TD SOLUS II:
Planning aid
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due to the low heat exchanger volume for the hot water
circuit. A water-shock damper is recommended to prevent
safety valve dripping.
Increasing the pouring capacity:
To further increase the pouring capacity,
SOLUS II storage tanks can be operated with a hot water
storage tank and a recirculation pump
(see CONUS 502 technical documentation).
Hot water mixer:
To prevent scalding at high storage tank temperatures, a hot
water mixer must be provided downstream of the storage
tank outlet. A hot water mixer is available as an accessory
(item no. ZB001).
2.3
Connection to the solar power system
Collector:
The SOLUS II series is equally suitable for operation with flat
and evacuated tube collectors. The technical data (page 12)
contains recommended values for collector surface areas.
Smaller surfaces do not charge the tank fully, larger sur-
faces increase the solar yield which can be used for heating
support in particular, but lead to frequent system system
standstills in the summer, when the heat cannot be dissi-
pated elsewhere.
Pipe diameters and pump:
The circulation of the solar circuit is run with reduced flow
compared to conventional solar power systems. The re-
quired pipe diameters must be calculated in conjunction
with the collector data and the selected pump.
Controller:
Operation of the SOLUS II storage tanks with a CONTROL-
series controller ensures optimal stratified charging. If third
party controllers are used, the maximum permissible inlet
temperature at the solar heat exchanger must be observed.
This temperature is 110 °C; the solar controller must be de-
activated at the corresponding collector temperature.
See the connection information (from p. 6) or the controller
connection information for the CONTROL series for informa-
tion on possible connections and controller connections.
2.4
Connection to the boiler and heating circuit
Boiler:
The SOLUS II storage tanks allow a range of heating circuits
and heat generators to be connected to points in accor-
dance with their temperatures. Boiler and heating circuits
are connected directly to the storage tank. This allows boiler
outputs of up to 80 kW to be transferred. The SOLUS II
storage tanks are designed for low return temperatures.
When using boilers which are sensitive to low return tem-
peratures, appropriate precautions must be taken, espe-
cially when connection R3 is used.
The target temperature for the hot water standby portion set
on the boiler or solar controller must be approx. 10-15 K
greater than the hot water temperature actually required,
depending on the tap output required. The boiler supply
temperature for backup heating must be a further 5 K above
the described target temperature of the storage tank. For
this purpose, it may be necessary to throttle the boiler sup-
ply.
Connections:
The SOLUS II storage tank connections are in the vertical
line of the insulation seal strip. They are equipped with baf-
fles for low turbulence stratification up to 20 l/min. The baf-
fle of boiler supply 2 is suitable for up to 30 l/min.
Heating circuit:
All connected heating circuits must be diffusion-resistant. If
that is not guaranteed, the systems must be separated.
NOTE:
In heating circuits where sludge deposits are to be ex-
pected, we recommend the installation of a sludge filter
or separator (vendor e.g. Spiro).
We recommend the use of a heating circuit mixer to guar-
antee the supply temperature, which is dependent on the
external temperature. This allows the energy consumption to
be reduced significantly. A complete heating circuit station
is available as an accessory.
2.5
Parallel connection of two SOLUS II storage
tanks
Parallel connection of the heat exchanger and storage tank
connections allows the storage tank capacity and the output
of hot water and solar heat exchangers to be doubled,
while halving pressure losses. The temperature sensors are
connected to one of the two storage tanks.
2.6
Electrical backup heating
An electrical heating rod sleeve with 1 1/2" male thread is
positioned such that heat can be used for space heating via
the heating supply.
Electrical backup heating should be avoided where possible
due to the low efficiency of the power stations.
However, in exceptional cases, it can make sense for the
few backup heating hours in summer, e.g. in conjunction
with a solid fuel burner operated in winter only.
Heating rods must be fitted with a safety temperature limiter
in accordance with EN 60335 Parts 1 and 2.
2.7
Materials
The most commonly used materials are as follows, in the
order of their weight shares: steel, copper, EPS foam
(melamine resin foam as a cover for SOLUS II 2200), poly-
