RIELLO RBS 2S Boiler for Solar Heating System User Manual
- October 30, 2023
- RIELLO
Table of Contents
RBS 2S
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
cod. 20116337 rev. 1005/2023
GENERAL INFORMATION
RANGE
MODEL | CODE |
---|---|
RBS 200 2S | 20116675 |
RBS 300 2S | 20116335 |
RBS 430 2S | 20117339 |
RBS 550 2S | 20116587 |
RBS 800 2S | 20132268 |
RBS 1000 2S | 20132269 |
ACCESSORIES
For a complete list of accessories and details of their compatibility, refer
to the Catalogue.
Dear heating engineer,
We would like to congratulate you on having recommended a RIELLO solar
storage cylinder unit: a modern product that’s ca- pable of ensuring a high
degree of reliability, efficiency, quality and safety.
While your technical skills and knowledge will certainly be more than
sufficient, this booklet contains all the information that we have deemed
necessary for the device’s correct and easy in- stellation.
Thank you again, and keep up the good work,
Riello S.p.A.
CONFORMITY
The R solar heaters comply with DIN 4753-3 and UNI EN 12897.
** At the end of its life, the product should be not be disposed of as
solid urban waste, but rather it should be handed over to a differentiated
waste collection center.
The following symbols are used in this manual:
CAUTION! = Identifies actions that require caution and adequate
preparation.
STOP!** = Identifies actions that you MUST NOT do.
**GENERAL SAFETY INFORMATION
**
** Check that the product is complete, undamaged and as ordered as soon as
you receive it. Report any discrepancies or damage to the RIELLO dealer
who sold it.
** This product must be installed by a legally qualified heating engineer.
On completion of the installation, the installer must issue the owner with a
declaration of conformity confirming that the installation has been completed
to the highest standards in compliance with the instructions provided by
RIELLO in this instruction manual, and that it conforms to all applicable
laws and standards.
** This product must only be used for the purpose for which it is designed
and made, as specified by RIELLO.RIELLO declines all responsibility,
contractual or other, for damage to property or injury to persons or animals
caused by improper installation, adjustment, maintenance or use.
**The product must be serviced at least once a year. Servicing must be
arranged in advance with the RIELLO Technical Assistance Service.
All servicing and repairs must be performed by a qualified heating
engineer.
If water leaks from the storage cylinder, turn off the water supply and
contact RIELLO ’s Technical Assistance Service or a qualified heating
engineer immediately.
If the product is not going to be used for an extended period of time,
contact the manufacturer’s Technical Assistance Service to have at least the
following operations performed:
− Close the shut-off cocks for the domestic hot water circuit
− Shut down the boiler connected to the storage cylinder as instructed in its
own manual
− Switch the storage cylinder OFF at the control panel (if fitted) and at the
mains power switch
− Drain the central heating circuit and domestic hot water circuit if there is
any risk of freezing.
This instruction manual is an integral part of the product. It must be
kept safe and must ALWAYS accompany the product, even if it is sold to another
owner or transferred to another user or to another installation. If you lose
this manual, order a replacement immediately. Keep the product purchase
documents to be presented to the RIELLO authorized Technical Assistance
Service to request a service call under warranty.
**** Size the solar expansion tank so as to ensure complete absorption of the
expansion of the fluid contained within the system, with reference to the
prevailing regulations on the matter. In particular, consider fluid
characteristics, consider fluctuation of service temperature and vapor that
might be generated during solar collector stagnation stage. Proper size of
expansion tank ensures setting off of all volume changes of the heat transfer
fluid, avoiding excessive pressure increase. Limited pressure changes avoid
reaching safety valve opening pressure and the consequent fluid drainage.
This manual, Code 20116337 – Rev. 10 (05/2023) comprises 12 pages.
**PRECAUTIONS
**
The operation of any appliance that uses electrical power demands that a
number of fundamental safety precautions be respected. In particular:
Never attempt to install the system without using suitable personal protection
equipment and without following all applicable occupational safety standards.
