Riello CS 25 R Plus Pack of 3 User manual

cod. 20059203 rev. 8 01/2016
CS 25 R Plus
EN INSTALLATION INSTRUCTIONS

2
This booklet code 20059203 - Rev. 8 (01/2016)
comprises 12 pages.
Conformity
CONFORMITY
Solar collectors conform to EN 12975 standard and to Solar Keymark certication standard.
9 This product must only be used for the purpose for which it is designed and made, as specied by R. Rdeclines all
responsibility, contractual or other, for damage to property or injury to persons or animals caused by improper installation,
adjustment, maintenance or use.
Range
RANGE
MODEL CODE
CS 25 R Plus 20059157
CS 25 R Plus (Pack of 2) 20059158
CS 25 R Plus (Pack of 3) 20059159
CS 25 R Plus (Pack of 5) 20059160
Contents
CONTENTS
The following symbols are used in this manual:
9 CAUTION! = Identies actions that require caution and
adequate preparation.
0 STOP! = Identies actions that you MUST NOT do.
This booklet code
- Rev.
comprises
pages.
1 System layout ................................3
2 Identication ................................3
3 Technical specications.........................4
4 Connections .................................5
5 Water circuit .................................6
6 Unpacking the product .........................7
7 Handling....................................7
8 Installation ..................................8
9 Filling the circuit ..............................9
10 Checks .................................... 10
11 Maintenance................................ 10

3
System layout
1 SYSTEM LAYOUT
100
1265
1240
2078
83
Collector
probe socket
Collector
outlet
Collector
return
Direction of flow of
heat transfer liquid
Glass 4 mm
Connector Ø 22 mm
Connection
ring nut, 1"
Ventilation holes
Identication
2 IDENTIFICATION
FABBRICATO IN ITALIA
DESCRIZIONE : CP25VVAR
S/N :
COLLETTORE SOLARE PIANO
DIMENSIONI: 2076X1238X100 mm
SUPERFICIE LORDA: 2,57 m
2
TEMPERATURA DI STAGNAZIONE: 201,7 °C
SUPERFICIE DI APERTURA: 2,30 m
2
CONTENUTO LIQUIDO: 1,6 l
SUPERFICIE ASSORBITORE: 2,15 m
2
PESO A VUOTO: 45 kg LIQUIDO TERMOVETTORE:
ACQUA+GLICOLE PROPILENICO
MAX CONCENTRAZIONE GLICOLE: 50%
MAX PRESSIONE ESERCIZIO: 10 bar
da Riello S.p.A.
EN 12975
Certif. 011-7S1983 F
12000025
Anno di produzione
CODICE : 20059133
20059135_E1
SERIALE PROGRESSIVO
Data plate
Serial number plate
Code
Y
ear of production
Serial Number
Description Made in Italy
by Riello S.p.A.
Flat plate
solar collector
Dimensions
Gross area
Aperture area
Absorber area
Empty weight
Maximum operating pressure
Stagnation temperature
Liquid content
Max glycol concentration
Heat transfer fluid:
water+propylene glycol
RIELLO S.p.A.
Via degli Alpini, 1 - 37045 Legnago (VR) - ITALIA
Matricola
Modello
Codice
9 If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installation and ser-
vicing may be rendered difcult.

