AMK OWR 20 Technical manual

OWR 20
360° Vacuum Tube Collector
Planning/Installation/
Commissioning
05/14
Manufactured in Switzerland by
www.amk-collectra.ch
Distributed by
www.amk-solac.com
Should you have any technical questions, please contact your sales
consultant of your supplier.
OWR 20 optimized
without
reflector

Quick mounting guide for installation personnel:
Page The solar collector system is to be installed by qualified personnel only.
Packaging +Transport:
3
Store collectors correctly; don’t throw the packaged boxes.Transport collectors in packaging only.
Collector mounting:
Tiled roof 5-9 Work preparations as shown on page 5-8, assembly as shown on page 8-9.
Flat roof 10-13 Work preparations as shown on page 10-11, assembly as shown on page 12-13.
Collector connections
to a collector field:
Compensators and 8/9/12
The screw connections of the compensators are to be tightened with a tightening torque of max. 15 Nm.
U-pipes/Blind caps 8/9/12 The included high temperature flat gaskets must be used.
Sensor placement
in the collector field:
Sensor 9/13
The collector sensor must be inserted into the sensor well all the way (18-19 cm) at the solar liquid outlet
(flow).The sensor cable must be fixed to avoid shifting (e.g. snow load, animals).
Connecting the solar pipes with the solar collector field
Solar pipes 9/13
Attention is to be paid to the male connectors, shown in the pictures on page 9/13.The connection labeled
„hot“ is the flow.The connections must not be confused.
Expansion vessel The correct connection of the expansion vessel is determined by the site management.The pre charge
pressure must be adjusted before the filling of the system.
Expansion vessel pre charge pressure = Ok collector up to middle of expansion vessel in bar + 0.5 bar,
but at least at 1.0 bar
Pressure test After the mounting of the collector field, solar pipes, pump groups and the heat consumers the system
must be checked for absolute leakproofness (e.g. compressed air at 2-3 bar for at least 2-3 hrs.),
or with fluid (e.g. 4 bar for at least 2-3 hrs.)
Filling of the solar system
resp.
21
16
Connect filling station to AO + A1. Fill system slowly.The bleed valve at the pump station is closed.
Remove flow meter. Do not fill in direct sunshine!
Flushing the system
resp.
21
16
The flushing cleans the system and bleeds the whole facility. This flushing is to be done thoroughly and
without interruption.
Solar controller: The controller settings are to be set by the site management. Checking of the correct electric connections. Commissioning: After initial start-up an acceptance testing protocol is to be completed, dated and signed by the installer
and by the operator.This document belongs to the operator of the facility.
IMPORTANT:
Don't use any zinced components in the solar circuit! Tyfocor LS is a complete mixture. Don't mix with water!

2
Contents
0 Data OWR 20 data
Notes 3
General planning notes 4
I Installation Ia Tiled roofs 5
Ib Flat roofs 10
II Commissioning IIa System and dimensioning
- South and east/west systems 14
- OWR 20 dimensioning 15
IIb Hydraulic connections 16
IIc Expansion vessel
- Expansion vessel calculation 17
- Intrinsically safe solar system 18
- Example: expansion vessel calculation 20
IId Protective devices
- Lightning protection 22
- Scald protection 22
- Overheating protection 22
- Safety valve 22
IIe Maintenance/Repair 23
Quick mounting guide for installation personnel: Page The solar collector system is to be installed by qualified personnel only.
Packaging +Transport: 3Store collectors correctly; don’t throw the packaged boxes.Transport collectors in packaging only.
Collector mounting: Tiled roof 5-9 Work preparations as shown on page 5-8, assembly as shown on page 8-9.
Flat roof 10-13 Work preparations as shown on page 10-11, assembly as shown on page 12-13.
Collector connections to a collector field:
Compensators and 8/9/12 The screw connections of the compensators are to be tightened with a tightening torque of max. 15 Nm.
U-pipes/Blind caps 8/9/12 The included high temperature flat gaskets must be used.
Sensor placement in the collector field:
Sensor 9/13 The collector sensor must be inserted into the sensor well all the way (18-19 cm) at the solar liquid outlet
(flow).The sensor cable must be fixed to avoid shifting (e.g. snow load, animals).
Connecting the solar pipes with the solar collector field
Solar pipes 9/13 Attention is to be paid to the male connectors, shown in the pictures on page 9/13.The connection labeled
„hot“ is the flow.The connections must not be confused.
Expansion vessel The correct connection of the expansion vessel is determined by the site management.The pre charge
pressure must be adjusted before the filling of the system. Expansion vessel pre charge pressure = Ok collector up to middle of expansion vessel in bar + 0.5 bar, but at least at 1.0 bar
Pressure test After the mounting of the collector field, solar pipes, pump groups and the heat consumers the system
must be checked for absolute leakproofness (e.g. compressed air at 2-3 bar for at least 2-3 hrs.), or with fluid (e.g. 4 bar for at least 2-3 hrs.)
Filling of the solar system
resp.
21
16
Connect filling station to AO + A1. Fill system slowly.The bleed valve at the pump station is closed. Remove flow meter. Do not fill in direct sunshine!
Flushing the system
resp.
21
16
The flushing cleans the system and bleeds the whole facility. This flushing is to be done thoroughly and without interruption.
Solar controller: The controller settings are to be set by the site management. Checking of the correct electric connections. Commissioning: After initial start-up an acceptance testing protocol is to be completed, dated and signed by the installer
and by the operator.This document belongs to the operator of the facility.
IMPORTANT: Don't use any zinced components in the solar circuit!
Tyfocor LS is a complete mixture. Don't mix with water!

