Beretta HYBRID STOR 750 User manual

Installation Manual
Solar | combination storage cylinder triple coil
HYBRID STOR 430 - 550 - 750 - 1000
Installation Manual
EN

INSTALLATION MANUAL
2
Dear Installer,
Thank you for choosing a BERETTA HYBRID STOR, combination storage cylinder. You have
purchased a modern and quality product.
This instruction manual contains important instructions and precautions that must be observed
to ensure the trouble-free installation and efficient functioning of your BERETTA HYBRID STOR
combination storage cylinder.
Please accept our renewed thanks for your purchase.
Beretta
MODEL CODE
HYBRID STOR 430 20051862
HYBRID STOR 550 20051863
HYBRID STOR 750 20051864
HYBRID STOR 1000 20051866
RANGE
The following symbols are used in this manual:
b CAUTION! = Indicates actions that require caution and adequate preparation
aSTOP! = Identifies actions that you MUST NOT do
This manual, Code 20051873 - Rev. 3 (12/15) is made up of 24 pages.

3
CONTENTS
1 SAFETY PRECAUTIONS ........................................................................... 4
2 PRODUCT DESCRIPTION ......................................................................... 5
2.1 Description..........................................................................................................................................5
2.2 Identification .......................................................................................................................................5
2.3 Design.................................................................................................................................................6
2.4 Technical specifications......................................................................................................................7
2.5 Accessories ......................................................................................................................................11
2.6 Water circuit......................................................................................................................................12
2.7 Dimensions and water connections .................................................................................................13
3 INSTALLATION ......................................................................................... 15
3.1 Unpacking the product.....................................................................................................................15
3.2 Handling ...........................................................................................................................................15
3.3 Place of installation of the combined storage cylinder ....................................................................17
3.4 Installation in older systems and systems requiring modernisation ................................................17
3.5 Location of probes............................................................................................................................17
3.7 Initial start-up ....................................................................................................................................18
3.6 Preparing for initial start-up ..............................................................................................................18
3.8 Checks during and after initial start-up............................................................................................18
3.9 Preparing for extended periods of disuse........................................................................................19
3.11 Maintenance .....................................................................................................................................20
3.12 Cleaning............................................................................................................................................20
4 TROUBLESHOOTING .............................................................................. 21

INSTALLATION MANUAL
4
b As soon as you open the packaging,
check immediately that the contents are
all present and undamaged. Contact the
reseller from whom you purchased the
product if you notice any problems.
b This BERETTA HYBRID STOR combi-
nation storage cylinder must be installed
by a qualified installer. On completion of
the installation, the installer must issue
the owner with a declaration of confor-
mity confirming that the installation has
been completed to the highest stan-
dards in compliance with the instructions
provided in this instruction manual, and
that it conforms to all applicable laws
and standards.
b This BERETTA HYBRID STOR combi-
nation storage heater must only be used
for the purpose specified and for which it
is designed. The manufacturer declines
all responsibility, contractual or other, for
damage to property or injury to persons
or animals caused by improper installa-
tion, adjustment, maintenance or use.
b If you notice any water leaking from the
cylinder, disconnect it immediately from
the mains electricity supply, shut off the
water supply, and notify your Technical
Assistance Centre or a qualified techni-
cian immediately.
b This combination storage cylinder must
be serviced at least once a year.
If the combination storage cylinder is not
going to be used for an extended period
of time, prepare it for shut-down as fol-
lows:
- Turn the system’s main power switch
OFF
- Drain the solar water circuit
- Close the fuel cock and heating water
cock
- Drain the central heating circuit and
domestic hot water circuit if there is
any risk of freezing
b Anti-freeze (propylene glycol) is availa-
ble separately and must be mixed with
water in a percentage varying from 30%
to 50%.
b This instruction manual is an integral
part of the appliance. It must be kept
safe and must ALWAYS accompany the
appliance, even if it is sold to another
owner or transferred to another user or
to another installation. If you damage or
lose this manual, order a replacement
immediately from your local Technical
Assistance Centre.
The operation of any appliance that uses
electrical power and water demands that a
number of fundamental safety precautions be
respected. In particular:
aDo not allow children or infirm persons to
operate the combination storage cylin-
der unsupervised.
aDo not touch the combination storage
cylinder when barefoot or wet.
aNever clean or service the combination
storage cylinder without first disconnec-
ting it from the mains electricity supply
by turning the main power switch and
the control panel switch OFF.
aDo not interfere with any control devi-
ces without specific authorisation and
instructions from the manufacturer.
aDo not leave packaging material within
the reach of children, since it can beco-
me a potential hazard.
aIf the pressure in the solar heating circuit
drops, do not top up with water alone,
since this increases the risk of damage
from freezing.
aDo not use connections or safety devi-
ces or fittings (expansion vessels, pipes,
insulation) that are not specifically desi-
gned and tested for use in solar heating
installations.
1 SAFETY PRECAUTIONS

