Rotex SC 538/0/0 User manual

ROTEX 

Sanicube / HybridCube
Installation and maintenance
instructions
High-efficiency hot water storage tank
Types
SC 538/0/0
SC 538/16/0
SC 538/16/16
SCS 328/14/0-DB, SCS 328/14/0-P
SCS 538/16/0-DB, SCS 538/16/0-P
SCS 538/16/16-DB, SCS 538/16/16-P
HYC 343/0/0-DB
HYC 343/19/0-DB, HYC 343/19/0-P
HYC 544/19/0-DB, HYC 544/19/0-P
HYC 544/32/0-DB, HYC 544/32/0-P
GB
Output 02/2013
For certified companies

List of contents
2FA ROTEX SC / SCS / HYC - 02/2013
1 Guarantee and conformity . . . . . . . . . . . . . 3
1.1 Warranty conditions . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Observing instructions . . . . . . . . . . . . . . . . . . . . 4
2.2 Warning signs and explanation of symbols . . . . 4
2.3 Avoid danger . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.5 Instructions for operating safety . . . . . . . . . . . . . 5
2.5.1 Before working on the hot water storage tank 
and the heating system. . . . . . . . . . . . . . . . . . . . . .5
2.5.2 Electrical installation of optional accessories . . . . .5
2.5.3 Installation room . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.5.4 Requirements of the heating and filling water . . . . .5
2.5.5 Heating and sanitary side connection . . . . . . . . . . .5
2.5.6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.5.7 Instructing the user/owner. . . . . . . . . . . . . . . . . . . .5
2.5.8 Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3 Product description. . . . . . . . . . . . . . . . . . . 6
3.1 Design and components . . . . . . . . . . . . . . . . . . 6
3.1.1 High-efficiency hot water storage tank 
(Unpressurised system - drain-back) . . . . . . . . . . .7
3.1.2 High-efficiency hot water storage tank 
(Pressurised system) . . . . . . . . . . . . . . . . . . . . . . .9
3.2 Brief description . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1 Electric immersion heaters . . . . . . . . . . . . . . . . . .11
3.3.2 Non return valves . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3.3 Dirt filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3.4 Scalding protection . . . . . . . . . . . . . . . . . . . . . . . .12
3.3.5 Solar storage tank extension kit . . . . . . . . . . . . . .12
4 Set-up and installation . . . . . . . . . . . . . . . 13
4.1 Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.1 Important information . . . . . . . . . . . . . . . . . . . . . .13
4.1.2 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . .13
4.1.3 Installing the hot water storage tank . . . . . . . . . . .14
4.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.1 Important information . . . . . . . . . . . . . . . . . . . . . .15
4.2.2 Overview of connections . . . . . . . . . . . . . . . . . . . .15
4.2.3 Hydraulic connection. . . . . . . . . . . . . . . . . . . . . . .17
4.2.4 Connecting together several hot water storage 
tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2.5 Connection electric immersion heater / 
booster heater (accessories). . . . . . . . . . . . . . . . .18
4.2.6 Filling the hot water heat exchanger . . . . . . . . . . .20
4.2.7 Filling the storage tank . . . . . . . . . . . . . . . . . . . . .20
4.2.8 Filling solar panel circuit . . . . . . . . . . . . . . . . . . . .20
4.2.9 Filling the heating system and the storage tank 
charging circuit . . . . . . . . . . . . . . . . . . . . . . . . . . .20
5 Commissioning, decommissioning. . . . . 21
5.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Taking out of service . . . . . . . . . . . . . . . . . . . . 22
5.2.1 Temporary shutdown . . . . . . . . . . . . . . . . . . . . . .22
5.2.2 Final shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6 Hydraulic connection . . . . . . . . . . . . . . . . 24
6.1 Connection diagrams . . . . . . . . . . . . . . . . . . . . 24
6.1.1 HybridCube (HYC) . . . . . . . . . . . . . . . . . . . . . . . .24
6.1.2 Sanicube Solaris (SCS) . . . . . . . . . . . . . . . . . . . .25
6.1.3 Sanicube (SC). . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7 Operation and maintenance. . . . . . . . . . . .28
7.1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1.1 Storage tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1.2 Electric immersion heater EHS/500/1, 
EHS/500/5, EHS/500/6 (accessories) . . . . . . . . . 28
7.1.3 Booster Heater BO3s (accessories) . . . . . . . . . . 28
7.2 Service and maintenance . . . . . . . . . . . . . . . . 29
8 Technical data . . . . . . . . . . . . . . . . . . . . . . .30
8.1 Basic data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.1 Sanicube (SC) . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.2 Sanicube Solaris (SCS). . . . . . . . . . . . . . . . . . . . 31
8.1.3 HybridCube (HYC) . . . . . . . . . . . . . . . . . . . . . . . 32
8.2 Performance diagrams . . . . . . . . . . . . . . . . . . 34
8.2.1 Sanicube (SC) / Sanicube Solaris (SCS) . . . . . . 34
8.2.2 HybridCube (HYC) . . . . . . . . . . . . . . . . . . . . . . . 34
8.3 Tightening torque . . . . . . . . . . . . . . . . . . . . . . 35
9 List of keywords . . . . . . . . . . . . . . . . . . . . .36
10 Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

1xGuarantee and conformity
FA ROTEX SC / SCS / HYC - 02/2013 3
1 Guarantee and conformity
1.1 Warranty conditions
The legal guarantee conditions fundamentally apply. Our
warranty conditions beyond that can be found online on your
sales representative's webpage.

