thermital THE/COMBI3 430 Manual

THE/COMBI3
INSTALLATION
AND MAINTENANCE MANUAL

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RANGE
MODEL CODE
THE/COMBI3 430 20023611
THE/COMBI3 550 20023612
THE/COMBI3 750 20023613
THE/COMBI3 1000 20023614

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Dear Installer,
Thank you for choosing a THERMITAL THE/COMBI3 combination storage cylinder, a modern, 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 THERMITAL THE/COMBI3 com-
bination storage cylinder.
Please accept our renewed thanks for your purchase.
Thermital
Ask your Technical Assistance Centre for further information on how to get the best from your new combination storage
cylinder.

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CONTENTS
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 20024133 - Rev. 8(05/17) is made up
of 28 pages.
GENERAL 5
Safety precautions .......................................................5
General safety information...........................................5
Product description......................................................6
Identification.................................................................6
Design..........................................................................7
Technical specifications...............................................8
Accessories ...............................................................12
Water circuit ...............................................................13
INSTALLATION 14
Unpacking the product..............................................14
Dimensions ................................................................14
Handling.....................................................................15
Place of installation....................................................17
Installation in older systems and systems requiring
modernisation ............................................................17
Water connections .....................................................18
Location of probes.....................................................21
Preparing for initial start-up .......................................21
TECHNICAL ASSISTANCE 21
Initial start-up .............................................................22
Checks during and after initial start-up .....................22
Preparing for extended periods of disuse.................23
Maintenance ..............................................................24
Cleaning.....................................................................24
Troubleshooting..........................................................25

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GENERAL
SAFETY PRECAUTIONS
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.
The operation of any appliance that uses electrical power and water demands that a number of fundamental safety
precautions be respected. In particular:
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.
b As soon as you open the packaging, check imme-
diately that the contents are all present and undam-
aged. Contact the THERMITAL reseller from whom
you purchased the product if you notice any prob-
lems.
b This THERMITAL THE/COMBI3 combination stor-
age cylinder must be installed by a qualified install-
er. On completion of the installation, the installer
must issue the owner with a declaration of conform-
ity confirming that the installation has been com-
pleted to the highest standards in compliance with
the instructions provided by THERMITAL in this
instruction manual, and that it conforms to all appli-
cable laws and standards.
b This THERMITAL THE/COMBI3 combination stor-
age heater must only be used for the purpose spec-
ified by THERMITAL and for which it is designed.
The manufacturer declines all responsibility, con-
tractual 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
THERMITAL Technical Assistance Centre or a qual-
ified technician immediately.
b This combination storage cylinder must be serviced
at least once a year.
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%.
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 THERMITAL Technical Assistance Centre.
GENERAL SAFETY INFORMATION

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GENERAL
PRODUCT DESCRIPTION
THE/COMBI3 triple coil combination storage cylinders
come in the form of an inertial (buffer) 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 domes-
tic hot water.
The most important technical features of these combina-
tion storage cylinders are:
- The cylinder and coils are specially designed and
shaped for optimum performance in terms of stratifica-
tion, heat exchange and replenishment times.
- The stainless steel, rapid heat exchange coil for domes-
tic hot water production is bacteriologically inert and
guarantees maximum hygiene and reduced lime scale
deposits.
- Water fittings are available at different heights, permit-
ting different boilers to be used without reducing the
stratification effect.
- CFC-free polyurethane insulation and an elegant exter-
nal 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 storage cylinder and domes-
tic hot water coil.
THE/COMBI3 triple coil combination storage cylinders
can be connected to a special solar controller and can be
integrated in solar heating systems in which THERMITAL
boilers or water heaters serve as auxiliary heat genera-
tors.
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.
RIELLO S.p.A. Via Ing. Pilade Riello, 7 - 37045 Legnago (VR)
RIELLO S.p.A. Via Ing. Pilade Riello, 7 - 37045 Legnago (VR)
RIELLO S.p.A. Via Ing. Pilade Riello, 7 - 37045 Legnago (VR)
RIELLO S.p.A. Via Ing. Pilade Riello, 7 - 37045 Legnago (VR)
THERMITAL THE/COMBI3 combination storage cylinders are identified by three plates:
IDENTIFICATION

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GENERAL
DESIGN
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 sensor
socket
22 - Return to condensing boiler / Filling
23 - 30° C water return / Drain

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GENERAL
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 3000 l/h.
DESCRIPTION THE/COMBI3
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 95 °C
Maximum working pressure of primary coils 10 bar
Maximum working pressure of DHW coil 6 bar
Maximum working temperature of primary coils 95 °C
Maximum working temperature of DHW coil 90 °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