5
2 PRODUCT DESCRIPTION
2.1
Description
HYBRID STOR triple coil combination storage
cylinders come in the form of an inertial (buf-
fer) storage cylinder with three internal coils.
The bottom coil receives heat from the solar
circuit while the top coil receives heat from the
boiler. A third coil in stainless steel produces
domestic hot water.
The most important technical features of these
combination storage cylinders are:
- The cylinder and coils are specially desig-
ned and shaped for optimum performance
in terms of stratification, heat exchange and
replenishment times.
- The stainless steel, rapid heat exchan-
ge coil for domestic hot water production
is bacteriologically inert and guarantees
maximum hygiene and reduced lime scale
deposits.
- Water fittings are available at different
heights, permitting different boilers to be
used without reducing the stratification
effect.
- CFC-free polyurethane insulation and an
elegant external casing reduce heat loss
and improve efficiency.
- Excellent flexibility permits use in both high
and low temperature systems.
- Dimensions are extremely compact thanks
to the clever combination of an inertial sto-
rage cylinder and domestic hot water coil.
HYBRID STOR triple coil combination storage
cylinders can be connected to a special solar
controller and can be integrated in solar hea-
ting systems in which boilers or water heaters
serve as auxiliary heat generators
2.2
Identification
HYBRID STOR combination storage cylinders are identified by three plates:
Beretta Caldaie
Via Risorgimento, 13
23900 Lecco (LC)
Beretta Caldaie
Via Risorgimento, 13
23900 Lecco (LC)
Fabrication
ModelekW
kW
Puiss.abs.sup.maxi
Pot.ass.sup.max.
Modello
Puiss.abs.inf.maxi
Pot.ass.inf.max.
BALLON SOLAIRE
ModeleFabrication
Code Année
Pression service max.
Alimentat. élect.
bar
V-Hz
Capacité ballonl
067659IF
Collegamento di terra obbligatorio - Raccordement a la terre obligatoire
W
Puissance élect. absorbée
Puissance absorbée serpentin sup.[T° Primaire 80°C] kW
Débit specifique sup. [∆T 35°C] l/1'
BOLLITORE SOLARE
Modello Matricola
Codice Anno
Massima potenza assorbita sup.[T° Primario 80°C]
Portata specifica sup.[∆T 35°C]
Press. esercizio max.
Capacità del bollitore
Potenza elettric assorbita
Alimentazione elettrica
m
2
m
2
Superficie serpentino superiore
Surface serpentin supérieur
Superficie serpentino inferiore
Surface serpentin inférieur
b If these plates or any other means of clearly iden-
tifying the product are defaced, removed or lost, pro-
per installation and servicing may be rendered diffi-
cult.
– Data plate
This lists the technical specifications and
performance of the product.
– Product identification plate
This states the name of the product.
– Serial number plate
This specifies the serial number, model,
consumption and capacity.

INSTALLATION MANUAL
6
1
2
5
7
10
6
12
11
9
3
4
8
13
14
7
15
16
18
20
21
22
23
17
19
1 - Insulation
2 - Domestic cold water inlet
3 - Inertial storage cylinder
4 - Bottom coil
5 - Temperature sensor socket
6 - Sleeve for electric heating element (not sup-
plied)
7 - Boiler temperature sensor socket
8 - Top coil
9 - Storage cylinder temperature gauge
10 - Domestic hot water outlet
11 - DHW coil
12 - Vent valve fitting
13 - Inlet from boiler
14 - Inlet from 2nd boiler
15 - Central heating outlet
16 - Return to 2nd boiler
17 - Inlet from solar collector
18 - 50° C water return
19 - Return to solar collector
20 - Inlet from condensing boiler / 50°
C water return
21 - Solar controller temperature sen-
sor socket
22 - Return to condensing boiler /
Filling
23 - 30° C water return / Drain
2.3
Design