4FA ROTEX SC / SCS / HYC - 02/2013
2xSafety
2 Safety
2.1 Observing instructions
This instruction is the >> Original Version << in your language.
Please read this manual carefully and thoroughly before
proceeding with the installation or modification of the heating
system.
These instructions are intended for authorised and trained
heating and sanitation experts who have experience in the proper
installation and maintenance of heating systems and hot water
storage tanks by virtue of their technical training and knowledge.
This manual provides all the necessary information for instal-
lation, start-up and maintenance, as well as basic information on
operation and settings. Please go through the attached
documents for a detailed description of operation and control.
Relevant documents
– When connecting to an external heat generator; the associ-
ated installation and operating instructions.
– When connecting to a ROTEX solar system; the associated
installation and operating instructions.
The guides are included in the scope of supply for the individual
units.
2.2 Warning signs and explanation of symbols
Meaning of the warnings
Warnings in this manual are classified according into their
severity and probability of occurrence.
Special warning signs
Some types of danger are represented by special symbols:
Validity
Some information in this manual has limited validity. The validity
is highlighted by a symbol.
Order number
Notes related to order numbers are identified by the shopping
cart symbol .
Handling instructions
ƔInstructions on actions are shown as a list. Actions of which
the sequential order must be maintained are numbered.
ÎResults of actions are identified with an arrow.
2.3 Avoid danger
The ROTEX Sanicube / HybridCube is state-of-the-art and is built
to meet all recognised technical requirements. However,
improper use may result in serious physical injuries or death, as
well as property damage.
To prevent such risks, install and operate ROTEX Sanicube /
HybridCube only:
– as stipulated and in perfect condition,
– with an awareness of the safety and hazards involved.
This assumes knowledge and use of the contents of this manual,
the relevant accident prevention regulations and the recognised
safety-related and occupational medical rules.
ƔKeep flammable materials away from the ROTEX Sanicube /
HybridCube.
DANGER!
Draws attention to imminent danger.
Disregarding this warning can lead to serious injury or
death.
WARNING!
Indicates a potentially dangerous situation.
Disregarding this warning can result in serious injury
or death.
CAUTION!
Indicates a situation which may cause possible
damage.
Disregarding this warning can lead to damage to
property and the environment.
This symbol identifies user tips and particularly useful
information, but not warnings or hazards.
Electric power
Risk of burning or scalding.
Observe stipulated tightening torque.
Only applicable for the unpressurised system (drain-back)
Only applicable for the pressurised system
WARNING!
This unit is not intended for use by persons (including
children) with impaired physical, sensory or mental
faculties or persons with insufficient experience and/or
expertise unless supervised by a person responsible
for ensuring their safety or are given instruction by this
person on how to use the unit.

2xSafety
FA ROTEX SC / SCS / HYC - 02/2013 5
2.4 Proper use
The ROTEX Sanicube / HybridCube may only be used as a hot
water storage tank. The ROTEX Sanicube / HybridCube must be
installed, connected and operated only according to the infor-
mation in this manual.
When connecting to a ROTEX heat pump you must use only the
storage tank connection kits (E-PAC) provided for the purpose.
ROTEX Only those electric immersion heaters supplied by
ROTEX may be used.
Any other use outside the intended use is considered as
improper. The operator alone shall bear responsibility for any
resulting damage.
Use as intended also involves compliance with maintenance and
inspection conditions. Spare parts must at least satisfy the
technical requirements defined by the manufacturer. This is the
case, for example, with the use of original replacement parts.
2.5 Instructions for operating safety
2.5.1 Before working on the hot water storage tank
and the heating system
ƔWork on the hot water storage tank and heating system (e.g.
installation, connection and initial start-up) should only be
carried out by authorised and trained heating experts.
ƔSwitch off the main switch before starting any work on the
domestic hot water storage tank and heating system and
secure it against unintentional switch-on.
ƔSeals must not be damaged or removed.
ƔMake sure that the safety valves comply with the require-
ments of EN 12828 when connecting on the heating side, and
with the requirements of EN 12897 when connecting on the
domestic water side.
2.5.2 Electrical installation of optional accessories
ƔBefore beginning work on live parts, disconnect them from the
power supply (switch off main switch, remove fuse) and
secure against unintentional restart.
ƔElectrical installations may only be carried out by qualified
electrical technicians under observance of the relevant
electrical guidelines and the regulations of the electric utilities
company.
ƔFor each hardwired power connection, install a separate
disconnector system compliant with EN 60335-1 for all-pole
disconnection from the power mains.
ƔCompare the mains voltage indicated on the nameplate with
the supply voltage before connecting to the mains.
2.5.3 Installation room
For safe and fault-free operation, it is necessary that the instal-
lation location of the ROTEX Sanicube / HybridCube fulfils
certain criteria. Information about the installation location for the
high-performance hot water storage tank can be found in High-
efficiency hot water storage tank chapter 4 "Set-up and instal-
lation".
Information on the installation site of other components can be
found in the associated documentation supplied with them.
2.5.4 Requirements of the heating and filling water
Avoid damages caused by deposits and corrosion: Observe
the current technological regulations to prevent corrosion
products and deposits.
Measures for desalination, softening or hardness stabilization are
necessary, if the filling and top-up water have a high total
hardness (>3 mmol/l - sum of the calcium and magnesium
concentrations, calculated as calcium carbonate).
2.5.5 Heating and sanitary side connection
ƔCreate a heating system according to the safety requirements
of EN 12828.
ƔWith sanitary connection, you must observe;
– EN 1717 - Protection of domestic water from contamina-
tion in domestic water installations and general require-
ments concerning safety equipment for the prevention of
domestic water contamination by back-flow
– EN 806 - Technical regulations for domestic water instal-
lations (TRWI)
– and, in addition, the country-specific legal regulations.
ƔDuring operation of the ROTEX Sanicube / HybridCube in
combination with the solar energy exploitation, the hot water
temperature can exceed 60°C. Scalding protection needs to
be included when you install the system (domestic hot water
mixing device e.g. VTA32, 15 60 16).
ƔUse a pressure reducer if the cold water connection pressure
>6 bar.
2.5.6 Operation
ƔOnly operate the ROTEX Sanicube / HybridCube;
– After all installation and connection work has been com-
pleted.
– With fully installed equipment covers and service
accesses.
– With sanitary side pressure reducers installed 
(max. 6 bar).
– With heating side pressure reducers installed 
(max. 3 bar).
– With completely filled storage containers (fill level dis-
play).
The specified servicing intervals should be adhered to and
inspection work must be carried out.
2.5.7 Instructing the user/owner
ƔBefore you hand over the heating system and the hot water
storage tank, explain to the owner how he/she can operate
and check the heating system.
ƔHand over the technical documentation (this document and
all supporting documents) to the user and advise him that
these documents must be made available at all times and be
stored in the immediate vicinity of the unit.
ƔDocument the hand-over by filling in and signing the checklist
in chapter 5.1 "Start-up", together with the operator.
2.5.8 Documentation
The technical documentation included in the scope of supply is a
constituent part of the equipment. It must be stored in such a way
that it can be consulted at any time by the operator or the techni-
cians.

