Riello KOMBI 800 User manual

cod. 20145353 rev. 1 05/2018
KOMBI
EN INSTALLATION, OPERATION AND MAINTENANCE MANUAL

2
RANGE
MODEL CODE
KOMBI 800 20145308
KOMBI 1000 20145313

3
Dear Installer,
Thank you for choosing a r KOMBI,combination storage cylinder. You have purchased a modern,
quality product that is designed to give dependable and safe service and to provide comfort in the
home for many years to come. Arrange for your combination storage cylinder to be serviced regularly
by an authorised rTechnical Assistance Centre. Their personnel are specially trained to keep
your storage cylinder efficient and cheap to run. Technical Assistance Centres also stock any original
spare parts that might be required.
This instruction manual contains important instructions and precautions that must be observed to
ensure the trouble-free installation and efficient functioning of your r KOMBI combination stor-
age cylinder.
Please accept our renewed thanks for your purchase.
Riello S.p.A.
Ask your Technical Assistance Centre for further information on how to get the best from your new combination storage
cylinder.

CONTENTS
4
CONTENTS
The following symbols are used in this manual:
b CAUTION! = Indicates actions that require cau-
tion and adequate preparation
aSTOP! = Identifies actions that you MUST NOT
do
This manual, Code 20145353 - Rev. 1 (05/2018) is made
up of 24 pages.
GENERAL
Safety precautions page 5
General safety information “ 5
Product description “ 6
Identification “ 6
Design “ 7
Technical specifications “ 8
Accessories “ 9
Water circuit “ 10
INSTALLATION
Unpacking the product page 11
Dimensions and weight “ 11
Handling “ 12
Assembly of the insulation and the lining “ 13
Place of installation “ 14
Installation in older systems and systems
requiring modernisation
“ 14
Water connections “ 15
Location of probes “ 17
TECHNICAL ASSISTANCE
Preparing for initial start-up page 17
Initial start-up “ 18
Checks during and after initial start-up “ 18
Preparing for extended periods of disuse “ 19
Maintenance “ 20
Cleaning and removing internal components “ 20
Troubleshooting “ 21

GENERAL
5
SAFETY PRECAUTIONS
b As soon as you open the packaging, check imme-
diately that the contents are all present and undam-
aged. Contact the r reseller from whom you
purchased the product if you notice any problems.
b This r KOMBI combination storage cylinder
must be installed by a qualified installer. On com-
pletion of the installation, the installer must issue the
owner with a declaration of conformity confirming
that the installation has been completed to the high-
est standards in compliance with the instructions
provided by r in this instruction manual, and
that it conforms to all applicable laws and stand-
ards.
b This r KOMBI combination storage heater must
only be used for the purpose specified by r 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 installation, adjustment, maintenance or
use.
b If you notice any water leaking from the cylinder,
disconnect it immediately from the mains electric-
ity supply, shut off the water supply, and notify your
r Technical Assistance Centre or a qualified
technician immediately.
b This combination storage cylinder must be serviced
at least once a year.
a Do not allow children or infirm persons to operate
the combination storage cylinder unsupervised.
a Do not touch the combination storage cylinder when
barefoot or wet.
a Never clean or service the combination storage
cylinder without first disconnecting it from the mains
electricity supply by turning the main power switch
and the control panel switch OFF.
a Do not interfere with any control devices without
specific authorisation and instructions from the
manufacturer.
a Never pull, disconnect, or twist the electrical cables
coming from the appliance even if it is disconnected
from the mains electricity supply.
The operation of any appliance that uses electrical power and water demands that a number of fundamental safety
precautions be respected. In particular:
b If the combination storage cylinder is not going to
be used for an extended period of time, prepare it
for shut-down as follows:
- 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 available separate-
ly and must be mixed with water in a percentage
varying from 30% to 50% as instructed in the rel-
evant rdi messa in servizio e manutenzione.
b Only fill the solar heating system with water and
glycol premixed in the percentages specified in the
r installation and maintenance manual.
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 anoth-
er owner or transferred to another user or to another
installation. If you damage or lose this manual, order
a replacement immediately from your local r
Technical Assistance Centre.
GENERAL SAFETY INFORMATION
a Do not expose the combination storage cylinder to
the elements. It is not designed for use outdoors.
a Do not leave packaging material within the reach of
children, since it can become a potential hazard.
a If the pressure in the solar heating circuit drops, do
not top up with water alone, since this increases the
risk of damage from freezing.
a Do not use connections or safety devices or fittings
(expansion vessels, pipes, insulation) that are not
specifically designed and tested for use in solar
heating installations.

