STIEBEL ELTRON SBB 300 Trend User manual

11010260-00 - 02-2023
SBB Trend
300 l.
UK
SAFETY INFORMATION
O&M INFORMATION
INSTALLATION MANUAL
TDS - TECHNICAL DATA SHEET

2
CONTENTS
!
This document should be kept in a suitable place where it is accessible for future reference.
1. Safety instructions........................................ 3
1.1 General information ................................ 3
1.2 Safety instructions for users ................... 4
1.3 Safety instructions for installers.............. 4
2. Product description ...................................... 5
  2.1. Productidentication .............................. 5
2.2. Intended use .......................................... 5
2.3 CE marking ............................................ 5
  2.4 ErPproductche(TDS) ......................... 5
3. Installation instructions ............................... 6
3.1. Products covered by these
instructions .............................................. 6
3.2. Included in delivery ................................. 6
3.3. Product dimensions .............................. .. 6
3.4. Requirements for installation,
location and positioning ......................... 6
3.5. Component check list ............................. 7
3.6. Supply requirements............................... 7
3.7. General layout......................................... 8
3.8. Pipe installation ....................................... 9
3.9. Positioning the unit.................................. 9
3.10 Flow and Return and Motorised valve...10
3.11 Commissioning ..................................... 11
3.12 Draining ................................................. 11
  3.13Systemushing..................................... 11
3.14 Piping Diagrams.................................... 12
4. Electrical installation ................................... 13
  4.1. Wiringandelectricaltting.................... 13
4.2. Immersion heater thermostat ............... 14
4.3. Indirect heating system......................... 14
4.4 External heat source............................. 15
4.5 S-plan wiring.......................................... 16
4.6 Y-plan wiring.......................................... 18
4.7 Handover to end-user........................... 20
5. User Guide.................................................... 21
5.1. Settings.................................................. 21
6. Safety and servicing ................................... 22
6.1. Safety Cut-out ....................................... 22
6.2 Intermittent or slow discharge from
tundish ................................................... 22
6.3 Continous very hot water discharge
from tundish........................................... 22
6.4 Expansion vessel maintenance ........... 22
6.5 Guarantee ............................................. 22
6.6 Servicing Precedure ............................. 22
7. Fault Finding Guide .................................... 23
  7.1. Faultsandxes..................................... 23
7.2. Alternative discharge ............................ 24
7.3 Secondary return .................................. 25
7.4 Spare parts............................................ 25
8. Technical data.............................................. 26
8.1. Data table ............................................. 26
Installation, commissioning and
Service Record Log Book .................... 27
Guarantee ............................................. 30

3
1. SAFETY INSTRUCTIONS
1.1 General information
• Read the following safety instructions
carefully before installing, maintaining or
adjusting the water heater.
• Personal injury or material damage may
result if the product is not installed or used
in the intended manner.
• Keep this manual and other relevant docu-
ments where they are accessible for future
reference.
• The manufacturer assumes compliance
(by the end-user) with the safety, operat-
ing and maintenance instructions supplied
and(bytheinstaller)withthettingmanual
and relevant standards and regulations in
e󰀨ectatthedateofinstallation.
Symbols used in this manual:
!
WARNING Could cause serious injury or death
!
CAUTION Could cause minor or moderate injury or damage to property
DO NOT
!
DO
1.1.2 Aknowledgement of purchase
Thank-you for purchasing the SBB 300 Trend un-
vented hot water cylinder.
The product is an unvented hot water cylinder for
use with heat pump installations. Its energy e󰀩-
ciencyas denedby standingheatlosses is the
best in its class due to the use of vacuum insulated
Panels(VIP)andwillsavethehouseholdersigni-
cant energy costs over the lifetime of the cylinder.
This manual gives detailed advice for installation
and should be read carefully prior to tting any
unvented unit. SBB cylinders are not suitable for
gravity fed primary systems. In known hard water
regions, precautions should be taken to prevent
limescale formation in hot water cylinders, in ac-
cordance with Building Regulation Part L, Domes-
tic Heating Compliance Guide.
This cylinder must be installed by a competent per-
son and be installed in compliance with the Installa-
tion and Maintenance Instructions, all current legis-
lation, codes of practice and regulations governing
the installation of unvented hot water cylinders in
force at the date of installation.
!
NOTE
Please read this manual before installation and
leave with the cylinder. The manual and attach-
ed logbook serve as the cylinder guarantee.
!

