Swegon GLOBAL PX Operation And Maintenance Instructions page 20

5.4 COOLING RECOVERY (RX ONLY)
The cooling recovery function uses the lower extract air temperature to cool down the fresh air. The function is not
configurable. If there is a cooling load in the building and the temperature in the extract air is lower than the outdoor
air temperature, the heat exchanger shall be automatically controlled to operate at maximal speed. The temperature
setpoint is configured in the base setup and the rotary heat exchanger will modulate in order to maintain the setpoint.
The cooling recovery operates according to the logic below:
Cooling recovery STARTS if the following condition is TRUE :
•
The outdoor temperature (sensor T1) is higher than the extract air temperature (sensor T2).
5.5 CHANGE OVER FUNCTION
4 PIPE AUTOMATIC CHANGE OVER
The TAC5 controller allows for the control of both cooling and heating coil. Both coils are equipped with their motorised
3-way valves. The offset between the measured temperature (supply air or extract air, to be configured) and the
setpoint will determine if heating or cooling is automatically activated. When the unit is equipped with both a cooling
and a heating coil, only one setpoint has to be configured: Comfort temperature. The neutral band prevents the cooling
and heating systems from counteracting each other. The high neutral band is added to the comfort setpoint for the
activation of the cooling function and the low neutral band is subtracted from the comfort setpoint for the activation of
the heating function. Both high and low neutral bands have to be configured in the advanced setup.
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Operation and maintenance instructions – v2.8.8 & 2.7.3