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RG66007169 - Rev 00
5 MICROPROCESSOR
CONTROL
5.6
SET POINT COMPENSATION
Operating setpoint correction depending on outdoor temperature.
COOLING ONLY UNITS
This logic, though not implemented as a standard feature in this type of unit, may be used to reduce its consumption of energy when outdoor temperatures
are less hot, situations in which the demand for cooling may be assumed to be lower. This logic could adjust the setpoint in the following manner:
NB:
the setpoint programmed by the user (par. r1), based on how the temperature offset configuration parameters are defined, will be used without corrections
in low-demand situations.
In other situations, the setpoint actually being used to control the unit will thus not be displayable as a parameter on the controller; such a situation might
however mislead the end user into making an unsuitable setpoint adjustment.
HEAT PUMP UNITS
Such units provide for the offset logic to be used in the heating mode in order to reduce the working setpoint as the outdoor temperature decreases.
The chiller will thus remain within the working range.
Based on the set parameters, the winter setpoint will follow the following logic:
NB:
changing any of the offset parameters in the heating mode will have the effect of changing the entire logic; any such change must thus be studied so
as to avoid unit malfunctioning.
Slope par. r17
par. r19
par. r18
par. r1
15.0
12.0
30.0
35.0
outdoor
temperature (°C)
SetPoint
[°C]
Slope par. r31
par. r20
par. r18
par. r3
45.0
30.0
-10.0
7.0
outdoor
temperature (°C)
SetPoint
[°C]
