Beretta SCF-20N User manual

SOLAR
COLLECTOR
SCF-20N
INSTALLATION MANUAL
SOLAR

This manual, Code 20051442 - Rev. 2 (01/14) 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 B. B
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
MODEL CODE
SCF-20N 20050326
SCF-20N (pack of 2) 20050328
SCF-20N (pack of 7) 20050329
RANGE
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
1120
1086
1856
68
90
(*)
(**)
(*) Alternative
collector return
(**) Alternative
collector outlet
bThe outlet and the
return must be
connected to
opposite sides.
Collector
probe socket
Collector
outlet
Collector
return
Direction of flow of
heat transfer liquid
Glass 3,2 mm.
Connector Ø 22 mm.
Identication
IDENTIFICATION
Code
Year 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
Data plate
Serial number plate
CODICE : 20038360
FABBRICATO IN ITALIA
DESCRIZIONE : CP20TSA
S/N :
COLLETTORE SOLARE PIANO
DIMENSIONI: 1856X1087X90 mm
SUPERFICIE LORDA: 2,02 m
2
TEMPERATURA DI STAGNAZIONE: 198 °C
SUPERFICIE DI APERTURA: 1,81 m
2
CONTENUTO LIQUIDO: 1,5 l
SUPERFICIE ASSORBITORE: 1,77 m
2
PESO A VUOTO: 30 kg LIQUIDO TERMOVETTORE:
ACQUA+GLICOLE PROPILENICO
MAX CONCENTRAZIONE GLICOLE: 50%
MAX PRESSIONE ESERCIZIO: 10 bar
da Riello S.p.A.
20038499_E1
EN 12975
Certif. 011-7S1765 F
12000025
Anno di produzione
SERIALE PROGRESSIVO
Cod.
Mod.
Serial number
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 2,02 m2
Exposed area 1,81 m2
Effective absorption area 1,77 m2
Connections (copper pipe) 4 x Ø 22 mm
Empty weight 30 kg
Liquid content 1,5 l
Recommended flow rate for each line per m2of collector 30 l/(h x m2)
Minimum flow rate for each line per m2of collector 20 l/(h x m2)
Maximum flow rate for each line per m2of collector 200 l/(h x m2)
Glass thickness 3,2 mm
Absorption (α)~ 95 %
Emissions (ε)~ 5 %
Maximum permitted pressure 10 bar
Stagnation temperature 198 °C
Maximum number of collectors in a line 6 n°
Efficiency curve
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]
*
Optical efficien-
cy of absorber
(ηο)
Thermal dispersion factor of
absorber
a1 W/(m2K) a2 W/(m2K2)
0,764 4,33 0,0069
Tested according to EN 12975, referred to a 33.3% wa-
ter-glycol mix, flow rate of 75 l/h, and irradiation G =
800W/m2.
Tm = (Coll._inlet _temp.+Coll._outlet_temp.)/2
T*m = (Tm-T_ambient)/G
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
sensor
pocket
toward the
heat transfer circuit
from the
heat transfer circuit
ring nut
ring nut
olive
straight union
olive
plugs
olive
plugs
olive
straight
union
pipe
installation
ring nut
ring nut
olive
straight
union
ring nut
ring nut
ring nut
ring nut
olive
straight union
pipe
installation
The collectors in a line are connected so that the heat transfer fluid goes through them in parallel. Therefore the four
copper tubes between the collectors are connected between them by brass compression fittings for copper pipes. Two
out of four of the copper tubes of the extreme collectors of the line must be sealed with brass compression stop ends.
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. The connection with the circuit that comes back from the heat exchanger must be at the
bottom of the first collector of the line (see the picture above).
It is also possible to connect more then one line of solar collectors using brass compression elbows or welding the tubes
of the circuit.
Multi-collector installations must consist of strings of the same number of collectors (see the following sample diagrams).
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"
CONNECTIONS

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 Plugs
18 Heat transfer fluid recovery
M Collector outlet
R Collector return
3
11
R
M
°C
M
4
4
4
9
8
11
10
13
14
2
6
12
Water control system
5
7
15
16
17
17
18
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 (*)
Pressure drop (mbar)
Flow rate (l/h)
15
12,5
10
7,5
5
2,5
0
0 50 100 150 200 250 300 350
400
(*) 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 Packages of 1 or 2 collectors
B
Packages of 7 collectors
Pallet contents:
- collector
- document envelopes containing instruction manuals,
test certificate and bar code label.
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.
A B
Handling
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.
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.
A
A
A
A

8
Installation
INSTALLATION
GENERAL INSTRUCTIONS
Assembly
The system must be installed by specialist personnel. Use
only the assembly material supplied with the solar collec-
tor. The supporting framework and all masonry or brick-
work 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 ex-
pert in static loading 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 stand-
ards, 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 con-
nected to the main potential compensation bar by a (yel-
low-green) copper wire (H07 V-U or R) of at least 16 mm2. If
a lightning conductor system is already installed, the solar
collectors may be connected to the existing system. Alter-
natively, 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
The solar collectors must be connected in series using the
fittings and seal rings provided. If flexible hoses are not
used to connect up the ends of solar collector lines, we
recommend that you fit devices in the connecting pipes
to permit thermal expansion (U-type expansion joints, sec-
tions of flexible hose or dedicated expansion joints). Pro-
vided adequate expansion joints are used, up to 6 solar
collectors may be connected in series. Make sure that the
seal rings are correctly positioned in their seats. 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 con-
formity 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 pri-
marily to produce domestic hot water in the summer, install
the collectors facing from east to west at an angle of be-
tween 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), 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°.
b Work near uncovered and live electrical wires, with
which it is possible to come into contact, is only per-
mitted 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 dis-
tances must be respected: 1m (for voltages 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.
b Always wear safety goggles when drilling. Always
wear safety shoes, cut-proof protective gloves and a
safety helmet when performing installation work.
b Before beginning installation work on roofs, install the
necessary fall prevention and fall arrest devices and
ensure that all applicable safety standards are ap-
plied. 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
suitable 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
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
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
Anti-freeze mix
Water control system
Heat
transfer fluid
filling pump
Solar collector
Manual
bleed valve
(accessory)
Heat e
xchanger
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
transfer liquid.

11

20051442 - Rev. 2 (01/14)
Via Risorgimento, 13 - 23900 Lecco (LC) - Italy
Customer Service 199.13.31.31
www.berettaclima.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.