7
2.4
Technical specifications
(*) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with heat generator of suitable power, adjusted for a flow rate of 3000 l/h.
DESCRIPTION HYBRID STOR
430 550 750 1000
Type of inertial storage cylinder Non vitrified
Inertial storage cylinder layout Vertical
Heat exchanger layout Vertical
Primary coils Smooth steel pipe
DHW coil Corrugated pipe in AISI 316 L stainless steel
Inertial storage cylinder capacity 407 520 732 898 l
Diameter with insulation 810 810 1000 1000 mm
Diameter without insulation 650 650 790 790 mm
Height 1650 2000 1855 2180 mm
Insulation thickness 70 90 mm
Temperature sensor socket diameter (boiler and solar
system)
16 Ø mm
Temperature sensor socket diameter 8Ø mm
Temperature gauge sensor socket diameter 1/2" M Ø
Top primary coil water capacity 7,1 8,0 10,0 10,0 l
Bottom primary coil water capacity 11,0 12,8 17,4 19,8 l
DHW coil water capacity 23,6 23,6 30,4 30,4 l
Top primary coil heat exchange surface area 1,17 1,31 1,72 1,72 m2
Bottom primary coil heat exchange surface area 1,80 2,10 2,90 3,34 m2
DHW coil heat exchange surface area 4,5 4,5 5,8 5,8 m2
Power absorbed by top primary coil (*) 25,0 26,0 30,0 30,0 kW
Maximum working pressure of inertial storage cylinder 3 5 bar
Maximum working temperature of inertial storage cylinder 99 °C
Maximum working pressure of primary coils 10 bar
Maximum working pressure of DHW coil 6 bar
Maximum working temperature of primary coils 99 °C
Maximum working temperature of DHW coil 99 °C
Recommended surface area of solar panel 6 8 12 14 m2
Net weight 168 195 239 269 kg
Gross weight (with packaging) 189 215,5 254 284,4 kg
Heat loss according to EN 12897:2006 at ∆T=45 °C 60 68 156 175 W
Energy efficiency class B B D D

INSTALLATION MANUAL
8
CONFIGURATION A
HYBRID STOR Boiler
CONFIGURATION B
HYBRID STOR Boiler
Descrizione HYBRID STOR
430 550 750 1000
Domestic hot water
production (*)
3050 3300 3150 3200 l/h
Domestic hot water
production (**)
1970 2115 1980 2250 l/h
Water draw in 10 minutes with mean ∆T of 35° and
primary storage tank at:
90°C 600 670 800 800 l
80°C 425 470 670 670 l
70°C 370 400 570 570 l
60°C 220 280 285 285 l
Useful non-solar
volume (Vbu)
320 430 565 705 l
(*) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 3000 l/h.
(**) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 1500 l/h.
Descrizione HYBRID STOR
430 550 750 1000
Domestic hot water
production (*)
2300 2400 2600 2650 l/h
Domestic hot water
production (**)
1650 1750 1900 1950 l/h
Water draw in 10 minutes with mean ∆T of 35° and
primary storage tank at:
90°C 350 400 420 560 l
80°C 260 310 350 470 l
70°C 200 220 285 350 l
60°C 130 160 200 240 l
Useful non-solar
volume (Vbu)
190 235 325 435 l
(*) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 3000 l/h.
(**) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 1500 l/h.
Performance of HYBRID STOR combination storage cylinder with boiler connected in:

9
CONFIGURATION C
HYBRID STOR Boiler
CONFIGURATION D
HYBRID STOR Boiler
Descrizione HYBRID STOR
430 550 750 1000
Domestic hot water
production (*)
690 790 1100 1270 l/h
(*) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 3000 l/h.
Descrizione HYBRID STOR
430 550 750 1000
Domestic hot water
production (*)
610 640 750 750 l/h
(*) With ∆T = 35°C and primary temperature = 80°C.
Performance achieved with boiler of suitable power
configured for a flow rate of 3000 l/h.
Performance of HYBRID STOR combination storage cylinder with boiler connected in:

INSTALLATION MANUAL
10
Pressure drop
HYBRID STOR TOP COIL
Pressure drop
HYBRID STOR BOTTOM COIL
PRESSURE DROP (mbar)
FLOW RATE (l/h)
600
700
800
900
500
400
300
200
100
0
0 1000 2000 3000 4000 5000 6000
430 - 550
750 - 1000
PRESSURE DROP (mbar)
FLOW RATE (l/h)
600
700
800
900
500
400
300
200
100
0
0 1000 20003000 4000
550
430
750
1000

