Carrier 30WI Manual page 87

16 - CONTROLS
► In heating mode :
- A call will be made to turn on the compressor if T < STP + Stage differential
- The compressor rotation speed will be progressively increased if (STP - Stage differential - Interstage differential) < T < (STP -
Stage differential)
- The compressor will be shut off as soon as T > STP
Conversely, the compressor speed will be progressively decreased as the water return temperature approaches the setpoint value
The temperature used to adjust the setpoint is measured by the sensor on the water outlet or inlet of the heat exchanger based on
the value of P141.
► In cooling mode :
10V 90 Hz
STP = Setpoint
0V 30 Hz
► In heating mode :
10V 90 Hz
0V 30 Hz
0 Hz
■ Csg = STP
► Correction management:
Correction is enabled if P7 = Inverter and if P141 = supply and return.
The correction factor is used to prevent the compressor from running during short-cycle protection and too-short runtimes caused by
a lack of inertia in the system.
The correction factor On/Off button is set to '0' at power-up.
0 Hz
Csg Csg + P143
P251
Csg - P143 Csg - P143
- P144
- correction
Corrected slope
Csg + P143
+ P144
Corrected slope
- P144
Csg + P143
+ P144
+ correction
Csg - P143 Csg
P251
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