4
1.3 Safety instructions for installers
!
WARNING
SafetyvalveoverowsmustNOTbesealedorplugged(safetyvalvenotincluded)
!
The discharge pipe from any safety device shall be at least one pipe size larger than
thenominaloutletsizeofthesafetydevice(<9mlength).Thedischargepipeshallhave
continuous fall to drain, be uninterruptible and frost-free at all times.
!
Fixedelectricttingsshallbeusedforinstallationinnewhomesorwhenchangingan
existing electrical setup in accordance with regulations. A mains cable with plug for wall
socket can be used when replacing the product without changing the electrical setup.
!
Themainscableshallwithstand90°C.Astrainrelievermustbetted.
!
Theproductshouldbelledwithwaterbeforethepowerisswitchedon.
!
The relevant regulations and standards, and this installation manual, must be followed.
1.2 Safety instructions for users
!
WARNING
SafetyvalveoverowsshallNOTbesealedorplugged(safetyvalvenotincluded).
The product shall NOT be covered over the cover on the front.
TheproductshallNOTbemodiedorchangedfromitsoriginalstate.
Children shallt NOT play with the product or go near it without supervision.
!
Theproductshallbelledwithwaterbeforethepowerisswitchedon.
!
Maintenance/settingsshallonlybecarriedoutbypersonsover18yearsofage,withsu󰀩cient
understanding
!
CAUTION
The product must not be exposed to frost, over-pressure, over-voltage or chlorine treatment.
See warranty provisions.
Maintenance/settings shall not be carried out by persons of diminished physical or mental capa-city,
unless they have been instructed in the correct use by someone responsible for their safety.
!
CAUTION
!
Theproductshallbeplacedinaroomwithaoordrain.
The manufacturer assumes no responsibility whatsoever if this provision is not followed.
!
Theproductshallbeproperlyalignedverticallyandhorizontally,onaoororwallsuitablefor
the total weight of the product when in operation. See type plate.
!
The product must have a clearance for servicing of 40 cm in front of the electric junction box
cover / 10 cm over the highest point.

5
2.4 ErPproductche-TechnicalDataSheet
Trade mark M T
item No. Model/identier ErP Rating
Standing heat
loss W
Capacity
L
Stiebel Eltron 206187 SBB300Trend-2.8kW/1x230V+HX3.1m² B69 284
Regulation: 2017/1369/EU - Regulation: EU 812/2013 Directive: 2009/125/EC - Regulation: EU 814/2013
Heat loss tested according to standard: EN 12897
2.PRODUCTDESCRIPTION
2.1 Productidentication
Identicationdetailsforyourproductcanbefound
onthetypeplatexedtotheproduct.Thetypeplate
contains details of the product in accordance with
EN 12897:2016 and EN 60335-2-21, as well as
other useful data. Contact Stiebel Eltron for more
information.
SBB Trend products are designed and manufac-
tured in accordance with:
• Pressure vessel standard EN 12897:2016
• Safety standard EN 60335-2-21
• Welding standard EN ISO 3834-2
Themanufactureriscertiedfor
• Quality ISO 9001
• Environment ISO 14001
• Work environment ISO 45001
2.2 Intended use
The SBB 300 Trend is designed to supply homes
with hot running water. The product is intended for
use with alternative energy sources, specically
Stiebel Eltron heat pumps.
2.3 UKCA marking
The UKCA mark shows that the product complies
with the relevant Directives.
The product complies with Directives for:
•Lowvoltage  LVD2014/35/EU
• Electromagnetic compatibility EMC 2014/30/EU
• Pressurised equipment PED 2014/68/EU
Anysafetyvalve(s)usedshouldbeCE-marked
and comply with the PED 2014/68/EU.

