4 x Set-up and installation
FA ROTEX HPSU compact 4 - 06/2015
19
4.3.1 Connecting hydraulic lines
Requirement: Optional accessories (e.g. Solar, backup heater)
mounted on the ROTEX HPSU compact according to the specifi-
cations of the instructions included.
Ɣ Check cold
water pressure (maximum 6 bar).
– At higher pressure in the drinking water line, a pressure
reducer must be installed.
Ɣ Estab
lish hydraulic connections at the ROTEX HPSU
compact.
– Position and dimensions of the heating connections to be
taken from fig. 4-1 / fig. 4-2 and from tab. 3-1.
– Pay attention to the stipulated tightening torque
(see chapter 10.3 "Tightening torque").
– Design the lines as such that
the sound attenuation cowl
can be applied without any problem following assembly.
– Connect the water for filling or refilling the heating system
as specified by EN 1717 to avoid contamination of drink-
ing water by backwash.
Ɣ Conn
ect the blow-off line to the safety over-pressure valve
and diaphragm expansion vessel in accordance with
EN 12828.
Ɣ Carefull
y insulate pipe lines against heat loss and so as to
avoid the formation of condensation (insulation thickness at
least 20 mm).
– W
ater shortage protection: The pressure and temperature
monitoring of the control unit safely switches off the ROTEX
HPSU compact in the event of a water shortage. No addi-
tional water shortage protection is needed in the construction.
– Av
oid damages caused by deposits and corrosion:
Observe the relevant regulations of technology to prevent
creation of corrosion products and deposits.
Minimum requirements regarding the quality of filling and sup-
plementary water:
– Water hardness (calcium and magnesium, calculated as
calciu
m carbonate): 3 mmol/l
– Conductivity: 270
0 ȝS/cm
– Chloride: 250 mg/l
– Sulphate: 2
50 mg/l
– pH value (heating water): 6,5 - 8,5
In the case of filling and top-up wa
ter with a high overall hardness
or other properties that deviatte from the minimum requirements,
measures for the desalination, softening, hardness stabilisation
or other suitable conditioning measures are required to maintain
the required water quality.
Ɣ Connect the drain hose to the connection piece for the safety
overflow (fig. 3-2 to fig. 3-5, pos. 23).
– Use transparent drain hose (draining water must be visi-
ble).
– Connect the drain hose to an adequately dimensioned
waste water install
ation.
– Drain should not be lockable.
4.4 Electrical connection
WARNING!
There is a danger of scalding at hot water tempera-
tures over 60 °C. This is possible, when solar energy is
used, with a connected external heating device, when
the Legionella protection is activated or when the do-
mestic hot water target temperature is set higher than
60 °C.
Ɣ In
stall a scald protection (domestic hot water
mixing unit (e.g., VTA32 15 60 15).
Fig. 4-6 Installation of drain hose at safety overflow
WARNING!
Touching live parts can result in an electric shock
and lead to potentially fatal injuries and burns.
Ɣ Before beginning work on live parts, disconnect
all of the systems circuits from the power supply
(switch off main switch, disconnect fuse) and
secure against unintentional restart.
Ɣ T
he 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.
Ɣ T
he equipment covers and maintenance
opening covers must be re-fitted immediately
after completion of the work.
CAUTION!
In the controller housing of the ROTEX HPSU
co
mpact, in continuous running, elevated tempera-
tures can be ge
nerated. This can result in currently-
carrying wires from reaching higher temperatures
during operation due to self-heating. For this reason,
these lines need to have a continuous use temper-
ature of 90 °C.
Ɣ F
or the following connections, use only cables with
a long-term use temperature 90 °C:
– Exterior heat pump unit
– Optional: Electrical Backup Heater (BUxx)
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