Center CenterStore Solar Series User guide

1
1
PACK CONTENTS
The CENTERSTORE Solar unvented solar cylinder water heater incorporating immersion heater(s) and thermal
controls Factory fitted temperature/pressure relief valve lCold water combination valve assembly lExpansion
vessel and mounting bracket lTundish lMotorised valve l Compression nuts and olives lImmersion heater spanner
lInstallation instructions
IMPORTANT: PLEASE READ AND UNDERSTAND ALL THESE INSTRUCTIONS
BEFORE COMMENCING INSTALLATION. PLEASE LEAVE THIS MANUAL WITH
THE CUSTOMER FOR FUTURE REFERENCE.
NOTE: Prior to installation the unit should be stored in
an upright position in an area free from excessive damp
or humidity.
The CENTERSTORE Solar cylinder is a purpose de-
signed unvented solar water heater.The unit has a
stainless steel inner vessel, which ensures an excellent
standard of corrosion resistance.The outer casing is a
combination of resilient thermoplastic mouldings and
corrosion proofed steel sheet. All products are insulat-
ed with CFC/HCFC free polyurethane foam to meet the
latest European heat loss requirements (see Table 6).
The unit is supplied complete with all the necessary
safety and control devices needed to allow connection
to the cold water mains. All these components are
preset and not adjustable.
This appliance complies with the requirements of the
CE marking directive and is Kiwa approved to show
compliance with Building Regulations (Section G3).
The following instructions are offered as a guide to
installation which must be carried out by a competent
plumbing and electrical installer in accordance with
Building Regulation G3,The Building Standards
(Scotland) Regulations 1990, or The Building Regula-
tions (Northern Ireland).
THE BENCHMARK SCHEME
Benchmark places responsibilities on both manufacturers and installers.The purpose is to ensure that customers
are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in
accordance with the manufacturer’s instructions by competent persons and that it meets the requirements of
the appropriate Building Regulations.The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations and should be provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark
Code of Practice which is available from the Heating and Hotwater Industry Council who manage and promote
the Scheme.Visit www.centralheating.co.uk for more information.
IMPORTANT NOTE TO USER: PLEASE REFER TO THE USER INSTRUCTIONS SECTION ON PAGES 14 AND 15 FOR
IMPORTANT INFORMATION WITH RESPECT TO THE BENCHMARK SCHEME
UNVENTED MAINS PRESSURE SOLAR WATER HEATERS
190, 210, 250 and 300 LITRE CAPACITY INDIRECT MODELS
INSTALLATION AND SERVICING INSTRUCTIONS
Solar
INTRODUCTION
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

2
Contents
INTRODUCTION.................................................................1
GENERAL REQUIREMENTS.............................................3
INSTALLATION-GENERAL...............................................4
INSTALLATION - SOLAR PRIMARY...............................9
INSTALLATION - AUXILLARY HEATING COIL...........10
COMMISSIONING.............................................................12
MAINTENANCE..................................................................13
USER INSTRUCTIONS.......................................................14
FAULT FINDING AND SERVICING.................................15
OTHER INFORMATION.....................................................17
ENVIRONMENTAL INFORMATION...............................17
COMMISSIONING CHECK LIST......................................18
SERVICE RECORD..............................................................19
GUARANTEE.......................................................................20
TECHNICAL SUPPORT AND SPARES...........................20
PAGE
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