GENERAL
6
PRODUCT DESCRIPTION
rKOMBI combination storage cylinders consist of a
domestic hot water tank immersed in an inertial storage
cylinder. They are specifically designed for domestic hot
water production and heat integration in heating systems
incorporating r CS25 solar collectors:
The most important technical features of these combina-
tion storage cylinders are:
- The cylinder and coil are specially designed and
shaped for optimum performance in terms of stratifica-
tion, heat exchange and replenishment times
- The vitrified lining of the domestic hot water tank is bac-
teriologically inert for maximum hygiene, reduced lime
scale deposits and easy cleaning
- Water fittings are available at different heights, permit-
ting different hot water generators to be used without
reducing the stratification effect
- CFC-free polyurethane insulation and an elegant exter-
nal casing reduce heat loss and improve efficiency
- A flange is provided for easy cleaning and maintenance
and a magnesium anode is provided to prevent corro-
sion
- Excellent flexibility permits use in both high and low
temperature systems
- Dimensions are extremely compact thanks to the clever
combination of an inertial storage cylinder and domes-
tic hot water tank.
rKOMBI combination storage cylinders can be con-
nected to a special solar controller and can be integrated
in solar heating systems in which rboilers or water
heaters serve as auxiliary heat generators.
rKOMBI combination storage cylinders are identified by three plates:
IDENTIFICATION
b If these plates or any other means of clearly identify-
ing the product are defaced, removed or lost, proper
installation and servicing may be rendered difficult.
– 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.
bar
kWh/24h
l
W
bar
°C
kW
l
°C
kW
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
T06773001IF
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
ACCUMULO COMBINATO - PRÉPARATEUR SOLAIRE MIXTE
M
Modèle
odello M
N° fabrication
atricola
C
Code
odice A
Année de fabrication
nno fabbricazione
Capacità serpentino sanitario
Capacité du serpentin sanitaire
Potenza assorbita serpentino sup. [T° Primario 80°C]
Puissance absorbée serpentin sup. [T Primaire 80°C]
Capacità accumulo inerziale
Capacité du préparateur inertiel
Press. max. esercizio sanitario
Press. maxi service sanitaire
Temp. max. esercizio sanitario
Temp. maxi service sanitaire
Pot. elett. assorbita
Puiss. électr. absorbée
Press. max. esercizio accumulo inerziale
Press. maxi service préparateur inertiel
Temp. max. esercizio accumulo inerziale
Temp. maxi service préparateur inertiel
Dispersioni secondo EN 12897
Déperditions selon EN 12897
V-Hz
Aliment. elettrica
Alimentation électrique
Collegamento di terra obbligatorio -Raccordement à la terre obligatoire
Matricola
N° fabrication
Modello
Modèle
Prod.ACS prel. cont
Prod.ECS prél. continu
Pot. ass. serp. sup.
Puis. abs. serp. sup.
l/h
l/h
Produzione ACS prelievo continuo
Production ECS prélèvement continu
[ ΔT 35°C]
[ ΔT 35°C]
bar
kWh/24h
l
W
bar
°C
kW
l
°C
kW
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
T06773001IF
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
ACCUMULO COMBINATO - PRÉPARATEUR SOLAIRE MIXTE
M
Modèle
odello M
N° fabrication
atricola
C
Code
odice A
Année de fabrication
nno fabbricazione
Capacità serpentino sanitario
Capacité du serpentin sanitaire
Potenza assorbita serpentino sup. [T° Primario 80°C]
Puissance absorbée serpentin sup. [T Primaire 80°C]
Capacità accumulo inerziale
Capacité du préparateur inertiel
Press. max. esercizio sanitario
Press. maxi service sanitaire
Temp. max. esercizio sanitario
Temp. maxi service sanitaire
Pot. elett. assorbita
Puiss. électr. absorbée
Press. max. esercizio accumulo inerziale
Press. maxi service préparateur inertiel
Temp. max. esercizio accumulo inerziale
Temp. maxi service préparateur inertiel
Dispersioni secondo EN 12897
Déperditions selon EN 12897
V-Hz
Aliment. elettrica
Alimentation électrique
Collegamento di terra obbligatorio -Raccordement à la terre obligatoire
Matricola
N° fabrication
Modello
Modèle
Prod.ACS prel. cont
Prod.ECS prél. continu
Pot. ass. serp. sup.
Puis. abs. serp. sup.
l/h
l/h
Produzione ACS prelievo continuo
Production ECS prélèvement continu
[ ΔT 35°C]
[ ΔT 35°C]

