4
Outdoor temperature ranges for air-to-water heat pumps
Air-to-water heat pumps use the outdoor air as the heat source. Operation is only efficient within certain outdoor temperature
ranges, e.g. between -25°C and +43°C. If the upper temperature limit is exceeded or the lower temperature limit has been reached,
heat pumps switch off periodically. A corresponding notification appears on the heat pump controller. To cover the heat demand
for space heating and tap water heating beyond the temperature limits, the heat pump controller automatically switches on the
available auxiliary heating equipment, e.g. electric auxiliary heating, if necessary.
Required equipment
A communication bus cable between the outdoor module and the indoor module. Recommended: LiYY 2 x 0.34mm
2
max:
2 x 1.5mm
2
Refrigeration circuit
All the components of the refrigeration circuit are located in the outdoor module, including the refrigeration circuit controller with
an electronic expansion valve. Depending on the operating conditions, the compressor power is adjusted by means of an inverter.
When the space cooling function is activated, the refrigeration circuit is reversed.
Plumbing system
The indoor and outdoor modules are connected to each other via heating medium hydraulic lines. A high-efficiency circulation
pump (secondary pump) built into the indoor module supplies the heating medium to the secondary circuit. A central 3-way
diverter valve: “heating/ heating up tap water” is responsible for switching between space heating and hot tap water heating.
Installation with heating/cooling water buffer storage tank
■
Space heating
The heat pump may heat up to 2 heating/cooling circuits: 1 heating/cooling circuit without a mixer and 1 heating/cooling
circuit with a mixer
.
■
Space cooling
The heat pump may cool via up to 2 heating/cooling circuits.
Heat pump controller
The entire heating system is monitored and controlled by the heat pump controller.
The heat pump controller is integrated into the indoor module. Communication between the indoor and outdoor modules takes
place via a communication bus.
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