3
3
Table 1: Unit weights
SITING THE UNIT
The CENTERSTORE Solar must be installed vertically.
Although location is not critical, the following points
should be considered:
• The CENTERSTORE Solar should be sited to en-
sure minimum dead leg distances, particularly
to the point of most frequent use.
• Avoid siting where extreme cold temperatures
will be experienced. All exposed pipework
should be insulated.
• The discharge pipework from the safety valves
must have minimum fall of 1:200 from the unit
and terminate in a safe and visible position.
• Access to associated controls and immersion
heaters must be available to provide for the
servicing and maintenance of the system.
Where these controls are installed against a wall
a minimum distance of 250mm must be left (see
Fig. 1).
• Ensure that the floor area for the CENTERSTORE
Solar cylinder is level and capable of perman-
ently supporting the weight when full of water.
(See Table 1).
WATER SUPPLY
Bear in mind that the mains water supply to the property
will be supplying both the hot and cold water require-
ments simultaneously. It is recommended that the
Type Model
reference
Nominal
capacity
(litres)
Weight of
unit full
(kg)
INDIRECT SCS190I 190 240
SCS210I 210 264
SCS250I 250 308
SCS300I 300 367
OUTLET/TERMINAL FITTINGS (TAPS, ETC.)
The CENTERSTORE Solar cylinder can be used with
most types of terminal fittings. It is advantageous in
many mixer showers to have balanced hot and cold
water supplies. In these instances a balanced pressure
cold water connection should be placed between the
2 pieces of the cold water combination valve assembly
(see Fig. 2). Outlets situated higher than the CENTER-
STORE Solar cylinder will give outlet pressures lower
than that at the heater, a 10m height difference will
result in a 1 bar pressure reduction at the outlet. All
fittings, pipework and connections must have a rated
pressure of at least 6 bar at 80°C.
LIMITATIONS
The CENTERSTORE Solar cylinder should not be used in
association with any of the following:
• Solid fuel boilers or any other boiler in which the
energy input is not under effective thermostatic
control unless additional and appropriate safety
measures are installed.
• Ascending spray type bidets or any other class
1 back syphonage risk requiring that a type A
air gap be employed.
• Steam heating plants unless additional and
appropriate safety devices are installed.
• Situations where maintenance is likely to be
neglected or safety devices tampered with.
• Water supplies that have either inadequate
pressure or where the supply may be intermit-
tent.
• Situations where it is not possible to safely pipe
away any discharge from the safety valves.
• In areas where the water consistently contains a
high proportion of solids,e.g.suspended matter
that could block the strainer, unless adequate
filtration can be ensured.
GENERAL REQUIREMENTS
WALL
Min 250mm
maximum water demand is assessed and the water
supply checked to ensure this demand can be sat-
isfactorily met.
Note: A high mains water pressure will not always
guarantee high flow rates.
Fig. 1: Siting the Unit
The CENTERSTORE Solar cylinder has an operating pres-
sure of 3.5 bar which is controlled by the cold water
combination valve assembly.The cold water combination
valve assembly can be connected to a maximum mains
pressure of 16 bar.
Wherever possible the mains supply pipe should be
22mm. We suggest the minimum supply requirements
should be 1.5 bar pressure and 20 litres per minute flow
rate. However, at these values outlet flow rates may be
poor if several outlets are used simultaneously. The
higher the available pressure and flow rate the better
the system performance.
IMPORTANT:THIS APPLIANCE IS NOT INTENDED
FOR THE USE BY PERSONS (INCLUDING CHILDREN)
WITH REDUCED PHYSICAL, SENSORY OR MENTAL
CAPABILITIES, OR LACK OF KNOWLEDGE AND EX-
PERIENCE, UNLESS THEY HAVE BEEN GIVEN SUPER-
VISION OR INSTRUCTION CONCERNING THE USE OF
THE APPLIANCE BY A PERSON RESPONSIBLE FOR
THEIR SAFETY. CHILDREN MUST BE SUPERVISED.
OPERATIONAL SUMMARY
Maximum mains pressure 16 bar
Operating pressure 3.5 bar
Expansion vessel charge pressure 3.5 bar
Expansion relief valve setting 6 bar
T&P relief valve setting 90°C/10
Maximum primary circuit pressure
(auxillary coil) 3 bar
Maximum primary circuit pressure 6 bar
Storage capacity See Table
Weight when full See Table
bar
(solar coil)
1
1
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

4
PIPE FITTINGS
All pipe fittings are made via 22mm compression
fittings directly to the unit.The fittings are threaded
3/4”BSP male parallel should threaded pipe connec-
tions be required.
COLD FEED
A 22mm cold water supply is recommended, however
if a 15mm (1/2”) supply exists which provides sufficient
flow this may be used (although more flow noise may
be experienced).
A stopcock or servicing valve should be incorporated
into the cold water supply to enable the CENTERSTORE
Solar cylinder and its associated controls to be isolated
and serviced.
COLD WATER COMBINATION VALVE ASSEMBLY (FIG 2)
The 2-piece cold water combination valve assembly
can be located anywhere on the cold water mains
supply prior to the expansion vessel (see Fig. 6) but the
two pieces do not have to be installed together.The
pressure reducing valve incorporates the pressure
reducer & strainer and the expansion valve incorpo-
rates the expansion & check valves. Ensure that the
valves are installed in the correct order and orientation.
No other valves should be placed between the expan-
sion valve and the CENTERSTORE Solar unit.A connec-
tion can be made between the expansion and pres-
sure reducing valves to provide a balanced cold water
connection.The expansion valve connection must not
be used for any other purpose.
EXPANSION VESSEL
The expansion vessel accommodates expansion that
results from heating the water inside the unit.The
expansion vessel is pre-charged at 3.5 bar.The expan-
sion vessel must be connected between the expan-
sion valve (see Fig. 2) and the CENTERSTORE Solar
cylinder (see Fig. 6). The location of the expansion
vessel should allow access to recharge the pressure as
and when necessary, this can be done using a normal
car foot pump. It is recommended that the expansion
vessel is adequately supported. An expansion vessel
wall mounting bracket is supplied for this purpose and
should be fitted.
NOTE: DO NOT USE THE POTABLE WATER EXPAN-
SION VESSEL SUPPLIED WITH THE CENTERSTORE
SOLAR CYLINDER FOR ANY OTHER PURPOSE. IT
IS NOT SUITABLE FOR USE ON A SOLAR PRIMARY
CIRCUIT.
SECONDARY CIRCULATION
If secondary circulation is required it is recommended
that it be connected to the CENTERSTORE Solar cylinder
as shown in Fig.3.The secondary return pipe should be
in 15mm pipe and incorporate a check valve to prevent
backflow.A suitable WRAS approved bronze circulation
pump will be required. On large systems, due to the in-
crease in system water content,it may be necessary to fit
an additional expansion vessel to the secondary circuit.
This should be done if the capacity of the secondary
circuit exceeds 10 litres.
Pipe capacity (copper)
15mm O.D = 0.13 l/m (10 litres = 77m)
22mm O.D = 0.38 l/m (10 litres = 26m)
28mm O.D = 0.55 l/m (10 litres = 18m)
OUTLET
The hot water outlet is a 22mm compression fitting
located at the top of the cylinder. Hot water distribu-
tion pipework should be 22mm pipe with short runs
of 15mm pipe to terminal fittings such as sinks and
basins. Pipe sizes may vary due to system design.
DRAIN TAP
A suitable draining tap should be installed in the
cold water supply to the CENTERSTORE Solar cylinder
unit between the expansion valve (see Fig. 6) and the
heater at as low a level as possible. It is recommended
that the outlet point of the drain pipework be at least
1 metre below the level of the heater (this can be
achieved by attaching a hose to the drain tap outlet
spigot).
Fig. 2: Cold water combination valve assembly
INSTALLATION - GENERAL
(FIGS 4 & 6)
CENTERSTORE SOLAR MUST BE INCORPORATED
INTO A FULLY PUMPED SOLAR PRIMARY CIRCUIT.
CONTROL OF THE SOLAR PRIMARY IS ACHIEVED BY
THE USE OF EXTERNAL CONTROLS NOT SUPPLIED
WITH THE UNIT. CONTROL MUST BE VIA A PURPOSE
DESIGNED SOLAR HYDRAULIC STATION AND SOLAR
DIFFERENTIAL TEMPERATURE CONTROLLER.
IMPORTANT NOTE:
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

