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Pre-startup checks
General
Once the machine has been installed, use the following procedure to check that is has been done properly:
ATTENTION
Switch off the power supply of the machine before performing any checks.
Failure to respect these rules at this stage can result in serious injury to the operator or even death.
Inspect all the electrical connections to the power circuits and to the compressors including the contactors , fuse carriers
and electrical terminals and check that they are clean and well secured. Even though this is done at the factory to every
machine that is shipped, vibrations from transport could have loosened some electrical connections.
ATTENTION
Check that the electrical terminals of cables are well tightened. A loose cable can overheat and give rise to problems
with the compressors.
Open discharge, liquid, liquid injection and intake (if installed) taps.
ATTENTION
Do not start up the compressors if the exhaust, liquid, liquid injection and intake taps are closed. Failure to open these
taps/ valves can cause serious damage to the compressor.
Place all the thermal-magnetic switches of the ventilators ( from F16 to F20 and from F26 to F30) on the On position.
ATTENTION
If all fan circuit breakers are kept off, both compressors will block due to high pressure when the machine is started up
for the first time. Resetting the high-pressure alarm requires opening the compressor compartment and resetting the
mechanical high-pressure switch.
Check the power supply voltage at the general disconnect switch terminals. The power supply voltag e must be the same
as that on the nameplate. Maximum allowed tolerance
10%.
Voltage unbalance between the three phases must not exceed
3%.
The unit comes with a factory-supplied phase monitor that prevents compressors from starting in the event of an
erroneous phase sequence. Properly connect the electrical terminals to the disconnector switch so as to ensure alarm -
free operation. In the even that, after the machine has been powered on, the phase monitor should set off an alarm, only
invert two phases at the general disconnect switch input (Unit input). Never invert the electrical wiring on the monitor.
ATTENTION
Starting up with the wrong sequence of phases irreparably compromises operation of the compressor. Ensure that
phases L1, L2 and L3 correspond in sequence to R, S and T.
Fill the water circuit and remove air from the system’s highest point and open the air valve above the evaporator skirt.
Remember to close it again after filling. The design pressure on the wter side of the evaporator i s 10.0 bars. Never
exceed this pressure at any time during the life of the machine.
