Viessmann VITOCAL 300-G Technical Manual page 37

Design information
2°
Example of a wall outlet
A To the heat pump
B Building
C Foundations
D Drainage
E Seal
F Pipe liner
G Crushed stone
H PE 32 × 3.0 (2.9)
K Ground
All pipes, profiles etc. must be made from corrosion-resistant materi-
als. Flow and return lines transport cold brine (brine temperature <
cellar temperature). For that reason, all pipes inside the house and the
wall outlets (even inside the wall structure) must be thermally insulated
and vapour diffusion-proof to prevent the formation of condensation
and subsequent damage from moisture. Alternatively, a drain can be
installed to remove condensate. Practical experience has shown that
a prepared brine mixture is satisfactory for filling the system.
Required brine distributor 100 m length at ³
Heat pump F
²
K E
type
(roun-
ded)
kW 2
m
Single stage heat pump
BW 121 17
BW 129 23.3
BW 145 34.2
Two-stage, both stages with the same output
BW+BWS 34
121+121
BW+BWS 46.6
129+129
BW+BWS 68.4
145+145
Two-stage, stages with different output
BW+BWS 40.3
121+129
BW+BWS 51.2
121+145
BW+BWS 57.5
129+145
VITOCAL 300-G
(cont.)
2
= 25 W/m (estimated sizing)
E
PE 20 × 2.0
Pipe circuits Brine distribu-
tor
Part no.
700 21 3 x 7143 762
940 28 4 x 7143 762
1370 41 on-site
1360 41 on-site
1870 56 on-site
2740 82 on-site
1620 49 on-site
2050 62 on-site
2300 69 on-site
Pipework should be routed on the outside of the building with a slight
slope to prevent ingress of water during heavy rain. A good drainage
system will ensure that the rainwater drains away.
The use of approved wall outlets (e.g. Doyma) is required if the site
makes specific demands regarding pressing water.
Rough sizing
Basis for sizing is the refrigerating capacity ²
operating point B0/W35.
Required area F = ² /³ (average extraction rate subject to ground
E K E
conditions).
Required number of pipe circuits @ 100 m length subject to F
pipe dimension:
■ With PE 20 × 2.0:
Pipe circuits @ 100 m length = F
■ With PE 25 × 2.3:
Pipe circuits @ 100 m length = F
■ With PE 32 × 3.0 (2.9):
Pipe circuits @ 100 m length = F
The detailed design depends on the ground structure and can only be
determined following a local inspection.
PE 25 × 2.3
Pipe cir- Brine distribu-
cuits tor
Part no.
14 2 x 7182 043
2 x 7373 331
19 on-site
27 on-site
27 on-site
37 on-site
55 on-site
32 on-site
41 on-site
46 on-site
of the heat pump at
K
and the
E
· 3/100
E
· 2/100
E
· 1.5/100
E
PE 32 × 2.9
Pipe circuits Brine distribu-
tor
Part no.
12 4 x 7373 329
14 2 x 7143 763
2 x 7373 329
21 on-site
20 on-site
28 on-site
41 on-site
24 on-site
31 on-site
35 on-site
VIESMANN
37
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