6
!
CAUTION
Pipe stubs, valves etc. should not be used to lift
the product as this could cause malfunctions.
3. INSTALLATION INSTRUCTIONS
3.1 Products covered by these instructions
206187 - SBB 300 Trend
3.1.1 Health and safety regulations
Handling Operations Regulations 1992 denes
manual handling as: “any transporting or support-
ing of a load (including the lifting, putting down,
pushing, pulling, carrying or moving thereof) by
hand or bodily force” The Regulations set no spe-
cicrequirementssuchasweightlimits.However
common sense still has to be used based on an
ergonomic approach for each individual.
The product shall be transported and stored in a
vertical position.
3.3.2 Delivery
The product shall be transported carefully as
shown, with packaging. Use the handles in the
box.
3.3.3 Siting the product
There are few restrictions on the siting of the
product, however it should not be sited anywhere
open to frost attack. The unit shall be placed on
astableatsurfacecapableofwithstandingthe
weightofthecylinder whenfull(seedataplate)
and access must be allowed for maintenance
purposes. Provision should also be allowed for
the routing of the discharge pipe away from the
cylinder to an outside point according to building
regulation G3.
3.4 Requirements for installation, location
and positioning
!
CAUTION
!
Theproductshallbeplacedinaroomwithaoordrain.
The manufacturer assumes no responsibility whatsoever if this provision is not followed.
!
The product shall be placed in a dry and permanently frost-free position.
!
Theproductshallbeplacedonaoororwallsuitableforthetotalweightoftheproductwhen
in operation. See type plate.
!
The product must have a clearance for servicing of 40 cm in front of the electric junction box
cover / 10 cm over the highest point.
!
The product shall be easily accessible in the home for servicing and maintenance.
Min. 10 cm
Min.
40 cm

7
3.5 Component check list
Components supplied with the unit in a separate
accessorykitforsitetting:
• Multibloc valve, includes pressure reduc-
ing valve, line strainer, balanced cold water
take o󰀨 (for shower or bidet only), check
and expansion valve.
• Tundish
• 3/4’’ x 22mm Elbow / Drain Cock
• Motorized valve
• Expansion vessel.
3.5.1 Components factory tted
• Immersionheater(s)
• Thermostats / thermal cut-out
• Temperature and pressure relief valve.
3.5.2 Documentation supplied
• Installation manual & log book
3.6 Supply requirements
An uninterrupted 22 mm cold water mains sup-
ply is recommended, a minimum standing pres-
sure of 2.5 bar and a ow rate of 20 litres per
minute with a 1 bar dynamic pressure is recom-
mended. The cylinder will operate at lower pres-
suresand owrates howeverthe performance
will be compromised. This unvented unit is de-
signed for use with supply pressure up to 10 bar.
For pressures over 10 bar an additional pressure
reducingvalvemustbettedinthesupplypipe
to the unit.
3.6.1 Expansion vessels
The vessel accommodates expanded water
when the cylinder is heated and prevents the cyl-
inder reaching its maximum working pressure.
3.6.2 Compatible ttings and components
All thermostatically controlled boilers are com-
patible with indirect cylinders.
3.6.3 Non-compatible products.
Solid fuel boilers, wood burning stoves and other
non-thermostatically controlled heat sources
must not be used with unvented cylinders.

8
3.7 General layout
Ref no. Key Part No.
1Flow 3/4” BSP
2Return 3/4” BSP
3PressureReducingValveMultibloc
(adjustable)includesItem4 355030
4Expansionreliefvalve(6bar) PREL355030
5Temperature and Pressure Relief
Valve 550853
6Tundish 219005
7Immersion Heater 71242
8Immersion heater thermostat 80314
9Thermostat 80345
10 Coldfeedtube(notsupplied,see
pt.3.7.2Coldfeedtube)
11 Hot Water Outlet 3/4” BSP
12 Elbow/Drain Cock 250445
13 DischargePipe(notsupplied)
14 Motorizedvalve(notfactorytted) 92000
15 Expansion vessel
16 Secondary Return
Vessel
size Lengthoftube(ø28)mm Expansion vessel pre charge / size
300 1450 3 bar / 24 litre
3.7.2 Cold feed tube3.7.1 Reference chart
90°
65°
80°
595
675
45°
15
3
5
6
4
11
13
10
12
14
1
216
9
8
7

