Vaillant auroSTEP plus VIH SN 350/3 MiP Operating and installation instructions

For the heating engineer
System Description, Installation and Maintenance Manual
auroSTEP plus
System for solar powered hot water generation VIH SN 350/3 MiP
VIH SN 350/3 iP
VEH SN 350/3 iP
VEH SN 350/3 iP-c
DE(EN)

1
For the heating engineer
System description
auroSTEP plus
System description auroSTEP plus 0020077748_FT1
Contents
1 Notes on the documentation.........................2
1.1 Storage of the documents....................................2
1.2 Symbols used...........................................................2
1.3 Applicability of the manual...................................2
2 System description ........................................2
2.1 Scope of delivery and accessories....................2
2.2 Cylinder unit.............................................................5
2.3 Construction and function....................................5

2System description auroSTEP plus 0020077748_FT1
1 Notes on the documentation
The following notes are intended to help you throughout
the entire documentation.
Further documents apply in connection with this system
and installation manual.
We accept no liability for any damage caused by fail-
ure to observe these instructions.
Other applicable documents
For the owner of the system:
– Operating manual No. 0020054748
For the heating engineer
– Installation manual for the auroTHERM classic
VFK 135 D flat solar collector
On-roof / flat roof mounting No. 0020057143
In-roof mounting No. 0020057148
1.1 Storage of the documents
Pass this system and installation manual and all other
valid documents on to the owner of the installation. He
will then store it so that it is available whenever it is re-
quired.
1.2 Symbols used
When operating the equipment, observe the safety in-
structions in this manual and in the operating manual!
dDanger!
Immediate risk of serious injury or death!
eDanger!
Danger of death by electric shock!
HDanger!
Danger of burning and scalding!
aCaution!
Potentially dangerous situation for the product
and the environment!
hNote!
Useful information and instructions.
• Symbol indicating a required action.
1.3 Applicability of the manual
This system description applies exclusively to units with
the following part numbers:
Appliance type Part number
VIH SN 350/3 MiP 0010007383
VIH SN 350/3 iP 0010007381
VEH SN 350/3 iP 0010007385
VEH SN 350/3 iP-c 0010007387
Table 1.1 Applicability of the manual
The article number of the unit can be found on the iden-
tification plate.
2 System description
This system description is intended for the heating engi-
neer.
It contains information about the system and is thus in-
tended to supplement the installation manual. The sys-
tem description is located at the start of the complete
manual.
2.1 Scope of delivery and accessories
The item numbers in the following Tables 2.1 to 2.5 refer
to Figure 2.1.
Item Material list Qty.
2-in-1 solar copper pipe, 10 m long
6 Butt splice 2
7 Elbow compression coupling 2
8 Bracket for solar copper pipe 6
9 Support bushing 6
10 2-in-1 solar copper pipe, 10 m long 1
Part No. 302359
2-in-1 solar copper pipe, 20 m long
6 Butt splice 2
7 Elbow compression coupling 2
8 Bracket for solar copper pipe 6
9 Support bushing 6
10 2-in-1 solar copper pipe, 20 m long 1
Part No. 302360
8 Bracket for solar copper pipe 4
Part No. 302364
Table 2.1 Accessory, 2-in-1 solar copper pipe
Item Material list Qty.
11 Single tube insulation, bird-safe, 0.75m long 2
Part No. 302361
12 Solar drain-back reservoir
Part No. 302362
Table 2.2 Other accessories
1 Notes on the documentation
2 System description

3System description auroSTEP plus 0020077748_FT1
10
9
8
11
3
47
1
6
5
13 14
15
16
19
17
18
20
21
23
25
22
24
26
27
28
29
30
31
32
33
2
12
Fig. 2.1 Scope of delivery and accessories for the auroSTEP
system
Key:
Scope of delivery:
1 Collector - auroTHERM classic VFK 135 D (2 ea.)
2 Single tube insulation, bird-safe, 0.75m long
3 Collector sensor
4 C1/C2 connection line
5 Cylinder unit
2-in-1 solar copper pipe (accessory):
6 Butt splice
7 Elbow compression coupling
8 Bracket for solar copper pipe
9 Support bushing
10 2-in-1 solar copper pipe, 10 m long
10 2-in-1 solar copper pipe, 20 m long
Other accessories:
11 Single tube insulation, bird-safe, 0.75 m long
12 Solar drain-back reservoir
Accessories for flat roof installation:
13 Frame
14 Mounting rail
15 Gravel tray
16 Securing clip for gravel tray
Accessories for on-roof mounting:
17 Mounting rail
18 Rafter anchor type P for Frankfurt pantiles
19 Rafter anchor type S for plain tiles or slates
20 Hanger bolt mounting kit
Anchor, M12x280 hanger bolt with three nuts, EDM sealing ring
and washer
Accessories for in-roof mounting:
21 Ridge plate connector - top/bottom
22 Side section - right/left
23 Clamp inner/outer
24 Front section - right/left
25 End cap
26 Roof batten
27 Support board
28 Bolt kits
29 Retaining strip
30 Horizontal intermediate plate
31 Spacer
32 Ridge plate - right/left
33 Tile support
System description 2

