Maximum economy changeover (MECH), (cont’d)
Possibility 3: Changeover
at an adjustable
difference
To achieve changeover at an adjustable difference between 2 measured values,
you must assign one analog input each to MECH input 1(MECH 1) and MECH
input 2 (MECH 2).
Function with TYPE = ERC:
When controlled via the heating sequence:
When the set MECH difference (MECHSET) is exceeded, the output of the HR
equipment (HREC) will be inverted.
When controlled via the cooling sequence:
When the set MECH difference (MECHSET) is exceeded, the output of the HR
equipment (HREC) will no longer be inverted.
X1
ROOM
X2
OUTS
0 %
CTLOOP 1
y1 y2
HREC
HREC
HR
Examples of changeover at an adjustable difference:
Application examples
• Changeover at a temperature difference of:
Outside temperature minus room temperature ≥3 K
• Changeover at a temperature difference of:
Outside temperature minus exhaust air temperature ≥2 K
67 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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