3
OWR 20 data
Notes
Collector angle/installation
The collector can be installed at
any angle between 0° (horizon-
tal) and 90° (vertical).
Installation is possible on roofs,
on walls, or free-standing. An-
gles between 15° and 75° are
optimal.
Position of the collector pipe
The collector can be installed
with the collector pipe either
vertical or horizontal. However,
the application is optimised
for horizontal installation. It is
not possible to install with the
collector pipe at the bottom.
Filling the system
Do not fill the system in direct
sunlight. Danger of steam ham-
mering!
Flow setting
The standard collector flow setting
can be found in the data table.
Manual bleed valves
Only use manual bleed valves
which are stable at high tem-
peratures, and which have no
plastic parts.
Setting the pressures correctly
For trouble-free operation, it
is essential that the pre charge
pressure in the expansion ves-
sel, and the operating pressure
in the solar system, are set cor-
rectly. Correct dimensioning
and correct connection of the
expansion vessel are just as im-
portant (pp. 17-21).
Automatic bleed valves
We do not recommend auto-
matic bleed valves! If, however,
there is no alternative, automat-
ic bleed valves must always be
installed vertically. A mechani-
cal shut-off in the form of a
suitable stop valve is imperative
(see instructions).
Frost risk
Outdoor pipes with no flow-
through are bound to be at risk
from frost. During installation
care must be taken to keep all
outdoor pipes as short as pos-
sible.
Sensor installation
For trouble-free functioning of
the entire system, the sensor
must be inserted 19 cm into the
provided sensor well in the col-
lector on the input/output side.
Devices/Fittings
For trouble-free functioning of
the entire system, it is impera-
tive to install the devices and
fittings described in the product
documentation.
Vacuum test
Reflective tube ends
= vacuum is okay.
Milky tube ends
= vacuum (insulation) damaged.
Notes
Length:
Width:
Height (including frame):
Number of tubes:
Gross surface area:
Aperture area:
Active absorbing area 360°:
Weight:
Total content:
Max. permissible operating pressure:
Recommended volume flow
200 mm
1670 mm
120 mm
20
3.457 m2
1.98 m2
5.46 m2
72.5 kg
3.52 litres
10 bar
1.7 l/min (per module)
Data OWR 20
In addition to the collector frame,
the packaging unit also contains
the associated glass tubes.
These packaging units should be
transported carefully and may not
be dropped or thrown. AMK-Col-
lectra AG cannot extend warranty
cover for improper transport and
will replace defective parts only
against charge.
The packaging units may not be
stored outside.They must be
stored in a dry room and protect-
ed from damage.The temperature
should not be under 15°C and not
above 50°C.The relative air hu-
midity should not exceed 75%.
No hamp seals must be used (e.g.
use high temperature resistant
teflon).
The solar circuit is to be bled thor-
oughly; every circuit must be
flushed separately.
Warning!
Local regulations must be ob-
served during installation!
Packaging, transport
and storage of the
system

