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Water after-heating element Ø125

An after-heating element is often installed if you want to be able to control the supply air temperature. A low supply air temperature may, at times, feel like a draught. By ensuring that the supply air temperature does not fall below a certain level, you achieve a good, comfortable indoor climate.  

The water after-heating element is for duct mounting and should be connected to the primary heat supply. 

Duct connections Ø125 mm with rubber gasket
Automation 0-10V signal
Airflow > 1,5 m/s
Max. air temperature 50 ºC
Plate type Aluzinc steel plate
Tightness class IP44
Safety thermometer 2 pcs.

The heating element is only intended for heating up clean air.

Calculation of correct heating element​:

Δt * air density * air volume [m3/h]

E.g. 1: No pre-heater mounted. The temperature must be raised from -10 ºC to 21 ºC at 100 m3/h.

31 * 0,34 * 100 = 1054 W

As a minimum, the heating element must be able to supply​ 1054 W

E.g. 2:  A pre-heater is mounted. The temperature must be raised from 16 ºC to 21 ºC at 100 m3/h.

5 * 0,34 * 100 = 170 W

As a minimum, the heating element must be able to supply 170 W

 

Water side Air side
Temperature
input/output
[ºC]		 Flow
[m3/h]		 Pressure drop
[kPa]		 Output
[W]		 Airflow
[m3/h]		 Temperature
before WHE*
[ºC]		 Temperature
after WHE*
[ºC]		 Pressure drop
over WHE*
[Pa]
40/30 0,04 0,85 520 100 16 31,1 2
40/30 0,06 1,25 640 135 16 29,8 3
40/30 0,08 2,18 870 210 16 28,1 6
60/40 0,04 0,69 940 100 16 43,5 2
60/40 0,05 1,00 1160 135 16 41,1 3
60/40 0,07 1,75 1580 210 16 38,0 6
70/40 0,03 0,40 1060 100 16 47,0 2
70/40 0,04 0,58 1300 135 16 44,2 3
70/40 0,05 1,00 1760 210 16 40,5 6

*Water after-heating element

 

It is important that the temperature sensor T7 is placed at least 50 cm after the after-heating element in order to achieve efficient regulation.

ATTENTION! The heating element must be insulated in order to avoid frost damage. 
 

Electrical connection:

Water connection:

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