4System description auroSTEP plus 0020077748_FT1
Item Description Qty.(kit) Part number (kit) No. of kits (system)
13 Frame with clamping element 2 0020059885 1
14 Mounting rail (2 ea./collector) 2 0020059900 2
15 Gravel tray (optional) 3
0020059905 (3 ea.) 2
16 Safety clamps 2
Table 2.3 System material list for flat roof installation
Item Description Qty.(kit) Part number (kit) No. of kits (system)
17 Mounting rail (2 ea./collector) 2 0020059898 2
18 Roof anchor type P (for Frankfurter pantile) Anchor basic kit (for 1st collector)
Anchor upgrade kit (for 2nd collector) 4 20020067273 0020067276 1 1
19 Roof anchor type S (for beaver tail, etc.) Anchor basic kit (for 1st collector)
Anchor upgrade kit (for 2nd collector) 4 20020067275 0020067276 1 1
20 Hanger bolt mounting kit 4 0020067277 2
Table 2.4 System material list for on-roof installation
Basic kit1) (2 collectors)
Item Description Qty. Kit no.
21 Ridge plate connector - top/bottom -
0020059906
22 Side section - right/left -
23 Clamp inner/outer 12
24 Front section - right/left -
25 Profile end -
26 Roof batten 8
27 Support board -
28
Bolt kit (Nos. 1-5)
Bolt no. 1 7
Bolt no. 2 7
Bolt no. 3 6
Bolt no. 4 8
Bolt no. 5 -
29 Retainer strip 2
30 Horizontal intermediate plate 1
31 Spacer 2
32 Ridge plate - right/left -
33 Tile support -
1) basic kit for 1 collector is also mandatory
Table 2.5 System material list for in-roof installation
2 System description

5System description auroSTEP plus 0020077748_FT1
2.2 Cylinder unit
The auroSTEP plus solar energy system is used for solar
assisted hot water generation. Most of the components
of the compact solar energy system are integrated into
the domestic hot water cylinder unit. The system has a
built-in controller for post heating according to demand
using Vaillant boilers.
The Vaillant VIH SN 350i cylinder units are indirectly
heated solar cylinders supported by solar energy for
supplying hot water.
The cylinders and the pipe coils are enamelled on the
DHW side to ensure long service lives. Each tank has a
magnesium protection anode as a means of corrosion
protection. These protection anodes should be serviced
annually to ensure lasting corrosion protection. The
CFC-free EPS insulation provides the best thermal insu-
lation.
The indirectly heated solar cylinders operate in a closed
system, i. e. the water has no contact with the atmos-
phere. The hot water is pressed out of the cylinder by
the inflowing cold water if a hot water valve is opened.
The solar heat exchanger is located in the lower, cold
area. The relatively low water temperatures in the bot-
tom area ensure optimum heat transfer from the solar
circuit to the storage water even if there is only a low
level of solar radiation.
In the VIH SN 350/3 iP, additional post-heating takes
place when necessary in a second, separate heating cir-
cuit.
Furthermore, an electric heating element (accessory)
can be fitted in the VIH SN 350/3 MiP and VIH SN 350/3
iP solar cylinders to assist the post-heating, so that no
post-heating by means of the boiler is required in sum-
mer operation.
Apart from solar heating, post-heating of the hot water
is effected by means of the boiler or circulating water
heater or by the electric heating element in the upper,
warmer area of the cylinder. The pre-heated volume for
the post-heating is approx. 95l.
The solar cylinder is equipped with a circulation pump
for optimum adjustment to the required circulating vol-
ume and the pump output.
The regulation of the nominal flow rate is effected by
means of the controller and does not need to be set
manually.
2.3 Construction and function
The Vaillant auroSTEP plus solar energy system is a
thermal solar energy system for generating hot water.
When the system is at a standstill, the solar fluid runs
from the collectors and the lines back into the solar cyl-
inder. In this way, damage to the system from frost or
overheating is prevented. The use of a water/glycol mix-
ture as the solar fluid ensures additional frost protec-
tion.
4
2
11
13
9
8
5
6
10
12
16
15
17
A
B
C
14
1
3
18
7
Fig. 2.2 Main components of the auroSTEP system with VIH
SN 350i cylinder (diagram showing principle of opera-
tion without connection accessories)
Key
1 Solar flow pipe
2 Cold water pipe
3 Control system
4 Boiler
5 Hot water pipe
6 Upper cylinder sensor
7 Heating heat exchanger
8 Solar heat exchanger
9 Lower cylinder sensor
10 Built-in solar piping
11 Safety valve
12 Lower filling and drainage tap
13 Collector pump 1
14 Upper filling and drainage tap
15 Collector pump 2
16 Solar return pipe
17 Flat collectors
18 Collector sensor
System description 2

