3.3. Parameters for the temperature control
C10 determines the differential. The differential is the value in ° C which, added or subtracted from the set-
point value, switches the air conditioner off or on. Increasing the differential increases the fluctuation of the
room temperature, because the air conditioner will perform longer cycles both in operation and in standstill.
C30 - C40 when the air conditioner is operating in A - automatic mode, the choice between Cool mode and
Heat mode is made by comparing the measured room temperature with the value set by the set-point. This
occurs when the air conditioner is switched on and is determined by the differential. If at the time of power-up
the room temperature is higher than the set-point value + the differential, the air conditioner starts in Cool
mode. If, instead, the room temperature is lower than the set-point minus the differential, then the air
conditioner starts in Heat mode. Parameters C30 and C40 becomes active once the air conditioner is already
working. To prevent particular conditions from changing the operating mode (from Cool to Heat) due to a small
temperature difference, the values of C30 and C40 are by default 2 and can be increased if necessary to avoid
oscillations of the air conditioner.
C95 allows you to intervene on the temperature detected by the external probe (if installed)
C96 the internal probe is incorporated in the MK2 panel. The area where the probe is installed undergoes a
progressive heating in the first 5 minutes from switching on. The heating is automatically compensated by
the panel with the value of 4.3 ° C at each power-up. Once powered, the temperature value remains correct.
If the panel is disconnected for a short time, the temperature read will be slightly higher because the
correction intervenes gradually in the first 5 minutes.
3.4. Parameters for the fan speed control
C20 - the PAR parameter determines the behavior of the fan when the room temperature approaches the set
point value and the fan operating mode is A-automatic. The PAR value is added to the value of the
differential C10 to determine the temperature at which the fan begins to reduce the speed. Example: set
point = 22 ° C, C10 = 1 e. C20 = 2. The reduction of the speed in the cooling cycle (cool) starts at 22 + 1 + 2
= 25 ° C.
The PAR value also determines the temperature range in which the fan passes from maximum to minimum
speed. Then continuing the same example, the fan speed changes from v8 to v7 at 24.9 ° C and gradually
decreases until it reaches v1 at 23 ° C. The air conditioner will continue to operate with the fan at minimum
until the set-point value is reached. When the set point is reached, the air conditioner will stop cooling. In the
heating cycle the behavior is the same but of course the set point is reached with an increase in
temperature.
