Preparing for installation
7
AWE – 6721835317 (2021/09)
Fig. 5 Dimensions and connections
4 Preparing for installation
The particle filter is installed horizontally in the return of the heating
system. Note the direction of flow of the filter.
The drain pipe of the pressure relief valve in the indoor unit must be
installed so that it is protected against frost, and the drain pipe must be
routed to the drain.
▶ Run the connector pipes for the heating system and cold/domestic
hot water in the building up to the installation location of the indoor
unit.
4.1 Assembly of the indoor unit
• The indoor unit is placed in the building. The pipework between the
heat pump and indoor unit must be as short as possible. Use
insulated pipes.
• The installation location for the indoor unit must have a drain.
4.2 Minimum volume and execution of the heating
system
To safeguard the heat pump function and avoid an excessive number of
start/stop cycles, incomplete defrosting and unnecessary alarms, it
must be possible to store a sufficient amount of energy in the system.
This energy is stored in the water volume of the heating system, and also
in the components of the system (radiators) and concrete floor
(underfloor heating system).
As the requirements for different heat pump installations and heating
systems vary considerably, a minimum water volume in litres is generally
not specified. Instead, the system volume is considered to be sufficient
if certain conditions are met.
Underfloor heating system without buffer cylinder
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
areas can lead to the auxiliary heater being activated in the final phase of
the defrosting process.
• ≥6m
2
floor area required for heat pump 5 – 9.
• ≥ 22 m
2
floor area required for heat pump 13 – 17.
To ensure maximum energy savings and avoid auxiliary heater operation,
the following configuration is recommended:
• ≥ 30 m
2
floor area for heat pump 5 – 9.
• ≥ 100 m
2
floor area for heat pump 13 – 17.
System with radiators without mixer and buffer cylinder
If the system only contains a few radiators, the auxiliary heater may be
activated in the final phase of the defrosting process. The radiator
thermostats must be opened fully.
• ≥ 1 radiator with 500 W rating required for heat pump 5 – 9.
• ≥ 4 radiators each with roughly 500 W rating required for heat pump
13 – 17.
To ensure maximum energy savings and avoid auxiliary heater operation,
the following configuration is recommended:
• ≥ 4 radiators with 500 W rating for heat pump 5 – 9.
Heating system with underfloor heating system and radiators in
separate heating circuits without buffer cylinders
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
areas or only a few radiators in the system can lead to the auxiliary heater
being activated in the final phase of the defrosting process.
• ≥ 1 radiator with 500 W rating required for heat pump 5 – 9.
• ≥ 4 radiators each with roughly 500 W rating required for heat pump
13 – 17.
Although a minimum floor area is not required for the underfloor heating
circuit, to avoid auxiliary heater operation and achieve optimum energy
savings, additional heating thermostats or several valves of the
underfloor heating system must be at least partially open.
Only heating circuits with mixer
A buffer cylinder is essential in heating systems consisting only of
heating circuits with mixer.
• Required volume for heat pump 5 – 9 = ≥ 50 litres.
• Required volume for heat pump 13 – 17 = ≥ 100 litres.
Only fan convectors
To prevent the auxiliary heater from being activated in the final phase of
the defrosting process, a buffer storage tank with a capacity of ≥ 10 l is
required.
Cooling mode
If cooling mode is activated and run in combination with fan coils it is
recommended to add a buffer cylinder ≥ 100 litres in the system for best
performance and comfort.
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