6System description auroSTEP plus 0020077748_FT1
The system consists of three main components:
A: two or three collectors,
B: the insulated piping and
C: a solar cylinder with integrated pump and control
system.
Collectors A
The collectors are auroTHERM VFK 135 D flat collectors
(17) with serpentine absorbers. A sensor fixed in the col-
lector (18) measures the collector temperature.
Piping B
The system piping consists of the flow (1) and return
(16) lines. Inside the house the lines are installed side-
by-side in an insulating jacket, which also encloses the
line for the collector sensor (18). This assembly is also
known as the "2 in 1 solar copper pipe". To make the
connection on the roof, the copper pipes have their in-
sulation removed and are cut to the appropriate length,
lagged individually and then fixed to the collector using
compression couplings.
hNote!
As the pipelines are dimensioned in accordance
with DIN 1988, use only copper piping with an
internal diameter of 8.4mm for piping the
system.
Vaillant recommends the easy to install "2 in 1
solar copper pipe", available as an accessory in
10m lengths (Part No. 302359) or in 20m
lengths (Part No. 302360), with which the
system operates optimally and reliably.
In addition, comply with the Energy
Conservation Regulation (EnEV) and the DVGW
working sheet W551.
Solar cylinder C
The VIH SN 350/3 iP, VIH SN 350/3 MiP, VEH SN 350/3
iP and VEH SN 350/3 iP-c cylinders have a filling volume
of 350 l.
The solar heat exchanger (8) is located in the lower sec-
tion of the cylinder. This heat exchanger is connected to
the collector circuit. The heating heat exchanger (7) in
the upper section is used for post-heating by means of a
connected boiler (5), if the solar radiation is insufficient.
The two cylinder sensors (6) and (9) report the respec-
tive measured temperatures to the control system (3),
which is integrated into the cylinder. Other components
integrated into the cylinder unit are the collector pumps
(13) and (15), which enable the solar fluid to circulate
through the solar circuit, an expansion relief valve (11)
and two fill/drain taps (12) and (14). The cylinder itself
stores domestic hot water, which flows in through the
cold water pipe (2) and flows out again, heated, through
the hot water pipe (5).
2 System description

For the heating engineer
Installation and maintenance instructions
auroSTEP plus
Installation and maintenance instructions auroSTEP plus 0020077748_FT1 1
1 Notes on the documentation.........................2
1.1 Storage of the documents....................................2
1.2 Symbols used...........................................................2
1.3 Applicability of the manual...................................2
2 System description ........................................2
2.1 Identification plate..................................................2
2.2 CE mark .....................................................................2
2.3 Intended use.............................................................2
3 Safety instructions and regulations ............ 3
3.1 Safety instructions .................................................3
3.1.1 Solar cylinder unit...................................................3
3.1.2 Safety data sheet for solar fluid.........................4
3.2 Regulations...............................................................6
3.2.1 Overview of EU standards ....................................6
3.2.2 Regulations for Germany......................................7
4 Assembly .........................................................8
4.1 Installation location................................................8
4.2 Dimensions................................................................8
4.2.1 Toppling dimensions ..............................................8
4.3 Appliance and connection dimensions ..............9
4.3.1 Installing the collectors .........................................9
4.4 Transport to the installation location.............. 10
4.4.1 Transport in the packaging ................................ 10
4.4.2 Transport without packaging............................. 10
4.4.3 Transport without casing.................................... 10
4.4.4 Transport without insulation ...............................11
4.4.5 Fitting the insulation and the casing ................12
5 Installation..................................................... 12
5.1 Fitting the DHW supply lines...............................12
5.2 Fitting the solar connections ..............................12
5.3 Electrical installation............................................ 14
5.3.1 Regulations............................................................. 14
5.3.2 Electrical connection............................................ 14
6 Start-up...........................................................17
6.1 Filling the DHW system.........................................17
6.2 Filling and bleeding the post-heating
system.......................................................................17
6.3 Setting system parameters................................ 18
6.4 Equalising the pressure in the solar
heating system ..................................................... 20
6.5 Checking the solar heating system
for leaks....................................................................21
6.6 Setting the system parameters on the
controller..................................................................21
6.7 Setting the DHW thermostatic mixing valve...21
6.8 Handing over to the owner..................................21
8 Maintenance ................................................. 24
8.1 Cleaning the internal tank ................................. 24
8.2 Servicing the magnesium protection anode. 25
8.3 Checking the expansion relief valve ............... 26
8.4 Changing the solar fluid..................................... 26
8.5 Collectors ................................................................27
8.6 Replacement parts................................................27
8.7 Recommended maintenance checklist............27
10 Recycling and disposal................................ 29
10.1 Unit .......................................................................... 29
10.2 Solar collectors..................................................... 29
10.3 Solar fluid............................................................... 29
10.4 Packaging............................................................... 29
11 Customer service and guarantee............... 29
11.1 Vaillant customer service .................................. 29
11.2 Manufacturer's guarantee................................. 29
12 Technical data.............................................. 30
12.1 Cylinder unit VIH SN 350i.................................. 30
12.2 Sensor characteristics..........................................31
12.3 Flat collector VFK 135 D.......................................31
Contents

