sylber CFO-25S User manual

SOLAR COLLECTOR
CFO-25S
INSTALLATION MANUAL

This manual, Code 20101512 - Rev. 2 (02/16) comprises 12 pages.
2
Conformity
CONFORMITY
Solar collectors conform to EN 12975 standard and to Solar Keymark certification standard.
b This product must only be used for the purpose for which it is designed and made, as specified by S. S
declines 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
CFO-25S 20099917
CFO-25S (pack of 5) 20099918
Contents
CONTENTS
The following symbols are used in this manual:
b
CAUTION! = Identifies actions that require caution
and adequate preparation.
a
STOP! = Identifies actions that you MUST NOT do.
This manual, Code
- Rev.
comprises
pages.
System layout ................................. 3
Identification.................................. 3
Technical specifications ......................... 4
Connections .................................. 5
Water circuit .................................. 6
Unpacking the product ......................... 7
Handling..................................... 7
Installation ................................... 8
Filling the circuit ............................... 9
Checks ..................................... 10
Maintenance................................. 10

3
System layout
SYSTEM LAYOUT
85
2003
1172
1148
46,5 46,5
Collector
outlet
Collector
return
Collector
probe socket
Glass 3,2 mm.
Connection
ring nut, 1"
Connector Ø 22 mm.
Ventilation holes
Direction of flow of
heat transfer liquid
Identication
IDENTIFICATION
CODICE : 20091463
TIPO : CP25TOS
S/N :
COLLETTORE SOLARE PIANO
DIMENSIONI: 1148X2003X85 mm
SUPERFICIE LORDA: 2,30 m
2
TEMPERATURA DI STAGNAZIONE: 200°C
SUPERFICIE DI APERTURA: 2,16 m
2
CONTENUTO LIQUIDO: 1,6 l
SUPERFICIE ASSORBITORE: 2,15 m
2
PESO A VUOTO: 41 kg LIQUIDO TERMOVETTORE:
ACQUA+GLICOLE PROPILENICO
MAX CONCENTRAZIONE GLICOLE: 50%
MAX PRESSIONE ESERCIZIO: 10 bar
FABBRICATO IN ITALIA
20092485_E4
EN 12975
13000000 BAR CODE 128B
Annodi produzione
SERIALE PROGRESSIVO
da Riello S.p.A.
Certif. 011-7S2505 F
Code
Year of production
Serial Number
Description
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
Serial number plate
by Riello S.p.A.
Made in Italy
Data plate
Data label
To be applied to the back of
the solar collector on installation
Codice . . . . . . . .
Modello . . . . . . .
Matricola . . . . . .
Codice . . . . . . . . . . . . . . . . . . . . .
Tipo . . . . . . . . . . . . . . . . . . . . . . .
Dimensioni. . . . . . . . . . . . . . . . . .
Superficie lorda . . . . . . . . . . . . . .
Superficie di apertura . . . . . . . . .
Superficie assorbitore . . . . . . . . .
Peso a vuoto . . . . . . . . . . . . . . . .
Massima pressione di esercizio .
Temperatura di stagnazione . . . .
Contenuto liquido . . . . . . . . . . . .
Massima concentrazione glicole .
COLLETTORE SOLARE (neutro)
FABBRICATO IN ITALIA da Riello S.p.A.
Liquido termovettore . . . . . . . . . .
COLLS1_IT
Serial N°
Model
Code
b 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.

4
Technical specications
DESCRIPTION
Total area 2,30 m2
Exposed area 2,16 m2
Effective absorption area 2,15 m2
Connections (M) - (M) 1"
Empty weight 41,0 kg
Liquid content 1,6 l
Recommended flow rate for each line per m2of collector 30 l/(h x m2)
Minimum flow rate for each line per m2of collector 12 l/(h x m2)
Maximum flow rate for each line per m2of collector 60 l/(h x m2)
Glass thickness 3,2 mm
Thickness of rock wool insulation 40 mm
Absorption (α)95 %
Emissions (ε)4 %
Maximum permitted pressure 10 bar
Stagnation temperature 200 °C
Maximum number of collectors in a line 6 n°
Efficiency parameters
Description Absorber
surface area
Open surface
area
Gross surface
area U/M
Optical efficiency (ηο) (*) 0,785 0,778 0,726 -
Thermal dispersion factor (a1) (*) 4,61 4,57 4,27 W/(m2K)
Thermal dispersion temperature dependence factor
(a2) (*) 0,0021 0,0021 0,0019 W/(m2K2)
Description U/M
IAM (50°) (*) 0,93 -
Collector efficiency (ηcol) (**) 59,2 %
(*) Tested according to EN 12975, referred to a 33.3%
water-glycol mix, flow rate of 160 l/h, and irradiation G
= 800W/m2.
Tm = (Coll._inlet _temp.+Coll._outlet_temp.)/2
T*m = (Tm-T_ambient)/G
(**) Calculated with a temperature difference of 40K be-
tween the solar collector and the surrounding air, and
with total solar radiation of 1000 W/m2referred to the
exposed area.
Efficiency curve (referred to absorber surface area)
0,75
0,80
0,65
0,70
0,55
0,60
0,45
0,50
0,40
0,35 0 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08
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).
TECHNICAL SPECIFICATIONS