5
5
Fig. 3: Secondary circulation connection
Table 2: Dimensions and performance
ABCDE
DIMENSIONS (mm) AUXILLARY
VOLUME
(litres)
AUXILLARY COIL
SURFACE
AREA
(m)
RATING
(kW) RECOVERY
(mins)
SOLAR
SURFACE
AREA (m)
NOMINAL
CAPACITY
(litres)
NOTES:
1. Recovery time based on heating 70% of auxillary volume through 45°C
2. Direct heating times assume use of lower element only and auxillary cylinder volume being heated.
190 1372 803 923732 1019 1.1 120 0.61 11.9 22
210 1473 925 1095
1009 1184 1.1 120 0.68 18.3 17
250 1731 1072 12581160 1391 1.1 145 0.79 20.0 19
300 2038 1243 15731438 1715 1.1 175 0.79 20.0 22
370 433
412
29
A
B
C
E
D
20°
25°
30°
Ø
594
550
45°
81
Fig. 4: General dimensions
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

6
Worked example of discharge pipe sizing
Fig. 5 is for a G1/2 temperature relief valve with a dis-
charge pipe (D2) having 4 No. elbows and length of 7m
from the tundish to the point of discharge.
From Table 3:
Maximum resistance allowed for a straight length of
22mm copper discharge pipe (D2) from a G1/2 tem-
perature relief valve is 9.0m.
DISCHARGE PIPEWORK
It is a requirement of Building Regulation G3 that any
discharge from an unvented system is conveyed to
where it is visible, but will not cause danger to persons
in or about the building.The tundish and discharge
pipes should be fitted in accordance with the require-
ments and guidance notes of Building Regulation G3.
The G3 Requirements and Guidance section 3.9 are
reproduced in the following sections of this manual.
Information Sheet No. 33 available from the British
Board of Agrément gives further advice on discharge
pipe installation. For discharge pipe arrangements not
covered by G3 Guidance or BBA Info Sheet No.33
advice should be sought from your local Building
Control Officer.
Any discharge pipe connected to the pressure relief
devices (Expansion Valve and Temperature/Pres-
sure Relief Valve) must be installed in a continuously
downward direction and in a frost free environment.
The water may drip from the discharge pipe of the
pressure relief device.This pipe must be left open to
the atmosphere.The pressure relief device is to be op-
erated regularly to remove lime deposits and to verify
that it is not blocked.
G3 REQUIREMENT
“...there shall be precautions...to ensure that
the hot water discharged from safety devices is
safely conveyed to where it is visible but will not
cause danger to persons in or about the build-
ing.”
G3 GUIDANCE SECTION 3.9
The discharge pipe (D1) [see fig.5 in this instruc-
tion book] from the vessel up to and including
the tundish is generally supplied by the manu-
facturer of the hot water storage system.Where
otherwise, the installation should include the
discharge pipe(s) (D1) from the safety device(s).
In either case the tundish should be vertical,
located in the same space as the unvented hot
water storage system and be fitted as close as
possible and within 500mm of the safety device
e.g. the temperature relief valve.
The discharge pipe (D2) from the tundish should
terminate in a safe place where there is no risk
to persons in the vicinity of the discharge,prefer-
ably be of metal and:
a. be at least one pipe size larger than the
nominal outlet size of the safety device unless its
total equivalent hydraulic resistance exceeds that
of a straight pipe 9m long i.e. discharge pipes
between 9m and 18m equivalent resistance
length should be at least two sizes larger than
the nominal outlet size of the safety device,
between 18 and 27m at least 3 sizes larger ,
and so on. Bends must be taken into account
in calculating the flow resistance.Refer to Table
3,Table 1 and the worked example [see Table 3
and Fig.5 in this instruction book].
An alternative approach for sizing discharge
pipes would be to follow BS 6700:1987 Specifica-
tion for design installation, testing and main-
tenance of services supplying water for domestic
use within buildings and their curtilages, Appen-
dix E,section E2 and table 21.
b. have a vertical section of pipe at least 300mm
long, below the tundish before any elbows or
bends in the pipework.
c. be installed with a continuous fall and in a
frost free environment.
d. have discharges visible at both the tundish
and the final point of discharge but where this
is not possible or is practically difficult there
should be clear visibility at one or other of these
locations.Examples of acceptable discharge
arrangements are:
i. ideally below a fixed grating and above the
water seal in a trapped gully.
ii. downward discharges at low level; i.e. up
to 100mm above external surfaces such as
car parks, hard standings, grassed areas etc.
are acceptable providing that where children
may play or otherwise come into contactwith
discharges a wire cage or similar guard is posi-
tioned to prevent contact,whilst maintaining
visibility.
iii. discharges at high level; e.g. into a metal
hopper and metal down pipe with the end
of the discharge pipe clearly visible (tundish
visible or not) or onto a roof capable of
withstanding high temperature discharges
of water and 3m from any plastics guttering
system that would collect such discharges
(tundish visible).
iv. where a single pipe serves a number of
discharges, such as in blocks of flats, the
number served should be limited to not
more than 6 systems so that any installation
discharging can be traced reasonably easily.
The single common discharge pipe should be
at least one pipe size larger than the largest
individual discharge pipe (D2) to be con-
nected. If unvented hot water storage systems
are installed where discharges from safety
devices may not be apparent i.e.in dwellings
occupied by blind, infirm or disabled people,
consideration should be given to the instal-
lation of an electronically operated device to
warn when discharge takes place.
Note:The discharge will consist ofscalding
water and steam.Asphalt,roofing felt and
non-metallic rainwater goods may be
damaged by such discharges.
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