0 Do not touch the product when barefoot or wet if it has any electrical
accessories installed in it.
Never clean or service the storage cylinder without first turning the mains
power switch OFF to disconnect all electrical accessories (if fitted) from the
mains electricity supply.
Never pull, disconnect, or twist any electrical cables coming from the
appliance even if it is disconnected from the mains electricity supply.
Do not expose the storage cylinder to the elements. It is not designed for use
outdoors.
If solar plant pressure decreases, it is forbidden to top up with only water
as there is a danger of freezing and overheating.
Do not use connections or safety devices or fittings (expansion vessels,
pipes, insulation) that are not specifically designed and tested for use in
solar water heating systems.
Do not allow children or infirm persons to operate the system unsupervised.
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.
DESCRIPTION OF THE APPLIANCEL
RIELLO RBS 2S double-coil solar heaters, available in six different
models, can be integrated in solar systems for the production of domestic hot
water.
RIELLO RBS 2S solar heaters can be equipped with a solar regulator and
can be easily used in solar systems where RIELLO boilers or heating groups
serve as an integration.
The most important technical features of these solar storage infers are:
− the accurate study of tank and coil geometry
− internal glazing, bacteriologically inert, to ensure the maximum hygiene of
treated water, reduce limescale deposits and make cleaning operations easier
− insulation made of expanded polyurethane free from CFC (chlorofluorocarbons)
− a flange is provided for easy cleaning and maintenance of the anti-corrosion
magnesium anode.
**IDENTIFICATION
**
The RIELLO RBS 2S solar heaters can be identified by:
Data plate
This lists the technical specifications and performance of the
product. Serial number plate
This specifies the serial number and model.
Technical data plate and Serial number plate are to be applied (by the
installer) after installation is complete.
If these plates or any other means of clearly identifying the product
are defaced, removed or lost, proper installation and servicing may be
rendered difficult.
SYSTEM LAYOUT
1 | Storage cylinder |
---|---|
2 | Top coil |
3 | Bottom coil |
4 | Flange for heater inspection |
5 | Insulation |
6 | Cover |
P | Socket |
M | Guide |
UAC | Domestic hot water outlet |
EAF | Domestic cold water inlet |
SB | Storage cylinder drain |
TECHNICAL SPECIFICATIONS
DESCRIPTION| RBS 2S|
---|---|---
200 | 300| 430| 550| 800| 1000
Type of storage cylinder| Vertical, glazed|
Heat exchanger layout| Vertical, with elliptical section|
Storage cylinder capacity| 208| 301| 430| 551| 731| 883| l
Useful non-solar volume (Vbu)*| 68| 117| 182| 175| 251| 312| l
Solar usable volume (Vsol)**| 140| 184| 260| 376| 480| 570| l
Diameter of storage cylinder with insulation| 604| 604| 755| 755| 1000| 1000|
mm
Diameter of storage cylinder without insulation| –| –| –| –| 790| 790| mm
Height with insulation| 1338| 1838| 1644| 1988| 1846| 2171| mm
Height without insulation| –| –| –| –| 1745| 2070| mm
Insulation thickness| 50| 50| 50| 50| 100| 100| mm
Total net weight| 80| 104| 135| 159| 218| 240| kg
Quantity/diameter/length of magnesium anode| 1/33/450| 1/33/450| 1/33/520|
1/33/520| 1/40/600| 1/40/600| mm