2Installation and maintenance instructions auroSTEP plus 0020077748_FT1
1 Notes on the documentation
The following notes are intended to help you throughout
the entire documentation.
Further documents apply in connection with this system
and installation manual.
We accept no liability for any damage caused by fail-
ure to observe these instructions.
Other applicable documents
For the owner of the system:
– Operating manual No. 0020054748
For the heating engineer
– Installation manual for the auroTHERM classic
VFK 135 D flat solar collector
On-roof / flat roof mounting No. 0020057143
In-roof mounting No. 0020057148
When operating the auroSTEP plus solar energy system,
please observe all operating manuals for the compo-
nents and assemblies of the system. These operating
manuals are enclosed with the relevant system parts
and additional components.
1.1 Storage of the documents
Pass this system and installation manual and all other
valid documents on to the owner of the installation. He
will then store it so that it is available whenever it is re-
quired.
1.2 Symbols used
Observe the safety instructions in this installation man-
ual when installing the device!
dDanger!
Immediate risk of serious injury or death!
eDanger!
Danger of death by electric shock!
HDanger!
Danger of burning and scalding!
aCaution!
Potentially dangerous situation for the product
and the environment!
hNote!
Useful information and instructions.
• Symbol indicating a required action.
1.3 Applicability of the manual
These operating manual applies exclusively to equip-
ment with the following part numbers:
Appliance type Part number
VIH SN 350/3 MiP 0010007383
VIH SN 350/3 iP 0010007381
VEH SN 350/3 iP 0010007385
VEH SN 350/3 iP-c 0010007387
Table 1.1 Applicability of the manual
The article number of the unit can be found on the iden-
tification plate.
2 System description
2.1 Identification plate
The identification plates on the auroSTEP plus solar en-
ergy system are fitted to the collector and the cylinder
unit.
2.2 CE mark
The CE mark documents the fact that the appliances
satisfy the basic requirements of the directive regarding
electromagnetic compatibility (Directive 89/336/EWG of
the Council).
2.3 Intended use
The equipment types listed in Table 1.1 to which this
manual is applicable are used for the storage and provi-
sion, as well as the controlled distribution, of hot water
that has been generated with the assistance of solar
technology.
The Vaillant auroSTEP plus solar energy system is a
state-of-the-art appliance which has been constructed in
accordance with recognised safety regulations.
Nevertheless, there is still a risk of injury or death to the
user or others or of damage to the device and other
property in the event of improper use or use for which it
is not intended.
The components of the auroSTEP plus solar energy sys-
tem are not intended for use by persons (including chil-
dren) having limited physical, sensory or mental capaci-
ties or who have inadequate experience and/or knowl-
edge, unless they are supervised by a person responsi-
ble for their safety or have been given instructions by
him regarding the operation of the components of the
auroSTEP plus solar energy system.
Children must be supervised to ensure that they do not
play with the components of the auroSTEP plus solar
energy system.
1 Notes on the documentation
2 System description

3Installation and maintenance instructions auroSTEP plus 0020077748_FT1
The VIH SN 350/3 iP or VIH SN 350/3 MiP and
VEH SN 350/3 iP or VEH SN 350/3 iP-c solar cylinder
units can be used in combination with all Vaillant boilers
manufactured from 2000 onwards.
Any other use or use beyond that specified shall be con-
sidered as improper use. The manufacturer or supplier
will not be liable for any resulting damage. The user
alone bears the risk.
Intended use includes observance of the operating and
installation manuals and all other applicable documents,
as well as adherence to the maintenance and inspection
conditions.
aCaution!
Improper use of any kind is prohibited!
3 Safety instructions and regulations
3.1 Safety instructions
General
The entire solar system must always be installed and
operated in accordance with recognised technical stand-
ards. Make sure you adhere to the valid work protection
regulations, in particular when working on the roof.
Make absolutely sure you wear anti-fall devices whenev-
er there is a risk of falling. (We recommend the Vaillant
safety belt, Part No. 302066.) Observe the accident pre-
vention regulations of the trade associations.
Danger of burning
HDanger!
There is a risk of combustion on components
carrying solar fluid, such as collectors and solar
lines, as well as on hot water pipes!
These components attain very high
temperatures in solar mode. Only touch these
components if you have already checked the
temperature.
To avoid injuries on hot parts, the assembly and ex-
change of collectors or collector parts should be carried
out on a heavily overcast day. Alternatively this work
can be carried out in the morning or evening of sunny
days or with the collector covered.
Danger of overvoltage
Earth the solar circuit to provide equipotential bonding
and overvoltage protection. Fasten the earthing clamps
to the solar circuit pipes and connect the clamps to an
equipotential rail with 16 mm2copper cable.
Leaks
If there is leakage in the hot water pipe between the cyl-
inder and the draw-off point, first close the cold water
shut-off valve on the cylinder. Then rectify the leak.
3.1.1 Solar cylinder unit
Installation
The electrical installation must be performed by an ap-
proved qualified servicing company, which is responsible
for adhering to the existing standards and regulations.
We accept no liability for any damage caused by failure
to observe these instructions.
eDanger!
Risk of fatal electric shock from touching live
connections.
Before working on the appliance, switch off the
power supply and secure it against restart.
We only honour the manufacturer’s warranty if the in-
stallation is performed by an approved qualified servic-
ing company.
eDanger!
Danger of death by electric shock!
There is a danger of electric shock and of
damage to the appliance if it is not correctly
installed.
Expansion relief valve and blow-off line
The water volume is increased each time the hot water
is heated in the cylinder, therefore each cylinder must
be equipped with an expansion relief valve and a blow-
off line.
System description 2
Safety instructions and regulations 3