6FA ROTEX SC / SCS / HYC - 02/2013
3 xProduct description
3 Product description
3.1 Design and components
Item Explanation Applicabletohotwater
storage tank
1 Cold water connection * all
2 Hot water * all
3 Storage tank charging flow (via 1st. heat source) * A / B / D - G / H - M / O / P
4 Storage tank charging return flow (via 1st. heat source) * A / B / D - G / H - M / O / P
5 Storage tank charging flow (via 2nd. heat source) * I / L / P
6 Storage tank charging return flow (via 2nd. heat source) * I / L / P
7 Heating support flow* (connect to return flow heat generator!) A / B / E/ F / H / I / K / L
8 Heating support return flow* (connect to return flow heating!) A / B / E/ F / H / I / K / L
9 Pressurised solar - flow E - G / K - M
10 Pressurised solar - return flow E - G / K - M
11 Drain-back solar - flow A - D / H - J
12 Storage tank (polypropylene double walled jacket with PUR hard foam heat insulation) all
13 Mount for solar R3 controller / handle all
14 Safety overflow connection (1¼" Outer thread, 1" Internal thread) all
15 Drain-back solar - return flow A - D / H - J
Filling and draining connection for storage tank water all
16 Fill level indicator all
17 Connection for electric immersion heater / booster heater (R 1½" Internal thread) all
18 Optional: Electric immersion heater (designated as a booster heater in heat pump systems.) all
19 Sensor pocket for tank temperature sensor all
20 Corrugated pipe stainless steel heat exchanger for domestic hot water generation via 1st. heat source all
21 Stainless steel corrugated pipe heat exchanger for charging storage tank (SL-WT1) via 1st. heat source A / B / D - G / H - M / O / P
22 Stainless steel corrugated pipe heat exchanger for charging storage tank (SL-WT2) via 2nd. heat source I / L / P
23 Corrugated pipe stainless steel heat exchanger for heating support P
24 Heat insulation shell for heating support heat exchanger P
25 Stainless steel corrugated pipe heat exchanger for charging pressurised solar storage tank (SL-WT3) L - K/ N - P
26 Thermal insulation shell for pressurised solar heat exchanger (SL-WT3) K - M / N - P
27 Solar inflow layering pipe A - B / H - I
28 Pressure-free storage tank water all
29 Solar zone A - M
30 Hot water zone all
31 Type plate all
A Hot water storage tank HYC 544/19/0-DB
B Hot water storage tank HYC 544/32/0-DB
C Hot water storage tank HYC 343/0/0-DB
D Hot water storage tank HYC 343/19/0-DB
E Hot water storage tank HYC 544/19/0-P
F Hot water storage tank HYC 544/32/0-P
G Hot water storage tank HYC 343/19/0-P
H Hot water storage tank SCS 538/16/0-DB
I Hot water storage tank SCS 538/16/16-DB
J Hot water storage tank SCS 328/14/0-DB
K Hot water storage tank SCS 538/16/0-P
L Hot water storage tank SCS 538/16/16-P
M Hot water storage tank SCS 328/14/0-P
N Hot water storage tank SC 538/0/0
O Hot water storage tank SC 538/16/0
P Hot water storage tank SC 538/16/16
X Recommended wall distance 200 mm
Outer
thread
Outer thread
Internal
thread
Internal thread
* Recommended accessories (Convection brake (2 in number), 16 50 70)
Tab. 3 -1 Legend designation for images in section 3.1.1 and 3.1.2.
 