9
3.8 Pipe installation
The product is designed to be permanently
connected to the mains water supply.
Approved pipes of the correct size should be
used for installation. The relevant standards and
regulations must be followed.
3.8.1 Incoming water pressure
Thee󰀩ciencyoftheproductdependsonthein-
coming cold water pressure. The water pressure
should be min. 2 bar and max. 6 bar throughout
the day. Excessive water pressure can be adjust-
ed by installing a pressure reduction valve.
3.8.2 Connecting pipes
Pipes of suitable size and quality should be run to
theconnectionsontheproductandxedwitha
suitable sealant.
A safety valve of the approved type (see page
3)shouldbettedintheheatingcircuit(notsup-
plied).Thesafetyvalveshouldnotbepluggedor
blocked.Anyoverowpipefromthesafetyvalve
must be uninterruptable, undamaged and frost-
free with a fall to the drain.
3.9 Positioning the unit
Thewaterheatershouldbettedlevelonahard
surface with su󰀩cient load strength to take the
fullweightofthecylinder(seetechnicaldatatable
page12).Therearenolimitationsregardingthe
tting distance from walls etc., but it is strongly
recommended to ensure easy access to all pipe
ttingsetc.TheTemperatureandPressurerelief
valve and immersion heater are positioned at 90°
apart. The product must be positioned to ensure
that the tundish is visible and there is easy ac-
cess to the thermostat and to remove the immer-
sion heater if required.
3.9.1 Protection from frost
If the water heater is in danger of being exposed
to frost while not operating under electric power,
the unit must be drained to avoid damage. Make
suretheelectricpoweristurnedo󰀨beforedrain-
ing, otherwise the heating elements can be dam-
aged and the warranty is void. Draining instruc-
tions, see “Draining ” on page 5.
3.9.2 Cold water supply
1. To obtain the best performance from your
unvented system it is advisable to feed the
unit with an uninterrupted supply.
2. Beforeconnectingtothemultibloc,ushthe
coldsupplypipeworkofalluxanddebris.
3. Locate the water heater in a suitable position
to facilitate the installation of the cold water
supply,dischargettingsandpipework.Also
take into account access to the immersion
heater.
4. Fit the combined male elbow drain cock to
coldsupplypoint(14),sothatthecompres-
sionttingisvertical.
5. Fit the length of copper tube 22 mm speci-
ed in Table 1 to the cold feed elbow (see
pt.4above).
6. FittheMultibloc(5)tothetopofthecopper
tube(seept.5above).
7. Connect 15 mm copper tube from the ex-
pansion relief valve (4) and also from the
T&Pvalve(5)andjointogetherinaTeeas
shown on page 8.
8. Fitthetundish(8)tothebottomconnection
of this tee.
9. Connectthecoldsupplytothemultibloc(5).
10. Fit the expansion vessel to the wall close to
the water heater using the enclosed mount-
ing bracket. Connect the expansion vessel
to the multibloc, as shown on page 8.
3.9.3 Hot water supply
Connect the hot water supply pipe to the outlet
(13).Ensureconnectioniswatertight.
3.9.4 Balanced cold water supply (optional)
If no balanced cold supply is required, tighten
the supplied blanking cap. If a balanced mains
pressure cold water supply is required to a
shower or bidet (over rim type only, ascending
spray type requires typeAA,AB orAD air gap),
remove blanking cap and connect to the shower
or bidet cold supply on the multibloc valve (5).
(Majorshowermanufacturersadvisettingamini
expansion vessel in the balanced cold supply
pipework to accommodate thermal expansion
andpreventtighteningofshowercontrols)Using
the balanced cold connection to feed bath taps
can reduce the ow available to the unvented
cylinder.
3.9.5 Secondary return (optional)
Connect secondary return if required to tting
(18)page8,seetechnicaldatatableonpage26.

