Maximum economy changeover (MECH), (cont’d)
For that purpose, MECH input 1 (MECH 1) must be assigned a digital input. Possibility 1: Changeover
from externally via a
digital signal
Function with TYPE = ERC:
When controlled via the heating sequence:
Normal position => no inversion of HR output (HREC)
Operated position => inversion of HR output (HREC)
When controlled via the cooling sequence:
Normal position => inversion of HR output (HREC)
Operated position => no inversion of HR output (HREC)
DI
DIG
0 %
SETCOOL
0 %
CTLOOP 1
y1 y2
HREC
HREC
Changeover via an external actuating device (digital input).
Application example
65 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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