5
Connections
CONNECTIONS
sensor pocket
toward the
heat transfer
circuit
captive nut
ring nut
seal ring
captive nut
ring nut
seal ring
from the
heat
transfer
circuit
captive nut
ring nut
seal ring
insulated connector
pipe
When tightening a
fitting,
HOLD THE OPPO-
SITE
FITTING STEADY
WITH
A SECOND TOOL
to avoid damage
Collectors in the same line must be connected so that the heat transfer fluid flows through them in series. The pipe to the
heat exchanger in the storage cylinder must be connected to the outlet with the temperature sensor socket on the last
collector in the line (see figure). Lines of solar collectors can be connected either in series (provided each line contains
no more than 6 collectors) or in parallel. The complete circuit must always be hydraulically balanced. See the following
sample layouts. Only the proper fittings must be used to connect one collector to another. These are provided separately
and include insulated connector pipes. Do not fix the ends of lines of solar collectors rigidly: leave them free to absorb
thermal expansion. If this is not possible, fit an expansion joint at each end.
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
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 Safety valve
9 Pressure gauge
10 Drain
11 Expansion vessel
12 Pump
13 Flow regulator
14 Flow meter
15 Vent cock
16 Manual bleed valve (acces-
sory)
17 Storage cylinder bottom
temperature sensor
18 Storage cylinder top tem-
perature sensor
19 Heat transfer fluid recovery
M Collector outlet
R Collector return
°C
M
4
4
4
9
8
11
10
13
14
6
12
Water control system
7
5
3
19
11
R
M
2
17
15
16
18
Solar
Regolator
b If copper pipes are used, joints must be hot brazed.
b We recommend the use of stainless steel pipes spe-
cially made for solar collectors for the outlet, return
and probe pipes. The probe cable should be of the
shielded type.
b Do not use plastic or multistrate pipes. Operating
temperature can exceed 180°C.
b Pipe lagging must be able to resist high temperatures
(180°C).
Pressure drop in solar collectors (*)
12
10
8
6
4
2
0
0 50 100 200 250150 300 400
500
350 450
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
UNPACKING THE PRODUCT
The solar collectors are packed in various ways depending
on the number of units supplied:
A In a pack of 1
B
Packages of 5 collectors
Pallet contents:
- collector
- document envelopes containing instruction manual, bar
code labels and data label.
b
Take care not to lose the two at seal rings (1) located in
the corner proles of each collector.
b The instruction manual is an integral part of the solar
connector. Once located, read it thoroughly and keep
it safe.
b
STORE IN A DRY PLACE AND DO NOT EXPOSE TO DI-
RECT SUNLIGHT UNTIL THE TIME OF INSTALLATION!
The packaging is not designed to protect the prod-
uct against rain or humidity. It can also degrade if ex-
posed to direct sunlight. Failure to comply with these
precautions could lead to irreparable damage to the
product.
b
A protective lm is applied to the glass of the solar col-
lector. On completion of installation, only remove this
lm if you are going to put the system into service im-
mediately.
A B
1
1
Handling
HANDLING
- Remove the PVC wrapping to free the solar collector from
the pallet.
- Apply the data label (provided in the document enve-
lope) to the back of the solar collector
Once you have removed the outer packaging, proceed as
follows to unpack and handle the solar collector:
- 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.
b Wear suitable personal protective equipment and use
suitable safety devices.
a Do 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 packag-
ing material in compliance with applicable legislation.
a Do not lift the solar collector by its water fittings.
Data label
A
A
A
A
Codice . . . . . . . .
Modello . . . . . . .
Matricola . . . . . .
Codice . . . . . . . . . . . . . . . . . . . . .
Tipo . . . . . . . . . . . . . . . . . . . . . . .
Dimensioni. . . . . . . . . . . . . . . . . .
Superficie lorda . . . . . . . . . . . . . .
Superficie di apertura . . . . . . . . .
Superficie assorbitore . . . . . . . . .
Peso a vuoto . . . . . . . . . . . . . . . .
Massima pressione di esercizio .
Temperatura di stagnazione . . . .
Contenuto liquido . . . . . . . . . . . .
Massima concentrazione glicole .
COLLETTORE SOLARE (neutro)
FABBRICATO IN ITALIA da Riello S.p.A.
Liquido termovettore . . . . . . . . . .
COLLS1_IT

