12
.
2.42
Katherm QE –
Tangential fan convection with electric heating element
Ready-to-install convector-based floor trenches
Assembly and installation instructions
10.1 Control
Connect the units via a PCB in the electrical junction box.
Wire the unit as per the wiring diagram.
The cable types and cable cross-sections to be installed are defined by an authorised
electrician, as the cable cross-sections are essentially dependent on the electrical fuse,
cable length and type of installation on site.
Every Katherm QE trench heater is fitted with an integral power control for the electric
heating element and the EC tangential fan.
Power control is provided by PWM actuation and is proportional to the active 0...10 VDC
input signal. Room temperature control can be provided by a room temperature control
or a building management system.
Group control of several trenches is possible without the need for additional accessories.
The Katherm QE should be connected or switched in parallel in accordance with VDE
0100 / IEC 60364-1. The discharge current often produced when using EC fans is 0 mA
and thus complies with the applicable IEC EN 60355-2-40.
10.2 Control strategy
With a control signal of 2 V, the EC tangential fan is operated at minimum speed and
the electric heating element with minimum heat output.
When the control voltage is increased, the speed of the
EC tangential fan and the heat output of the electric heating element is proportionately
increased. The ideal electrical heat output is thus provided for every volumetric flow.
Energy-optimised heating operation is guaranteed by the infinitely variable adjustment
of the electric heating element to the room heat requirement.
0
2
4
P
max
P
min
6
8
10
Steuerspannung GLT [V]
Elektr
oheizleistung
Electric heating output
Control voltage BMS [V]
Summary of Contents for Katherm QE
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