Flange internal diameter| 130| 130| 130| 130| 130| 130| mm
Diameter/length of sensor sockets| 16/180| 16/180| 16/180| 16/180| 16/180|
16/180| mm
Top coil water capacity| 3,5| 4,0| 5,0| 5,0| 8,0| 8,0| l
Top coil heat exchange surface area| 0,7| 0,8| 1,0| 1,0| 1,6| 1,6| m2
Bottom coil water capacity| 3,5| 5,0| 7,0| 9,0| 11,5| 13,5| l
Bottom coil heat exchange surface area| 0,7| 1,0| 1,4| 1,8| 2,3| 2,7| m2
Maximum operating pressure of storage cylinder| 10| 7| bar
Maximum operating pressure of coils| 10| 7| bar
Maximum operating temperature| 99| °C
Discharges according to EN 12897:2006 DT=45 °C (am-
bient 20°C and storage at 65°C)
| 62| 69| 75| 85| 94| 101| W
Discharges according to UNI 11300| 1,38| 1,53| 1,67| 1,89| 2,09| 2,24| W/K
Energy class| B| B| B| B| B| B|
PERFORMANCE RELATING TO INTEGRATION COIL
Upper coil continuous efficiency (ACS 10-45°C)
(Vbu reference volume)
Upper coil delivery temperature|
80°C
T 20°C| 16,1| 23| 31,4| 31,4| 50| 50| kW
400| 572| 774| 774| 1240| 1240| l/h
70°C
T 20°C| 10,3| 17| 20,7| 20,7| 38| 38| kW
247| 425| 505| 505| 930| 930| l/h
60°C
T 20°C| 6,5| 11| 15,5| 15,5| 25| 25| kW
160| 277| 375| 375| 620| 620| l/h
50°C
T 20°C| 2,4| 5| 7| 7| 15| 15| kW
57| 130| 170| 170| 380| 380| l/h
Set-up time required to heat the heater to
60°C, referred to the integration coil probe,
to the different upper coil inlet teem-
prelatures with a coil outlet/inlet delta ( D
) of 20°C (Vbu reference volume)
Upper coil delivery temperature|
80°C
T 20°C| 25| 27| 24| 24| 26| 28| min
70°C
T 20°C| 33| 34| 32| 32| 34| 40| min
60°C
T 20°C| 66| 65| 65| 65| 65| 67| min
NL thermal efficiency coefficient according to
DIN 4708. The NL index, referred to the
integration exchanger, indicates a number of
apartments having 3.5 people that can be fully
supplied, with a 140 l bathtub and two other drawing points.
Upper coil delivery temperature|
80°C| 1,12| 1,64| 2,2| 2,23| 3,63| 3,79|
70°C| 0,86| 1,34| 1,66| 1,69| 2,88| 3,19|
60°C| 0,65| 1,04| 1,37| 1,42| 2,17| 2,47|
PERFORMANCE RELATING TO SOLAR COIL
Bottom coil continuous efficiency (ACS 10-45°C)
(Vbu reference volume)
Bottom coil delivery temperature|
80°C
T 20°C| 17,1| 29,6| 44,2| 53,6| 71,9| 82,9| kW
419,6| 727,1| 1087,2| 1316,3| 1766,1| 2037,0| l/h
70°C
T 20°C| 10,9| 21,9| 28,9| 35,3| 54,6| 63,0| kW
268,4| 537,4| 709,0| 867,7| 1342,2| 1548,1| l/h
60°C
T 20°C| 6,9| 14,2| 21,6| 26,4| 35,9| 41,5| kW
169,4| 347,7| 530,9| 649,7| 883,0| 1018,5| l/h
50°C
T 20°C| 2,5| 6,4| 9,8| 11,9| 21,6| 24,9| kW
62,5| 158,1| 239,8| 293,4| 529,8| 611,1| l/h
Vbu (*) The non-solar usable volume indicates the quantity of water (in
litres) heated directly by the thermal integration coil. It is calculated as
the volume between the upper part of the heater and the lower part of the
thermal integration element (integration coil lower turn).
Vsol (**) The usable solar volume indicates the quantity of water (in litres)
heated directly by the solar coil (placed in the lower part of the heater)
minus the non-solar volume (Vbu).
EMPTYING IN 10’| RBS 2S|
---|---|---
200| 300| 430| 550| 800| 1000
PERFORMANCE RELATING TO INTEGRATION COIL
Quantity of domestic water obtained in 10’
with heater pre-heated to 60°C *() and primary
exchanger at the indicated deliv- ery temperature,
considering an increase of the domestic water
temperature of 30°C between inlet and outlet
(according to EN 12897).