10
3.10.1 Fitting instructions
3.9.6 Discharge pipe
!
CAUTION
!
Theproductshallbeplacedinaroomwithaoordrain.
The manufacturer assumes no responsibility whatsoever if this provision is not followed.
!
Theproductshallbeproperlyalignedverticallyandhorizontally,onaoororwallsuitablefor
the total weight of the product when in operation. See type plate.
!
The product must have a clearance for servicing of 40 cm in front of the electric junction box
cover / 10 cm over the highest point.
!
WARNING
!
Theproductshallbelledwithwaterbeforethepowerisswitchedon.
!
The discharge pipe from any safety device shall be at least one pipe size larger than
thenominaloutletsizeofthesafetydevice(<9mlength).Thedischargepipeshallhave
continuous fall to drain, be uninterruptible and frost-free at all times.
Connect the tundish outlet to the discharge pipe.
Install the Tundish in a vertical position within
a maximum of 600 mm from the Temperature
andPressureReliefValvedrainconnectionand
away from electrical components. Ensure the ex-
pansion relief pipework discharges through the
tundish. Tundish pipework must be 22 mm with a
minimum vertical length of 300 mm below tundish.
Maximum permitted length of 22 mm pipework is
9 m. Each bend or elbow is equivalent to 0.8 m
of pipework. All pipework must have continuous
fall and discharge in a safe, visible position. If any
doubt, refer to Building Regulation G3. Discharge
pipe must be dedicated to the cylinder and must
not be used for any other purpose.
3.10 Flow and Return and Motorized valve
The boiler primary ow and return connections
should be made connections 1 & 2. The motorized
valvecanbeconnectedtoeithertheprimaryow
orreturnpipe.Theprimaryowandreturnttings
RECOMMENDATION
-Allowclearancetotheoor.Unscrewthefeetaminimumof15mmfromthebottomoftheproduct.
-Mainspowercable(3)shouldbehiddenunderoneofthechannelsinthebottomoftheproduct.
-Ifanon-returnvalveisttedinthesystemareductionvalveandexpansionvesselshallbe
tted(tostopdrippingfromthesafetyvalve).
-If the maximum water pressure exceeds 6 bar in a 24-hour period, a reduction valve and expansion
vesselshallbetted.
-
For installation in a rooms which does not conform to the wetroom standard, a watertight
driptraywithoverowpipe> 18mm.insidediametershouldbettedundertheproduct,in
addition to an automatic stop cock with sensor. This will prevent possible material damage.
3.10.2 Fitting recommendation
are 3/4’’ BSP female. The valve has 22mm x cop-
per connections. The direction of primary ow in
the coil is bottom to top. The maximum operating
temperatureoftheprimaryowwouldtypicallybe
82°C.
For electrical connection of the motorized valve
and immersion heater, please read Electrical
Installation Instructions on page 13.
3

11
3.11 Commissioning
1. Check all connections for tightness.
2. Open a hot water tap furthest away from the
cylinder.Openthemainsstopcocktollthe
waterheater.Whenwaterowsevenlyfrom
tap,allowto run fora few minutesto ush
through any dirt, swarf or residue, then close
the tap. Open successive hot taps to purge
any remaining air.
3. Check all water connections for leaks and
rectify if necessary
4. Manually operate Expansion relief valve
6 (see  page 8) to ensure free water ow
through discharge pipe by turning knob
counter-clockwise. To close continue to turn
counter-clockwise until the valve shuts.
5. Manually operate Temperature and Pres-
sureReliefValve7(seepage8)toensure
freewaterowthroughdischargepipe(Turn
knobcounter-clockwise).
6. Switch electrical power on.
3.12Draining
Switcho󰀨theelectricalpower(Importanttoavoid
damagetoelement).
Isolateboilerfromcylinder.Turno󰀨thecoldwa-
ter supply valve. Open hot water tap. Open drain
valve(seepage8)atbaseofcylinder.Theunit
will drain.
Draining process may be speeded up by open-
ing the temperature and pressure relief valve. An
internalø18mmhosecanbeappliedtoleadthe
water to a gully, sink or similar.
3.13Systemushing
This will not be necessary under nor-
mal circumstances as the line strainer will
prevent ingress of foreign materials, however
if ushing is required, run at least 50 litres of
water from the cylinder at the highest possible
ow rate. Close the taps and follow draining
procedure(above).
3.10.3 Pressure drop table - coil
Product info: Pressure drop (mbar) at volume flow: Cw value (m³/h):
Product
Coil sur-
face m²
540 L/h
(0,15L/s)
900 L/h
(0,25 L/s)
1800 L/h
(0,50 L/s)
2700 L/h
(0,75 L/s)
3600 L/h
(1,00L/s)
4500 L/h
(1,25 L/s)
5400 L/h
(1,50 L/s)
Flow @ 1bar
pressure drop
SBB 300 Trend 3.1 51 117 440 890 1555 2330 3340 2.9