8
Installation
INSTALLATION
b
Solar collectors must be installed with the correct mount-
ing kit (which includes all necessary rails and brackets) as
listed in the Catalogue.
GENERAL INSTRUCTIONS
Protective lm
A protective film is applied to the glass of the solar collector to
protect the absorber against solar irradiation and prevent the so-
lar 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 film as it may be electrostatically charged. Do
not leave the protective film in place for longer than 12 months.
Once removed, the protective film cannot be re-used. Dispose
of the protective film in compliance with legislation 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 fixing 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 verified on site by a person expert in static load-
ing before the solar collector is installed. During this process, it is
important to verify the suitability of the supporting frame to hold
the screw fasteners that fix the solar collector in place. An expert
in static loading must verify that the entire frame complies with
relevant standards, especially in areas liable 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 mm
2
. If a lightning con-
ductor system is already installed, the solar collectors may be
connected to the existing system. Alternatively, the solar collector
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 compensation
bar through a wire of the same diameter.
Water connections
When solar collectors are installed in a line, they must be in-
ter-connected by means of expansion fittings. Fit seal rings at
both ends of the connection fittings, taking care to ensure that
they are correctly positioned in their seats. Make all the neces-
sary connections, then check that all the ring nuts are properly
tightened. If the pipes used to connect the ends of the solar col-
lector line to the rest of the system are not sufficiently flexible to
absorb the stress imparted by thermal expansion, fit compen-
sating devices at both ends of the line (U-type expansion joints,
sections of flexible 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 fitting with a pipe wrench or
spanner, always hold the opposite fitting steady with a second
tool to avoid damaging the absorber.
b
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 between
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 fittings, connections,
bleed and vent valves against dirt and dust etc. In installations
which serve primarily to produce domestic hot water in the sum-
mer, 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 production with central heating), in-
stall 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°.
b
The collectors must be installed at a safe distance from
live electrical power lines and electrical systems in accord-
ance with the laws and regulations in force in the coun-
try of installation. In the absence of specific standards,
the minimum distance that must be maintained between
the installation and the nearest point to which power lines
approach when blown by the wind and sagging in warm
climatic conditions is: 3 m for rated voltages of 1 kV; 3.5 m
for rated voltages between 1 and 30 kV; 5 m for rated volt-
ages between 30 and 132 kV; 7 m for rated voltages >132
kV and for unknown voltages. All non-electrical installation
work that has to be performed near live and unprotect-
ed electrical power lines when there is any possibility of
contact with them must be carried out in conformity to the
laws and regulations in force in the country of installation.
WARNING! Contact with open, live electrical wires may
lead to electrocution and may even be fatal.
b
Always wear safety goggles when drilling. Always wear
safety shoes, cut-proof protective gloves and a safety hel-
met when performing installation work.
b
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.
b
Only wear overalls that have a safety harness (with a suit-
able 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.
b
The use of ladders leaned against walls can lead to seri-
ous falls if the ladder slips, slides of falls. When using lad-
ders, 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.
b Ventilation holes in the collectors allow the air inside
to circulate, expand and contract freely during heat-
ing and cooling 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 efficiency as it dissi-
pates when the collector warms up in the day.

9
Filling the circuit
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, flush out the system to remove any brazing resi-
dues. Seal test the system after you have flushed it out.
b Fill the solar collector with glycol/water mix immedi-
ately after flushing it out, because flushing 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 vol-
umes and must be premixed with water in a suitable con-
tainer before being used to fill the system. For example,
a mix of 40% glycol and 60% water provides anti-freeze
protection down to a temperature of -21°C.
b The propylene glycol supplied is specially formulat-
ed for solar collector applications and remains fully
efficient throughout the -32 to +180°C temperature
range. It is also non-toxic, biodegradable and bio-
compatible.
b Do NOT part fill the circuit with pure glycol then add
water later.
3 - FILLING
b
Only ll and bleed the solar circuit at ambient temper-
ature, 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
figure alongside) and keep it open throughout the filling
operation
3 Open the vent valve (7)
4 Pump the heat transfer fluid around the circuit with an
external filling pump until all air bubbles have been
eliminated. 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 field
9 Close the non-return valve (A) and any open vent valves
to prevent the heat transfer fluid from evaporating.
b Make sure that you have bled all the air out of the sys-
tem, using the water control system vent too.
Heat transfer fluid filling 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
°C
M
A
R
M
7
Manual
bleed valve
(accessory)
Anti-freez mix
Water control system
Heat
transfer fluid
filling pump
Solar collector
Heat exchanger
of solar

10
H
H Pressure 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.
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 fluid = ____
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 fixing 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.
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 fluid = ____
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 fixing 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 pro-
tection 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 trans-
fer liquid.

11

20101512 - Rev. 2 (02/16)
www.sylber.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.