7
7
Subtract the resistance for 4 No. 22mm elbows at 0.8m
each = 3.2m
Therefore the permitted length equates to: 5.8m
5.8m is less than the actual length of 7m therefore
calculate the next largest size.
Maximum resistance allowed for a straight length of
28mm pipe (D2) from a G1/2 temperature relief valves
equates to 18m.
Subtract the resistance of 4 No. 28mm elbows at 1.0m
each = 4.0m
Therefore the maximum permitted length equates to:
14m
As the actual length is 7m, a 28mm (D2) copper pipe
will be satisfactory.
WARNINGS
• Under no circumstances should the factory
fitted temperature/pressure relief valve be re-
moved other than by a competent person.To do
so will invalidate any guarantee or claim.
• The cold water combination valve assembly
must be fitted to the mains water supply to the
CENTERSTORE Solar cylinder.
• No control or safety valves should be tampered
with or used for any other purpose.
• The discharge pipe should not be blocked or
used for any other purpose.
• The tundish should not be located adjacent to
any electrical components.
Table 3: Sizing of copper discharge pipe (D2) for common temperature relief valve outlet sizes
Fig.5:Typical discharge pipe arrangement (extract from Building Regulation G3 Guidance section)
Valve outlet size
Minimum size of
discharge pipe
D1
Minimum size of
discharge pipe
D2 from tundish
Maximum
resistance
allowed, expressed
as a length of
straight pipe (i.e.
no elbows or
bends)
Resistance
created by each
elbow or bend
G1/2 15mm
22mm
28mm
35mm
up to 9m
up to 18m
up to 27m
0.8m
1.0m
1.4m
G3/4 22mm
28mm
35mm
42mm
up to 9m
up to 18m
up to 27m
1.0m
1.4m
1.7m
G1 28mm
35mm
42mm
54mm
up to 9m
up to 18m
up to 27m
1.4m
1.7m
2.3m
Fixed grating
Discharge below
fixed grating
(Building Regulation
G3 section 3.9d gives
alternative points
of discharge)
Trapped
gully
Discharge pipe (D2) from tundish,
with continuous fall. See Building
Regulation G3 section 3.9d i-iv,
Table 4 and worked example
300mm
minimum
500mm maximum
Metal discharge pipe (D1) from
Temperature relief valve to tundish
Tundish
Safety device
(e.g. Temperature
relief valve)
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

8
Fig. 6:Typical installation - schematic
Fig.7 Electrical Connections (Schematic)
AUXILLARY HEATING CONTROL
EXPANSION
VESSEL
T&P RELIEF
VALVE
TO HOT
OUTLETS
MAINS
WATER
SUPPLY
ISOLATING
VALVE (NOT
SUPPLIED)
TUNDISH
DISCHARGE
PIPE
DRAIN COCK
(NOT SUPPLIED)
SOLAR PRIMARY
RETURN
SOLAR PRIMARY
FLOW
SOLAR
CONTROLS
HOUSING
INLET
SECONDARY RETURN TAPPING
(IF REQUIRED)
COLD WATER
COMBINATION
VALVE
(2-PIECE)
BALANCED
COLD WATER
CONNECTION
(IF REQUIRED)
AUX. PRIMARY
RETURN
AUX. PRIMARY
FLOW
BOOST ELEMENT/
AUX. CONTROL
HOUSING
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

9
9
CONNECTION TO SOLAR PRIMARY CIRCUIT
The lower (solar) coil of the CENTERSTORE Solar
cylinder must be connected to a fully pumped solar
primary circuit.The connections are suitable for 22mm
copper pipe direct to the compression fittings provid-
ed.The connections are also threaded 3/4”BSP male
parallel should BSP be required.
The solar primary circuit should have its own dedicated
circulating pump and safety controls which must be
installed as per the manufacturer’s instructions.
Fig. 8: Solar Control Connections
The solar controller and solar primary circulation
pump must be wired via the over-temperature cut-out
mounted in the lower solar controls housing (see Fig.
8).This will ensure that the heat input to the solar coil
is interrupted in the event of the cylinder over-heating.
There must also be suitable check (non-return) valves
installed in the solar primary flow and return to pre-
vent the possibility of any thermo-syphoning if the
solar circulation is stopped.
INSTALLATION - SOLAR PRIMARY
CONTROL OF SOLAR PRIMARY CIRCUIT
Temperature control of the CENTERSTORE Solar cylin-
der must be carried out using a suitable proprietory
Solar Controller/Programmer.The cylinder tempera-
ture sensing probe (supplied with the solar controller)
should be fully inserted into the pocket provided on
the CENTERSTORE Solar cylinder and its cable secured
using the cable clamps on the controls housing ( see
Fig. 8 ).
Connection to the solar controller should be in accord-
ance with manufacture’s instructions.The solar control-
ler should be programmed to give a cylinder tempera-
ture of approximately 60°C ( maximum 70°C ).
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

