Maintenance; Type And Frequency Of Routine Maintenance; Maintenance Of The Cooling Circuit - HL -i Series Use And Maintenance Handbook

EXTERNAL AIR TEMPRATURE:
To ensure the unit can properly perform cooling, the external air temperature must be between -15°C and 40°C. For
different requirements please contact our Engineering Division.
NOTE: Using the unit improperly forthwith voids the guarantee; moreover it may cause unit failures and the
tripping of safety devices
NOTE: If the unit is installed outdoors, it is recommended that a min. 15% of glycol is added into the water circuit..

MAINTENANCE

IMPORTANT:
BEFORE ANY OPERATION INSIDE THE UNIT TURN OFF THE MAIN SWITCH UPSTREAM
THE UNIT POWER LINE. THEN OPEN THE FRONT PANEL AND TURN OFF THE UNIT MAIN SWITCH TOO.
IMPORTANT:
ONLY OUR TRAINED TECHNICIANS ARE DULY QUALIFIED TO SERVICE THE UNIT
WHEN POWER IS SUPPLIED TO THE ELECTRICAL BOARD AND THE PANEL IS OPEN. IN THESE
CONDITIONS SOME OF THE SYSTEM FUNCTIONS ARE NOT PRESENT.

TYPE AND FREQUENCY OF ROUTINE MAINTENANCE

Periodical maintenance is a good practice to check if the unit works properly.
Please note that these services, including possible maintenance operations, should be carried out by qualified
personnel only.
Every month:
─Check if the electrical terminals on the electric board and on the terminal boxes of the various electric parts are
correctly clamped;
─Check if the contacts of the remote control switches are clean and in sound conditions (if necessary, replace
them);
─Check if the water circuit is uniformly filled (no air inside of it);
─Check if the water differential pressure switch operates correctly;
─Clean fins of condensing coil by blowing compressed air or, if necessary, flushing them with water (operate in the
opposite direction with respect to airflow);
─Check if the defrost procedure is correctly performed.
If, after a few working hours, the unit makes anomalous noises an extraordinary check shall be carried out to detect
and eliminate their causes.

MAINTENANCE OF THE COOLING CIRCUIT

IMPORTANT: During any operation requiring the cooling circuit to be exhausted, it is necessary, to ensure
environmental safety, that the gas is collected into a proper receiver.
After the cooling circuit is repaired, carry out the following operations:
─Tightness test;
─Cooling system draining and drying;
─Refrigerant charge.
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