  

3xProduct description
FA ROTEX SC / SCS / HYC - 02/2013 7
3.1.1 High-efficiency hot water storage tank (Unpressurised system - drain-back)
For heat pump systems (Type HYC-DB)
Fig. 3-1 Connections and dimensions, High-efficiency hot water storage tank with solar support - Type HYC-DB

8FA ROTEX SC / SCS / HYC - 02/2013
3xProduct description
Excluding heat pump systems (Types SC / SCS-DB)
Fig. 3-2 Connections and dimensions, High-efficiency hot water storage tank with solar support - Types SC / SCS-DB

3xProduct description
FA ROTEX SC / SCS / HYC - 02/2013 9
3.1.2 High-efficiency hot water storage tank (Pressurised system)
For heat pump systems (Type HYC-P)
Fig. 3-3 Connections and dimensions, High-efficiency hot water storage tank with solar support - Type HYC-P

10 FA ROTEX SC / SCS / HYC - 02/2013
3xProduct description
Excluding heat pump systems (Type SCS-P)
Fig. 3-4 Connections and dimensions, High-efficiency hot water storage tank with solar support - Type SCS-P

3xProduct description
FA ROTEX SC / SCS / HYC - 02/2013 11
3.2 Brief description
The ROTEX High-efficiency hot water storage tank is a combi-
nation of heat storage tank and instantaneous water heater.
The pressureless storage water serves as heat storage medium.
Useful heat is supplied and removed via the spiral corrosion-
resistant heat exchanger, which is made from a corrugated
stainless steel pipe (1.4404), and is completely immersed in the
storage tank water. In the heat exchanger for domestic hot water
generation, domestic hot water is stored at the temperature level
of the preparation zone.
The cold water which flows in when the hot water is drawn off is
first routed to the storage tank at the very bottom of the heat
exchanger, where it cools the lower zone of the storage tank
down as much as possible. The readiness zone is heated by an
external heat generator (condensing boiler, heat pump, solar
system, electric immersion heater). Water flows through the heat
exchanger for storage charging (SL-WT) from top to bottom.
On its way to the top, the domestic water continuously absorbs
the heat of the storage tank water. The flow direction, operating
on the principle of counter-flow, and the coil-shaped heat
exchanger create a pronounced temperature layering in the hot
water storage tank. As high temperatures can be maintained for
a very long time in the upper section of the storage tank, a high
hot water output is achieved even if water is drawn off over a long
period of time.
The ROTEX High-efficiency hot water storage tank listed in
sections 3.1.1 and 3.1.2 can be heated by solar in addition to the
external heat generator. Depending on the available heat from
the sun, the entire hot water storage tank can be heated up. The
stored heat is now used both for hot water generation and for
heating support. The high total storage capacity also temporarily
allows time without sunshine to be bridged.
If a ROTEX heat pump system is used as an external heat
generator, the primary hot water storage tank can only be one of
the "Hot water storage tanks for heat pump systems" listed in
section 3.1.1 or 3.1.2.
Optimum water hygiene
Low flow or unheated zones on the domestic water side are
completely excluded with the ROTEX High-efficiency hot water
storage tank. It is impossible for sludge, rust or other sediments
to be deposited, as can be the case with other large volume
tanks. The water which is fed into the system first is also
discharged first (first in, first out principle).
Low maintenance and corrosion
The ROTEX High-efficiency hot water storage tank is made of
plastic and is completely corrosion free. No sacrificial anode or
similar corrosion protection system is necessary. This means that
associated maintenance work, e.g. changing the protective
anodes or cleaning the storage tank, does not need to be carried
out on the ROTEX High-efficiency hot water storage tank. Only
the fill level of the storage tank water needs to be checked.
The corrugated stainless steel pipe heat exchangers on the
heating and potable water side are made from high quality
stainless steel (1.4404).
Low scaling
On the storage tank side only one deposition of scale is possible.
The immersion heater therefore remains clean, as do all the
stainless steel heat exchanger pipes in the storage tank water.
This means that no scale can build up which would continuously
reduce the efficiency of heat transfer in the course of operation
(as is the case with other storage tank designs).
The thermal and pressure expansion and high flow rates in the
domestic water heat exchanger release any possible scale
deposits, which are then flushed away.
Economical operation
The full area heat insulation of the storage tank ensures very low
heat losses in use and means that the best use is made of the
heat energy being applied.
Modular extension facility
If the heat output of a single ROTEX High-efficiency hot water
storage tank is not adequate, you can interconnect several
storage tanks in a modualr manner.
Electronic control
A control system integrated in the heat generator controls all
heating and hot water functions for the direct heating circuit, a
mixed heating circuit which can be connected as an option and a
storage tank charging circuit.
3.3 Accessories
3.3.1 Electric immersion heaters
In addition to the heating possibilities via the corrugated stainless
steel pipe heat exchanger from various different heat sources
and energy carriers, the ROTEX High-efficiency hot water
storage tank can also be charged using an electric immersion
heater.
Tab. 3 -2 Electric immersion heaters - overview and technical data
1) Temperature regulation and a safety temperature limiter (STB) are already in-
tegrated in the electric immersion heater. The electric immersion heater is de-
livered ready for fitting.
2) The longer heating element in the SCS means that the Solar zone is also heat-
ed if electric charging is used. This can reduce the efficiency of the solar sys-
tem.
SCS: Settings, displays and functions of the solar
heating are, for example, carried out by the regulating
and pump station RPS3.
HYC: When connecting to a ROTEX heat pump
system, the setting and regulation of the solar heating,
supplementary to the regulation and pump station
RPS3, is carried out via the regulator integrated in the
heat pump.
Type EHS/500/1 EHS/500/5 EHS/500/6
Operating voltage 230 V / 50 Hz 230/400 V /
50 Hz
230/400 V /
50 Hz
Heating output 2 kW 2, 4, 6 kW 2, 4, 6 kW
Temperature range 1) 35-65°C 30-78°C 30-78°C
Cable length — —
Heating element length 1.4 m 1.4 m 1.1 m
Screw-in thread R 1½" R 1½" R 1½"
Suitable for all SC + SCS 2) all SC + SCS 2) for SCS only
16 51 31 16 51 35 16 51 36