12
3.14PipingDiagrams
3.14.1 S-plan piping diagram
3.14.2 Y-plan piping diagram
Pump
flow
2-port valve
(supplied)
Automatic
bypass
Radiators/
UFH
Heat
source
Pump
flow
2-port valve
(supplied)
Mid pos. valve
(not supplied)
Radiators/
UFH
Boiler
Automatic
bypass

13
4. ELECTRICAL INSTALLATION
4.1Wiringandelectrictting
All wiring must conform to current IEE regulations
Anyxedelectricttingsmustbeinstalledbyan
authorised electrician. The relevant standards
and regulations must be followed.
When connecting cables to thermostats, use
spade connectors as shown in diagram. Ensure
that connector is less than 10 mm in outer di-
mension and fits inside the shoulders of the ther-
mostat and is not tightened onto the top of the
shoulders.
!
WARNING
The thermostat must never be dismantled/
opened. This will compromize its function
and cause risk of overheating. Warranty will
cease.
3.6.3 Torque settings
!
WARNING
Constant voltage present at terminals L and N.
Before any electrical work is done, the power
supply must be disconnected and secured
against activation while the work is in progress.
Component Torque
G 1.1/4” external - heating element 60 Nm (+/- 5)
Thermostat screws (1 and 2) 2 Nm (+/- 0.1)
Earth screw on the element head 2 Nm (+/- 0.1)
A) Live wire (L) connected to point ‘1’ on the
thermostat.
B) Neutral wire (N) connected to point ‘2’ on the
thermostat.
C) Yellow wire with green stripe – Earth – con-
nected to the terminal for the heating element
(hexagonal brass)
3.6.1 Electrical components
3.6.2 Electrical connections in the junction box
Component Note
Safety thermostat 85°C safety cut-off
Working thermostat 50-75°C adjustable
Heating element 2.8 kW - 1-phase 230V
Power supply cable Heat resistant to 90°C
Internal wires Heat resistant
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
60°C90°C
80°C 70°C
1
2
L N
Electric connection, schematic
MAX
10 mm

14
4.2 Immersion heater thermostat
The immersion heater is designed as an aux-
iliary heater as an emergency back-up. Power
to immersion heaters should not be switched
onuntiltheunitislledwithwater.Allunitsare
ttedwithone2.8kWimmersionheaterwhich
is located behind the electrical box. Alternative
thermostats should not be used, regulations re-
quire immersion heaters on unvented cylinders
to be connected with a thermal cut-out. Follow
the wiring instructions connecting the live, neu-
tral and earth as indicated.
The unit must be connected to a minimum 16
amp dedicated permanent supply complying
with current I.E.E Wiring regulations, isolation
is required via a minimum 20 amp double pole
isolation switch with a minimum 3 mm sepa-
ration required. All electrical wiring should be
carried out by a competent electrician, using a
heatresistantcable(minimum85°C),andbein
accordance with the latest I.E.E Wiring Regula-
tions.
Each immersion heater has a working thermo-
statadjustablebetween40°C-70°C(+/-5°C).
A safety cut-out is also incorporated within the
thermostat and will operate at 85°C (± 7°C).
Should this happen, check reasons for thermal
cut-out button being released and when satis-
edpresstheresetbutton.
The immersion wiring should be run through a
channel from base of cylinder to the immersion
housing. The cable should be secured using
the supplied clamps in the bottom opening of
the channel.
4.3 Indirect heating system
4.3.1 Motorised valve
To comply with regulations governing the in-
stallation of indirect unvented cylinders, a
motorised valve must be tted in the primary
pipework. Your cylinder has been supplied with
a two port motorised valve, which will act as a
positive energy cut-out should the safety cut-
out operate. The motorised valve will also con-
trol the temperature of the domestic stored wa-
ter via the cylinder thermostat, which is located
in the electrical box. The unit can be installed
on an “S” or “Y” plan system. Please follow the
wiring instructions carefully.

