21
Aquarea air / water heat pump – design handbook 07 / 2014
Heat pump system
Systematics and overview
Overview
Difference between Bi-Bloc system (left) and monobloc system (right)
The bi-bloc system consists of a freely installed outdoor unit and a
hydromodule that is normally installed in the installation room or in a
different frost-free room. In the case of this design, the two units are
connected by means of refrigerant piping, in which there is no danger of
freezing. The heat pump is controlled by means of the controller on the
hydromodule.
The Monobloc system consists of only one unit that is installed outdoors.
Refrigerant piping is not required for the installation, it is connected
directly to the heating system. Monobloc systems are easy to install, but
need more space. Moreover, the water within the heating system is in
danger of freezing due to power failure or when the power supplier cuts
off the supply.
The heat pump is operated via a wired remote control that is mounted
inside the building and is connected to the Monobloc unit by means
of a 15-metre long cable.
Bi-Bloc system
Monobloc system
Bi-Bloc and Monobloc system
1
4
3
5
2
2
1
Refrigerant circuit
2
Heating circuit (water)
3
Outdoor unit
4
Hydromodule
5
Monobloc unit
Attention
The Monobloc system is in danger of freezing when the heating circuit
is filled with water and the outside temperature decreases below +4 °C!
This can lead to substantial damage to the unit.
Freedom from frost must be ensured within the heating system through
one of the following options:
1. The heating circuit is operated with a foodgrade frost protection
mixture (propylene glycol).
2. An auxiliary electric heater inside the Monobloc unit prevents the
heating circuit from freezing.
3. The heating circuit is emptied via an owner-provided device
(manually or automatically).