EN-10
During operation with a constant supply air temperature, free cooling is inactive as the heating coils are still in use
(except on the deadband).
When operating in free cooling mode, the supply air temperature is not controlled. It is important to configure an
outdoor temperature low limit (screen p17) which is sufficiently high to ensure no discomfort is caused.
1.10 Control unit for rotary heat exchanger
The control unit is a frequency transformer equipped with additional functions that are needed to ensure optimum
operation of a rotary heat exchanger.
Its number of revolutions and degree of efficiency are set by the controller so that the number of turns of the rotor is
proportional to the 0-10 V input signal.
1.10.1 Functions built into the control unit
Purging
The heat exchanger turns at the min. number of revolutions for 10 sec. every 30 minutes if
the input signal is below the threshold value, i.e. the rotor is stopped. The function can be
deactivated.
See the DIP transformer setting.
Rotation monitor
The rotation monitor (a magnet mounted on the rotor with a magnetic transmitter) switches
off the transformer and emits an alarm in case of a broken belt or similar incident. The control
unit is activated unless a pulse is received every 5 minutes. The function can be deactivated.
See the DIP transformer setting.
The control unit has a threshold value set to 0.1 V.
The rotor stops if the input signal is less than this value.
Reset
Via the reset button or in case of power loss.
Automatic start-up after power loss.
Controller inputs and outputs
This description concerns Classic and Classic RHE units.
For Vertical or Ceiling-Mounted units, the descriptions are in Italics.
Connector J1
G 24Vac
G0 Shared
Connector J2
B1 Pressure sensor B1 for return air (supply) filter fouling level
The pressure sensor monitors the level of blockage in the filter. If the filter is clogged,
the unit is shut off and the corresponding faults are displayed and the LED lights up. If
the filter is dirty, the corresponding fault is displayed and the LED lights up, but the unit
B2 Flow rate sensor B2 for return air (supply) fan
The return air fan flow rate sensor compensates for filter fouling and ensures a
constant fan flow based on the setpoint.
A difference of up to 10% is possible between the flow rate indicated by the controller
and the actual unit flow rate. It is due to the accuracy limit of the sensor and to the air
handling unit's system effect.
B3 Flow rate sensor B3 for supply air (return) fan
The supply air fan flow rate sensor compensates for filter fouling and ensures a
constant fan flow based on the setpoint.
A difference of up to 10% is possible between the flow rate indicated by the controller
and the actual unit flow rate. It is due to the accuracy limit of the sensor and to the air
handling unit's system effect.
GND Shared
+VDC Power supply for enabled sensors
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