Upper coil delivery temperature|
80°C| 166| 260| 330| 345| 595| 673| l
70°C| 138| 255| 323| 340| 513| 666| l
60°C| 131| 250| 308| 336| 473| 626| l
PERFORMANCE RELATING TO SOLAR COIL
Quantity of domestic water obtained in 10’
with heater pre-heated to the indicated
temperature () considering an increase of the
domestic water temperature of 30°C between inlet
and outlet (according to EN 12897).
Temperature of accumulation tank lower part|
70°C| 374| 438| 659| 863| 1190| 1530| l
60°C| 284| 375| 531| 675| 877| 1110| l
50°C| 205| 310| 390| 485| 762| 790| l
(*) Integration coil probe point reference, Vbu reference volume.
(**) Solar coil probe reference.
INSTALLATION
RIELLO RBS 2S solar heaters 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 (models 800 – 1000)”. For these models the magnesium
anode is supplied in a cardboard box.
The following items are delivered in a plastic bag inside the packaging:
- Instruction manual
- Bar code label
- Hydraulic test certificate
- Energy label (to be applied to device upon installation)
- No. 4 adjustable feet to be mounted during installation (for models 800 – 1000 only).
The instruction manual is an integral part of the solar storage
cylinder. Once located, read it thoroughly and keep it safe.
For handling operations, thoroughly follow the instructions on device
package label.
ASSEMBLY OF THE INSULATION AND THE LINING
(MODELS 800 – 1000)
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:
- Fit the magnesium anode (6) with its seal in the sleeve and fix it in place
- 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 (3) correctly on the attachments
- Place the washers on the attachments and the protection for the inspection flange (4)
- Place the rear protection plate by closing the interlocking flaps (L) without closing completely (leave one tooth open)
- Apply the upper insulation (2) and the upper cover (5) (in order to insert the cover, exert a light and homogeneous pressure)
- Close the interlocking flaps (L) completely, which were previously left with an open tooth
- Fit the cover of the inspection flange using the two self-tapping screws (7) provided
- Apply the technical data plate and serial number plate.
If disassembling is required, proceed in reverse order.
**** Wear suitable personal protective equipment and use suitable safety
devices.
PLACE OF INSTALLATION
RIELLO RBS 2S solar heaters can be installed in all rooms not requiring a level of electrical protection of the device greater than IP X0D.
NOTE: the above-indicated dimensions are recommended for a correct
maintenance and access to the device.
9.1 Installation in older systems and systems requiring modernization
When installing RIELLO RBS 2S storage cylinders in old systems or systems
requiring modernization, always perform the following checks.
- Make sure that the system is fitted with safety and control devices in accordance with applicable legislation and standards
- Make sure that the central heating 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).
WATER QUALITY REQUIREMENTS
REFERENCE VALUES
pH| 8-Jun
Electrical conductivity| less than 200 μS/cm (25°C)
Chlorine ions| less than 50 ppm
Sulphuric acid ions| less than 50 ppm
Total iron| less than 0.3 ppm
Alkalinity M| less than 50 ppm
Total hardness| less than 35°F
Sulphur ions| none
Ammonia ions| none
Silicon ions| less than 30 ppm
The values above ensure proper operation of the system. Refer to the limit values specified in the current standards and regulations on the installation site.