15
Thesecond(limit)safetythermostatispre-set
to 85°C with a concealed manual reset, to com-
ply with building regulations. Should the safety
cut out be brought into operation, the motorised
valve will operate and close down the primary
owtothecylinder.Toresetthesafetycut-
out and the motorised valve the reset but-
ton must be pressed in.
Alsosee S-PlanandYPlanWiringonpage16-19.
This product requires a fused permanent Live
and Neutral supply.
4.4 External heat source
Heat sources to unvented hot water cylinders
must be controlled by a thermal cut-out as well
as a thermostat. The product is supplied with
twosensorpockets (seept.4.6.4).Anyexter-
nal heat source controller (not supplied) shall
be wired through the thermal cut-out.
Connect the external heat source to the coil
withtheprimaryow inabottomto topdirec-
tion as shown in illustration.
Ifusinga6-wire28mmor1”BSPV4043Hon
either circuit the white wire is not needed and
must be made electrically safe. Flow
Return

16
!
WARNING
The Manufacturer can not be held responsible
if alternative wiring plans are used.
Important: Before resetting the safety cut-out
or altering the thermostat setting isolate elec-
trical supply to the unit before removal of the
lid.Ensurethelidtothejunctionboxisretted
before power is switched back on.
4.5S-planwiring
TheSBB300Trendcylindercanbettedwith
all types of boilers.
Standard boilers operate using room and cylin-
der thermostats. Please follow upper diagram:
‘Wiring for Standard Boiler’.
4.5.1 Thermistor controlled boilers
Many popular boilers now use a thermistor prin-
ciple. A thermistor temperature sensor is sup-
plied with the boiler to attach to the cylinder.
Temperature information is relayed back to the
boiler control system.
Twosensorpockets(1)areprovidedtosecure
thesensoronthecylinder(seept.4.6.4).
The supplied motorised valve must be
used in accordance with Building Regula-
tion G3. This is wired from the supplied cyl-
inder thermostat, wired as high limit stat.
Please follow lower diagram: ‘Wiring diagram
for Thermistor Controlled Boiler’.
1
1

17
Wiring diagram for Standard Boiler
S-planwiring
S-planwiring
Wiring diagram for Thermistor controlled Boiler
Please contact boiler manufacturer for boiler
specicwiring.
1 2
E
231
T6360B
B1BrG O
G/Y
3 5 7
34NL
C NONC LN
ENL ENL
ST6400
Boiler Pump
321 32 32
2 2 31
V4043H
Zone Valve (DHW)
(supplied)
Cylinder thermostat
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Zone Valve (Htg)
(not supplied)
Room
thermostat
6
B1BrG O
G/Y
2
2
31
1
V4043H
4 8 109
HTG
ON
HW
ON
1 2
E
231
T6360B
B1BrG O
G/Y
3 5 7
34NL
C NONC LN
ENL ENL
ST6400
Boiler Pump
321 32 32
2 2 31
V4043H
Zone Valve (DHW)
(supplied)
Cylinder thermostat
(supplied) - Wired as
high limit thermostat
Isolated Mains
Supply From
Fused Spur
L N E
Zone Valve (Htg)
(not supplied)
Room
thermostat
6
B1BrG O
G/Y
22
31 1
V4043H
4 8 109
HTG
ON
HW
ON
Thermistor wire
Connected to
boiler control
system
Thermistor

