Gattetti LCA User Manual page 18

In capacity-controlled compressors, the functioning logic is as follows:
Request Compressor contactor
Start-up:
OFF disenergized
Capacity-controlled energized
Full load energized
OFF routine:
Full load energized
Capacity-controlled energized
OFF disenergized
Upon request of full load start-up, the capacity-controlled solenoid valve energizes; after 2 seconds the compressor relay will
be actuated. When the "c4" time-delay has passed (time-interval between compressor activation and relative capacity-
controlled routine) the solenoid valve will disenergize.
r3: Heating set-point
It allows to set the Heating set-point (reverse).
r4: Heating differential
It allows to set the Heating differential.
Cooling functioning mode – 2 compressors or capacity-controlled routine
r5: Compressors rotation
This function makes it possible to activate the compressors so as to balance their operating hours. They are actuated
according to a "FIFO" (first in first out) logic, both at start-up and when the compressor turns off (the first to be turned on
will be the first to be turned OFF. The first to be turned OFF will be the first to be turned on).
r6: Water temperature @ evaporator output circuit no.1, B2
It displays the temperature at evaporator outlet in circuit no. 1 (B2).
RG66000889-REV.OO
Heating functioning mode -1 compressor
Winter Set Point + differential
Winter Set Point + differential
Cooling functioning mode ON/OFF probe
Compressor
Close contact
Partialization solenoid valve
disenergized
energized
disenergized
disenergized
energized
disenergized
Winter Set Point
Winter Set Point
Open contact
18