12 FA ROTEX SC / SCS / HYC - 02/2013
3xProduct description
Booster heater
In ROTEX heat pump systems, the electric immersion heater is
designated a booster heater.
Tab. 3 -3 Booster Heater - Overview and technical data
3.3.2 Non return valves
To prevent heat losses through the connection lines when the
heat pump is turned off and during periods without drinking water
flowing (gravitational circulation), circulation brakes (set of two,
16 50 70) should be built into the connections to the ROTEX
High-efficiency hot water storage tank.
3.3.3 Dirt filter
If the ROTEX High-efficiency hot water storage tank is connected
to a heating system with steel pipes, radiators or non-diffusion-
proof floor heating pipes, slurry and swarf could enter the hot
water storage tank and cause blockages, local overheating or
corrosion. This can be prevented by fitting a dirt filter or sludge
trap (see ROTEX price list).
3.3.4 Scalding protection
There is a danger of scalding at hot water temperatures over
60°C. Fitting scalding protection enables the hot water temper-
ature to be varied continuously and limited from 35 - 60°C.
– Scalding protection VTA32 ( 15 60 15)
– Screw connection kit 1" ( 15 60 16)
3.3.5 Solar storage tank extension kit
The following components are offered for the interconnection of
several ROTEX High-efficiency hot water storage tank to the
solar system:
– Solar storage tank extension kit CON SX ( 16 01 20)
– Solar storage tank extension kit CCON SXE ( 16 01 21)
– FlowGuard FLG ( 16 41 02)
Type BO3s
Operating voltage 230 V / 50 Hz
Heating output 3 kW
Temperature range 35-65°C
Cable length —
Heating element length 0.9 m
Screw-in thread R 1½"
Suitable for all HYC
16 51 37

4xSet-up and installation
FA ROTEX SC / SCS / HYC - 02/2013 13
4 Set-up and installation
4.1 Set-up
4.1.1 Important information
Requirement: The installation site meets the applicable country-
specific requirements.
Incorrect set-up and installation would render the manufacturer's
guarantee for the unit void. If you have questions, please contact
our Technical Customer Service.
4.1.2 Scope of delivery
– ROTEX Sanicube / HybridCube hot water storage tank
– Bag of accessories (see fig. 4-1)
WARNING!
The storage tank plastic wall on the ROTEX Sanicube
/ HybridCube can melt under the effects of external
heat (>80°C) and, in the extreme case, can catch fire.
ƔErect the ROTEX Sanicube / HybridCube only at a
minimum distance of 1 m to other heat sources
(>80°C) (e.g. electric heater, gas heater, chimney)
and flammable materials.
CAUTION!
ƔOnly erect the ROTEX Sanicube / HybridCube if a
ground load-bearing capacity of 1050 kg/m²
plus safety factor is guaranteed. The ground must
be flat and level.
ƔErection outdoors is only possible to a limited
extent. The storage tank must not be exposed to
continuous direct sunlight, as the UV radiation
and the effects of the weather will damage the
plastic.
ƔThe ROTEX Sanicube / HybridCube must be
protected from frost.
ƔMake sure that the supply company does not
provide corrosive domestic water.
– Suitable water treatment may be required.
CAUTION!
If the hot water storage tank is not installed
adequately lower than the flat solar panels (the top
edge of the of the storage tank is higher than the
bottom edge of the solar panel) the unpressurised
solar system in the outdoor area will be unable to drain
completely.
ƔErect the ROTEX Sanicube / HybridCube low
enough, with a solar connection, with regard to the
flat solar panels (observe minimum gradient in the
solar connecting lines).
HYBRIDCUBE
Observe the permitted lengths of pipes between the
hot water storage tank and the hydraulic connections
on the heat pump (see installation and operating
instructions of the heat pump and the relevant storage
tank connecting kit "E-PAC").
A Handle (required only for
transport)
B Cover screen
C Safety overflow connection
D Clamping piece for safety
overflow
E Installation spanner
Fig. 4-1 Contents of bag of accessories

14 FA ROTEX SC / SCS / HYC - 02/2013
4xSet-up and installation
4.1.3 Installing the hot water storage tank
ƔRemove the packaging and dispose of it in an environmen-
tally sound manner.
ƔUnscrew the threaded inserts (fig. 4-2, item G), onto which
the carrier loops are to be attached, from the hot water
storage tank.
ƔThread the carrier loops (item A) through the threaded pieces
(item G) and mount onto the available connections on the
front and back of the hot water storage tank.
ƔTransport the domestic hot water storage tank carefully to the
site of erection, using the handles provided.
ƔInstall the domestic hot water storage tank at the installation
site.
–Recommended distances (fig. 4-3):
From the wall (s1): 200 mm
To the ceiling (X): 1200 mm.
– Install the hot water storage tank close to the discharge
point.
ƔIf you are using an electric immersion heater (booster heater)
(see chapter 3.3.1 "Electric immersion heaters"), screw it
into the opening in the cover on the hot water storage tank
(example see fig. 4-3).
– Only tightne hand-tight ( see chapter 8.3 "Tightening
torque").
– With restricted headroom tilt the hot water storage tank
until the electric immersion heater can be fitted without
damage.
Fig. 4-2 Mount the handle
When setting up the unit in a cabinet, behind panels or
in other restricted conditions, sufficient ventilation (e.g.,
using ventilation gratings) must be ensured.
Switch the power supply to the electric immersion
heater (booster heater) on only after filling the hot water
storage tank.
Fig. 4-3 Erecting the hot water storage tank (shown on the 
HybridCube)