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GENERAL
CONFIGURATION A
THE/COMBI3 Boiler
CONFIGURATION B
THE/COMBI3 Boiler
Descrizione THE/COMBI3
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 THE/COMBI3
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 THE/COMBI3 combination storage cylinder with boiler connected in:

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GENERAL
CONFIGURATION C
THE/COMBI3 Boiler
CONFIGURATION D
THE/COMBI3 Boiler
Descrizione THE/COMBI3
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 THE/COMBI3
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 THE/COMBI3 combination storage cylinder with boiler connected in:

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GENERAL
Pressure drop
THE/COMBI3 TOP COIL
Pressure drop
THE/COMBI3 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

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GENERAL
Pressure drop
THE/COMBI3 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
ACCESSORIES
The following accessories are available, to be ordered separately.
ACCESSORY CODE
SOL 523000169
SOL PRO 523000170
SOL PLUS 523000171
MR 6,5 water outlet and return kit 523000176
MR 12DC water outlet and return kit 20012765
1 curved union kit for storage cylinder connection 4383171
Single phase heating element kit, 1,5 kW 1" 1/2 4383270
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 4383273
Thermostatic mixer valve 4383076
18 L. solar expansion vessel 4383052
24 L. solar expansion vessel 4383053
35 L. solar expansion vessel 4383054

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GENERAL
WATER CIRCUIT
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.
See page 19.
b THERMITAL THE/COMBI3 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 element
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

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INSTALLATION
UNPACKING THE PRODUCT
THERMITAL THE/COMBI3 combination storage cylin-
ders are delivered in a single package consisting of a
triple wall cardboard box (THE/COMBI3 430-550) or a
plastic bag (THE/COMBI3 750-1000) on a wooden pallet.
The following items are delivered in a plastic bag inside
the packaging:
The following items are delivered in a plastic bag inside
the packaging:
- instruction manual
- label with bar code
- spare parts catalogue
- 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.
Ø
H
DESCRIPTION THE/COMBI3
430 550 750 1000
H - Height 1650 2000 1855 2180 mm
Ø - Diameter 810 810 1000 1000 mm
Net weight 168 195 239 269 Kg
DESCRIPTION THE/COMBI3
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
DIMENSIONS
A
B
H
A
B
H
THE/COMBI3
430-550
THE/COMBI3
750-1000

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INSTALLATION
HANDLING
1
1
1
1
17
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)
- 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 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.

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INSTALLATION
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 devices.
aDo not dispose of packaging material into the envi-
ronment, 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

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INSTALLATION
THERMITAL THE/COMBI3 combination storage cylin-
ders can be installed in any room where there is no spe-
cific requirement for an electrical protection rating higher
than IP X0D.
b Respect the minimum specified installation dis-
tances to ensure correct installation and access for
maintenance.
When installing THERMITAL THE/COMBI3 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 con-
trol devices in accordance with applicable 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).
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
PLACE OF INSTALLATION
INSTALLATION IN OLDER SYSTEMS AND SYSTEMS REQUIRING MODERNISATION
≥ 0,4 m
≥ 0,6 m
≥ 0,3 m ≥ 0,4 m

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INSTALLATION
WATER CONNECTIONS
O
C
D
SB
RCON
MCON
R50
RC2
UR
MC2
MC
A
B
EAF
UAC
VS
E
F
G
H
I
L
N
MR
THERMITAL THE/COMBI3 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 directions.
They can also be easily integrated in THERMITAL solar heating systems.
Water fittings have the following specifications:
We recommend that you install isolating valves in the outlet and return lines.
DESCRIPTION THE/COMBI3
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 405 405 495 495 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)

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INSTALLATION
°C
NO NC
C
(X10-06)
LMU
VBus
910
(X10-02)
(X2-02)
(X10-01) (X52-03) (X52-02) (X52-01)
1
2
3
4
5
6
7
8
9
10
10
11
12
13
14
15
16
17
18
19
20
20
21
22
9
Typical water system schematic
1 Manual bleed valve 2 Solar collector 3 THC V 4 THE/COMBI3 5 Fireplace 6 Water treatment unit 7 Electronic pump 8 Water outlet and return kit
MR and expansion vessel
9 Room thermostat 10 Distribution manifold 11 Two way valve 12 Thermostatic mixer valve 13 DHW expansion vessel 14 CH expansion vessel 15 Thermostatic valves 16 SOL PRO 17 Mixed zone electric kit 18 Temperature control valve
(60°C-40°C in boiler)
19 Relay 20 Pump 21 Outdoor temperature sen-
sor
22 Solar heating circuit ex-
pansion vessel

20
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INSTALLATION
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
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 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 without
being too big.
b Insulate the pipes from the inertial storage cylinder
to avoid heat loss.