4
Technical specications
3 TECHNICAL SPECIFICATIONS
DESCRIPTION
Total area 2,57 m2
Exposed area 2,30 m2
Effective absorption area 2,15 m2
Connections (M) - (F) 1"
Empty weight 45 kg
Liquid content 1,6 l
Recommended ow rate for each line per m2of collector 30 l/(h x m2)
Minimum ow rate for each line per m2of collector 12 l/(h x m2)
Maximum ow rate for each line per m2of collector 60 l/(h x m2)
Glass thickness 4mm
Absorption (α)~ 95 %
Emissions (ε)~ 4 %
Maximum permitted pressure 10 bar
Stagnation temperature 201,7 °C
Maximum number of collectors in a line 6n°
Efciency parameters
Description Absorber surface
area Open surface area Gross surface area U/M
Optical efciency (ηο) (*) 0,809 0,758 0,675 -
Thermal dispersion factor (a1) (*) 3,72 3,49 3,1 W/(m2K)
Thermal dispersion temperature dependence factor
(a2) (*) 0,011 0,0103 0,0092 W/(m2K2)
Description U/M
IAM (50°) (*) 0,85 -
Efciency (ηcol) (**) 60 %
(*) Tested according to EN 12975, referred to a 33,3% water-
glycol mix, ow rate of 190 l/h, and irradiation G = 800 W/
m2.
Tm = (Coll._inlet _temp.+Coll._outlet_temp.)/2
T*m = (Tm-T_ambient)/G
(**) Calculated with a temperature difference of 40K between
the solar collector and the surrounding air, and with total
solar radiation of 1000 W/m2referred to the exposed area.
Efciency curve (referred to absorber surface area)
1
0,8
0,6
0,4
0,2
00 0,02 0,04 0,06 0,08 0,1
0,12
Tm[m
2
K/W]
*
WIND AND SNOW LOADS ON COLLECTORS
Installation height
above ground Wind speed
Mass in kg to secure collector against
lifting by wind
Load on roof from wind, snow, and
collector weight
At angle of 45°At angle of 20°At angle of 45°At angle of 20°
0 - 8 m 100 km/h 80 kg 40 kg 320 kg 345 kg
8 - 20 m 130 km/h 180 kg 90 kg 470 kg 430 kg
20 - 100 m 150 km/h 280 kg 150 kg 624 kg 525 kg
Maximum permitted load from wind and snow (including combined loads) on surface of collector: 1500 Pa (175 km/h).

5
Connections
4 CONNECTIONS
half union
ring nut
seal ring
male union
sensor pocket
seal ring
toward the
heat transfer
circuit
When tightening a fitting,
HOLD THE OPPOSITE
FITTING STEADY WITH
A SECOND TOOL
to avoid damage
seal ring
from the
heat transfer circuit
The collectors in a line are connected so that the heat transfer uid goes through them in series. The connection with the heat
transfer circuit that goes toward the heat exchanger must be the one near the sensor pocket of the last collector of the line (see the
picture above). It is also possible to connect more then one line of solar collectors both in series (max 6 collectors in series) or in
parallel. Anyway the circuit must be hydraulically balanced (see the following schemes as an example).
Two lines in series Two lines in parallel
T T
Diameter of connection pipes for a specic ow rate of 30 lt/m2h
Total surface area (m2)2 - 4 6 - 12 14 - 20
Diameter of copper pipe (mm) 10 - 12 14 18
Diameter of steel pipe (inch) 3/8" - 1/2" 1/2" 3/4"

6
Water circuit
5 WATER CIRCUIT
1 Solar collector
2 Storage cylinder
3 Collector probe
4 Disconnect valves
5 Non-return valve
6 Temperature gauge
7 Vent valve
8 Relief valve
9 Pressure gauge
10 Drain
11 Expansion vessel
12 Pump
13 Flow regulator
14 Flow meter
15 Vent cock
16 Manual bleed valve (accessory)
17 Storage cylinder bottom tem-
perature sensor
18 Storage cylinder top tempera-
ture sensor
19 Heat transfer uid recovery
MCollector outlet
RCollector return
°C
M
4
4
4
9
8
11
10
13
14
6
12
7
5
19
3
11
RM
17
18
2
15
16
Water control system
Solar
Regulator
9 If copper pipes are used, joints must be hot brazed.
9 We recommend the use of stainless steel pipes specially
made for solar collectors for the outlet, return and probe
pipes. The probe cable should be of the shielded type.
9 Do not use plastic or multistrate pipes. Operating tempera-
ture can exceed 180°C.
9 Pipe lagging must be able to resist high temperatures (180°C).
Pressure drop in solar collectors (*)
140
120
100
80
60
40
20
0
0 100 200 300 400 500 600 700 800 900
1000
Pressure drop (mbar)
Flow rate (l/h)
(*) With antifreeze-water mix of 33,3% / 66,7% and heat transfer medium temperature = 20°C.