WATER CONNECTIONS
DESCRIPTION| RBS 2S|
---|---|---
200| 300| 430| 550| 800| 1000
UAC Domestic hot water outlet| 1” M| 1″1/4 M| Ø
MC Outlet from boiler| 1” M| 1” M| Ø
RC Return to boiler| 1” M| 1” M| Ø
M Outlet from solar collector| 1” M| 1” M| Ø
R Return to solar collector| 1” M| 1” M| Ø
RL DHW recirculation| 1” M| 1” M| Ø
EAF Domestic cold water inlet| 1” M| 1″1/4 M| Ø
Psc Diameter/length of boiler sensor socket| 16/180| 16/180| mm
Psr Diameter/length of solar controller sensor socket| 16/180| 16/180| mm
AD Quantity/diameter/length of magnesium anode| 1/33/450| 1/33/450| 1/33/520|
1/33/520| 1/40/600| 1/40/600| mm
DF Flange internal diameter| 130| 130| 130| 130| 130| 130| mm
A| 171| 171| 208| 207| 75| 75| mm
B| 243| 253| 329| 348| 289| 289| mm
C| 403| 393| 427| 443| 428| 421| mm
D| 598| 693| 684| 788| 799| 834| mm
E| 738| 903| 824| 1088| 969| 1006| mm
F| 878| 1113| 964| 1328| 1144| 1337| mm
G| 953| 1233| 1064| 1428| 1234| 1426| mm
H| –| 1323| 1174| 1538| 1321| 1506| mm
I| 1098| 1438| 1289| 1653| 1444| 1637| mm
L| 1170| 1670| 1440| 1784| 1707| 2032| mm
M| 1338| 1838| 1644| 1988| 1846| 2171| mm
N| Ø 604| Ø 604| Ø 755| Ø 755| Ø 1000| Ø 1000| mm
O| –| –| –| –| 555| –| mm
P| –| –| –| –| –| 1237| mm
It is recommended to install shut-off valves at domestic water inlet and
outlet.
Check the efficiency of the seals when filling/refilling the storage
cylinder.
In case of a probe, any electric junction between probe cable and
extensions for the connection to the electric panel must be soldered and
protected with a sheath or a suitable electric insulation.
Install the magnesium anode supplied (for the models 800 and 1000).
TECHNICAL ASSISTANCE SERVICE
It is essential to perform the following checks before starting upor testing the functioning of the storage cylinder. In particular,check that:
- The supply cocks in the domestic water circuit are all open
- The water connections to the boiler and solar collectors have been made correctly
- All the pipes in the water circuit have been insulated in conformity to relevant standards
- The solar collector circuit has been correctly flushed out and filled with water-glycol mix, and all air has been bled out of the circuit (see the manual for the solar collectors)
- Start up the boiler (if installed) as instructed in its own manual.
- Put the solar collectors into service. See the manuals for the solar collectors and associated accessories.
Once the system has been started up, perform the following checks.
-
Make sure that all pumps are free and rotate in the right direction
-
Make sure that all circuits have been bled.
-
Make sure that the boiler and solar collectors connected to the system shut down correctly when their mains power switches are turned OFF.
Provided the above checks have been completed satisfactorily, restart the system and verify its performance.
TEMPORARY SHUTDOWN
If you are going away for a short period of time like a weekend or a short holiday, etc., and outdoor temperatures are going to remain above ZERO, proceed as follows.
- Adjust the storage cylinder thermostat to its minimum setting.
**** If the temperature to which the heater is exposed can fall below 0°C (frost hazard), perform the operations described in paragraph “Preparing for extended periods of disuse”.
PREPARING FOR EXTENDED PERIODS OF DISUSE
If the storage cylinder is not going to be used for an extended period of time, perform the following operations:
-
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 circuit.
**** Drain the central heating circuit and domestic hot water circuit if there is any risk of freezing.
MAINTENANCE
Scheduled maintenance is essential for the safety, efficiency and long working
life of your storage cylinder. Proper maintenance also reduces energy
consumption and ensures reliability over time. Have your storage cylinder
serviced either by the manufacturer’s
Technical Assistance Service or by a qualified heating engineer 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 circuit
-
Drain the storage cylinder’s DHW (secondary) water circuit.
CLEANING AND REMOVING INTERNAL COMPONENTS
EXTERNAL CLEANING
Clean the outside of the storage cylinder 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 storage cylinder
after cleaning it.
Do not use abrasive products, petrol or diethylene.
INTERNAL CLEANING
Removing and checking the first magnesium anode
If the magnesium anode is fitted in the top of the storage cylinder, remove
the cover (1) and insulation (2), and use a suitable wrench to unscrew the
anode holder(3).
