Economizer function for cooling-load savings
To save energy on cooling-load, the energy recovery control signal can be reversed.
The reversing procedure supported by the control strategy depends on temperature.
With the setting SYS-01 economizer function, the user can select the following options:
- SYS-01 = 0 disable the function or use an external signal connected to the input EnRecSeqSwitch, for enthalpy override. If "EnRecSeqSwitch" = 1, the the energy recovery sequence will be reversed.
- SYS-01 = 1 economizer mode with room temperature
- SYS-01 = 2 economizer mode with return temperature
The energy recovery sequences will be reversed if the
- room temperature is above the value of the calculated room temperature setpoint and
- outside air temperature is higher than the room temperature plus 2K
(room temperature sensor connected to input RoomRetAirTemp).
The energy recovery sequences will be reversed if the
- return air temperature is above the value of the calculated room temperature setpoint and
- outside air temperature is higher than the return air temperature
(return air temperature sensor connected to input RoomRetAirTemp).
Note: Air quality control override (CO2) has a higher priority than the economiser function.
Description
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Default value
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SYS-01: economizer function
0 = disable
1 = room temp
2 = return temperature
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1
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