8.3.8 Permanent priority of cooling valve (COOLER)
In dehumidification mode, temperature control calls for warmer air, therefore acting
on the HR system. As a result, the air cooling coil needs more energy to cool the
air again.
Problem
This is prevented by making use of the COOLER function: The cooling valve
function block is assigned to the HR equipment. The cooling valve is given priority.
When the cooling valve is open, the output signal of the HR equipment is set such
that the air temperature after HR is as low as possible.
Solution
The COOLER function is also available for mixing dampers.
Dehumidification and heating in a partial air conditioning system
Example
3140S29de
FO
ZU
AB
AU
Process without cooling valve setting: Process with cooling valve setting:
L
K
3140D23de
L
H
LH
ZU
AB
LK
AU
L
K
3140D24de
L
H
LH
ZU
AB
LK
AU
72 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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