8.3.5 Maximum economy changeover (MECH)
The purpose of this function is to optimize the control of the HR in air conditioning
systems with regard to operating costs. It compares the available energy in the
outside air and exhaust air, and switches the inversion accordingly.
Purpose
To activate the maximum economy changeover (MECH) function, assign the
corresponding inputs during configuration:
Activation
– MECH 1 (MECH input 1)
– MECH 2 (MECH input 2)
The following 3 changeover possibilities are available:
3 changeover
possibilities
• Changeover from externally via a digital signal
• Changeover at an adjustable value
• Changeover at an adjustable difference between 2 measured values
Special application examples:
• Changeover from externally via a digital signal with air damper as first cooling
sequence
• Changeover at an adjustable difference with air damper as first cooling
sequence
The 3 possibilities and the 2 special application examples are explained on the
following pages.
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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