GENERAL
7
DESIGN
1
2
3
4
6*
7
9*
10
12
11
14
10
17
14
18
28
11
13
19
20
21
22
24
26
27
18
15 16
15 161410 17
13
5
8
23
25
1 - Insulation
2 - Inertial storage cylinder
3 - Solar coil
4 - Return to boiler 1-2
5 - Sleeve for electric heating element
(not supplied)
6* - Outlet from boiler 2 (low temperature)
7 - Domestic hot water tank
8 - Temperature gauge
9* - Outlet from boiler 1 (high temperature)
10 - Magnesium anode
11 - Flange
12 - Cylinder cover
13 - Flange cover
14 - Domestic hot water recirculation
15 - Domestic hot water outlet
16 - Domestic cold water in
17 - Domestic hot water probe well
18 - Vent valve fitting
19 - Heating flow 1 (high temperature)
20 - Boiler probe well
21 - Heating return 1 (high temperature)
22 - Auxiliary probe well
23 - Solar collector outlet
24 - Heating flow 2 (low temperature)
25 - Solar collector return
26 - Solar controller probe well
27 - Heating return 2 (low temperature)
Inertial storage cylinder drain
28 - Flange insulation
(*) with internal deflector

GENERAL
8
TECHNICAL SPECIFICATIONS
(*) With ∆T = 35°C and primary temperature = 80-60°C.
Performance achieved with heat generator of suitable power, adjusted for a flow rate of 4 m3/h for model 800 and 5 m3/h
for model 1000.
DESCRIPTION MODEL
KOMBI 800 KOMBI 1000
Type of domestic hot water tank vitrified
Type of inertial storage cylinder non vitrified
Domestic hot water tank layout vertical
Heat exchanger layout vertical
Inertial storage cylinder capacity 560 695 l
Domestic hot water tank capacity 240 285 l
Diameter with insulation 1000 mm
Diameter without insulation 790 mm
Height 1870 2196 mm
Insulation thickness 100 mm
Magnesium anode 32x460 Øxmm
Flange diameter (external/internal) 280/205 mm
Probe well diameter 1/2" Ø
Coil water capacity 16 19 l
Coil heat exchange surface area 2,80 3,16 m2
Power absorbed by coil (*) 76 92 kW
Continuous production of domestic hot water (*) 800 1000 l/h
Water draw in 10 minutes with mean ∆T of 35°
and main buffer tank at:
80°C 515 550 l
70°C 500 515 l
60°C 415 450 l
Maximum working pressure of domestic hot water tank 6 bar
Maximum working temperature of domestic hot water tank 99 °C
Maximum working pressure of inertial storage cylinder 3 bar
Maximum working temperature of inertial storage cylinder 99 °C
Maximum working pressure of coil 6 bar
Maximum working temperature of coil 99 °C
Net weight 210 265 kg
Gross weight (with packaging) 225 281 kg
Heat loss according to EN 12897:2006 at ∆T=45 °C 123 143 W
Energy efficiency class C
Useful non-solar volume (Vbu) 220 255 l

