a) GENERAL REMARKS:
The electrical panel of the units has been designed to simplify inspection and maintenance services. Access to the electrical panel is obtained by removing its closing panel. The drive and protection elements of the equipment are located there.
There is a terminal for the power wiring and the control circuit is input to the control fuses. The “earth” terminal is also included beside the power terminal.
The power package (counter + overload relay + accessories) of the evaporator fan is supplied with the ventilation module and must be mounted on the electrical panel when installing. See wiring diagrams.
The electrical panel of the condenser is dimensioned to support the total current of the two capacitors of each unit, thus enabling the power connection of the 2nd condenser to be connected to the electrical panel of the 1st.
b) PRESSURE SWITCHES
The low and high pressure switches are miniaturized, with automatic reset, and are directly coupled to the suction and discharge lines respectively.
Regardless of whether the reset is automatic or manual, when disarming the refrigerator circuit it is blocked by the CLO (S). The trip values for these pressure switches are indicated in the manufacturer's manual.
c) CLO (LOCK-OUT COMPRESSOR)
The CLO is a protection device against automatic compressor cycling when shutting down by safety elements (high or low pressure switch, Line Break, internal thermostat and overload relay). It is located inside the electrical panel of the units. It exists in all units.
The CLO monitors the current that passes through the sensor loop, whether or not triggering a relay if the logic condition is false or true. After shutdown by the protection device, the CLO prevents automatic restarting when the situation normalizes, thus preventing the compressor from cycling. A current below 4A ± 1 through the sensor loop opens the normally closed contact between terminals 2 and 3 of the CLO. Terminals 1 and 2 are for the 24V ± 10% power supply on all units. Once the cause of the trip has been verified and remedied, the reclosing (RESET) can be done by turning the unit off and on at the thermostat / control switch or by restoring power through the sensitive loop.