11
Pressure drop
HYBRID STOR DHW COIL
PRESSURE DROP (mbar)
FLOW RATE (l/h)
600
700
500
400
300
200
100
0
0 1000 20003000 4000 5000
550
750-1000
430
2.5
Accessories
The following accessories are available, to be ordered separately.
ACCESSORY CODE
Single phase heating element kit, 1,5 kW 1" 1/2 20015431
Single phase heating element kit, 2,2 kW 1" 1/2 4383271
Single phase heating element kit, 3 kW 1" 1/2 4383272
Three phase heating element kit, 3,8 kW 1" 1/2 20020707
Connection hose + bracket for 18 litre expansion vessel 1150499

INSTALLATION MANUAL
12
UAC
MC
MC2
RC2
UR
R50
M
SB
R
RE
MCON / R50
RCON / CB
R30
EAF
80°C
70°C
60°C
50°C
40°C
30°C
b The denomination of the water fittings refers to a theoretical system configuration.
b HYBRID STOR combination storage cylinders are delivered without a filling pump. A suitably rated pump
must be provided and installed separately.
For further information on the recommended solar heating circuit flow rate, see the installation instructions
for the water outlet and return kit.
UAC - Domestic hot water outlet
EAF - Domestic cold water inlet
RE - Sleeve for electric heating ele-
ment
M - Inlet from solar collector
R - Return to solar collector
MC - Inlet from boiler
MC2 - Inlet from 2nd boiler
UR - Central heating outlet
RC2 - Return to 2nd boiler
R50 - 50° C water return
MCON- Inlet from condensing boiler
RCON - Return to condensing boiler
CB - Inertial storage cylinder filling
SB - Inertial storage cylinder drain
R30 - 30° C water return
2.6
Water circuit

13
2.7
Dimensions and water connections
P
Q
C
D
SB
RCON
MCON
R50
RC2
UR
MC2
MC
A
B
EAF
UAC
VS
E
F
G
H
I
L
N
O
MR
BERETTA HYBRID STOR combination storage cylinders can be connected to even previously installed hot water
generators provided they are of adequate output power, but care must be taken to ensure correct water flow direc-
tions. They can also be easily integrated in solar heating systems.
Water fittings have the following specifications:
We recommend that you install isolating valves in the outlet and return lines.
DESCRIPTION HYBRID STOR
430 550 750 1000
A 276 494 364 364 mm
B 1312 1657 1419 1744 mm
C 177 177 75 75 mm
D 349 349 344 344 mm
E 699 899 599 599 mm
F 809 1009 899 979 mm
G 834 929 855 925 mm
H 919 1129 994 1111 mm
I 1059 1309 1089 1209 mm
L 1289 1544 1359 1476 mm
N 1410 1756 1706 2031 mm
O 1650 2000 1855 2180 mm
P 405 405 495 495 mm
Q 810 810 1000 1000 mm
Net weight 168 195 239 269 mm
UAC - Domestic hot water out (Ø 1”1/4 F)
EAF - Domestic cold water in (Ø 1”1/4 F)
M - Inlet from solar collector (Ø 1” M)
R - Return to solar collector (Ø 1” M)
MC - Inlet from boiler (Ø 1”1/4 M)
MC2 - Inlet from 2nd boiler (Ø 1” F)
UR - Central heating outlet (Ø 1” F)
RC2 - Return to 2nd boiler (Ø 1” F)
R50 - 50° C water return (Ø 1”1/4 M)
MCON - Inlet from condensing boiler (Ø 1” F)
RCON - Return to condensing boiler (Ø 1” F)
SB - Inertial storage cylinder drain (Ø 1”1/4 M)
VS - Vent valve fitting (Ø 1” F)

