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Aquarea air / water heat pump – design handbook 07 / 2014
Project Design
Planning heat source – air
Bi-Bloc system
The capacity of the bi-bloc systems decreases significantly with increas-
ing length of the refrigerant pipe runs. The capacity reduces depending
on the heat pump’s nominal capacity, either up to 12 kW nominal capac-
ity or 14 and 16 kW nominal capacity (see Table).
• The heat output of the outdoor unit may not be prevented by
additional protection apparatus like sun blind or similar.
• Locations at which the outside temperature decreases below -20 °C
must be avoided.
• The minimum clearances (see figure on following page) must be
observed.
• A drainage system using a drainage pipe leading to a gravel bed
in the frost-free subsoil is recommended for draining melt water in
de-icing mode (see installation example).
• Objects that can lead to short circuit of exhaust air must not be
erected.
• The operational noise emission of the outdoor unit should not lead to
irritation of the users or neighbours.
• If the outdoor unit is installed near the sea, in regions with a high
content of sulphur or at oily locations (e.g. machine oil, etc.), its
operational service life will be possibly shortened.
• The outdoor unit is to be installed on a concrete foundation or on a
stable base frame e.g. on a building external wall, aligned horizon-
tally, and fastened with bolts (ø 10 mm).
- Use additional vibration-damping rubber buffers for decoupling.
• For installation locations that can be influenced by strong winds e.g.
when a wind blows between buildings, including building roofs, the
outdoor unit must be secured on the building by means of an addi-
tional protection against toppling (e.g. cable).
• The hydromodule is only developed for internal installation and may
not be installed outdoors.
Capacity decrease in long
refrigerant pipe runs
Assembly conditions
and minimum distances
around outdoor unit
Pipe length of refrigerant (one-way)
up to 10 m
up to 20 m
up to 30 m
Pipe correction factor
1 .0
0 .83
0 .77
Pipe correction factors for consideration of the reduced heat pump heating capacity during the selection of the heat pump for
bi-bloc systems with
up to 12 kW nominal capacity
Pipe length of refrigerant (one-way)
up to 7 m up to 10 m up to 20 m up to 30 m up to 40 m
Pipe correction factor
1 .0
0 .91
0 .87
0 .83
0 .77
Pipe correction factors for consideration of the reduced heat pump heating capacity during the selection of the heat pump for
bi-bloc systems with
14 and 16 kW nominal capacity