7
Unpacking the product
6 UNPACKING THE PRODUCT
The solar collectors are packed in various ways depending on
the number of units supplied:
APackages of 1, 2 or 3 collectors
BPackages of 5 collectors
Pallet contents:
−collector
−document envelopes containing instruction manuals,
spare parts catalogue, test certicate, warranty certi-
cate and bar code labels.
9 The instruction manual is an integral part of the solar con-
nector. Once located, read it thoroughly and keep it safe.
9 STORE IN A DRY PLACE AND DO NOT EXPOSE TO DIRECT SUNLIGHT
UNTIL THE TIME OF INSTALLATION! The packaging is not de-
signed to protect the product against rain or humidity. It can
also degrade if exposed to direct sunlight. Failure to comply
with these precautions could lead to irreparable damage to
the product.
9 A protective lm is applied to the glass of the solar collec-
tor. On completion of installation, only remove this lm if
you are going to put the system into service immediately.
A B
Handling
7 HANDLING
Once you have removed the outer packaging, proceed as follows
to unpack and handle the solar collector:
−Remove the PVC wrapping to free the solar collector from
the pallet.
−Tilt the solar collector slightly and grip it at the four points
shown (A) to lift it.
−Use a hoist or other suitable lifting equipment to hoist
the solar collector on to the roof.
9 Wear suitable personal protective equipment and use suit-
able safety devices.
0 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 com-
pliance with applicable legislation.
0 Do not lift the solar collector by its water ttings.
A
A
A
A