4xSet-up and installation
FA ROTEX SC / SCS / HYC - 02/2013 15
4.2 Installation
4.2.1 Important information
ƔFor potable water pipes observe the stipulations of EN 806
and EN 1717.
ƔThe position and dimensions of the connections can be taken
from fig. 4-4 to fig. 4-7.
ƔCheck the cold water connection pressure (maximum 6 bar).
– At higher pressure in the drinking water line, a pressure
reducer must be installed.
ƔConnect the pressure relief line to the safety pressure relief
valve and the membrane expansion tank as per EN 12828.
ƔNote tightening torque (see chapter 8.3 "Tightening
torque").
Avoid damages caused by deposits and corrosion: Observe
the relevant regulations of technology to prevent creation of
corrosion products and deposits.
Measures for desalination, softening or hardness stabilization are
necessary, if the filling and top-up water have a high total
hardness (>3 mmol/l - sum of the calcium and magnesium
concentrations, calculated as calcium carbonate.
4.2.2 Overview of connections
Sanicube (SC) / Sanicube Solaris (SCS)
WARNING!
There is a danger of scalding at water temperatures
>60°C. This can arise with solar energy utilisation, if
the Legionella protection is activated or if the target
temperature is set to >60°C.
ƔFit scalding protection 
(see chapter 3.3.4 "Scalding protection").
CAUTION!
If the hot water storage tank is connected to a heating
system with steel pipes, radiators or non-diffusion-
proof underfloor heating pipes, sludge and swarf could
enter the hot water storage tank and cause
blockages, local overheating or corrosion.
ƔFlush the feed pipes before filling the heat
exchanger.
ƔRinse out the heat distribution network (in the
existing heating system).
ƔFit a dirt filter or sludge catcher in the heating
return pipe (see chapter 3.3.3).
CAUTION!
If the heat exchanger has an external heating unit
(e.g. pressurised solar system, wood-buring boiler)
connected for charging the pressurised solar
system (fig. 4-5 / fig. 4-7, item 8+9), too high a flow
temperature can cause damage to or destroy the
ROTEX Sanicube / HybridCube.
ƔThe flow temperature on the external heating unit
should be limited to max. 95°C.
UK only!
CAUTION!
If filling or topping up the storage tank is done by
means of the boiler filling and drain valve, a temporary
filling loop must be used with the appropriate backflow
prevention device in accordance with clause G24.2,
Guidance to the Water Supply (Water Fittings)
Regulations 1999.
To prevent heat loss from the connection pipes when
the heating pump is switched off and during periods
when no domestic water is drawn off (gravity circula-
tion), you should fit circulation brakes (see chapter
3.3.2) in the connections to the ROTEX hot water stor-
age tank.
Fig. 4-4 External connections hot water storage tank 
(shown on type SCS 538/16/16-DB )

16 FA ROTEX SC / SCS / HYC - 02/2013
4xSet-up and installation
HybridCube (HYC)
Fig. 4-5 External connections hot water storage tank 
(shown on type SCS 538/16/16-P )
1 Cold water connection
2 Hot water*
3 Storage tank charging flow (via 1st. heat source)*
4 Storage tank charging return (via 1st. heat source)*
5 Storage tank charging flow (via 2nd. heat source)*
6 Storage tank charging return (via 2nd. heat source)*
7 Heating support flow* (connect to return flow heat generator!)
8 Heating support return flow* (connect to return flow heating!)
9 Pressurised solar - flow
10 Pressurised solar - return flow
11 Drain-back solar - flow (1¼" Outer thread, 1" Internal thread)
12 Storage tank
13 Mount for solar R3 controller / handle
14 Safety overflow connection
15 Drain-back solar - return flow or
Filling and draining connection for storage tank water with valve

insert
16 Filling level indicator
17 Connection for electric immersion heater (R 1½" Internal thread)
19 Sensor immersion sleeve for storage tank temperature sensor
31 Rating plate
AG Outer thread
IG Internal thread
* Recommended accessories (circulation brakes (2 in number),
16 50 70)
Tab. 4 -1 Legend for fig. 4-4 / fig. 4-5
Fig. 4-6 External connections hot water storage tank 
(shown on HYC 544/32/0-DB )
Fig. 4-7 External connections hot water storage tank

(shown on HYC 544/32/0-P )

