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11 OPERATOR RESPONSABILITIES
It is important that the operator is properly trained and familiar with the equipment before working on the unit. In addition
to reading this manual, the operator must study the manual operation of the microprocessor and the wiring diagram to
understand the sequence of start- up, operation, shutdown sequences, and the criterion of operation of all safety
devices. During the initial start-up of the unit an authorized technician is available to answer any questions and educate
on the proper functioning. We recommend the operator to maintain a record of the operating data for each unit installed
and all maintenance activities and periodic service. If the operator observes abnormal or unusual operating conditions,
consult the authorized service technician.
12 START-UP PRELIMINARY PROCEDURES
12.1
STARTING CHECK
With the general switch open, check that the electrical connections are tightly clamped. Check for any possible refrigerant leaks.
Check that the electrical data on the label correspond to those of the mains supply. Check that the thermal charge available is
appropriate for starting.
12.2
REFRIGERANT SEALS CONTROL
RAUS and RAUX units are shipped void of refrigerant, pressed with nitrogen and with pipes plugged (shut-off valves are
an option).
If the system, after charging it, were not under pressure, blow refrigerants (vapour) into it until pressure is reached and
look for leakage.
After having eliminated the leakage, the system has to be dehydrated with a vacuum pump up to at least 1mm Hg -
absolute pressure (1 Torr o 133.3 Pa). This is the minimum recommended value to dehydrate the plant.
Danger
Do
not use the compressor to vacuum the system.
12.3
REFRIGERANT CHARGE CHECK
When the unit is working and bubbles can be seen through the peephole with the compressor running with a full charge
and steadily, it means that the refrigerant charge is insufficient.