GENERAL
9
COIL pressure drop
PRESSURE DROP (mbar)
FLOW RATE (l/h)
600
700
800
900
1000
1100
500
400
300
200
100
0
0 1000 2000 3000 4000 5000 6000
Mod. 1000 Mod. 800

GENERAL
10
WATER CIRCUIT
MC1
MC2 RI1
MI1
RI2
MI2
RC1-2
RL
UAC EAF
SB
M
RE
R
b rKOMBI 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.
EAF - Domestic cold water inlet
RL - DHW recirculation
UAC - Domestic hot water outlet
MC1 - Outlet from boiler 1
(high temperature)
MC2 - Outlet from boiler 2
(low temperature)
RC1-2 - Return to boiler 1-2
RI2/SB - Heating return 2
(low temperature) /
Inertial storage cylinder drain
MI2 - Heating flow 2
(low temperature)
R - Collector return
M - Collector outlet
RE - Sleeve for electric
heating element
RI1 - Heating return 1
(high temperature)
MI1 - Heating flow 1
(high temperature)

INSTALLATION
11
UNPACKING THE PRODUCT
Ø
H
DIMENSIONS AND WEIGHT
DESCRIPTION MODEL
KOMBI 800 KOMBI 1000
H - Height 1870 2196 mm
Ø - Diameter 990 990 mm
Net weight 210 265 Kg
Gross weight (with packaging) 225 281 Kg
rKOMBI combination cylinders are supplied in a single package on a wooden pallet.
The insulation and the lining components of the models 800 and 1000 are supplied separately from the structural work
and are to be assembled upon receiving the product as described in the paragraph "Assembly of the insulation and the
lining".
The following items are delivered in a plastic bag inside the packaging:
- Instruction manual
- Certificate of warranty and label with bar code
- Hydraulic test certificate
- 4 adjustable feets
b The instruction manual is an integral part of the solar storage cylinder. Once located, read it thoroughly and
keep it safe.
b For handling operations, thoroughly follow the instructions on device package label.

INSTALLATION
12
HANDLING
Once you have removed the outer packaging, proceed
as follows to unpack and handle the combination storage
cylinder.
b Wear suitable personal protective equipment and
use suitable safety devices.
a Do not leave packaging material within the reach of
children, since it can become a potential hazard.
17
Make sure that any lifting equipment is of adequate capa-
city to lift and move the storage cylinder.
Proceed as follows to remove the storage cylinder from
the pallet.
- 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.
- Remove the brackets then carefully rotate and slide the
storage cylinder off the pallet on to the platform.
- Make sure that the storage cylinder is perfectly stable,
and then remove the pallet.
- Carefully rotate and slide the storage cylinder 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.

INSTALLATION
13
ASSEMBLY OF THE INSULATION AND THE LINING
4
1
5
6
8
9
7
1
2
1
2
2
3
3
1
2
1
5
The assembly of the insulation and lining components
must be performed at the site of installation to facilitate
passage through any doors and/or entries to the room.
Proceed as follows:
- Assemble the insulating covers (1) around the body of
the heater, making sure that the engagement points on
the edges are positioned correctly. The edges are not
required to be closed completely
- Place the front protection plate (2) correctly on the
attachments
- Place the rear protection plate by closing the interlo-
cking flaps (3) without closing completely (leave one
tooth open)
- Put the washers on the attachments (4)
- Cut the top insulation (5) and apply it
- Apply the insulation (6)
- Close the interlocking flaps (3) completely, which were
previously left with an open tooth
- Apply the upper insulation (7) and the upper cover (8)
(in order to insert the cover, exert a light and homoge-
neous pressure)
- Secure the top half-discs (9) with the screws supplied
- Apply the technical data plate and serial number plate
If disassembling is required, proceed in reverse order.
b Wear suitable personal protective equipment
and use suitable safety devices.
a Do 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.

