York YCSA 120 T, Technical Information

Page: 43 / 48

43
2. Setting by means of the water temperature at the ex-
changer
outlet
.
Thermostatic control is based on the temperature value
detected by probe B6.
The set point value (STPM) and the regulating band (RBM)
define a neutral temperature zone (NZ).
- The temperature values comprised between the set point
and the set point plus the band (STPM
≤
Temperature
≤
STPM + RBM) do not cause compressor ON/OFF cy-
cles.
- Temperature values above the set point plus the band (Tem-
perature > STPM + RBM) cause compressor operation.
- Temperature values below the set point (Temperature
< STPM) turn the compressors off.
The compressor ON/OFF process is governed by a variable
delay period.
As of the time differential calculated as a delay, and in accord-
ance with the average temperature for probe B6, the control
system modulates ON/OFF cycles of the compressors.
If value 0 is set, the minimum delay increase/decrease time
of a call for power disables this function.
There is a differential temperature, which is different for opera-
tion in heat or cool cycle (below or above...), that turns off all
devices installed to avoid excessive heating/cooling.
STPM Set point
RBM Control band
NZ Neutral zone
EOWT Water temperature at exchanger outlet
DonZ Compressor ON zone
DoffZ Compressor OFF zone
TVD Differential of phase input/output time variations
HTON Stage activation maximum time delay
LTON Stage activation minimum time delay
HT OFF Stage deactivation maximum time delay
LT OFF Stage deactivation minimum time delay
t
Time
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