4Installation and maintenance instructions auroSTEP plus 0020077748_FT1
aCaution!
A sign should be attached close to the blow-off
line for the DHW safety valve in accordance
with DIN 1988 - TRWI, with the following word-
ing:
"For safety reasons, water escapes from the
blow-off line for the expansion relief valve dur-
ing the heating of the cylinder.
Do not block it."
HDanger!
The outlet temperature at the expansion relief
valve or on the blow-off line can be as high as
90°C.
The blow-off line must be led to a suitable drain
point where nobody can be put at risk.
There is a risk of scalding by touching these
components or the water escaping from them!
Inspection/maintenance and alterations
Inspection and maintenance work on and alterations to
the cylinder or controller, the water and power supply
lines and the blow-off line and expansion relief valve for
the storage water may only be carried out by a qualified
heating engineer.
3.1.2 Safety data sheet for solar fluid
1. Substance/Formulation and company name
1.1 Information on the product:
Brand name Vaillant Solar Fluid, ready mixed
1.2 Information on the supplier:
Vaillant GmbH
Berghauser Str. 40
42859 Remscheid,
Telephone [phone] - 0, Fax [phone],
Emergency information: your local poison informa-
tion centre (see directory assistance or telephone
directory).
2. Composition/Information on components
2.1 Chemical properties
Aqueous solution of 1,2 propylene glycol with corro-
sion inhibitors.
3. Possible risks
3.1 No particular risks known
4. First-aid measures
4.1 General information
Remove contaminated clothing.
4.2 After inhaling:
Discomfort after inhaling fumes/
aerosol: fresh air, help from a doctor.
4.3 After skin contact
Wash off with soap and water.
4.4 After contact with the eyes
Flush out thoroughly with the lids held open under
running water for at least 15 minutes.
4.5 After swallowing
Rinse out the mouth and drink plenty of water.
4.6 Information for the doctor
Symptomatic treatment (decontamination, vital
functions), no specific antidote known.
5. Firefighting measures
5.1 Appropriate extinguishing agents:
Water spray, dry powder, alcohol-resistant foam, car-
bon dioxide (CO2)
5.2 Particular hazards:
Fumes which are detrimental to health. Formation
of smoke/mist. The specified substances/substance
groups may be released in the event of a fire.
5.3 Special protective equipment:
Wear independent breathing apparatus.
5.4 Further details:
The hazard depends on the combustible substances
and the fire conditions. Contaminated fire water
must be disposed of according to local regulations.
6. Measures to be taken if substances are released
accidentally
6.1 Individual-related measures:
No particular measures required.
6.2 Environmental measures:
Contaminated water/ fire water may not be dis-
charged into watercourses without pre-treatment
(biological sewage plant).
6.3 Cleaning/Collection methods:
Contain the spilled material and cover it with large
amounts of sand, earth or other absorbent material,
then sweep it up vigorously to facilitate the absorp-
tion. Fill the mixture into containers or plastic bags
and take away for disposal.
Pump out the product in the event of large quanti-
ties. Take up small quantities with a suitable hygro-
scopic material. Then dispose of in accordance with
the regulations. Wash away splashes with plenty of
water; inform the local water authority in the event
of large quantities which could flow into the drains
or watercourses.
7. Handling and storage
7.1 Handling:
Good ventilation of the workplace, no other particu-
lar measures required.
7.2 Fire and explosion protection:
No exceptional measures required.
Cool any endangered containers with water.
7.3 Storage:
Close containers tightly and store them in dry plac-
es. Galvanised containers must not be used for stor-
age.
3 Safety instructions and regulations

5Installation and maintenance instructions auroSTEP plus 0020077748_FT1
8. Limitation of exposure and personal protective
equipment
8.1 Personal protective gear:
Breathing protection:
Breathing protection in the event of a release of va-
pours/aerosols
Hand protection:
chemical-resistant protective gloves (EN 374). Suita-
ble materials even in the event of prolonged, direct
contact (recommended: protection index 6, corre-
sponding to > 480 minutes permeation time accord-
ing to EN 374):
Fluoroelastomer (FKM) – 0.7 mm layer thickness.
Suitable materials for brief contact or splashes (rec-
ommended: at least protection index 2, correspond-
ing to > 30 minutes permeation time according to
EN 374):
Nitrile rubber (NBR) – 0.4 mm layer thickness.
Owing to the large variety of types, observe the
manufacturers' operating instructions.
Eye protection: Safety glasses with lateral protec-
tion (framed glasses) (EN 166)
8.2 General safety and hygiene measures:
The usual protective measures for dealing with
chemicals must be observed.
9. Physical and chemical properties
Form: fluid
Colour: violet
Odour: product specific
Ice flocculation point (ASTM D 1177):
approx. -40 °C (Part No. 0020054988)
Solidification temperature (DIN 51583):
approx. -28°C ( Part No. 302363, 302498)
approx. -54°C (Part No. 0020054988)
Boiling point: > 100 °C (ASTM D 1120)
Flash point: none
Lower explosive limit: 2.6 %Vol.
Upper explosive limit: 12.6 %Vol.
Ignition point: n/a
Vapour pressure (20°C): 20 mbar
Density (20°C) (DIN 51757):
approx. 1.030 g/cm3 (Part No. 302363, 302498)
approx. 1.039 g/cm3(Part No. 0020054988)
Solubility in water: completely soluble
Solvent solubility (qualitative): polar solvents: solu-
ble.
pH value (20°C): 9.0-10.5 (ASTM D 1287)
Viscosity, kinematic (20°C) (DIN 51562):
approx. 5.0 mm2/s (Part No. 302363, 302498)
approx. 7.0 mm2/s (Part No. 0020054988)
10. Stability and reactivity
10.1 Substances to be avoided:
Strong oxidants
10.2Dangerous reactions:
No dangerous reactions if the storage and handling
regulations/notes are observed
10.3Dangerous decomposition products:
No dangerous decomposition products if the storage
and handling regulations/notes are observed.
11. Toxicological information
11.1 LD50/oral/rat: > 2000 mg/kg
Primary skin irritation/rabbit: not irritating. (OECD
guideline 404)
Primary irritation to the mucous membranes/rabbit:
not irritating. (OECD guideline 405)
11.2 Additional notes:
The product has not been tested. The statement has
been deduced from the individual components.
12. Ecological information
12.1 Ecological toxicity:
Fish toxicity: LC50 leuciscus idus (96 h): >100 mg/l
Aquatic invertebrates: EC50 (48 h): > 100 mg/l
Aquatic plants EC50 (72 h): > 100 mg/l
Micro-organisms/ effect on activated sludge: DEVL2
> 1000 mg/l. No disturbances to the biodegrading
activity of the activated sludge are expected if dis-
charged appropriately in low concentrations in
adapted biological sewage plants.
12.2Assessment of aquatic toxicity:
The product has not been tested. The statement has
been deduced from the individual components.
12.3Persistence and degradability:
Details regarding elimination:
OECD 201 A test method (new version)
Analysis method: DOC reduction
Degree of elimination: > 70% (28 d)
Assessment: easily biodegradable.
13. Note on disposal
13.1 Disposal
The fluid must de disposed of at an appropriate
waste site or waste incineration plant, for example,
in compliance with local regulations. Contact the
local municipal sanitation office or the mobile envi-
ronmental service for quantities under 100 l.
13.2Uncleaned packaging:
Uncontaminated packings can be reused. Packaging
that cannot be cleaned must be disposed of in the
same way as the material.
14. Transport information:
VbF: not subject to the ordinance on combustible
fluids.
Mailing permitted. Not dangerous goods in terms of
the transport regulations. GGVE/RID: -, UN no.: -,
GGVS/ADR: -, IATA DGR: -, IMDG code: -, TA air: - .
Safety instructions and regulations 3

