing a water
conditioner or softener. If the water heater is operating
in applications where the outlet temperature exceeds
60°C, a water softening system is strongly
recommended. The higher the set temperature is on the
appliance, the greater the risk for scale/mineral
deposits. Damage from scale/mineral deposits is not
covered under warranty. Refer to manufacturer’s limited
warranty.
WARNING: Damage caused by drilling!
BBefore drilling ensure that there are no
pipes, electrical cables, damp proof
courses or other hazards.
Before installing the fixing bracket, ensure
that it is possible to install the water/gas/
flue connections in line with building
regulations and the guidance given in this
manual.
A
BB
6720646322-06.1V
NOTICE: Debris from the system can
damage the appliance and reduce
efficiency!
BFailure to comply with the guidelines for
water quality will invalidate the warranty.
6720608920-05.1AL

INSTALLATION INSTRUCTIONS
6 720 646 322 (2012/05) 19
BRemove appliance from the packaging.
BEnsure that all indicated parts are included.
BRemove the plastic caps from the gas and water
connections.
BLoosen the two Philips head screws located on the
bottom rear of cover (ÆFig. 24).
Fig. 24 Loosen the two screws
BLift front cover panel upward and remove.
Fig. 25
BHang the appliance in a vertical position from the
fixing bracket, taking care to correctly locate the
appliance on the central lug of the bracket.
Description Max. Levels
pH pH 6.5 - 8.5
TDS (total
Dissolved Solids)
mg/l or ppm 500
Total hardness mg/l or ppm 100
Aluminum mg/l or ppm 2.0
Chlorides mg/l or ppm 250
Copper mg/l or ppm 1.0
Iron mg/l or ppm 0.3
Manganese mg/l or ppm 0.05
Zinc mg/l or ppm 5.0
Tab. 5
6720608917-03.1AL
CAUTION:
BNever rest the heater on the gas or water
connections.
For ease of installation it is recommended
that the water connections are installed
first, followed by the remaining of the
connections.
1
2
1
6720608913-06.1AL
2

INSTALLATION INSTRUCTIONS
6 720 646 322 (2012/05)
20
6.6 WATER CONNECTION
BMark the hot and cold water pipes in order to avoid
confusion.
BJoin the hot and cold pipework onto the connections
provided.
Fig. 26
1Hot water outlet pipe
2Cold water inlet pipe
3Water valve with filter
4Water sealing washer
BMake the cold (inlet) water connection using the
sealing washer, short 22mm diameter (with attached
nut) connection pipe and water isolation valve
supplied with the appliance.
BMake the hot (outlet) water connection using the
sealing washer and short 22mm diameter pipe (with
attached nut) supplied with the appliance.
BIn order to prevent problems caused by water
hammer, it is advisable to install a non-return valve.
6.7 CONDENSATE PIPE WORK
Fig. 27
1Condensate trap cover
2Condensate drain connection
6.7.1 INTERNAL CONNECTIONS
In order to minimise risk of freezing during prolonged
cold spells, the following methods of installing
condensate drainage pipe should be adopted, in order of
priority.
Wherever possible, the condensate drainage pipe should
be routed and terminated so that the condensate drains
away from the water heater under gravity to a suitable
CAUTION:
BIsolate the mains supplies before starting
any work and observe all relevant safety
precautions.
Make sure that connections doesn’t
obstruct access to the condensate trap
cover (ÆFig. 27, pos. 1).
6720646322-23.1V
2
1
3
4
4
NOTICE:
BWhere a new or replacement water
heater is being installed, access to an
internal “gravity discharge” point should
be one of the factors considered in
determining water heater location.
BThe condensate pipe must be nominally
32mm Ø plastic pipe.
BThe condensate pipe work must fall at
least 50mm per metre towards the outlet
and should take the shortest practicable
route.
BEnsure there are no blockages in the pipe
run.
Key to condensate illustrations
1 Condensate discharge from water heater
2 Soil and vent stack
3 Minimum 450mm and up to three storeys
4 Visible air break at plug hole
5 Sink or basin with integrated overflow
6 75mm sink waste trap
7 Condensate pump
8 Condensate trap
Tab. 6
2
1
6720646322-24.1V