10
PLUMBING CONNECTIONS
CENTERSTOER Solar cylinders require the following
pipework connections.
• Cold water supply to and from inlet controls.
• Outlet to hot water draw off points.
• Discharge pipework from valve outlets to
tundish
• Connection to the auxillary primary circuit.
Primary connections are 22mm compression. However,
3/4”BSP parallel threaded fittings can be fitted to the
primary coil connections if required.
ELECTRICAL SUPPLY (FIG. 7)
All units are fitted with a 3kW immersion heater and a
combined thermostat and thermal cut-out to control
the primary heating source. The CENTERSTORE Solar
cylinder MUST be earthed.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the supply cir-
cuits must be protected by a suitable fuse and double
pole isolating switch with a contact separation of at
least 3mm in both poles. All connections are made to
the terminal block located under the terminal cover
mounted on the side of the unit.The supply cable(s)
must be routed through the cable grip(s) in the termi-
nal housing.
DISCONNECT FROM MAINS SUPPLY BEFORE
REMOVING ANY COVERS. Never attempt to replace
the immersion heater(s) other than with the recom-
mended CENTERSTORE immersion heater(s).
DO NOT BYPASS THE THERMAL CUT-OUTS IN ANY
CIRCUMSTANCES. Ensure the two male spade termi-
nations on the underside of the combined thermostat
and thermal cut-out are pushed firmly onto the corre-
sponding terminations on the element plate assembly.
In case of difficulty contact service support; contact
details available at the back of this booklet.
BOILER SELECTION
The boiler should have a control thermostat and non
self-resetting thermal cut-out and be compatible with
unvented storage water heaters.
Where use of a boiler without a thermal cut-out is
unavoidable a“low head” open vented primary circuit
should be used.The feed and expansion cistern head
above the CENTERSTORE Solar cylinder should not
exceed 2.5m.
AUXILLARY PRIMARY CIRCUIT CONTROL
The 2-port motorised valve supplied with the CENTER-
STORE Solar cylinder MUST be fitted to the primary
auxillary circuit flow to the CENTERSTORE Solar cylinder
heat exchanger and wired in series with the indirect
thermostat and thermal cut-out fitted to the unit.
Primary circulation to the CENTERSTORE Solar cylinder
heat exchangers must be pumped; gravity circulation
WILL NOT WORK.
INSTALLATION - AUXILLARY
HEATING COIL
SPACE AND HEATING SYSTEMS CONTROLS
The controls provided with the CENTERSTORE
Solar cylinder will ensure the safe operation of
the unit within the central heating system. Other
controls will be necessary to control the space
heating requirements and times that the system
is required to function. (See Fig. 7)
The CENTERSTORE Solar cylinder is compatible
with most heating controls, examples of electrical
circuits are shown in Figs. 9 and 10. However,
other systems may be suitable, refer to the
controls manufacturers’ instructions, supplied
with the controls selected, for alternative system
wiring schemes.
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

11
11
Fig. 9: Schematic wiring diagram - Basic 2 x 2 port valve system
Fig.10: Schematic wiring diagram - 3 port mid position valve system. N.B. Must be used in conjunction with 2 port
zone valve supplied
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

12
At the time of commissioning, please ensure all relevant
sections of the Benchmark Checklist, located on Page 18
and 19 of this document, are completed.
FILLING THE UNIT WITH WATER
• Check expansion vessel pre-charge pressure.
The vessel is supplied pre-charged to 3.5 bar to
match the control pressure of the pressure re-
ducing valve.The pre-charge pressure is checked
using a car tyre gauge by unscrewing the plastic
cap opposite the water connection.
• Check all connections for tightness including
the immersion heater(s). An immersion heater
key spanner is supplied for this purpose.
• Ensure the drain cock is CLOSED.
• Open a hot tap furthest from the CENTERSTORE
Solar cylinder.
• Open the mains stop cock to fill the unit.When
water flows from the tap, allow to run for a few
minutes to thoroughly flush through any resi-
due, dirt or swarf, then close the tap.
• Open successive hot taps to purge the system
of air.
SYSTEM CHECKS
• Check all water connections for leaks and rectify
as necessary.
Turn off mains water supply.•
• Remove the pressure reducing valve headwork
to access the strainer mesh; clean and re-fit.
• Manually open, for a few seconds, each relief
valve in turn,checking that water is discharged
and runs freely through the tundish and out at
the discharge point.
• Ensure that the valve(s) reseat satisfactorily.
SOLAR PRIMARY CIRCUIT
Fill the solar primary circuit following the instruc-
tions provided with the solar hydraulic controls.The
cylinder temperature control probe supplied with the
solar controller must be fully inserted into the pocket
in the lower controls housing and the cable securely
clamped. Heating by the solar primary circuit is
controlled by the solar controller; refer to the manu-
facturer’s installation instructions for details of how to
set up and connect the solar primary circuit.The solar
controller should be programmed to give a maxi-
mum storage temperature in the CENTERSTORE Solar
cylinder of 70oC, (60oC is recommended to minimise
scaling).
SECONDARY HEATING COIL
Fill the indirect secondary circuit following the boiler
manufacturer’s commissioning instructions.To en-
sure the CENTERSTORE Solar cylinder auxillary heat
exchanger is filled, the 2 port motorised valve (sup-
plied) should be manually opened by moving the lever
on the motor housing to the FLUSHING ONLY setting.
When the circuit is full return the lever to the MANUAL
position. Switch on the boiler, ensure the programmer
is set to Domestic Hot Water and allow the CENTER-
STORE Solar cylinder to heat up to a normal working
temperature (60oC recommended, approximately
graduation 4 on the thermostat). If necessary the
temperature can be adjusted by inserting a flat bladed
screwdriver in the adjustment knob (located on top
of the thermostat mounting bracket - see Fig.11) and
rotating.The minimum thermostat setting is 10oC.The
adjustment range 1 to 5 represents a temperature
range of 30 to 70oC. Check the operation of the indirect
thermostat and 2-port motorised valve and that no
water has issued from the expansion relief valve or
temperature/pressure relief valve during the heating
cycle.
COMMISSIONING
Fig. 11: Indirect thermostat and thermal cut-out
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