8
GENERAL INSTRUCTIONS
Protective lm
A protective lm is applied to the glass of the solar collector to
protect the absorber against solar irradiation and prevent the
solar collector from becoming too hot if it is not going to be put
into service immediately. Fill the system, but do not remove
the lm until you are ready to put the system into service.
Take care when removing the lm as it may be electrostatical-
ly charged. Do not leave the protective lm in place for longer
than 12 months. Once removed, the protective lm cannot be
re-used. Dispose of the protective lm in compliance with leg-
islation governing the disposal of PVC.
Assembly
The system must be installed by specialist personnel. Use only
the assembly material supplied with the solar collector. The sup-
porting framework and all masonry or brickwork xing points
must be checked by a person expert in static loading, and must
be suitable for the nature of the installation site.
Static load
The solar collector must only be installed on roofs or frames
that are strong enough to support its weight. The strength of
the roof or frame must be veried on site by a person expert in
static loading before the solar collector is installed. During this
process, it is important to verify the suitability of the support-
ing frame to hold the screw fasteners that x the solar collector
in place. An expert in static loading must verify that the entire
frame complies with relevant standards, especially in areas lia-
ble to snow and areas exposed to high winds. Conditions (gusts
of wind, formation of wind vortices, etc.) at the point where the
solar collector is to be installed must be carefully considered
since these can increase the loads on the supporting structure.
Lightning protection
The metal piping of the solar heating circuit must be connect-
ed to the main potential compensation bar by a (yellow-green)
copper wire (H07 V-U or R) of at least 16 mm2. If a lightning con-
ductor system is already installed, the solar collectors may be
connected to the existing system. Alternatively, the solar collec-
tor piping may be connected to ground via a ground wire sunk
into the earth. Ground wires must be sunk outside the house.
The ground wire must be connected to the potential compensa-
tion bar through a wire of the same diameter.
Water connections
When connecting solar collectors in a line, t seal rings at both
ends of the connection ttings, taking care to ensure that they
are correctly positioned in their seats. Make all the necessary
connections, then check that all the ring nuts are properly tight-
ened. If the pipes used to connect the ends of the solar collector
line to the rest of the system are not sufciently exible to ab-
sorb the stress imparted by thermal expansion, t compensat-
ing devices at both ends of the line (U-type expansion joints,
sections of exible hose or dedicated expansion joints). Up to 6
collectors may be connected in a line, but only if the above pro-
visions are made. When tightening a tting with a pipe wrench
or spanner, always hold the opposite tting steady with a sec-
ond tool to avoid damaging the absorber.
9 All pipes in the water circuit must be insulated in conform-
ity to relevant standards. Lagging and insulation must be
protected against damage by the weather and birds and
animals.
Angle of collectors / General
Solar collectors are designed to be installed at angles of be-
tween 15° (minimum) and 75° (maximum). Make sure that the
bleed and vent valves of the collectors remain open while the
collectors are being installed. Take care to protect all ttings,
connections, bleed and vent valves against dirt and dust etc.
In installations which serve primarily to produce domestic hot
water in the summer, install the collectors facing from east to
west at an angle of between 20 and 60°. The ideal orientation
is southwards, at an angle equal to the latitude of the location
minus 10°. If the system sustains the greatest thermal load in
the winter (as in systems that combine domestic hot water pro-
duction with central heating), install the collectors facing south
(or south-east or south-west) at an angle greater than 35°. The
ideal orientation is southwards, at an angle equal to the latitude
of the location plus 10°.
9 Work near uncovered and live electrical wires, with which
it is possible to come into contact, is only permitted under
the following conditions: wires must be free from voltage for
the entire duration of the work; parts remaining live must
be covered or accidental contact prevented; the following
minimum safety distances must be respected: 1m (for volt-
ages of up to 1000 Volts), 3m (for voltages from 1000 to 11000
Volts), 4m (for voltages from 11000 to 22000 Volts), 5m (for
voltages from 22000 to 38000 Volts), >5m (if the voltage is
not known). Contact with open, live electrical wires may
lead to electrocution and may even be fatal.
9 Always wear safety goggles when drilling. Always wear safe-
ty shoes, cut-proof protective gloves and a safety helmet
when performing installation work.
9 Before beginning installation work on roofs, install the nec-
essary fall prevention and fall arrest devices and ensure that
all applicable safety standards are applied. Use only tools
and materials that conform to the safety standards that are
applicable in the place of work.
9 Only wear overalls that have a safety harness (with a suita-
ble safety or fall-arrest belt, ropes or slings, fall dampers or
dissipaters). In the absence of adequate fall prevention and
security devices, failure to use a proper safety harness may
lead to falls from great heights with serious or even fatal
consequences.
9 The use of ladders leaned against walls can lead to serious
falls if the ladder slips, slides of falls. When using ladders,
always ensure that they are stable, and that suitable ladder
stops are present. If possible secure the ladder with hooks.
Make sure that there are no live electrical wires near the
ladder.
9 In recessed installations (surrounded by ashing), make
sure that water cannot ow over the glass panel of the solar
collector from cement, brickwork or masonry. For this rea-
son, it is essential to avoid installing the collector under ce-
ment work, chimneys and other structures.
9 Do not use this kit for recessed installations (surrounded by
ashing) on slate roofs.
9 Use only soap and water to clean the glass panels of the col-
lectors. Rinse with clean water after cleaning. Use soft cloths
to clean the glass. Do not use abrasive materials or corrosive
substances.
9 Ventilation holes in the collectors allow the air inside to cir-
culate, expand and contract freely during heating and cool-
ing cycles. Condensation can form on the inside of the glass
as a result of cooling overnight or even under conditions of
high humidity during the day. This phenomenon is normal
and must not be considered a defect. This condensation has
no impact on the collector’s thermal efciency as it dissi-
pates when the collector warms up in the day.
8 INSTALLATION