4
Snow load: For most collector installation ap-
plications universal collector
mounting sets are available.
These systems are suitable for
most slanted or flat roofs as well
as for mounting to facades and
balcony railings.
All mounting systems are con-
structed for snow loads skof 2,0
kN/m2.
Wind velocity: 80 km/h 130 km/h 180 km/h
22.2 m/s 36.1 m/s 50.0 m/s
0.62 kN/m2 0.82 kN/m2 1.56 kN/m2
Installation angle:
Wind flow frontal α= 30° - * *
α= 45° - * *
α= 60° 1 * *
* not recommended, tension with wire cable required
Additional evaluations by the manufacturer are required for collector arrangements in extreme and exposed positions.
Flat roof mounting:
Our product range offers 2 different concrete elements for the mounting of solar collectors on flat roofs or level
ground:
- Concrete base long, L170 x B20 x H15 cm, 127.5 kg/pc., Article No. 50.8000 (BS-L)
- Concrete base attachment; L20 x B40 x H15cm, 30 kg/pc., Article No. 50.8001 (BS-A)
Our recommendation:
Every angular frame must be loaded with at least one BS-L (127.5 kg).These values are valid for building heights
up to approx. 12.0 m under the assumption of frontal wind flow. If wind flow is from the back separate calculations
for the additional weight loads are required.
Depending on the installation angle the „Concrete bases long“ (BS-L) may need to be loaded with additional BS-A
elements.
For 1 pc. angular frame OWR 20 the following number of attachments (BS-A) per BS-L is required:
(These numbers are valid for collector fields with 2 collectors and more (3 angular frames and more)).
The volume flow per module is:
1.7 l/min or 102 l/h
The fluid is a ready to use, evapo-
ration proof special heat exchange
liquid on 1,2-propylene glycol ba-
sis.
Tyfocor LS is not harmful to health
and the corrosion inhibitors pro-
tect all metal materials usually
used in solar technology, including
in mixed installations.
Tyfocor LS must not be mixed with
other heat exchange fluids or dilut-
ed with water.
It is imperative that collectors that
have been already installed must
be filled and started up within
one week.
Disregard for this can lead to
overheating of the collectors and
cause damages.
Dimensioning of pipe diameters:
When dimensioning the solar
pipes the pressure loss formulas
generally used by heating engi-
neers are to be applied.
In installting the pipes the least
possible number of bends is to be
used (no angle pieces).
The table on page 15 references
the rates of flow, pressure losses
and presumed pipe dimensions in
the collector field.
Collector fields with more than 6
OWR 20 are not recommended.
Collector fields with more than 6
OWR 20 can be split into several
collector fields, interconnected in
parallel.
An exact pressure loss calculation
and expansion vessel calculation is
required for every single system.
The given table is not binding for a
complete installation of a solar
system.
General planning notes

5
Example: installation of 2 OWR 20 collectors
The installation materials
include:
- 2 OWR 20 collectors
- 1 basic tiled roof set
- 1 tiled roof extension set
- 1 basic hydraulics set
- 1 hydraulics extension set
1
2
3
4
5
- 13mm socket spanner/open-ended spanner
- 30mm open-ended spanners (2 x)
- Ø 5.5mm wood drill bit
- hammer
- hacksaw
- folding ruler/metre rule
Push in the connector up to the
centre and tighten both screws.
Push in the second connector
and fasten the screws.
Note: The mounting angles and
the connector will later come to
be located on the same side.
The connectors, once screwed
together, are now ready to be
fastened to the roof.
Note: It is advantageous to
avoid connecting more than
two connectors. This simplifies
handling on the roof.
Choose the installation location,
rafters spacing, and distance
from the tiles for the mounting
angles and the position of the
connectors.
Flexible distances possible:
Vertical: approx. 1.1m to 1.4m
Horizontal: approx. 0.6m to 1.3m
Install a mounting angle at each
point where an connector cross-
es a rafter.
Mounting angle
Position of the connectors
I Installation Ia Roof-mounted installation on tiled roofs
Rafters for mounting angles

6
Remove tiles which cover the
rafters where the mounting an-
gles are to be installed.
It may be necessary to adjust
the mounting angles to the tile
height, and to insert a wooden
support beneath them.
Use the hacksaw and hammer
to remove a section of tile, so
that the mounting angle can lie
in a tile recess.
Put the mounting angle in place,
position the drill holes with the
wood screws, and pre-drill the
holes with a drill bit of approxi-
mately 5.5mm diameter.
The wood screws can be quickly
tightened with the socket span-
ner.
Mounting angle screwed firmly
in place, with additional wooden
support for correct tile height.
The mounting angles can also
be installed with a lateral offset.
The flexible mounting system
can also compensate for un-
favourable distances between
rafters.
6
7
8
9
10
11
12
13
14

7
Protruding tile edges must be
knocked off before replacing the
tiles.
Before mounting the connec-
tors, one T-head bolt is to be
inserted into each mounting an-
gle.
The connector which was
screwed together at the begin-
ning is to be screwed in place,
in line with the rows of tiles.
At the positions where the sec-
tions are connected, there is a
continuous groove. The groove
is interrupted by the connector
on the side closer to the tiles.
Note: It is advantageous for the
groove to be at the bottom, as
shown here. This reduces the
torque required for fastening
the collector.
Both connectors for two OWR
20 collectors are pre-assembled.
This means that the connectors
span unfavourable distances
between rafters, and allow dif-
ferent distances from the edge.
Flexible connector support
15
16
17
18
19
Eternit roof:
The same instruction steps as
shown in photos 1-5 apply for
roofs covered with eternit tiles or
ondulated eternit sheet.The holes
for the hanger bolts are to be
drilled and the angle plate is to be
adjusted to the appropriate
height.Then the connector is
mounted on top of it.