If the magnesium anode is fitted in position (A), remove the cover (4) and use
a suitable wrench to unscrew the anode holder (3).
Check the magnesium anode for wear and replace it if necessary.
On completion of cleaning, follow the above steps in the reverse order to
refit all removed parts.
NOTE: Tighten the anode plug to a torque of 25-30 Nm.
Cleaning inside the storage cylinder
- Remove the screws (4)
- Remove the flange cover (5)
- Remove the insulation (6)
- Unscrew the bolts (7) and remove the cover (8)
- Remove the seal (9)
- Clean inside the storage cylinder and remove any residues through the access hole.
Check the seal for wear and replace it if necessary.
On completion of cleaning, follow the above steps in the reverse order to
refit all removed parts.
Tighten the bolts (7), proceeding diagonally around the flange to apply
pressure uniformly around the seal.
- Fill the storage cylinder’s DHW (secondary circuit) and check that there are no leaks from any of the seals
- Check the performance of the storage cylinder.
16.1 Troubleshooting
SUPPLEMENTARY HEATING CIRCUIT
FAULT | CAUSE | SOLUTION |
---|
The storage cylinder functions incorrectly or
irregularly| Flow rate too high| – Fit a pressure limiter
– Fit a flow reducer
There are blockages or deposits in the domestic hot water circuit| – Check and
clean as necessary
Filling pump| – Check the pump
The water temperature from the boiler is too low| – Check the setting
There is air in the primary circuit| – Bleed the circuit
SOLAR COLLECTOR CIRCUIT
FAULT | CAUSE | SOLUTION |
---|
The storage cylinder functions incorrectly or
irregularly| There is air in the circuit| – Bleed the circuit
The flow rate is too low or too high| – Check the flow rate of the collector
circuit
Pressure is too low| – Check that circuit pressure is approxi- mately 3 bar
when cold
There is lime scale or sludge in the cylinder| – Check and clean as necessary
The storage cylinder loses a lot of heat
overnight| There is natural circulation to the collectors| – Make sure
that the non-return valve is efficient and closes properly. Replace if
necessary
RECYCLING AND DISPOSAL
The device is primarily composed of:
Material | Component |
---|---|
steel | structural work |
PU (polyurethane) | insulation (models 200 – 550) |
polystyrene – polyester felt | insulation (models 800 – 1000) |
PE (polyethylene) | water connection washers |
ABS (acrylonitrile-butadiene-styrene) | lining and covers |
At the end of the device’s useful life, these components must be separated and disposed of according to current regulations in the country of installation.
END USER
END USER INSTRUCTIONS
Refer to the GENERAL SAFETY INFORMATION and PRECAUTIONS section for safety-
related information.
START-UP
The heater commissioning must be performed by Technical Assistance Service
personnel.
Under certain circumstances, such as after long periods of disuse, the user
may need to re-start it without involving the Technical Assistance Service.
Before doing so, perform the following checks and operations.
- Check that the supply cocks in the domestic water circuit are all open
- Switch the electricity supply ON at the mains power switch and at control panel switch (if fitted).
TEMPORARY SHUTDOWN
To reduce to the environmental impact and save energy, in case of brief
absences, week-ends, short trips, etc., and with external temperatures above
0°C, set the heater temperature control, where available, to the minimum
value.
**** If the temperature to which the heater is exposed can fall below 0°C
(frost hazard), perform the operations described in paragraph “Preparing for
extended periods of disuse”.
PREPARING FOR EXTENDED PERIODS OF DISUSE
If the storage cylinder is not going to be used for an extended period of time, ask the manufacturer’s Technical Assistance Service to make the system safe.
EXTERNAL MAINTENANCE
Clean the outside of the storage cylinder with a soft cloth damped in soapy
water.
Do not use abrasive products, petrol or diethylene.
RIELLO S.p.A.
Via Ing. Pilade Riello, 7
37045 – Legnago (VR)
www.riello.com
The manufacturer strives to continuously improve all products. Appearance,
dimensions, technical specifications, standard equipment
and accessories are therefore liable to modification without notice.
References
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