4xSet-up and installation
FA ROTEX SC / SCS / HYC - 02/2013 17
4.2.3 Hydraulic connection
1. Only with connection of a HybridCube hot water storage tank
to a ROTEX heat pump:
ƔROTEX Mount the storage tank kit "E-PAC" for the
ROTEX heat pump to the HybridCube hot water storage
tank (see the individual installation and operating instruc-
tions included for the storage tank connection kit).
2. When using circulation brakes, fit them into the pipe
connections on the ROTEX Sanicube / HybridCube.
3. Connect the drain hose to the connector of the safety
overflow (fig. 4-4 to fig. 4-7, item 14) on the hot water storage
tank.
– Use transparent drain hose (draining water must be visi-
ble).
– Connect the drain hose to an adequately dimensioned
waste water installation.
– Drain should not be lockable.
4. Check the water pressure at the cold water connection
(<6 bar).
ÎIf the pressure in the domestic water supply is greater
then fit a pressure reducer and limit the water pressure to
<6 bar.
5. Create connection of the cold water inlet to the hot water
storage tank (fig. 4-4 to fig. 4-7, item 1).
6. Connect the connections to the hot water distribution network
(fig. 4-4 to fig. 4-7, item 2).
1 Cold water connection
2 Hot water*
3 Storage tank charging flow (via 1st. heat source)*
4 Storage tank charging return (via 1st. heat source)*
7 Heating support flow* (connect to return flow heat generator!)
8 Heating support return flow* (connect to return flow heating!)
9 Pressurised solar - flow
10 Pressurised solar - return flow
11 Drain-back solar - flow (1¼" Outer thread, 1" Internal thread)
12 Storage tank
13 Mount for solar R3 controller / handle
14 Safety overflow connection
15 Drain-back solar - return flow or
Filling and draining connection for storage tank water with valve

insert
16 Filling level indicator
17 Connection for booster heater (R 1½" Internal thread)
19 Sensor immersion sleeve for storage tank temperature sensor
31 Rating plate
AG Outer thread
IG Internal thread
* Recommended accessories (circulation brakes (2 in number),
16 50 70)
Tab. 4 -2 Legend for fig. 4-6 / fig. 4-7
Fig. 4-8 Installation of drain hose at safety overflow
In order to be able to flush out the stainless steel corru-
gated heat exchanger for domestic hot water heating in
the event of bad water quality, install a removal facility
to each of the cold water and hot water connections on
the storage tank (T-piece with draw-off cock).
Above a hardness level of >3 mmol/l we recommend
also fitting a dirty water filter that can be back-flushed
into the cold water connection.

18 FA ROTEX SC / SCS / HYC - 02/2013
4xSet-up and installation
7. Establish connections to the heating circuit.
–Sanicube: When connecting the heating side of the hot
water storage tank you must always ensure proper de-
areation of the storage tank charging pipes (e.g. by the
use of automatic vent valves at connections 3 to 6, 
fig. 4-4 / fig. 4-5).
–HybridCube: The heating side connection of the hot
water storage tank must be carried out in accordance with
the installation and operating instructions of the individual
storage tank connection kit (E-PAC). You must always
ensure proper de-aeration of the storage tank lines.
8. Establish connections to the heat generator.
–Sanicube: Create the connections to the heat generator
in accordance with the suitable plant schematic
(chapter 6.1 "Connection diagrams").
–HybridCube: In combination with a ROTEX heat pump,
the heating side connection of the hot water storage tank
must be carried out in accordance with the installation and
operating instructions of the individual storage tank con-
nection kit (E-PAC).
–With bivalent combustion, the connections need to be
carried out in accordance with the connection schematic
in the installation and operating instructions of the individ-
ual controllers.
–Optional: Connect the connections to the solar system
(see solar installation and maintenance manual).
9. Carefully lag the hot water pipes to prevent heat loss. Install
heat installation in accordance with country-specific
guidelines. ROTEX recommends a lag thickness of at least
20 mm.
4.2.4 Connecting together several hot water storage
tanks
If the heat output of a single ROTEX hot water storage tank is not
adequate you can interconnect several Sanicube / HybridCube
modules.
This means that both the stainless steel heat exchangers for
post-heating and the hot water heat exchangers are intercon-
nected in accordance with the Tichelmann principle (chapter 6
"Hydraulic connection").
With seasonal variations in demand these individual units can be
added or taken out of service accordingly. In this way the total hot
water output can be manually matched to the actual demand.
In chapter 8.2 "Performance diagrams" you can see what
efficiency characteristics can be achieved by interconnecting
several ROTEX Sanicube / HybridCube units.
For the interconnection of several ROTEX Sanicube /
HybridCube units we have the addditionally available storage
tank extension kit CON SX and the FlowGuards. For purchasing
information see chapter 3.3.5.
The installation and operation of this accessory component is
described in detail in the individual operating and installation
instructions provided.
4.2.5 Connection electric immersion heater / booster
heater (accessories)
1 Hot water storage tank
2 Regulation and pump unit RPS3
3 Solar flow distribution pipe
4 T-connector
CON SX B Storage tank extension kit
FLG FlowGuard
FLS FlowSensor
Fig. 4-9 Schematic for storage tank extension
WARNING!
If non-flame-resistant power supply cables are fixed
directly on the hot water storage tank they can catch
fire if the electrical cable is overheated.
ƔDo not lay or fix the power supply cable directly
on the hot water storage tank.
or
Ɣuse flame-resistant power supply cable 
(in accordance with IEC 60332.1).