8
Lie the OWR 20 in a horizontal
position at a practical working
height.The collector hook set will
be needed during installation.
The two collector hooks at the
head of the collector are to be
precisely measured with the
metre rule.
Note: Both measurements must
be exact to the millimetre.
Each collector hook is to be fas-
tened with the two screws. Each
hook must be securely fastened
for load bearing.
A rope or carrying strap is to be
passed from the rear side of the
collector, through the notches
above the collector hooks, and
back to the rear of the collector.
The collector hooks are to re-
main free on the rear side.Thus,
the rope is not pinched when
the collector is positioned on
the connector.
This method also ensures that
the tubes are not subjected to
pressure.
The collector is then to be slid
along the connector until the
collector hook is flush with the
edge. The T-head bolt is then to
be tightened.
At the lower end of the collec-
tor, two further clamps are to
be attached on both sides and
screwed tight.
The central expansion joint is to
be screwed onto the collector
which is already fixed in place.
The second OWR 20 collector
is to be placed nearby the first
collector.
The second OWR 20 collector
is to be brought to the right
distance for the expansion joint
and the expansion joint screwed
tight (torque max. 15 Nm).
20
21
22
23
24
25
26
27
28
Warning!
Please observe the hydraulic
connection variants on page
16. In the following steps, the
installation of expansion joints
is described for the case where
the unit is connected accord-
ing to the Tichelmann principle
(see page 16, diagram A or B).
The collectors can also be con-
nected conventionally on one
side (see page 16, diagram C)
or conventionally on alternating
sides from the left or from the
right (see page 16, diagram D).
Only the lower connections are
required here (see page 16).
We recommend connection ac-
cording to the Tichelmann prin-
ciple (see page 16, diagram A
or B).

9
Slight tilting makes it easier
to attach the expansion joints,
whereupon the seal must not
become damaged.
All three expansion joints are
to be installed in a voltage-free
state.
Only now is the T-head bolt on
the collector hook to be screwed
tight. At the lower end of the
collector, the clamps are now to
be pushed in and tightened.
At the collector array end, the U-
bend is to be screwed in place.
This connects the upper pipe
with the central pipe (torque
max. 15 Nm).
The blind cover is also to be
screwed in place. (torque max.
15 Nm)
The sensor is to be inserted on
the collector's input and output
side. This requires piercing the
rubber plug, for example with a
5mm drill bit.
The rubber plug is to be com-
pletely pulled out, in order to
make sure that the sensor is
inserted into the sensor well.
The sensor is then to be inserted
together with the plug.
The sensor is to be pushed into
the collector up to the stop, i.e.
approximately 19 cm. This is the
correct position for precise tem-
perature recording.
31
32
33
34
35
36
37
38
39
40
Some pressure must be applied
to insert the other expansion
joints.
All expansion joints must be
tightened at both ends diametri-
cally opposed in order to pre-
vent excessive tightening on one
side! (torque max. 15 Nm)
29
30
CCollector outlet /
hot
BCollector inlet /
cold
AInternal
return pipe /
collector inlet

10
Example: installation of 2 OWR 20 collectors
The installation materials in-
clude:
- 2 OWR 20 collectors
(incl. packaging material)
- 1 basic flat roof set
- 2 flat roof extension set
- 1 basic hydraulics set
- 2 hydraulics extension set
Flat roof extension set
Basic flat roof set
1
2
3
4
5
6
- 13mm socket spanner/open-ended spanner
- 30mm open-ended spanners (2 x)
- Ø 5.5mm wood drill bit
- hammer
- hacksaw
- folding ruler/metre rule
The two battens, as well as the
polystyrene sections at the bot-
tom of the collector's packag-
ing, are used as assembly aids.
One half of the basic set, and
one extension set are to be laid
out as shown here.
Note: The mounting frames are
not to be bolted tight to the
clamps at the base until the end
of the mounting procedure.
The polystyrene and the battens
are to be arranged as shown,
opposite the mounting frame
sections.
The OWR 12 collector is to be
laid onto the battens and poly-
styrene with the rear side facing
upwards.
Note: The tubes must lie in the
polystyrene recesses. The wood
and polystyrene prevent the
collector's aluminium and glass
from becoming damaged.
Note: The stand profiles for flat
roof mounting are designed for
mountings at up to 45°. Steeper
mountings with more than 45°
require additional mounting
materials (subject to a charge).
I Installation Ib Installation on flat roofs

11
Slide the slot nut for the base
section and for the extension
section into the collector frame.
The slot nut and the collector
frame join flush with one an-
other.The pivot bolt is not yet to
be fastened. Tighten the other
bolts.
Pivot bolt
Unfold the stand section, and
tighten the pivot bolt just
enough for the section to stand
by itself.
Remove the slot nut with a trian-
gle from the standing section.
Slide in the slot nut with a trian-
gle at the head of the collector.
Note: This fastening measure-
ment must later be repeated for
all collectors, exact to the mil-
limetre.
After measuring tighten the two
bolts.
Once both triangles have been
fastened at the head of the col-
lector, the collector is to be tilted
over the pivotal point.
7
8
9
10
11
12
13
Tighten the bolts at the head of
the collector.
Tighten the pivot bolts at the
lower end of the collector.
14
15

