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START UP
Start up
The operations described below must only be carried out by adequately trained personnel. For the contractual warranty to be
valid, commissioning must be carried out by an authorised assistance centre.
Before calling, it is advisable to ensure that all the installation steps have been completed (positioning and levelling the unit, elec-
trical, aeraulic and plumbing connections)
Preliminary checks before switching on
Make sure :
• the unit was not damaged (visual check) due to transport or positioning
• the unit is positioned on a flat surface able to take its weight
• the minimum operating spaces are respected
• the ambient conditions comply with the operating limits provided for
• the air inlet and outlet ducts are properly connected
• the condensate drain connection is correctly carried out
Disconnect the supply line of the unit at the start and make sure :
• the unit's power supply line complies with the current standards
• the screws fixing the electrical cables to the components inside the electrical panel are secured (vibration during tran-
sport may have caused loosening)
Close the electric line disconnecting devices and make sure :
• the supply line voltage complies with the machine's rated voltage
• the unbalance between the phases is less than 2% (a higher value causes excessive current absorption in one or more
phases, resulting in possible damage to the electrical parts of the unit)
NOTE : Phase unbalance calculation example
- Read the value of the three line voltages using a voltmeter :
line voltage between the phases L1 and L2 :
line voltage between the phases L2 and L3 :
line voltage between the phases L3 and L1 :
- Calculate the difference between the minimum and maximum value of the line voltages measured :
- Calculate the mean value of the line voltage :
- Calculate the unbalance percentage value :
Switching on
Close the unit's main disconnecting switch (position I).
A wrong sequence of the power supply phases is immediately detected by the sequence meter (standard on all units) and indica-
ted on the controller display. To eliminate the error invert any two phases of the supply line.
Put the controller on stand-by and check the temperature of the oil in the crankcase of the compressors : the temperature of the
compressor casing, at the bottom, must be at least 8-10°C higher than the outside temperature (with the unit fed and on stand-by
the heating elements take up to 8-10 hours to heat the oil).
Activate the unit in cooling or heating mode by means of the keyboard on the machine and setting a set point requiring 100% of
the unit's power.
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