OI_EC2-XC645CX_A1_A2L_A3_EN_Rev01_866933.docx EC2-XC645CX 36/54
18.2 Proportional band regulation - only for fans
The fan regulation band Pb is divided by the number of fans:
The numbers of fans switched ON is proportional to the value of the input signal: when this
distances itself from the target set point and enters the various bands, the compressors are
switched ON, to be then turned OFF when the signal brings near the set point.
In this way if the pressure is greater than regulation band, all the fans are on, if the pressure
(temperature) is lower than the regulation band all the fans are off.
Naturally also for this regulation all the delays (Fon and FoF) are valid.
Regulation according to the running hours
The algorithm switches on and off the loads according to the running hours of each load. In this
way the running hours are balanced.
Example
4 Fans: oA2 = FAn; oA3 = FAn; oA4 = FAn; oA6 = FAn: rot = yES rotation enabled
F1
F2
F3
F4
SETF
Set+Pb/2
Set-Pb/2
ZIC
Set+Pb/4
Set-Pb/4
Fon
FoF
ALL LOADS ON
ALL LOADS OFF
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