12
17
18
16
19
20
The final step is to fasten the
pivot bolts at the lower end of
the supports. The standing sup-
ports are pre-configured in the
factory for approximately 40°.
The collector can be mounted at
a more shallow angle by moving
the lower end inwards. Moving
the upper end inwards makes
the angle steeper. The supports
can also be cut to length in
order to achieve an even more
shallow angle.
The central connecting expan-
sion joint is to be screwed tight
on one side. Hydraulic connec-
tions: see page 18
Another support is to be di-
mensioned for installation of
the second collector. Follow the
same procedure as for the first
collector.
The central connecting expan-
sion joint is to be tightened us-
ing two spanners diametrically
opposed.
The other two expansion joints
are also to be installed. Dur-
ing insertion, it is necessary to
squeeze the expansion joints
together a little.
Screw the U-bend in place. With
the blind cover, all connections
are now sealed (torque max. 15
Nm).
The sensor is to be inserted on
the collector's input and output
side. Pierce the rubber plug, for
example with a 5mm drill bit.
The rubber plug is to be com-
pletely pulled out, in order to
make sure that the sensor is
inserted into the sensor well.
The sensor is then to be inserted
together with the plug.
21
22
23
24
Warning!
Please observe the hydraulic
connection variants on page 16.
In the following steps, the in-
stallation of expansion joints is
described for the case where
the unit is connected accord-
ing to the Tichelmann principle
(see page 16, diagram A or B).
The collectors can also be con-
nected conventionally on one
side (see page 16, diagram C)
or conventionally on alternating
sides from the left or from the
right (see page 16, diagram D).
Only the lower connections are
required here (see page 16).
We recommend connection ac-
cording to the Tichelmann prin-
ciple (see page 16, diagram A
or B).

13
The sensor is to be pushed into
the collector up to the stop, i.e.
approximately 19 cm. This is the
correct position for precise tem-
perature recording.
The blind cover is placed on
connection “B”. The cold water
supply to the collector is fed to
connection “A”; the hot water
return from the collector exits
at connection “C”. (Sensor has
been removed to improve clar-
ity.)
The two OWR 20 collectors have
now been mounted on their
mounting frames and hydrauli-
cally interconnected.
In the next step, the entire col-
lector array is to be fastened to
the base surface by means of
the clamping plates.
27
25
26
30
31
28
29
Begin with the base fastening
between the collectors. With
the supports extension set, the
clamping plate is to be slid in
until it reaches the slot nuts.
Important: Push the two alu-
minium sections together un-
til the plate is clamped in. This
guarantees the correct distance
between the sections.
Finally, the 4 clamping plates
(two at the front, and two at the
rear) for fastening the edges of
the collector array are bolted
tight. Each plate must also be
pushed in until it reaches the
slot nut.
CCollector outlet /
hot
BCollector inlet /
cold
AInternal
return pipe /
collector inlet

14
II Commissioning IIa System and dimensioning
South-facing roof
Collector array with two OWR
20 collectors, a pump group
and control unit. The roof fac-
es south, south-east, or south-
west.
Roof facing EAST/WEST
Collector array in two sections,
with 3-strand pump group and
control unit. Three main daily
operating situations:
In the morning – Eastern pump is
running, because the eastern col-
lector array section is producing
energy. Western pump is idle.
At midday – Both pumps are
running. Energy is being sup-
plied from eastern and western
collector array sections.
In the afternoon – Western pump
is running, because the western
collector array section is produc-
ing energy. Eastern pump is idle.
N.B.: Only one expansion ves-
sel is to be connected to the
3-strand pump group.
Legend
S1 Eastern collector sensor
S2 Western collector sensor
S3 Storage tank sensor
SSt Pump group (solar station)
EXT Expansion vessel
TMV 3-way thermomixer
Legend
S1 Collector sensor
S2 Storage tank sensor
SSt Pump group (solar station)
EXT Expansion vessel
TMV 3-way thermomixer

15
Suggested dimensions for OWR 20 (rough estimates)
Collector orientation & roof angle
Number of OWR 12
per collector field
Active absorber area
Volume flow
in the collector field
Pressure loss
in the collector field
Pipe materials
Pipe dimensions at a pipe length of:
Heat carrier liquid
Tyfocor LS / canister 20 ltr.
South 30°- 55°
SE / SW 30°- 55°
South <30°/>55°
SE / SW <30°/>55° Stk. m2l/min kPa up to 2 x
10.0m
up to 2 x 15.0m
up to 2 x 20.0m ca.
Number of persons for hot process water: 2-3 Pers. 300 ltr.
2-3 Pers. 300 ltr.
2-3 Pers. 300 ltr.
1 Pers. 200 ltr. 15.5 1.7 0.6 CU
SR
18x1.0 15x½"
18x1.0 15x½"
18x1.0 15x½" 3
5 Pers. 400 ltr.
5 Pers. 400 ltr.
5 Pers. 400 ltr.
2-4 Pers. 300 ltr. 210.9 3.4 1.3 CU
SR
18x1.0 15x½"
18x1.0 15x½"
18x1.0 15x½" 3
6 Pers. 500 ltr.
6 Pers. 500 ltr.
6 Pers. 500 ltr.
6 Pers. 400/500 ltr. 316.4 5.1 4.2 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
18x1.0 20x¾" 4
6-8 Pers. 750 ltr.
6-8 Pers. 750 ltr.
6-8 Pers. 750 ltr.
6 Pers. 500 ltr. 421.8 6.8 8.9 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
18x1.0 20x¾" 4
8 Pers. 750 ltr.
8 Pers. 750 ltr.
8 Pers. 750 ltr.
7 Pers. 750 ltr. 527.3 8.5 16.1 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
22x1.0 25x1" 5
10 Pers. 1000 ltr.
10 Pers. 1000 ltr.
10 Pers. 1000 ltr.
8 Pers. 750 ltr. 632.8 10.2 26.2 CU
SR
22x1.0 25x1"
22x1.0 25x1"
28x1.5 25x1" 5