INSTALLATION MANUAL
14
b The DHW production coil must be filled and
pressurised before the inertial storage cylinder
is filled.
b In very hard water areas, use suitably treated
water to fill the inertial storage cylinder.
b Make sure that the combination storage cylinder
is full of water before starting up the solar heating
system.
b If the combination storage cylinder is installed in
systems that operate at pressures in excess of 4
bar, fit a pressure reducer.
b A non-return valve must be fitted at the top of the
inertial storage cylinder to prevent natural circula-
tion developing.
b Take care when opening the solar heating circuit’s
vent valves. Risk of burns!
b Make sure that the solar circuit’s expansion vessel
is able to withstand high temperatures and that its
membrane is resistant to the water-glycol mix.
b The domestic hot water system MUST INCLUDE
an expansion vessel, safety valve, automatic vent
valve and combination storage cylinder drain
cock.
b The safety valve must be connected to a suitable
collection and drain system. The manufacturer
declines all responsibility for damage caused by
water escaping from the safety valve.
b Use a thermostatic mixer valve to limit the dome-
stic hot water outlet temperature.
b If the pressure in the solar heating circuit drops,
do NOT top up with water but use the proper
water-glycol mix. Risk of freezing!
b All piping, collectors, heat exchangers and other
devices in the circuit must be subjected to proper
hydraulic seal testing.
b The choice of system components and the
method of their installation are left up to the
installer. Installers must use their expertise to
ensure proper installation and functioning in
compliance with all applicable legislation.
The lower the temperature of the heating return
(<40°C), the greater the efficiency of the solar
heating system.
b Make sure that all components chosen for use with
the system are able to withstand the thermal load
involved. In the summer months, when the solar
heating system is not used for the central heating,
steam can form inside the collectors, and tempe-
ratures can exceed 120°C even near the combina-
tion storage cylinder.
b The size of the combination storage cylinder must
be chosen to suit the solar heating system. It must
be big enough to store excess heat after the DHW
production coil has been heated without being too
big.
b Insulate the pipes from the inertial storage cylinder
to avoid heat loss.

15
1
1
1
1
HYBRID STOR combination storage cylinders
are delivered in a single package consisting
of a triple wall cardboard box (HYBRID STOR
430-550) or a plastic bag (HYBRID STOR 750-
1000) on a wooden pallet.
The following items are delivered in a plastic
bag inside the packaging:
- instruction manual
- labels with bar code
- hydraulic test certificate
- N° 3 adjustable feet (models 430-550)
- N° 4 adjustable feet (models 750-1000).
b The instruction manual is an integral
part of the combination storage cylinder.
Once located, read it thoroughly and
keep it safe.
DESCRIPTION HYBRID STOR
430 550 750 1000
A x B x H 850 x 850 x 1850 850 x 850 x 2200 1040 x 1040 x 1975 1040 x 1040 x 2300 mm
Gross weight 189 215,5 254 284,5 Kg
3 INSTALLATION
3.1
Unpacking the product
3.2
Handling
The storage cylinder, complete with pallet,
must be moved using a fork lift of suitable
lifting capacity.
Proceed as follows to remove the storage
cylinder from the pallet.
- Remove the brackets (1)
A
B
H
A
B
H
HYBRID STOR
430-550
HYBRID STOR
750-1000

INSTALLATION MANUAL
16
17
- Place a platform of about half the height of
the pallet near the storage cylinder. Make
sure the platform is able to support the
weight of the storage cylinder
- Carefully rotate and slide the storage cylin-
der off the pallet on to the platform
- Make sure that the storage cylinder is per-
fectly stable, and then remove the pallet
- Carefully rotate and slide the storage cylin-
der off the platform on to the floor
- Remove the platform. Position the storage
cylinder as required.
Fit the feet provided into the holes in the
bottom of the storage cylinder and adjust as
necessary to compensate for any unevenness
in the floor.
The casing and insulation can be removed to
facilitate access into the place of installation.
To do so, proceed as follows.
- Remove the plug (2). Unscrew the two
fixing screws and remove the top insulation
section (3).
- Remove the protective fitting plugs (4).
- Unzip the plastic cover (5).
- Remove the insulation shells (6).
Reverse the above steps to t the insulation
again.
b Make sure that the insulation shells (7)
are securely fixed in place by straps
before fitting the plastic cover. Use a
strap wrench if necessary.
b Wear suitable personal protective
equipment and use suitable safety devi-
ces.
aDo not dispose of packaging material
into the environment, or leave it within
the reach of children, since it can
become a potential hazard. Dispose of
packaging material in compliance with
applicable legislation.
2
3
4
5
6