INSTALLATION
14
rKOMBI combination storage cylinders can be installed in any room where there is no specific requirement for an
electrical protection rating higher than IP X0D.
b The room where the appliance is installed must, however, be dry to prevent the formation of rust.
b Specified minimum distances must be respected, and the space in which the combination storage cylinder is to
be installed must be easily accessible in order to permit easy installation and assembly and subsequent inspec-
tion, maintenance and repair. In particular, access must permit the combination storage cylinder to be removed
without disassembly at the end of its useful life, and another unit to be installed in its place. Users are therefore
responsible for any costs incurred to demolish masonry or other structures preventing or impeding free access to
the space where the combination storage cylinder is to be installed.
When installing rKOMBI combination storage cylin-
ders in old systems or systems requiring modernisation,
always perform the following checks:
- Make sure that the system is fitted with safety and con-
trol devices in accordance with applicable legislation
and standards.
- Make sure that the circuit has been flushed out to remo-
ve 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).
PLACE OF INSTALLATION
INSTALLATION IN OLDER SYSTEMS AND SYSTEMS REQUIRING MODERNISATION
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

INSTALLATION
15
WATER CONNECTIONS
A460
520
580
444 183
442502
75
E
F
G
H
B
C
D
MC1 MI1
MI2
RI1
RI2-SB
MC2
RC1-2
M-R
VS
RL
UAC
EAF
rKOMBI combination storage cylinders can be connected to even previously installed hot water generators pro-
vided they are of adequate output power, but care must be taken to ensure correct water flow directions. They can also
be easily integrated in rsolar heating systems based on CS 25 R solar collectors with their corresponding fixing
system, water control group, expansion vessel and thermostatic mixer valve.
Water fittings have the following specifications:
We recommend that you install isolating valves in the outlet and return lines.
MC1 - Outlet from boiler 1 (Ø 1”1/4 F)
MC2 - Outlet from boiler 2 (Ø 1”1/4 F)
RC1-2 - Return to boiler 1-2 (Ø 1”1/4 F)
RI2/SB - Heating return 2 (Ø 1”1/4 M)/
(Inertial storage cylinder drain)
MI2 - Heating flow 2 (Ø 11”1/4 F)
M - Collector outlet (Ø 1” M)
R - Collector return (Ø 1” M)
RI1 - Heating return 1 (Ø 1”1/4 F)
MI1 - Heating flow 1 (Ø 1”1/4 F)
EAF - Domestic cold water in (Ø 1” M)
UAC - Domestic hot water out (Ø 1” M)
RL - DHW recirculation (Ø 3/4” M)
VS - Vent valve fitting (Ø 3/8” F)
DESCRIPTION MODEL
KOMBI 800 KOMBI 1000
A 800 960 mm
B 1100 1260 mm
C 1460 1785 mm
D 1870 2196 mm
E 800 960 mm
F 830 925 mm
G 1100 1260 mm
H 1460 1785 mm

INSTALLATION
16
b The domestic hot water tank 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 domestic
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 meth-
od 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.
b The lower the temperature of the heating return
(<40°C), the greater the efficiency of the solar heat-
ing 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 tempera-
tures 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 domestic hot water tank has been heated with-
out being too big. Water temperature in the inertial
storage cylinder should be about 10°C higher than
the return from the low temperature heating sys-
tem.
b Insulate the pipes from the inertial storage cylinder
to avoid heat loss.