16
Suggested dimensions for OWR 20 (rough estimates)
Collector orientation & roof angle
Number of OWR 12
per collector field
Active absorber area
Volume flow
in the collector field
Pressure loss
in the collector field
Pipe materials
Pipe dimensions at a pipe length of:
Heat carrier liquid
Tyfocor LS / canister 20 ltr.
South 30°- 55°
SE / SW 30°- 55°
South <30°/>55°
SE / SW <30°/>55° Stk. m2l/min kPa up to 2 x
10.0m
up to 2 x 15.0m
up to 2 x 20.0m ca.
Number of persons for hot process water: 2-3 Pers. 300 ltr.
2-3 Pers. 300 ltr.
2-3 Pers. 300 ltr.
1 Pers. 200 ltr. 15.5 1.7 0.6 CU
SR
18x1.0 15x½"
18x1.0 15x½"
18x1.0 15x½" 3
5 Pers. 400 ltr.
5 Pers. 400 ltr.
5 Pers. 400 ltr.
2-4 Pers. 300 ltr. 210.9 3.4 1.3 CU
SR
18x1.0 15x½"
18x1.0 15x½"
18x1.0 15x½" 3
6 Pers. 500 ltr.
6 Pers. 500 ltr.
6 Pers. 500 ltr.
6 Pers. 400/500 ltr. 316.4 5.1 4.2 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
18x1.0 20x¾" 4
6-8 Pers. 750 ltr.
6-8 Pers. 750 ltr.
6-8 Pers. 750 ltr.
6 Pers. 500 ltr. 421.8 6.8 8.9 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
18x1.0 20x¾" 4
8 Pers. 750 ltr.
8 Pers. 750 ltr.
8 Pers. 750 ltr.
7 Pers. 750 ltr. 527.3 8.5 16.1 CU
SR
18x1.0 20x¾"
18x1.0 20x¾"
22x1.0 25x1" 5
10 Pers. 1000 ltr.
10 Pers. 1000 ltr.
10 Pers. 1000 ltr.
8 Pers. 750 ltr. 632.8 10.2 26.2 CU
SR
22x1.0 25x1"
22x1.0 25x1"
28x1.5 25x1" 5
Fully integrated collector
hydraulics (fch)
The OWR 12 has fully integrated
1/2’’ collector hydraulics (fch),
with a third connection, includ-
ing sensor wells installed on
both sides. Hydraulic connec-
tion is freely selectable.
Conventional one-side and al-
ternating-side connections
With conventional connection,
the 3rd connection is closed
off with a wind-resistant plastic
cap. Two blind covers close off
the collector array. The connec-
tion can also be realised one-
sided (on the right-hand side or
on the left-hand side).
Tichelmann
With Tichelmann connection,
there is cold flow through the
internal return pipe. The blind
covers are applied to the first
and last collectors as shown.
Corresponding one-sided con-
nection on the right-hand side.
Large-scale systems(Tichelmann)
Large-scale systems, e.g. more
than 6 OWR 20 collectors in a
row, can be connected together
in the centre of the array for
quick, low-loss yields.
II Commissioning IIb Hydraulic connections
Do not fill the system in direct sunlight.
Danger of steam hammering!
Sensor
Attention!
We recommend connection
according to “A” and “B”.
The sensor is connected to the return side of the collector array.
(see pages 9 and 12/13)
CCollector outlet /
hot
BCollector inlet /
cold
AInternal
return pipe /
collector inlet
U-pipe from A to B
A
B
D
Volume flow:
OWR 20: 1,7 l/min
Volume flow:
OWR 20: 1,7 l/min
Volume flow:
OWR 20: 1,7 l/min
max. 2 x 6 OWR 20
max. 6 OWR 20
max. 8 OWR 20
C
not possible
U-bend
Blind cover
(3/4” brass)
Expansion joint
Plastic caps

