STIEBEL ELTRON Heat pumps, Technical Manual

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platE-typE HEat ExcHangEr
Heat exchanger
Accessories
Type WT 10 WT 20 WT 30 WT 40
Part no. 07 06 33 07 06 34 07 10 91 22 93 38
Specification
Primary temperature °C 60 > 52 60 > 52 60 > 52 60 > 52
secondary temperature °C 55 < 45 55 < 45 55 < 45 55 < 45
Primary pressure drop hPa 70 100 90 90
secondary pressure drop hPa 50 70 60 60
Primary flow rate m³/h 1.1 2.3 3.2 6.0
secondary flow rate m³/h 0.9 1.9 2.5 4.8
output kw 10 22 32 50
Weight and dimensions
Height mm 304 304 304 304
width mm 103 103 103 103
Depth mm 65 102 140 280
weight kg 2.8 4.4 6.0 14.0
Technical description:
Plate-type heat exchanger with thermal insulation for DHw heating. Comprises several
hard soldered stainless steel plates.
Inlet connector for floorstanding DHw cylinder
for floorstanding stiebel eltron cylinder sb l 302 – 402 602 – 1002
Part no. 07 29 97 07 29 98
Specification
DHw cylinder connection inches G 1" G 2"
inlet pipe connection inches G 1" G 1"
length of the inlet pipe m 0.5 0.7
Technical description:
inlet pipe for feeding water from an external heat exchanger.
Effect of water-borne particles in DHW systems on copper-soldered plate-type heat
exchangers (water quality requirements / limits)
pH value 7 to 9 Free chlorine < 0.5 ppm
so
4
< 100 ppm Fe < 0.5 ppm
HCo
3
- so
4
> 1 Mn < 0.05 ppm
Ci < 50 ppm Co
2
< 10 ppm
Po
4
< 2 ppm H
4
s < 50 ppb
nH
3
< 0.5 ppm Conductivity > 50 us/cm,
wall temperature < 80 °C
Additional factors with an influence on corrosion are water contamination, velocity,
contamination or deposits inside heat exchangers and mixing installations.