Coil
type
Water
range
(ºC)
Room temperature
(ºC)
+15 +18 +20 +22
W2
90/70
1.35 1.28 1.23 1.19
80/60
1.12 1.05 1 0.95
W4
70/50
1.58 1.46 1.39 1.31
60/40
1.20 1.08 1 0.92
50/40
1.06 0.94 0.87 0.79
45/35
0.87 0.75 0.68 0.60
Explanation of technical data
Heating capacity
The maximum heating capacity stated in the tables on page 8, 9 and 10 are based
on a water range of 80/60 °C regarding the 2-row heating coil and 60/40 °C
regarding the 4-row heating coil. If different water or room temperatures are used,
the max. heating capacity may be multiplied by the factors from the table alongside.
Water volume
If different values than the ones stated in the tables on page 8, 9 and 10 are con-
cerned, the water volume may be roughly calculated using the formula below. To do
so, the heating capacity must first be calculated (see table above).
Water pressure loss
If different water temperatures are concerned, the water pressure loss may be rou-
ghly calculated using the formula below. To do so, the water volume must first be
calculated using the formula above.
Sound
The sound data stated in the tables on page 8, 9 and 10 are based on the direct
field, in situations with open doors and sound-absorbing ceilings. Sound data for
other conditions may be determined by adding the following values to the table
values below. Closed door: + 1 à 2 dB(A), and acoustical “hard” ceiling: + 2 à 3
dB(A). For other distances, or for multiple units next to each other, the values below
should be added to the sound data.
∆ p
w
2
= ∆ p
w
1
[kPa]
(
)
2
m
w
1
m
w
2
m
w
=
•3600[ l/h]
Q
ρ
w
C
pw
∆T
w
∆p
w
1
=waterpressureloss,table
values[kPA]
∆p
w
2
=waterpressureloss[kPA]
m
w
1
=watervolume,tablevalues[l/h]
m
w
2
= water volume calculated using
formulaabove[l/h]
m
w
=watervolume[l/h]
Q =heatingcapacity[kW]
ρ
w
=densityofwaterat90°C
(=0.984)[kg/l]
C
pw
=specificheatofwater
(=4.18)[kJ/kg°C]
∆T
w
= temperaturedifferencewater[°C]
Total unit width
Distance 1.0 m 1.5 m 2.0 m 2.5 m 3.0 m 3.5 m
1.0 m +4.8 +6.2 +7.1 +7.6 +8 +8.3
2.0 m +1.8 +3.4 +4.5 +5.3 +6 +6.4
3.0 m 0 +1.7 +2.9 +3.8 +4.5 +5
4.0 m -2.5 -0.8 +0.4 +1.4 +2.1 +2.7
5.0 m -4.4 -2.7 -1.5 -0.5 +0.2 +0.8
CorrectionfactorsindB(A)
11
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