RIELLO RBS 2S Boiler for Solar Heating System User Manual

RBS 2S
INSTALLATION, OPERATION AND MAINTENANCE MANUAL

cod. 20116337 rev. 1005/2023

GENERAL INFORMATION

RANGE

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

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

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

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:

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

• MAX - Sveriges godaste burgare
• Riello Global

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