TECHNICAL ASSISTANCE
17
LOCATION OF PROBES
Well for
DOMESTIC HOT
WATER PROBE
Well for
BOILER PROBE
Well for
AUXILIARY
PROBE
Well for
SOLAR
CONTROLLER
PROBE
rKOMBI combination storage cylinders incorpo-
rate probe wells for fitting the solar controller and boiler
probes. Make sure that these probes are inserted all the
way.
b To access the well for the domestic hot water
probe, you must remove the two flange covers.
(Drill a hole for the cable if necessary).
b Installers are responsible for all connections to
the boiler or hot water generator. Installers must
ensure proper installation and functioning in
compliance with all applicable legislation.
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 domestic 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.
b The domestic hot water tank must be filled and
pressurised before the inertial storage cylinder
is filled.
PREPARING FOR INITIAL START-UP

TECHNICAL ASSISTANCE
18
INITIAL START-UP
Heat is only transferred from the solar heating circuit to
the combination storage cylinder when the temperature
of the solar collectors exceeds that in the combination
storage cylinder. It is therefore temperature differential
rather than absolute temperature that is important in con-
trolling solar water heating systems.
- Set the required temperature differential between the
collector and combination storage cylinder (see the
instruction manual for the controller).
- Start up the boiler to provide auxiliary heating for the
combination storage cylinder.
1
2
3
4
5
06
Once the system has been started up, perform the fol-
lowing 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
- Check that the cold pressure of the system is approxi-
mately 3 bar
- Check that the safety valve operates at 6 bar
- Check that all pipes in the water circuit have been insu-
lated in conformity to relevant standards.
CHECKS DURING AND AFTER INITIAL START-UP

TECHNICAL ASSISTANCE
19
PREPARING FOR EXTENDED PERIODS OF DISUSE
Heating circuit
- Check that the heating circuit has been properly bled
Provided all the above checks have been completed
successfully, re-start the boiler and the storage cylinder
and check the temperature settings and domestic hot
water draw rate.
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 heat-
ing) circuit if there is any risk of freezing.
Contact your local rTechnical Assistance Centre if
you encounter any problems in completing the above
procedure.

TECHNICAL ASSISTANCE
20
MAINTENANCE
Scheduled maintenance is essential for the safety, efficiency and long working life of your combination storage cylinder.
Proper maintenance also reduces energy consumption and ensures reliability over time. Have your combination storage
cylinder serviced either by a rTechnical Assistance Centre or by a qualified professional at least once a year.
Perform the following operations before beginning any
maintenance:
- Switch the electricity supply to the storage cylinder’s
valve group and to any associated boiler OFF at the
main switch and at the control panel
- Close the shut-off cocks for the domestic hot water cir-
cuit
- Drain the storage cylinder’s secondary water circuit.
1
2
3
4
5
6
7
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 denatured alcohol or a suitable cleaning product. Dry
the combination storage cylinder after cleaning it.
a Do not use abrasive products, petrol or triethylene.
INTERNAL CLEANING
- Unscrew the fixing screws, then remove the flange insu-
lation (3), top cover (1) and the flange covers (2).
- Use a wrench to unscrew the bolts (4) fixing the flange
(5) in place, and remove the flange taking care not to
damage the seal (6) and magnesium anode (7).
- Clean inside the domestic hot water tank and remove
any residues through the access hole.
- Check the magnesium anode (7) for wear and replace
it if necessary.
Once the cleaning operations have been completed refit
all components, following the above steps in the reverse
order.
b Tighten the bolts (4) fixing the flange (5), procee-
ding diagonally around the flange to apply pressure
uniformly around the seal.
- Fill the combination storage cylinder’s secondary circuit
and check that there are no leaks from the seals.
- Check the performance of the storage cylinder.
CLEANING AND REMOVING INTERNAL COMPONENTS