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IMPORTANT
If the machine is not supplied with a built-in pump, do not shut down the external pump before 3 minutes have
elapsed after the last compressor has shut down. Early shutdown of the pump triggers a water-flow failure alarm.
Seasonal shutdown
1.
Turn switches Q1 and Q2 to the Off (or 0) position to shut down the compressors, using the normal pump-down
procedure.
2.
After the compressors have been shut down, turn switch Q0 to the Off (or 0) position and wait for the built-in water
pump to shut down. If the pump is managed externally, wait for 3 minutes after the compressors have shut down
before turning off the pump.
3.
Open the Q12 thermal-magnetic switch (Off position) inside the control section of the electrical board and then open
the general disconnecting swi
tch Q10 to cut off the machine’s power supply entirely.
4.
Close the compressor intake valves (if any) and delivery valves and also the valves located on the liquid and liquid
injection line.
5.
Place a warning sign on every switch that has been opened, advising to open all the valves before starting the
compressors.
6.
If no water and glycol mixture has been introduced into the system, discharge all the water from the evaporator and
from the connected piping if the machine is to remain inactive during the winter season. One must remember that
once the machine’s power supply has been cut off, the anti-freeze electrical resistance cannot function. Do not
leave the evaporator and piping exposed to the atmosphere during the entire period of inactivity.
Starting up after seasonal shutdown
1.
With the general disconnecting switch open, make sure that all the electrical connections, cables, terminals and
screws are well tightened to ensure good electrical contact.
2.
Verify that the power supply voltage applied to the machine is within
10% of the nominal nameplate voltage and
that the voltage unbalance between the phases is no within
3% range.
3.
Verify that all control devices are in good condition and functioning and that there is a suitable thermal load for start-
up.
4.
Verify that all the connection valves are well tightened and that there are no refrigerant leaks. Always reposition the
valve covers.
5.
Verify that switches Q0, Q1, Q2 and Q12 are in the open position (Off). Turn the general disconnecting switch Q10
to the On position. Doing this will allow to turn on the electrical resistances of the compressors. Wait at least 12
hours for them to warm up the oil.
6.
Open all suction, delivery, liquid and liquid injection valves. Always reposition valve covers.
7.
Open the water valves to fill the system and vent the air from the evaporator through the vent valve installed on its
shell. Verify that there are no water leaks from the piping.