13
13
DESCALING IMMERSION HEATER(S)
Before removing the immersion heater(s) the unit
must be drained. Ensure the water, electrical supply,
boiler and solar primary circuit are OFF before
draining. Attach a hosepipe to the drain cock having
sufficient length to take water to a suitable discharge
point below the level of the unit. Open a hot tap close
to the unit and open drain cock to drain unit.
Open the cover(s) to the immersion heater housing(s)
and disconnect wiring from immersion heater(s).
Remove the thermostat by carefully pulling outwards
from the immersion heater. Remove thermostat capil-
lary sensors from the pockets on the immersion heater.
Unscrew immersion heater backnut(s) and remove
immersion heater from the unit. A key spanner is sup-
plied with the CENTERSTORE Solar cylinder for easy
removal/tightening of the immersion heater(s). Over
time the immersion heater gasket may become stuck
to the mating surface.To break the seal insert a round
bladed screwdriver into one of the pockets on the im-
mersion heater and gently lever up and down.
Carefully remove any scale from the surface of the
element(s). DO NOT use a sharp implement as damage
to the element surface could be caused. Ensure seal-
ing surfaces are clean and seals are undamaged, if in
doubt fit a new gasket. ( part number 95 611 822 ).
Replace immersion heater(s) ensuring the right angled
element hangs vertically downwards towards the base
of the unit. It may be helpful to support the immersion
heater using a round bladed screwdriver inserted into
one of the thermostat pockets whilst the backnut is
tightened. Replace thermostat capillaries into pocket.
Replace the immersion heater thermostat by carefully
plugging the two male spade terminations on the un-
derside of the thermostat head into the corresponding
terminations on the element. Rewire, check, close and
secure immersion heater housing cover(s).
MAINTENANCE REQUIREMENTS
Unvented hot water systems have a continuing main-
tenance requirement in order to ensure safe working
and optimum performance. It is essential that the
relief valve(s) are periodically inspected and manually
opened to ensure no blockage has occurred in the
valves or discharge pipework. Similarly cleaning of
the strainer element and replacement of the air in the
expansion vessel will help to prevent possible opera-
tional faults.
The maintenance checks described below should be
performed by a competent installer on a regular basis,
e.g. annually to coincide with boiler maintenance.
After any maintenance, please complete the relevant
Service Interval Record section of the Benchmark Check-
list located on Page 19 of this document.
SAFETY VALVE OPERATION
Manually operate the temperature/pressure relief
valve for a few seconds. Check water is discharged and
that it flows freely through the tundish and discharge
pipework. Check valve reseats correctly when released.
NOTE: Water discharged may be very hot!
Repeat the above procedure for the expansion valve.
STRAINER
Turn off the cold water supply, boiler and immersion
heaters.The lowest hot water tap should then be
opened to de-pressurise the system. Remove the pres-
sure reducing valve cartridge to access the strainer
mesh.Wash any particulate matter from the strainer
under clean water. Re-assemble ensuring the seal is
correctly fitted, DO NOT use any other type of sealant.
MAINTENANCE
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