17
3.3
Place of installation of the
combined storage cylinder
HYBRID STOR combination storage cylin-
ders can be installed in any room where there
is no specific requirement for an electrical
protection rating higher than IP X0D.
b Respect the minimum specified installa-
tion distances to ensure correct installa-
tion and access for maintenance.
SC
SC
T
S
SRS
3.4
Installation in older systems
and systems requiring moder-
nisation
When installing HYBRID STOR combination
storage cylinders in old systems or systems
requiring modernisation, always perform the
following checks:
- Make sure that the system is fitted with safety
and control devices in accordance with appli-
cable legislation and standards.
- Make sure that the circuit has been flushed
out to remove all sludge and lime scale, and
has been vented and seal tested.
- Make sure that a suitable water treatment
system is installed if the quality of the supply/
recirculation water so demands. (Refer to the
reference values listed in the table alongside).
3.5
Location of probes
HYBRID STOR combination storage cylin-
ders incorporate probe wells for fitting the
solar controller and boiler probes. Make sure
that these probes are inserted all the way.
b Installers are responsible for all con-
nections to the boiler or hot water
generator. Installers must ensure pro-
per installation and functioning in com-
pliance with all applicable legislation.
T - Temperature gauge sensor socket
(Ø 1/2" M)
SC - Boiler temperature sensor socket
(Ø 16 mm)
S - Temperature sensor socket (Ø 8 mm)
SRS - Solar controller temperature sensor
socket (Ø 16 mm)
REFERENCE VALUES
pH 6-8
Electrical conductivity below 200 mV/cm (25°C)
Chlorine ions below 50 ppm
Sulphuric acid ions below 50 ppm
Total iron below 0,3 ppm
Alkalinity M below 50 ppm
Total hardness below 35°F
Sulphur ions none
Ammonia ions none
Silicon ions below 30 ppm
≥ 0,4 m
≥ 0,6 m
≥ 0,3 m ≥ 0,4 m

INSTALLATION MANUAL
18
3.6
Preparing for initial start-up
It is essential to perform the following checks
before starting up or testing the functioning of
the combination storage cylinder. In particular,
check that:
- The supply cocks are all open in the dome-
stic water circuit.
- The water connections to the boiler and
solar heating system have been made
correctly.
- The solar heating circuit has been correctly
flushed out and filled with water-glycol mix,
and all air has been bled out of the circuit.
- Set the required temperature differential
between the collector and combination sto-
rage cylinder (see the instruction manual for
the controller).
- Start up the boiler to provide auxiliary hea-
ting for the combination storage cylinder.
3.7
Initial start-up
Heat is only transferred from the solar heating
circuit to the combination storage cylinder
when the temperature of the solar collec-
tors exceeds that in the combination storage
cylinder. It is therefore temperature differential
rather than absolute temperature that is impor-
tant in controlling solar water heating systems.
b The DHW production coil must be fil-
led and pressurised before the inertial
storage cylinder is filled.
3.8
Checks during and after initial
start-up
Once the system has been started up, per-
form the following checks:
Solar heating circuit
- Check that the flow rate in the solar heating
circuit is equivalent to 30 l/h for each m2of
collector area
- Check that the solar heating circuit has
been properly bled

19
1
2
3
4
5
06
- Check that the cold pressure of the system
is approximately 3 bar
- Check that the safety valve operates at 6
bar
- Check that all pipes in the water circuit have
been insulated in conformity to relevant
standards.
Heating circuit
- Check that the heating circuit has been
properly bled
Provided all the above checks have been
completed successfully, re-start the boiler
connected to the storage cylinder and check
the temperature settings and domestic hot
water draw rate.
3.9
Preparing for extended peri-
ods of disuse
If the combination storage cylinder is not
going to be used for an extended period of
time, prepare it for shut-down as follows:
- Shut down the boiler as instructed in its own
manual
- Turn the system’s main power switch OFF
- Drain the solar water circuit
- Close the fuel cock and heating water cock.
b Drain the domestic hot water (and
central heating) circuit if there is any
risk of freezing.
Contact your local Technical Assistance
Centre if you encounter any problems in com-
pleting the above procedure.

INSTALLATION MANUAL
20
Scheduled maintenance is essential for the safety, efficiency and long working life of your com-
bination storage cylinder. Have your combination storage cylinder serviced either by a Technical
Assistance Centre or by a qualified professional at least once a year.
Perform the following operations before begin-
ning any maintenance:
- Switch the electricity supply to the storage
cylinder’s valve group and to any associa-
ted boiler OFF at the main switch and at the
control panel
- Close the shut-off cocks for the domestic
hot water circuit
- Drain the combination storage cylinder.
3.11
Maintenance
3.12
Cleaning
EXTERNAL CLEANING
Clean the outside of the combination storage cylinder’s insulation with a soft cloth damped in
soapy water. To remove stubborn marks, use a cloth damped in a 50% mix of water and denatu-
red alcohol or a suitable cleaning product. Dry the combination storage cylinder after cleaning it.
aDo not use abrasive products, petrol or triethylene.