17
Vessel selection according to
SKWI 93-1
It must be possible for the ex-
pansion vessel to take in at least
the calculated volume V
nom
(given in litres).
The typical intake volumes of
the individual tank sizes can be
read directly from table 2 and
thus the suitable tank can be de-
termined. When making the se-
lection, it must be ensured that
the system's values for Hp and
Pact respectively are within the
threshold values in the table.
Other threshold values are pos-
sible. Generally, Boyle-Mari-
otte's gas law applies. This is
based on the premise that the
product of volume and pressure
in the pressure tank is to remain
constant in all operational situa-
tions. As Pneumatex tanks have
no volume-restricting fittings,
the gas law can be applied for
the tank, in the form Vs ∙ Pt =
Ve ∙ Pefor all special cases, un-
til the maximum construction
pressure (Pcons = 6 bar) has
been reached. Here, the follow-
ing applies:
Vs = system volume of the tankwhen
empty on the water side.
Ptank = pre charge pressure at the
tank (P absolute value).
Ve = final volume of air content, i.e.
difference between total tank vol-
ume and water volume taken in.
Pe = final pressure in tank, which aris-
es if the volume Ve is reached (P
absolute value).
In all cases, the applicable official
regulations must be adhered to!
Expansion vessel calculation
Calculation
For correct dimensioning of an
expansion vessel, the following
system data must be known:
- Total system content V
S, (i.e. the
sum of the content of any stor-
age tanks, pipes, radiators, etc.
in the solar system).
- Maximum supply tempera-
ture tsupply for the heating
system's dimensioning condi-
tions.
- System's static height Hp, i.e.
height from the centre of the
tank to the system's highest
bleed point (cf. fig.).
For systems with a maximum
supply temperature above boil-
ing point at atmospheric pres-
sure, the saturation pressure
at the relevant system compo-
nent is to be taken into account
as well as the static height.
- Construction pressure Pcons
of the most important system
components, which must be
greater than or equal to the
safety valve's activation pres-
sure Pact whereby any static
height differences must be
taken into account.
- Expansion volume V
nom
This is to be calculated accord-
ing to the formula:
V
nom =V S∙F∙x (litres).
VS = total system content in litres
when cold
F = thermal expansion factor
according to tavg (see tab. 1)
x = safety margin factor
x = 3; up to 30kW nominal
power
x = 2; 30 to 150kW
nominal power
x = 1.5; over 150kW
nominal power
Example calculation: page 20/21
!
II Commissioning IIc Expansion vessel
Intrinsically safe system, see also next page
Thermal expansion factor F
tavg= 30°C 40°C 50 °C 60°C 70°C 80°C 90 °C 100°C 110°C
F = 0.004 0.008 0.012 0.017 0.022 0.029 0.035 0.043 0.051
Assumed filling temperature 10°C = t1
Tsupply =supply temperature °C
Treturn =return temperature °C
tavg = average water temperature in the system =
tsupply +
treturn
2
min. required pre charge pressure in tank = Hp + 0.5 bar
min. required activation pressure SV Pact = Pwork + A - B
normal working pressure (Pwork) = Pact
1.3
EXT = expansion vessel
SV1 = safety valve

18
The dimensioning of the expan-
sion vessel in the collector cir-
cuit must be such that, even af-
ter an interruption to the power
supply of the circulation pump
in the collector circuit during
the time of maximum solar irra-
diation intensity, operation can
be automatically resumed once
the power supply is restored,
and once the liquid in the collec-
tor has condensed again.
If the heat transfer medium can
vaporise in conditions of stagna-
tion, the expansion vessel must
be installed in such a manner
that upon stagnation, fluid is
forced out of the collector, but
no steam.
Note
If it is possible for the heat trans-
fer medium to vaporise in condi-
tions of stagnation, this entails a
specific dimensioning rule!
In addition to the usual dimen-
sioning for closed space-heat-
ing systems (expansion of the
entire heat transfer medium),
the expansion vessel must be
able to compensate for a vol-
ume which corresponds to the
total volume of the heat transfer
medium in the collector group
and all connecting pipes be-
tween the collectors, plus an
additional 10%.
It must be ensured that damage
to the expansion vessel cannot
Intrinsically safe solar system
be caused by the hot heat trans-
fer medium. In particular, the
daily temperature cycle which
arises during normal system
operation must not cause the
hot heat transfer medium to
reach the expansion vessel.
The expansion vessel must be
installed in the cold section of
the collector circuit, i.e. in the
part of the collector circuit where
the heat transfer fluid flows from
the storage tank to the collector.
In cases of doubt, it is neces-
sary to install a suitable cooling
line, e.g. coiled pipe or cooling
vessel, in front of the expansion
vessel.
Automatic bleed valves
We do not recommend automatic bleed valves! If, however, there is
no alternative, automatic bleed valves must always be installed verti-
cally. It is only permissible to install automatic bleed valves or similar
systems if a tight-sealing manual shut-off valve (e.g. ball valve) is
situated immediately ahead of each one.
After automatic bleeding of the system, the tight-sealing shut-off
valve must be closed manually, and remain closed. Only fittings
which are suitably temperature-resistant and pressure-resistant may
be installed, see p. 20, 6 bar.
!
The expansion vessel con only
be connected to the AMK col-
lectra ag pumps group, if it is a
tank with an integrated smooth
bore heat exchanger, chiefly a
hot water generator. When fill-
ing the tank through a plate
heat exchanger, a tank for cool-
ing off must be installed before
the expansion vessel.
In solar circuits with more than
one reservoir tank the expan-
sion vessel connection must al-
ways be made to the reservoir
tank with the lowest medium
Connecting the expansion vessel
temperature. The connection is
to be made at the outlet side
of the smooth bore heat ex-
changer (return flow solar-side),
although before any motor
switching valves, motor globe
valves or pumps groups (in flow
direction).
Solar systems with AMK col-
lectra ag vacuum tube collec-
tors must be completely bled.
At the upper connection to a
plate heat exchanger a heat-re-
sistant manual deaerator must
be installed. Depending on the
type of connection to the cool-
ing-off tank for the expansion
vessel a deaerator may need to
Bleeding
be installed there also. Manual
deaerators should be included
directly at the connection of the
smooth bore heat exchanger to
the reservoir tank.