14
EXPANSION VESSEL CHARGE PRESSURE
Remove the dust cap on top of the vessel. Check the
charge pressure using a tyre pressure gauge.The pres-
sure (with system de-pressurised) should be 3.5bar.
If it is lower than the required setting it should be re-
charged using a tyre pump (Schrader valve type). DO
NOT OVER CHARGE. Re-check the pressure and when
correct replace the dust cap.
RE-COMMISSIONING
Check all electrical and plumbing connections are
secure. Close the drain cock.With a hot tap open, turn
on the cold water supply and allow unit to refill. DO
NOT switch on the immersion heater(s) or boiler until
the unit is full.When water flows from the hot tap
allow to flow for a short while to purge air and flush
through any disturbed particles. Close hot tap and
then open successive hot taps in system to purge any
air.
When completely full and purged check system for
leaks.The heating source (immersion heater(s), boiler
or solar primary circuit) can then be switched on.
WARNINGS
IF WATER ISSUES FROM THE TEMPERATURE/PRES-
SURE RELIEF VALVE ON THE CENTERSTORE SOLAR
CYLINDER SWITCH OFF ELECTRICAL SUPPLY TO THE
IMMERSION HEATER(S), SHUT DOWN THE BOILER
AND SHUT DOWN THE SOLAR PRIMARY CIRCUIT.
DO NOT TURN OFF ANY WATER SUPPLY. CONTACT
A COMPETENT INSTALLER FOR UNVENTED WATER
HEATERS TO CHECK THE SYSTEM.
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES
FITTED TO THE CENTERSTORE SOLAR SYSTEM. IF
A FAULT IS SUSPECTED CONTACT A COMPETENT
INSTALLER.
TEMPERATURE CONTROLS - SOLAR
Temperature control of the solar primary coil is by
means of solar differential temperature controller.
This will usually have been set during commissioning
to give a storage temperature of approximately 60oC.
Refer to user instructions supplied with the controller
for details of how to adjust this if required.
An immersion heater is also provided for use should
the indirect heat source be shut down for any purpose.
The immersion heater control temperature is set using
the immersion heater thermostat.
DO NOT bypass the thermal cut-out(s) in any cir-
cumstances.
USER INSTRUCTIONS
BENCHMARK
CENTERSTORE, is a licensed member of the Bench-
mark Scheme which aims to improve the standards
of installation and commissioning of domestic heating
and hot water systems in the UK and to encourage
regular servicing to optimise safety, efficiency and
performance.
Benchmark is managed and promoted by the Heating
and Hotwater Industry Council. For more information
visit www.centralheating.co.uk.
Please ensure that the installer has fully completed the
Benchmark Checklist on Page 18 of this manual and
that you have signed it to say that you have received
a full and clear explanation of its operation.
The installer is legally required to complete a com-
missioning checklist as a means of complying with
the appropriate Building Regulations (England and
Wales).
All installations must be notified to Local Area Build-
ing Control either directly or through a Competent
Persons Scheme. A Building Regulations Compliance
Certificate will then be issued to the customer who
should, on receipt, write the Notification Number on
the Benchmark Checklist.
This product should be serviced regularly to optimise
its safety, efficiency and performance. The service
engineer should complete the relevant Service Record
on the Benchmark Checklist after each service.
The Benchmark Checklist may be required in the
event of any warranty work and as supporting
documentation relating to home improvements in the
optional documents section of the Home Improve-
ments Pack.
TEMPERATURE CONTROLS – (Fig. 7)
The CENTERSTORE Solar cylinders are fitted with an in-
direct thermostat and thermal cut-out.These controls
must be wired in series with the 2-port motorised zone
valve supplied to interrupt the flow of primary water
around the heat exchanger coil when the control tem-
perature has been reached.The controls are located
within the upper white terminal housing along with
the immersion heater thermostat.The thermostat tem-
perature adjustment is made by inserting a flat bladed
screwdriver in the adjustment knob and rotating.The
minimum thermostat setting is 10oC.The adjustment
range 1 to 5 represents a temperature range of 30 to
70oC (60oC will be approximately position 4). If in any
doubt contact a competent electrician.
An immersion heater is also provided for use should
the indirect heat source be shut down for any purpose.
The immersion heater control temperature is set using
the immersion heater thermostat, see User Instructions
section for details.
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

15
15
IMPORTANT
•After servicing, complete the relevant
Service Interval Record section of the Bench-
mark Checklist located on page 18 and 19 of
this document.
•Servicing should only be carried out by com-
petent persons in the installation and mainte-
nance of unvented water heating systems.
•Any spare parts used MUST be authorised CEN-
TERSTORE parts.
•Disconnect the electrical supply before remov-
ing any electrical equipment covers.
•NEVER bypass any thermal controls or operate
system without the necessary safety valves.
•Water contained in the CENTERSTORE Solar
cylinder may be very hot, especially following
a thermal control failure.Caution must be taken
when drawing water from the unit.
SPARE PARTS
A full range of spare parts are available for the
CENTERSTORE cylinder range (See Table 4). Refer
to the technical data label on the unit to identify
the model installed and ensure the correct part is
ordered. You will need to quote the serial number
and the guarantee code, which are printed on the
data label.
OPERATIONAL FAULTS
Operational faults and their possible causes are
detailed in the Fault Finding section of this book. It
is recommended that faults should be checked by a
competent installer.
The air volume within the expansion vessel will peri-
odically require recharging to ensure expanded water
is accommodated within the unit. A discharge of water
INTERMITTENTLY from the expansion valve will indi-
cate the air volume has reduced to a point where it can
no longer accommodate the expansion.
FAULT FINDING AND SERVICING
FLOW PERFORMANCE
When initially opening hot outlets a small surge in flow
may be noticed as pressures stabilise.This is quite
normal with unvented systems. In some areas cloudi-
ness may be noticed in the hot water.This is due to
aeration of the water, is quite normal and will quickly
clear.
Table 4: Spares
.oNtraPnoitpircseD
Immersion heater 95 606 961
Immersion heater gasket 95 611 822
Immersion heater backnut 95 607 869
Immersion heater key spanner 95 607 861
Tundish 95 605 838
Expansion valve cartridge - 6bar 95 605 864
E x p a n s io n v a lv e c o mp le t e - 6 b a r 95 607 030
Cold water combination valve
complete 95 605 047
C o ld w a t e r c o mb in a t io n v a lv e b o d y 95 605 048
Pressure reducing valve cartridge
3 . 5 b a r 95 607 029
T
emperature/Pressure Relief Valv e 95 605 810
Indirect thermostat 95 612 697
Indirect thermal cut-out 95 612 698
Motorised valve 2 port 95 605 049
Te rmina l cover 95 614 094
4 Way terminal block 95 607 902
Accessory kit (indirect and without
expansion vessel)
95 607 968
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
95 612 026
Combined thermostat and
thermal cut out
17
18
Blanking Plate Assembly 95 607 064
19
12
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

