Setup And Configuration - Dhw Tank; Dhw Pump For Instant Hot Water; Dhw Pump For Disinfection - Rotex HPSU Bi-Bloc Ultra Series Installer's Reference Manual

Then the DHW consumption = (3×100 l)+(1×150 l)+(3×10 l)=480 l
Determining the volume and desired temperature for the DHW
tank
Formula
V =V +V ×(T −40)/(40−T )
1 2 2 2 1
V =V ×(40−T )/(T −T )
2 1 1 2 1
V DHW consumption (equivalent hot water volume at 40°C)
1
V Required DHW tank volume if only heated once
2
T DHW tank temperature
2
T Cold water temperature
1
Possible DHW tank volumes
Type
Standalone DHW tank
Energy saving tips
▪ If the DHW consumption differs from day to day, you can program
a weekly schedule with different desired DHW tank temperatures
for each day.
▪ The lower the desired DHW tank temperature, the more cost
effective. By selecting a larger DHW tank, you can lower the
desired DHW tank temperature.
▪ The heat pump itself can produce domestic hot water of maximum
55°C (50°C if outdoor temperature is low). The electrical
resistance integrated in the heat pump can increase this
temperature. However, this consumes more energy. We
recommend to set the desired DHW tank temperature below 55°C
to avoid using the electrical resistance.
▪ The higher the outdoor temperature, the better the performance of
the heat pump.
▪ If energy prices are the same during the day and the night, we
recommend to heat up the DHW tank during the day.
▪ If energy prices are lower during the night, we recommend to
heat up the DHW tank during the night.
▪ When the heat pump produces domestic hot water, it cannot heat
up a space. In case you need domestic hot water and space
heating at the same, we recommend to produce the domestic hot
water during the night when there is lower space heating demand.
5.4.3 Setup and configuration – DHW tank
▪ For large DHW consumptions, you can heat up the DHW tank
several times during the day.
▪ To heat up the DHW tank to the desired DHW tank temperature,
you can use the following energy sources:
▪ Thermodynamic cycle of the heat pump
▪ Electrical booster heater
RRGA04~08DAV3 + RHBX04+08DA
ROTEX HPSU Bi-Bloc Ultra
4P495262-1B – 2019.10
Example
If:
▪ V =180 l
2
▪ T =54°C
2
▪ T =15°C
1
Then V =280 l
1
If:
▪ V =480 l
1
▪ T =54°C
2
▪ T =15°C
1
Then V =307 l
2
Possible volumes
▪ 150 l
▪ 180 l
▪ 200 l
▪ 250 l
▪ 300 l (polypropylene tank is
compatible with solar kit)
▪ 500 l (compatible with solar kit)
5 Application guidelines
▪ For more information about:
▪ Optimizing the energy consumption for producing domestic hot
water, see "8 Configuration" [ 4 47].
▪ Connecting the electrical wiring of the standalone DHW tank to
the indoor unit, see the installation manual of the DHW tank,
and the addendum book for optional equipment.
▪ Connecting the water piping of the standalone DHW tank to the
indoor unit, see the installation manual of the DHW tank.
5.4.4

DHW pump for instant hot water

Setup
h
f
c
a
i
b
g
a Indoor unit
b DHW tank
c DHW pump (field supply)
f Shower (field supply)
g Cold water
h Domestic hot water OUT
i Recirculation connection
▪ By connecting a DHW pump, instant hot water can be available at
the tap.
▪ The DHW pump and the installation are field supply and the
responsibility of the installer. For the electrical wiring, see
"7.9.12 To connect the domestic hot water
▪ For more information about
connection, see the installation manual of the domestic hot water
tank.
Configuration
▪ For more information, see "8 Configuration" [ 4 47].
▪ You can program a schedule to control the DHW pump via the
user interface. For more information, see the user reference
guide.
5.4.5

DHW pump for disinfection

Setup
h
c
a
i d f
b
e g
a Indoor unit
b DHW tank
c DHW pump (field supply)
d Heater element (field supply)
e Non‑return valve (field supply)
f Shower (field supply)
g Cold water
h Domestic hot water OUT
i Recirculation connection
▪ The DHW pump is field-supplied and its installation is the
responsibility of the installer. For the electrical wiring, see
"7.9.12 To connect the domestic hot water
▪ If the applicable legislation requires a higher temperature than the
maximum tank setpoint during disinfection (see [2-03] in the field
settings table), you can connect a DHW pump and heater element
as shown above.
▪ If applicable legislation requires disinfection of the water piping
until the tapping point, you can connect a DHW pump and heater
element (if needed) as shown above.
pump" [ 4 45].
connecting the recirculation
pump" [ 4 45].
Installer reference guide
17