9
Filling the circuit
9 FILLING THE CIRCUIT
Perform the following steps before starting up the system.
1 - FLUSHING AND SEAL TESTING THE SYSTEM
If copper piping has been used and joints have been hot brazed,
ush out the system to remove any brazing residues. Seal test
the system after you have ushed it out.
9 Fill the solar collector with glycol/water mix immediately
after ushing it out, because ushing water may remain
trapped in the circuit (with a consequent risk of freezing).
2 - PREMIXING WATER + GLYCOL
Glycol anti-freeze is supplied separately in standard volumes
and must be premixed with water in a suitable container before
being used to ll the system. For example, a mix of 40% glycol
and 60% water provides anti-freeze protection down to a tem-
perature of -21°C.
9 The propylene glycol supplied is specially formulated for solar
collector applications and remains fully efcient throughout
the -32 to +180°C temperature range. It is also non-toxic,
biodegradable and biocompatible.
9 Do NOT part ll the circuit with pure glycol then add water
later.
3 - FILLING
9 Only ll and bleed the solar circuit at ambient tempera-
ture, with the collectors shielded from the sun’s rays.
1 Open the non-return valve (A)
2 Open the air vent at the highest point in the system (see
gure alongside) and keep it open throughout the lling
operation
3 Open the vent valve (7)
4 Pump the heat transfer uid around the circuit with an ex-
ternal lling pump until all air bubbles have been eliminat-
ed. Close the manual bleed valve
5 Temporarily raise the pressure in the system to 4 bar
6 Start up the system for about 20 minutes
7 Bleed the circuit again from step 2 until all the air has been
removed
8 Set the circuit pressure according to the table on the next
page in order to ensure a minimum pressure of 1.5 bar at the
height of the collector eld
9 Close the non-return valve (A) and any open vent valves to
prevent the heat transfer uid from evaporating.
9 Make sure that you have bled all the air out of the system,
using the water control system vent too.
Heat transfer uid lling pump (accessory). A manual bleed
valve is not required if this pump is used.
Anti-freeze Temperature Density
50% -32 °C 1.045 kg/dm3
40% -21 °C 1.037 kg/dm3
30% -13 °C 1.029 kg/dm3
M
A
R
M
7
°C
Manual
bleed valve
(accessory) Solar collector
Heat
transfer fluid
filling pump
Anti-freeze mix
Water control system
Heat e
xchanger
of solar

10
H
HPressure at boiler
up to 15 m 3 bar
15 - 20 m 3,5 bar
20 - 25 m 4 bar
25 - 30 m 4,5 bar
General rule: p [bar] = 1.5 + H [m] / 10
Checks
On completion of the installation, perform the checks listed in the table below.
10 CHECKS
Collector circuit
Cold circuit pressure:____bar (see table above)
Collector circuit seal test
Safety valve check
Anti-freeze checked to - ___ °C
pH of heat transfer uid = ____
Collector circuit bled
Flow rate of 30 l/h per m2checked
Non-return valve functioning
Solar collectors
Visual check of collectors
Collectors cleaned if necessary
Visual check of collector xing points
Visual check of roof impermeability
Visual check of insulation/lagging
Maintenance
Service the system and perform the checks listed in the tables below at least once every two years.
11 MAINTENANCE
Collector circuit
Cold circuit pressure:____bar (see table above)
Collector circuit seal test
Safety valve check
Anti-freeze checked to - ___ °C
pH of heat transfer uid = ____
Collector circuit bled
Flow rate of 30 l/h per m2checked
Non-return valve functioning
Solar collectors
Visual check of collectors
Collectors cleaned if necessary
Visual check of collector xing points
Visual check of roof impermeability
Visual check of insulation/lagging
Checking the heat transfer liquid
Check the anti-freeze effect and the pH level of the heat transfer liquid every 2 years.
−Use an instrument like a refractometer or densimeter to check the anti-freeze effect (which must have a nominal protection
value of approx. -30°C). If the protection threshold is higher than -26°C, replace the mix, or add anti-freeze as required.
−Use litmus paper to check the pH (nominal value approx. 7.5). If the measured value is below 7, change the heat transfer
liquid.

11

RIELLO S.p.A.
37045 Legnago (VR) - Italy
Tel. [phone] - Fax [phone] - www.riello.it
The manufacturer strives to continuously improve all products. Appearance, dimensions, technical specications, standard equipment
and accessories are therefore liable to modication without notice.