Multiple Rooms - Two Lwt Zones - Rotex HPSU Bi-Bloc Ultra Series Installer's Reference Manual

5 Application guidelines
▪ For each room with underfloor heating: The desired room
temperature is set via the external room thermostat (wired or
wireless).
▪ The user interface integrated in the indoor unit decides the space
operation mode. Mind that the operation mode on each external
room thermostat and remote controller of the heat pump
convectors must be set to match the indoor unit.
INFORMATION
To increase comfort and performance, we recommend to
install the valve kit option EKVKHPC on each heat pump
convector.
Configuration
Setting
Unit temperature control:
▪ #: [2.9]
▪ Code: [C-07]
Number of water temperature
zones:
▪ #: [4.4]
▪ Code: [7-02]
5.2.3 Multiple rooms – Two LWT zones
If the heat emitters selected for each room are designed for different
leaving water temperatures, you can use different leaving water
temperature zones (maximum 2).
In this document:
▪ Main zone = Zone with the lowest design temperature in heating,
and the highest design temperature in cooling
▪ Additional zone = Zone with the highest design temperature in
heating, and the lowest design temperature in cooling
CAUTION
If there is more than one leaving water zone, ALWAYS
install a mixing valve station in the main zone to decrease
(in heating)/increase (in cooling) the leaving water
temperature when the additional zone has demand.
Typical example:
Room (zone)
Living room (main zone)
Bed rooms (additional zone)
Installer reference guide
14
Value
0 (Leaving water): Unit
operation is decided based on
the leaving water temperature.
0 (Single zone): Main
Heat emitters: Design
temperature
Underfloor heating:
▪ In heating: 35°C
▪ In cooling: 20°C (only
refreshment, no real cooling
allowed)
Heat pump convectors:
▪ In heating: 45°C
▪ In cooling: 12°C
Setup
d
A Additional leaving water temperature zone
B Room 1
C Room 2
D Main leaving water temperature zone
E Room 3
a Remote controller of the heat pump convectors
b User interface used as room thermostat
c Mixing valve station
d Pressure regulating valve
INFORMATION
A pressure regulating valve should be implemented before
the mixing valve station. This is to guarantee the correct
water flow balance between the main leaving water
temperature zone and the additional leaving water
temperature zone in relation to the required capacity of
both water temperature zones.
▪ For the main zone:
▪ A mixing valve station is installed before the underfloor heating.
▪ The pump of the mixing valve station is controlled by the ON/
OFF signal on the indoor unit (X2M/29 and X2M/21; normally
closed shut-off valve output).
▪ The room temperature is controlled by the user interface, which
is used as room thermostat (optional equipment EKRUDAS).
▪ For the additional zone:
▪ The heat pump convectors are directly connected to the indoor
unit.
▪ The desired room temperature is set via the remote controller of
the heat pump convectors for each room.
▪ The heating or cooling demand signals of each heat pump
convector are connected in parallel to the digital input on the
indoor unit (X2M/35 and X2M/30). The indoor unit will only
supply the desired additional leaving water temperature when
there is an actual demand.
▪ The user interface integrated in the indoor unit decides the space
operation mode. Mind that the operation mode on each remote
controller of the heat pump convectors must be set to match the
indoor unit.
A
C
B
a a
D
c
E
b
RRGA04~08DAV3 + RHBX04+08DA
ROTEX HPSU Bi-Bloc Ultra
4P495262-1B – 2019.10