York YCSA 120 T, Technical Information

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F-r. Software version / language selection
- The version and revised date of the
µ
C3 software is dis-
played.
- The language to be used can be selected with keys Up,
Down and Enter : English or Italian.
Temperature setting
Two different modes are available ( Control Menu ):
1. Setting by means of the water temperature at the ex-
changer
intake
(probe B5).
This mode carries out a proportional type setting based on a
set point and a proportional band divided into 4 stages. This
type of control is included in the controller by default.
It is also possible to carry out a proportional and integral
setting. In this case, this function must be enabled and an
integration set point established (
Control Menu ).
Control sensor: B5 (entering water temperature of the ex-
changer).
Parameters to be used:
- Set point.
- Proportional band for intake setting.
- Type of setting (proportional or propor integral).
- Integration time set point (if the propor integral set-
ting has been enabled).
Control outputs: N1, N6 and N7 (compressor contactors).
Description of operation:
Temperature setting depends upon the average value de-
tected by the probe located at the exchange water intake. It
follows a proportional logic in which the proportional band is
subdivided into four equal stages that give way to compressor
ON/OFF cycles. In propor integral mode, operation is
similar, but affected by an algorithm that takes the time period
into account (
integration time set point parameter ).
STPM Set point
RBM Control band
EIWT Temperature at interchanger intake
C1, 2, 3, 4 Stages/compressors
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