Technical data

30 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
2.4.2 Air-to-water heat pumps
Condensate drain of the outdoor unit
Condensate occurring in the outdoor unit during operation must
be drained off frost-free. To this end, a drain elbow must be
mounted on the base of the outdoor unit (see Fig. 2.30 on
page 30). In warmer regions, the installation of a condensate tray
heater in addition to this is also recommended. In colder regions
that experience long periods of frost, the installation of conden-
sate tray heating is absolutely essential. The condensate tray
heating is available as an accessory.
Fig. 2.30: Condensate drain outdoor unit
Development costs indoor unit
 Do not install any heat source in the vicinity of the device.
 Ensure that there is a good circulation of air inside the room
 The device must be installed on the wall vertically
 The device must be mounted in a room which is free of frost
 Minimum clearances must be observed
(see Fig. 2.31 on page 30)
Fig. 2.31: Indoor unit installation
Fig. 2.32: LIA 7IM / LIA 9IM basic device
Fig. 2.33: LIA 12IM / LIA 14IM / LIA 16IM basic device
1) Indoor unit main circuit board
2) Control panel
3) Pressure relief valve
4) Flow switch
5) Pressure gauge
6) Circulating pump
7) RCCB (3 units)
8) Overload protection (3 units)
9) Pipe heater
10) Expansion vessel
2.4.2 Dimensioning
The heat output of air-to-water heat pumps decreases when the
outside temperature drops, while the heat consumption of the
building increases at the same time. The heat pump must be se-
lected in such a manner so that the controlling range between the
minimum and maximum heat output covers the majority of the
annual heat output. If the building's heat consumption exceeds
the maximum heat output of the split heat pump, the supplemen-
tary electric heater is activated.
The split heat pumps LIA 7IM and LIA 9IM are also equipped with
a 3 kW pipe heater. With the models LIA 12 to LIA 16IM, a 6 kW
pipe heater is already pre-installed. The diagrams show two de-
sign examples for a standard outside temperature of -5 °C and
-15 °C respectively.
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