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IMPORTANT
If the machine is not supplied with an onboard 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
Turn switch Q1 to the Off (or 0) position to shut down the compressors, using the normal pumpdown procedure.
After the compressors have been shut down, turn switch Q0 to Off (or 0) and wait for the built -in water pump to shut
down. If the water pump is managed externally, wait for 3 minutes after the compressors have shut down before turning
off the pump.
Open the Q12 (Off position) thermal magnetic switch inside the control section of the electrical board then open the
general disconnector switch Q10 to cut off the machine’s power supply entirely.
Close the compressor intake taps (if any) and delivery taps and also the taps located on the liquid and liqui injection line.
Place a warning sign on every switch that has been opened, advising to open all the taps before starting the
compressors.
If no water and glycole mixture has been introduced into the system, di scharge 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 antifreeze electrical resistance cannot func tion. Do not leave the
evaporator and piping exposed to the atmosphere during the entire period of inactivity.
Starting up after seasonal shutdown
With the general disconnector switch open, make sure that all the electrical connections, cables, terminals and screws
are well tightened to ensure good electrical contact.
Verify that the power supply voltage applied to the machine is within
10% of the nominal nameplate voltage and that
the voltage unbalance between phases is between
3%.
Verify that all control apparatus is in good condition and functioning and that there is a suitable thermal load for startup.
Verify that all the connection valves are well tightened and that there are no refrigerant leaks. Always reposition the valva
caps.
Verify that switches Q0, Q1 and Q12 are in the open position (Off). Turn the general disconnector switch Q10 to the On
position. Doing this will allow to turn on the electrical resistances of the compressors. W ait at least 12 hours for them to
start up.
Open all intake, delivery, liquid and liquid injection taps. Always reposition tap covers.
Open the water valves to fill the system and bleed air from the evaporator through the air valve installed on its shell.
Verify that there are is no water leakage from piping.