4xSet-up and installation
FA ROTEX SC / SCS / HYC - 02/2013 19
Modifications on the electrical installation are dangerous and
prohibited. The operator alone shall bear responsibility for any
resulting damage.
Requirements
– For electrical connections and consumable electrical materi-
als (cable, insulation, etc.), follow all valid country-specific
guidelines.
– Cabling may only be connected to the terminal block intended
for this. No other terminal blocks may be used.
– Be sure that there is sufficient tension relief on all electrical
lines ( see chapter 8.3).
– The distance between the cabling of temperature sensors
and the power cable must always be at least 25 mm so that
the cables to the temperature sensor are not exposed to elec-
tromagnetic interference.
EHS/500/1
The EHS/500/1 is delivered ready to connect.
1. Check the power supply voltage of the mains connection
(~230 V, 50 Hz).
2. Insert the mains plug of the electric immersion heater into the
plug socket.
EHS/500/5, EHS/500/6
1. Check the power supply voltage of the mains connection
(~230 or 400 V, 50 Hz).
2. Disconnect the junction box of the domestic installation.
3. Unscrew the cap screws on the electric immersion heater and
remove the cap together with the regulating knob (fig. 4-10).
4. Remove and dispose of the folding sheet for installation.
5. Check the setting of the safety temperature limiter (STL)
(fig. 4-10); if necessary, push the pin in to release the
interlock.
6. Connect the electrical cables to the mains connection and the
terminal rail K1 on the electric immersion heater (fig. 4-10)
and connect to the mains connection of the domestic
installation ( see chapter 8.3).
– EHS/500/5 + EHS/500/6: fig. 4-11 or fig. 4-12
Ensure that the polarity is correct.
WARNING!
Touching live parts can result in an electric shock
and lead to potentially fatal injuries and burns.
ƔBefore beginning work on live parts,
disconnect them from the power supply (switch
off fuse, main switch) and secure against uninten-
tional restart.
ƔThe electrical connection and working on the
electrical components should only be performed
by electrical engineers in compliance with valid
standards and guidelines as well as the specifica-
tions of the energy supply company.
ƔFor each rigidly fixed cable connection fit a
separate isolator in accordance with EN 60335-1
for all-pole disconnection from the power mains
and a residual current device RCD (FI) in
accordance with the individual country-specific
regulations.
ƔThe equipment covers and maintenance
opening covers must be re-fitted immediately
after completion of the work.
As-delivered condition is "Connection variant l". For
Connection variants II + III the wiring on terminal block
K2 and the bridge positions must be adapted to suit.
K1 Terminal block (external connections)
K2 Terminal block (internal connections)
STL Safety temperature limiter
TR Temperature regulator (just EHS/500/5 and EHS/500/6)
Fig. 4-10 Electric immersion heater regulator unit

20 FA ROTEX SC / SCS / HYC - 02/2013
4xSet-up and installation
7. Place the cap with regulating knob on the electric immersion
heater. Make sure the regulating knob is located correctly.
8. Screw in the screws for the electric immersion heater cap
(see chapter 8.3).
9. Restore power supply to the junction box of the domestic
electrical installation.
BO3s
Connection of the electric immersion heater (booster heater) is
only possible in combination with a ROTEX heat pump. The
installation is to be carried out in accordance with the associated
installation and operating instructions of the ROTEX heat pump
and the individual storage tank connection kit (E-PAC).
4.2.6 Filling the hot water heat exchanger
1. Open the shutoff valve for the cold water supply pipe.
2. Open the hot water tap connections so that the draw-off
volume can be set as high as possible.
3. Once water has been discharged from the tap connections,
do not interrupt the cold water flow; this will ensure that the
heat exchanger will be fully vented and that any impurities or
residue will be discharged.
4.2.7 Filling the storage tank
Without installed solar system
1. Connect the filling hose.
a) All SCS hot water storage tank: 
Connect the filling hose with return flow preventer (1/2") to
the connection "Drain-Back Solar - Flow" (see fig. 4-4 to
fig. 4-7, item 11).
b) All +SC hot water storage tanks:

Connect the optional connection elbow AW BAS
(16 52 10) to the filling and drain connection 
(see fig. 4-4 to fig. 4-7, item 15) and connect the filling
hose there using the return flow prevention (1/2").
2. Fill the storage tank on the ROTEX Sanicube / HybridCube
until water comes out of the safety overflow connection 
(see fig. 4-4 to fig. 4-7, item 14).
With installed solar system
1. Mount the KFE cock (customer provision) to the optional
threaded connector (1" female, 1¼" male) of the solar
regulation and pump unit (RPS3).
2. Connect the filling hose with backflow preventer (1/2") to the
previously installed KFE cock.
3. Fill the storage tank on the ROTEX Sanicube / HybridCube
until water comes out of the safety overflow connection (see
fig. 4-4 to fig. 4-7, item 14).
4.2.8 Filling solar panel circuit
ƔFill the solar panel circuit and de-aerate in accordance with
the regulation and pump unit instructions.
4.2.9 Filling the heating system and the storage tank
charging circuit
ƔFill the heating system and storage tank charging circuit in
accordance with the installation instructions of the individual
heat generator (max. 3 bar) and de-aerate.
ƔAfter de-aeration, check the installation pressure again and
adjust if necessary (max. 3 bar).
Fig. 4-11 Connection allocation EHS/500/5 and EHS/500/6 - 
variants 1+2
Fig. 4-12 Connection allocation EHS/500/5 and EHS/500/6 - variants 3
I
L1
L2
L3
N
L1
L2
L3
3 ~400V / 50Hz
6000 W
D+E+F, 4+5
K2
TR/STB
K1
L1 L2 L3 N
II
3 ~230V / 50Hz
6000 W
K2
TR/STB
K1
A+B, C+D, E+F
L1 L2 L3
III
1 ~230V / 50Hz
6000 W
K2
TR/STB
K1
D+E+F, 1+2+3, 4+5
L1 N
UK only!
CAUTION!
If filling or topping up the storage tank is done by
means of the boiler filling and drain valve, a temporary
filling loop must be used with the appropriate backflow
prevention device in accordance with clause G24.2,
Guidance to the Water Supply (Water Fittings)
Regulations 1999.