18
4.6Y-planwiring
TheSBB300Trendcylindercanbettedwith
all types of boilers. Standard boilers operate
using room and cylinder thermostats. Please
follow upper diagram: ‘Wiring for Standard
Boiler’.
4.6.1 Thermistor controlled boilers
Many popular boilers now use a thermistor
principle. A thermistor temperature sensor is
supplied with the boiler to attach to the cylinder.
Temperature information is relayed back to the
boiler control system.
Twosensorpockets(1)areprovidedtosecure
thesensoronthecylinder(seept.4.6.4).
The supplied motorised valve must be
used in accordance with Building Regu-
lation G3. This is wired from the sup-
plied cylinder thermostat, wired as high
limit stat Please follow lower diagram:
‘Wiring diagram for Thermistor Controlled heat
source’.
!
WARNING
The Manufacturer can not be held responsible
if alternative wiring plans are used.
Important: Before resetting the safety cut-out
or altering the thermostat setting isolate elec-
trical supply to the unit before removal of the
lid.Ensurethelidtothejunctionboxisretted
before power is switched back on.
1
1

19
Y-planwiring
1 2
E
231
T6360B
B1OG Br
G/Y
3
3 14NL ENL ENLST6400
Boiler Pump
321 32 32
2 2 31
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
WB1 G/Y Gr O
23
V4073A1039
104 5 987
C NONC LN
Cylinder thermostat
(supplied)
HTG
ON
HW
ON
HW
OFF
1 2
E
231
T6360B
B1OG Br
G/Y
3
3 14NL ENL ENLST6400
Boiler Pump
321 32 32
2 2 31
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
WB1 G/Y Gr O
23
V4073A1039
104 5 987
C NONC LN
Cylinder thermostat
(supplied)
HTG
ON
HW
ON
HW
OFF
Thermistor wire
Connected to
boiler control
system
Thermistor
Wiring diagram for Standard heat source
Y-planwiring
Wiring diagram for Thermistor controlled heat source
Pleasecontactheatsourcemanufacturerforproductspecicwiring.

20
4.7Handovertoend-user
THE INSTALLER MUST:
Brief the end-user on safety and maintenance instruc-
tions.
Brief the end-user on settings and emptying the product.
Hand this installation manual over to the end-user.
Enter contact details on the type plate on the product.
RECOMMENDATION
-Mainscable(1)forwallsocket/wallboxshouldbehiddenunderoneofthechannelsinthebottom
of the product, see illustration at bottom of page.
-Forproductswith≤2kWcapacity,a> 10A fuse / > 1.5# wire should be used*.
Forproductswith≤3kWcapacity,a> 15A fuse / > 2.5#wireshouldbeused(230V).
4.6.2 Fitting instructions
4.6.3 Fitting recommendation
!
WARNING
!
Theproductshallbelledwithwaterbeforethepowerisswitchedon.
!
Fixedelectricttingsshallbeusedforinstallationinnewhomesorwhenchanginganexisting
electrical setup in accordance with regulations.
!
Themainscableshallwithstand90°C.Astrainrelievermustbetted(supplied).
!
CAUTION
!
The product must have a clearance for servicing of 40 cm in front of the cover / 10 cm
over the top connection.
!
If the mains cable is damaged, it must be replaced with cable of a quality that meets the
requirementsoftheinstallation.Thecablemustbereplacedbyaqualiedelectrician.
1
4.6.4 Temperature sensor installation
The product is equipped with two temperature
sensor brackets which allows installation of a 6 or 8
mm. temperature sensor. To install the temperature
sensor follow the instructions below.
1. Remove temperature sensor bracket (A) from
tank body by gripping it and pulling straight out.
2. Insert temperature sensor (B) firmly into the
appropriate grooves in the sensor bracket and
place the temperature sensor cable in the cable
slot (D).
An 8 mm. sensor (shown) fits in the upper
grooves (C) while a 6 mm. sensor fits in the lower
groove (E).
3. Refit the sensor bracket into the tank body,
ensuring the bracket is inserted fully to establish
proper contact between the sensor and the
stainless steel inner tank surface. Make sure the
sensor cable is positioned properly in the cable
slot (D) to avoid potential damage to the cable.
B
C
E
D
A