16
Fig 12: Spares Diagram
15
319
2
16
13
12
13 16
2
1317
15
11
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

17
17
FAULT FINDING
The Fault Finding chart ( Table 5 ) will enable operation-
al faults to be identified and their possible causes recti-
fied.Any work carried out on the CENTERSTORE Solar
cylinder water heater and its associated controls MUST
be carried out by a competent installer for unvented
water heating systems. In case of doubt contact Service
Support. (see contact details on back page).
Table 5: Fault Finding Chart
WARNING
Table 6: Standing heat losses (based on an ambient air
temperature of 20oC and a stored water temperature
of 65oC)
CENTERSTORE products are manufactured from many
recyclable materials. At the end of their useful life they
should be disposed of at a Local Authority Recycling Cen-
tre in order to realise the full environmental benefits.
Insulation is by means of an approved CFC/HCFC free
polyurethane foam with an ozone depletion factor of
zero.
While the following Checklist can be used for any installation covered by its description, only appliances manu-
factured by Scheme Members will be covered by the rules and requirements of the Benchmark Scheme.
OTHER INFORMATION ENVIRONMENTAL INFORMATION
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES
OR CONTROLS SUPPLIED WITH THE CENTERSTORE
SOLAR CYLINDER AS THIS WILL INVALIDATE ANY
GUARANTEE
YDEMERESUACELBISSOPTLUAF
1. Mains supply off. 1. Che ck and o pe n st o p c ock.
2. Strainer blocked. 2. Turn off water supply. Remove st rainer
and clean (see Maintenance section).
3. Co ld W at e r Co mbinat io n V alve
incorrectly fitted.
3. Check and refit as required.
1. INDIRECT programmer set to
Central Heatin
g
onl
y
.
1. Check. Set to a Domestic Hot Water
p
ro
g
ramme.
2. INDIRECT bo iler not w orking. 2. Chec k boile r ope rat ion. If fault is
suspected consult boiler manufacturer's
inst ruc t ions.
3. INDIRECT thermal cut-out has
operated.
3. Check. Reset by pushing button on cut -
out. Check operation of indirect
thermostat.
4. INDIRECT motorised valve not
connected correctly.
4. Check wiring and/or plumbing
connections to motorised valve (see Fig. 9).
1. INTERMITTENTLY
Expansion Ve sse l charge pre ssure
has reduced below 3.5bar.
1. See Maintenance section for re-charging
procedure.
2. CONTINUALLY
a. Cold W at e r Combinat ion V alve
Pressure Reducer not working
correctly.
2a. Check pressure from Cold Water
Combinat ion V alve . If g re at e r t han 3. 5bar
replace Pressure Reducer cartridge.
b. Expansion Valve seat damaged. 2b. Remove Expansion Valve cartridge.
Che ck condit ion of seat. If necessary fit
new Expansion Valve cartridge.
W at er discharge s from T &P
Re lie f V alve
1. T he rmal cont ro l failure NOT E
water will be very hot.
1. Sw it ch o ff pow e r t o immersion he at er(s)
and shut dow n boiler. DO NOT turn off
w at er supply. W hen discharge st ops check
all t he rmal cont ro ls, re plac e if fault y.
Milky w at er
1. Oxygenat ed w ater. 1. W ater from a pressurised system releases
oxygen bubbles when flowing. The
milkiness w ill disappear after a short w hile.
No hot water flow
W at e r from hot t aps is c old
W at er discharge s from
Exp ansio n V alve
per day
(kWh/24h)
per year
(kWh/365d)
190 1.65 642
210 1.75 664
250
300 2.33
Nominal
Capacity
(litres)
Standing Heat Loss
1.98 670
850
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

18
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

19
19
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818

20 36006052 issue 4
The policy of CENTERSTORE is one of continuous product development and, as such, we reserve the right to
change specifications without notice.
The CENTERSTORE Solar stainless steel vessel carries a full 25 year parts guarantee against
faulty manufacture or materials provided that:
• It has been correctly installed as per the instructions contained in the instruction manual
and all relevant Codes of Practice and Regulations in force at the time of installation.
• The Benchmark Checklist has been completed upon commissioning and the Benchmark
Service Record is completed for each service.
• It has not been modified in any way, other than by CENTERSTORE.
• It has not been frost damaged.
• It has only been used for the storage of potable water.
• It has not been tampered with or been subjected to misuse or neglect.
The fault is not scale related.•
• Within 60 days of installation the user completes and returns the certificate supplied along
with the proof of purchase to register the product.
• It has been installed in the United Kingdom.
The expansion vessel is guaranteed for a period of 2 years from the date of purchase.The
CENTERSTORE Solar’s components,immersion heater and thermal controls are guaranteed
for a period of 2 years from the date of purchase.Evidence of purchase and date of supply
may be required.The unit is not guaranteed against damage due to frost.The guarantee is
transferable.This guarantee does not affect your statutory rights.
GUARANTEE
TECHNICAL SUPPORT & SPARES
For all technical support, replacement parts and service issues please
contact:
CENTERSTORE
Brooks House,
Coventry Road,
Warwick,
CV34 4LL
Tel: [phone]
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - [email protected] 0844 556 1818