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Heat recovery function
with thermal wheel heat
exchanger
Layout and function of
the TWHE control unit
Function with rapid heat-up
operating mode
(optional for CRL-1300/-2500/-
3500)
32
16. Commissioning
A rotating accumulator mass (rotor material corrosion-resistant aluminium alloy,
wound in corrugated and smooth layers) absorbs heat from the extract air flow
and transfers it to the outdoor air. The rotor mass is sealed by a circumferential
labyrinth seal. Output is controlled by varying the speed of the drive motor. Force
is transmitted from the motor to the rotor by a circumferential V-belt. There is
no need for frost protection, a defrosting device or air preheating.
The MicroMax 370W rotor control unit includes the following functions:
- Automatic interval mode
- Variable speed control
- Acceleration and deceleration ramp
- Motor brake on standstill
Rotor
- Rotation monitor with rotation sensor
control unit
- Alarm relay
- Test switch
In principle, the thermal wheel heat exchanger is maintenance-free.
Rotor
The rotational direction of the TWHE has no effect on heat recovery. When
motor
the TWHE control unit is switched off, interval mode ensures further rotation
in order to prevent fin soiling.
100 % of the extract air flows over the rapid heat-up damper and is routed directly
back into the room. In order to achieve the required set room temperature as
quickly as possible, the air temperature is raised to a maximum via a reheating
coil.
In this operating mode, the ODA and EHA dampers are completely closed; the
ETA fan and heat recovery (TWHE) are not operational. The SUP fan is running
and delivers the required flow rate.
When the set room temperature has been achieved, the unit switches back
into standard control mode.
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