6Installation and maintenance instructions auroSTEP plus 0020077748_FT1
15. Regulations
15.1 Labelling in accordance with EC directives/national
regulations:
No labelling obligation
15.2Other regulations:
Water hazard class: (Appendix 4 of the VwVwS (Ger-
many), dated 17.05.1999): (1), mildly hazardous to
water.
16. Other details
Full text of the hazard symbols and R phrases if listed in
Chapter 3 under 'Hazardous Contents': Xi: Irritant. R36:
Irritates the eyes.
The safety data sheet is intended to provide essential
physical, safety-related, toxicological and ecological
data and give recommendations for safe handling or
safe storage, handling and safe transport of chemical
substances and formulations. No liability is assumed for
damage in connection with the usage of this information
or the usage, application, adaptation or processing of
the products described here. This does not apply as long
as we, our statutory agents or assistants are liable in
the event of intention or gross negligence. No liability is
assumed for indirect damage.
This information has been compiled to the best of our
knowledge and conscience according to our current
state of knowledge. No guarantee can be made for prod-
uct properties.
17. Status: Created on 01. 02. 2008
by: Vaillant GmbH.
3.2 Regulations
In particular, the relevant version of the following laws,
ordinances, technical regulations, standards and provi-
sions must be observed with regard to installation:
hNote!
The following list of standards is not claimed to
be complete.
3.2.1 Overview of EU standards
Solar energy system in general
PrEN ISO 9488
Thermal solar energy systems and their components,
terminology (ISO/DIS 9488; 1995)
EN 12975-1
Thermal solar energy systems and their components;
Collectors, Part 1: General requirements
EN 12975-2
Thermal solar energy systems and their components;
Collectors, Part 2: Test methods
EN 1991-2-3
Eurocode 1 – Basis of design and actions on structures,
Part 2–3: Actions on structures - Snow loads
EN 12976-1
Thermal solar energy systems and their components;
Factory made systems - Part 1: General requirements
EN 12976-2
Thermal solar energy systems and their components;
Factory made systems - Part 2: Test methods
ISO 9459-1: 1993
Solar heating – Domestic water heating systems – Part 1:
Performance rating procedure using indoor test meth-
ods
ISO/TR 10217
Solar energy – Water heating systems – Guide to materi-
al selection with regard to internal corrosion
Collectors and collector assembly
EN 1991-2-4
Eurocode 1 – Basis of design and actions on structures,
Part 2–4: Actions on structures - Wind loads
Cylinder and cylinder installation
Pressure equipment directive 97/23/EC
Directive of the European Parliament and Council from
29th May, 1997 for the approximation of the laws on
pressure equipment of the Member States
PrEN 12897
Water supply - specification for indirectly heated un-
vented (closed) domestic hot water cylinders
PrEN 806-1
Specifications for installations inside buildings convey-
ing water for human consumption - Part 1: General infor-
mation
PrEN 1717
Protection against pollution of potable water installa-
tions and general requirements of devices to prevent
pollution by backflow
EN 60335-2-21
Safety of household and similar electrical appliances;
Part 2: Particular requirements for storage water heat-
ers (domestic hot water cylinders and hot water boilers)
(IEC 335-2-21: 1989 and supplements 1; 1990 and 2; 1990,
modified)
3 Safety instructions and regulations

