Technical data

32 | 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
Fig. 2.37: Design example LIA 14IM
Fig. 2.38: Design example LIA 16IM
The connection between the indoor and outdoor unit takes place
via refrigerant pipes. Unfilled refrigerant pipes with a length of 25
m are available as accessories. If the distance between the in-
door and outdoor unit is larger than 10 m with split heat pumps
LIA 7IM or LIA 9IM, additional refrigerant must be added. This
means that, with an LIA 7IM with a distance of 20 m between the
indoor and outdoor unit, 300 g refrigerant must be added (see
Table 2.13 on page 32).
ATTENTION!
Assembly and maintenance work on refrigerant lines may only be carried
out by trained specialists
ATTENTION!
If the indoor unit is mounted 4 or more metres higher than the outdoor
unit, a refrigeration specialist must perform a separate check to ensure
that the devices for conveying the oil up and down the pipes have been
installed correctly in the hot gas pipe.
Table 2.13:Design table for refrigerant refilling
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Model Pipe length
Nomi-
nal
length
(m)
Max.
height
diff.
(m)
outdoor
unit
Min.
line
length
(m)
Max.
line
length
(m)
Addi-
tional
refriger-
ant
(g/m)
Gas Liquid
LIA
7IM
5/8“ 1/4“ 7 20 3 30 30
LIA
9IM
5/8“ 1/4“ 7 20 3 30 30
LIA
12IM
5/8“ 3/8“ 7 30 3 30 -
LIA
14IM
5/8“ 3/8“ 7 30 3 30 -
LIA
16IM
5/8“ 3/8“ 7 30 3 30 -