6 Piping installation
6.1 Information collector pipe
Caution! Local rules and regulations related to type of collector must be followed.
Borehole collector: Fully welded plastic pipe collector (PEM PN 6.3) according to the applicable local and national
regulations with factory manufactured return bend.
Ground collector: Fully welded plastic pipe collector (PEM PN 10) according to the applicable local and national
regulations.
In countries where frost damage occurs, the collector pipe beside an outer wall (minimum 2 metres) must be insu-
lated in such a way that frost damage is prevented. This applies regardless of ground, rock or lake heat.
Minimum shaft depth between the energy well and the building is 0.5 m. If burial to that depth is not possible the
pipes must be protected against any external mechanical damage.
Figure 16. Shaft depth for, and insulation of, collector hoses
6.2 Connection of several brine coils
When several brine coils are used for a heat pump installation, regardless of what heat source is used, the length of
the coils must not exceed the values in the following tables. The coil lengths are based on ethanol 30% at 0°C.
For hoses of type PEM DN 32, Ø
i
= 28.0:
Table 2. Maximum coil length, hose type PEM DN 32, Øi = 28.0
DHP-H, DHP-C, DHP-L Calculated maximum coil length per coil, in metres
Size 1 coil 2 coils 3 coils 4 coils
6 <390 <2 x 425 - -
8 <300 <2 x 325 - -
10 <270 <2 x 395 - -
12 <190 <2 x 350 - -
16 <70 <2 x 175 <3 x 183 4 x 197
Table 3. Maximum coil length, hose type PEM DN 32, Øi = 28.0
DHP-H Opti, DHP-H Opti Pro, DHP-L
Opti, DHP-L Opti Pro
Calculated maximum coil length per coil, in metres
Size 1 coil 2 coils 3 coils 4 coils
6 <390 <2 x 425 - -
8 <320 <2 x 345 - -
10 <250 <2 x 365 - -
12 <170 <2 x 315 - -
16 <80 <2 x 200 <3x 207 <4 x 225
Service instructions VMGFC302 – 21
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