19
Pressures and water intake Pre charge pressure of empty tank = static height in mwc (metres water column) + 0.5 bar Operating pressure = system fill (cold = tm max. 45°C) = pre charge pressure + 0,2 bar The values given in the table are the number of litres until which a pressure of 3.0 bar is reached. Water intake in litres / 6 bar safety valve The capacities of other brands may differ from those in this table (Pneumatex expansion vessels)!
Pre charge pressure in tank (bar) 1 1.1 1. 2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
Static height (mwc) ≤5 678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SD = wall-mounted tanks SD 8 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1. 8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
SD 12 6.0 5.6 5.4 5.0 4.8 4.4 4.2 3.8 3.6 3.2 3.0 2.6 2.4 2.0 1. 8 1.4 1.2 0.9 0.6 0.3
SD 18 9.0 8.5 8.1 7. 6 7. 2 6.7 6.3 5.8 5.4 4.9 4.5 4.0 3.6 3.1 2.7 2.2 1. 8 1.4 0.9 0.5
SD 25 12.5 11. 8 11. 3 10.5 10.0 9.3 8.8 8.0 7. 5 6.8 6.3 5.5 5.0 4.3 3.8 3.0 2.5 1.9 1. 3 0.6
SD 35 1 7. 5 16.5 15.8 14.7 14.0 13.0 12.3 11. 2 10.5 9.5 8.8 7. 7 7. 0 6.0 5.3 4.2 3.5 2.6 1.8 0.9
SD 50 25.0 23.5 22.5 21.0 20.0 18.5 1 7. 5 16.0 15.0 13.5 12.5 11. 0 10.0 8.5 7. 5 6.0 5.0 3.8 2.5 1.3
SD 80 40.0 37.6 36.0 33.6 32.0 29.6 28.0 25.6 24.0 21.6 20.0 1 7. 6 16.0 13.6 12.0 9.6 8.0 6.0 4.0 2.0
SU = standing tanks SU 140 70.0 65.8 63.0 58.8 56.0 51.8 49.0 44.8 42.0 37.8 35.0 30.8 28.0 23.8 21.0 16.8 14.0 10.5 7. 0 3.5
SU 200 100.0 94.0 90.0 84.0 80.0 74.0 70.0 64.0 60.0 54.0 50.0 44.0 40.0 34.0 30.0 24.0 20.0 15.0 10.0 5.0
SU 300 150.0 141.0 135.0 126.0 120.0 111. 0 105.0 96.0 90.0 81.0 75.0 66.0 60.0 51.0 45.0 36.0 30.0 22.5 15.0 7. 5
SU 400 200.0 188.0 180.0 168.0 160.0 148.0 140.0 128.0 120.0 108.0 100.0 88.0 80.0 68.0 60.0 48.0 40.0 30.0 20.0 10.0
SU 500 250.0 235.0 225.0 210.0 200.0 185.0 175.0 160.0 150.0 135.0 125.0 110.0 100.0 85.0 75.0 60.0 50.0 37.5 25.0 12.5
SU 600 300.0 282.0 270.0 252.0 240.0 222.0 210.0 192.0 180.0 162.0 150.0 132.0 120.0 102.0 90.0 72.0 60.0 45.0 30.0 15.0
SU 800 400.0 376.0 360.0 336.0 320.0 296.0 280.0 256.0 240.0 216.0 200.0 176.0 160.0 136.0 120.0 96.0 80.0 60.0 40.0 20.0
Example 1: selecting the correct tank volume A system with a static height of 9.0mwc (metres water column) and a water expansion volume of 12 litres = SD 35. Example 2: setting the correct pressures (pre charge pressure and system operating pressure) A system with a static height of 9.0mwc => 1.4 bar pre charge pressure => 1.6 bar system operating pressure when system is cold.