3 x Product 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
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