7Installation and maintenance instructions auroSTEP plus 0020077748_FT1
Lightning protection
ENV 61024-1
Protection of structures against lightning – Part 1: Gen-
eral principles (IEC 1024-1: 1990; modified)
3.2.2 Regulations for Germany
The following rules and standards apply in Germany in
addition to the applicable EU standards:
Solar energy system in general
Energy Conservation Regulation (EnEV)
Regulation regarding energy-conserving thermal insula-
tion and energy-conserving systems engineering in
buildings, February 2002
DIN EN 12976-1
Thermal solar energy systems and their components -
Factory made systems - Part 1: General requirements;
German version EN 12976-1:2000
DIN EN 12976-2
Thermal solar energy systems and their components -
Factory made systems - Part 2: Test methods; German
version prEN 12976-2:2000
Collectors and collector assembly
DIN EN 12975-1
Thermal solar energy systems and their components -
Collectors - Part 1: General requirements; German ver-
sion EN 12975-1:2000
DIN EN 12975-2
Thermal solar energy systems and their components -
Collectors - Part 2: Test methods (includes correction
AC:2002); German version EN 12975-2:2001 + AC:2002
DIN 1055, Part 4
Design loads for buildings; live loads; wind loads on
structures not susceptible to vibration
DIN 1055, Part 5
Design loads for buildings; live loads; snow load and ice
load.
DIN 18338
Roof covering and roof sealing work
DIN 18339
Plumbing work
DIN 18451
Scaffolding work
Cylinder and cylinder installation
Pressure equipment directive 97/23/EC
Directive of the European Parliament and Council from
29th May, 1997 for the approximation of the laws on
pressure equipment of the Member States
Technical Regulations for Gas Installation
DVGW-TRGI 96 1996 edition, Wirtschafts- und
Verlagsgesellschaft Gas und Wasser m. b. H., Bonn
DVGW work sheet G 670 "Installation of gas fire places
in rooms with mechanical ventilators", Wirtschafts- und
Verlagsgesellschaft Gas und Wasser m.b.H., Bonn
DVGW work sheet W 551, July 2003, first draft "
Drinking water heating and piping systems; technical
measures to prevent the growth of Legionella; planning,
construction, operation and decontamination of drinking
water installations"
DIN EN 12828
"Heating systems in buildings"
DIN 1988
"Drinking water pipe installations on premises"
DIN 4753
"Water heating systems for drinking and service water"
Regulations of the water supply companies
Drinking water ordinance
Please note: The dimensioning of the pipes must be car-
ried out in accordance with DIN 1988. Furthermore,
comply with the energy Conservation Regulation (EnEV)
and the DVGW work sheet W551 in particular.
Controller and controller installation
Electrical connection
Lightning protection
VDE 0100
Installation of electrical equipment
VDE 0185
General information regarding the installation of light-
ning protection systems
VDE 0190
Main equipotential bonding of electrical installations
DIN 18382
Electrical cable and line systems in buildings
Safety instructions and regulations 3

8Installation and maintenance instructions auroSTEP plus 0020077748_FT1
4 Assembly
4.1 Installation location
Solar cylinder unit
• To prevent heat losses, please install the solar cylin-
der unit as close to the collector as possible; the mini-
mum distance to be observed is 3m.
• Take the weight of the full cylinder into account when
selecting the installation site (see Chapter 12 Techni-
cal data).
• The solar cylinder unit must be installed in a frost-pro-
tected room in accordance with DIN 4753.
• Choose the position of the cylinder unit so that the
lines (solar and drinking water) can be run as practica-
bly as possible.
• Choose the installation location of the cylinder unit so
that you have a space of approx. 35 cm above the cyl-
inder for replacing the used anode with a chain anode
(Part No. 106 482) in the event of an exchange.
hNote!
Insulate the heating pipes and hot water pipes
in accordance with the Energy-Saving Ordi-
nance (EnEV) to prevent energy losses.
aCaution!
The cylinder unit must be installed at a lower
height than the collectors and lines on the roof
to permit drainage of the collectors. The height
difference between the highest point (collector
supply line) and the lowest point of the system
(bottom of the cylinder) may not be more than
8.5 metres, as otherwise the pump would not
be powerful enough.
Caution!
The slope of the connecting lines between the
collector field and the solar cylinder unit may
not fall below 4 % (4 cm/m) at any point on
the lines, to ensure a sufficient flow rate of the
solar fluid.
Caution!
No more than 10m of the 10m long (Part No.
302 359) or the 20m long (Part No. 302 360)
"2 in 1 solar copper pipe" may be run horizon-
tally (while adhering to the 4% slope rule).
Horizontal in this case means a pipe run at an
angle of less than 45°!
hNote!
As with all equipment for generating and
providing hot water, noises also arise in this
solar energy system at a level which is
certainly in general below that of today's
conventional combustion boilers; however
installation in living rooms or bedrooms is
emphatically not advised!
4.2 Dimensions
4.2.1 Toppling dimensions
1775
1552
VIH 400
Fig. 4.1 Toppling dimensions
4 Assembly

9Installation and maintenance instructions auroSTEP plus 0020077748_FT1
4.3 Appliance and connection dimensions
80
150
55 55
150
317
731
Ø 605 1203
1692
85
1619
1
2
3
4
9
6
5
8
7
Fig. 4.2 Appliance and connection dimensions of the solar cyl-
inder unit
Key
1 Hot water connection R 3/4
2 Cylinder flow R 1
3 Cylinder return R 1
4 Cold water connection R 3/4
5 Connection schematic sticker
6 No function
7 Magnesium protection anode
8 Immersion tube for cylinder sensor Sp1
9 Drain valve
R = external thread
4.3.1 Installing the collectors
Install the collectors. Follow the installation manual for
the auroTHERM classic VFK 135 D flat collectors to do
this.
Assembly 4

10 Installation and maintenance instructions auroSTEP plus 0020077748_FT1
4.4 Transport to the installation location
The cylinder is delivered fully assembled.
You have various options for transport to the installa-
tion site.
– Complete in the packaging, if possible at the customer
side
– Without packaging, completely assembled, if the
transport route permits it
– Without casing or insulation, for narrow doorways or
to protect the casing
hNote!
To remove and refit the casing and insulation
takes 1 person approx. 10 minutes.
hNote!
The installation can optionally be carried out
with or without the insulation / casing.
hNote!
If necessary, use the transport aids from the
accessories.
aCaution!
Damage to the cylinder.
If the cylinder is brought to the installation
location on a trolley or carried there, pay
attention to the insulation on the base of the
cylinder. It must not be damaged.
4.4.1 Transport in the packaging
Fig. 4.3 Transport in the packaging, consisting of top and
bottom styrofoam pads and a cardboard sleeve carton
4.4.2 Transport without packaging
2
3
1
Fig. 4.4 Transport without packaging
• Remove the top pad and the cardboard sleeve carton.
• Pull the cylinder (1) on the bottom pad (3) over the
edge of the pallet until you can break off the bottom
pad at the intended point (2) with your foot.
• Position the hand cart in front of the pallet and load
the cylinder on to it.
4.4.3 Transport without casing
1
2
3
Fig. 4.5 Removing the top cap and covers
4 Assembly

11Installation and maintenance instructions auroSTEP plus 0020077748_FT1
• Remove the top cap (1) from the cylinder.
• Pull the two covers (2) and (3) off the front of the cyl-
inder.
1
Fig. 4.6 Releasing the casing jacket
• Unlock the fasteners (1) on the column and release
the casing jacket.
• Hold the casing jacket firmly and walk clockwise
around the cylinder with it, so that you are holding the
jacket in a tear shape in your hand.
• Clamp the two ends of the casing jacket together with
the enclosed clip.
Fig. 4.7 Fastening the casing jacket with the clip
4.4.4 Transport without insulation
Fig. 4.8 Removing the insulation
• First remove one half shell by pulling to the side, then
the other half shell.
• Now remove the cap.
Assembly 4

12 Installation and maintenance instructions auroSTEP plus 0020077748_FT1
4.4.5 Fitting the insulation and the casing
To fit the insulation and the casing, proceed in the re-
verse order:
• Fit the insulation from top to bottom - see Fig. 4.8.
• Fit the casing jacket by first hooking the holes in the
right hand side of the jacket into the column -
see Fig. 4.6.
• Then walk around the cylinder with the jacket and lock
the left hand side of the jacket with the fasteners.
hNote
Check that the covers are correctly seated, to
prevent heat loss.
• Align the cylinder vertically with the adjustable feet.
5 Installation
5.1 Fitting the DHW supply lines
To connect the DHW lines to the solar cylinder unit, Vail-
lant offers various piping sets as accessories for on-wall
or in-wall installation. Connection accessories, for exam-
ple, can be acquired for tolerance compensation both in
horizontal and vertical direction to ensure sufficient
flexibility during the installation if the appliance is con-
nected to a circulating water heater. Information re-
garding accessories can be found in the applicable price
list.
hNote!
Observe the manuals supplied with the
respective accessories for the installation of
the connection lines.
The piping to be installed on the customer side requires
the following components:
- DHW thermostatic mixing valve
– DHW expansion vessel, as required
– Pressure reducer in the cold water line, as required
– Non-return valve in the heating circuit, as required
– Service valves
– Legionella protection pump, as required
There is an accessory kit (Part No. 305 967) available
for the installation of pipes by the customer which con-
sists of four brackets.
These permit the connection of copper pipes (Ø 15mm)
by means of compression fittings.
DHW thermostatic mixing valve
The DHW thermostatic mixing valve allows the hot
water from the cylinder to be mixed with cold water to a
desired maximum temperature between 30 and 70° C.
If the DHW thermostatic mixing is set to the desired
maximum temperature during start-up, this maximum
temperature will be maintained at the hot water taps.
HDanger!
Set the thermostat mixer to below 60 °C and
check the temperature at a hot water tap to
ensure effective protection against scalding.
5.2 Fitting the solar connections
min. 4%
max. 8,5m
Fig. 5.1 Installation height and pipe slope without solar drain-
back reservoir
aCaution!
The total length of the connection lines be-
tween the collector and the solar cylinder unit
may not exceed 40 m, which means no more
than 20 m of 2 in 1 solar copper pipe (total
length 40 m) can be used.
Vaillant cannot guarantee the function of the
solar energy system if the entire length of the
connection pipes exceed 40 m or if the inner di-
ameter of the connection pipe is other than
8.4 mm.
Caution!
Vaillant can only guarantee the function of the
solar energy system if 2 in 1 solar copper pipe
of 10 m in length (Part No. 302359) or 20 m in
length (Part No. 302360) is used and the solar
energy system is filled with Vaillant solar fluid
(Part No. 302363,302498).
4 Assembly
5 Installation