Galletti LCA Series Installation, Use And Maintenance Manual page 22

LCA
GENERALITIES
It is a good idea to carry out periodic checks to ensure that the unit is working properly:
• Check the efficiency of all the control and safety devices as previously described.
• Check the terminals on the electric control board and compressor terminal boards to ensure that
they are securely tightened. The movable and fixed contacts of the circuit breakers must be
periodically cleaned and replaced whenever they show signs of deterioration.
• Check the refrigerant level by means of the liquid level indicator (every 6 months).
• Check the oil levels through the windows provided on the compressor crankcases (every 6 months).
• Check the water circuit for leaks (every 6 months).
• If the unit is to remain out of service for a long time, drain the water from the pipes and heat
exchanger. This is indispensable if during the period of quiescence the ambient temperature is
expected to fall below the freezing point of the fluid used (routine seasonal operation).
• Check whether the water in the circuit needs to be replenished. .
• Check the efficiency of the flow switch or differential pressure switch
• Check the heating elements, where present, of the compressor crankcases.
• Clean the metal mesh filters mounted externally on the water pipes.
• Check the humidity indicator on the liquid level indicator (green=dry, yellow=humid); if the indicator
is not green as shown on the indicator sticker, replace the filter (every 6 months).
• Check that the noise emissions of the unit are regular (every 6 months) and more specifically that no
vibrations and/or knocking can be detected.
REPAIRING THE COOLING CIRCUIT
Warning: while performing repairs on the cooling circuit or maintenance work
on the compressors, make sure the circuit is left open for as little time as
possible. Even if briefly exposed to air, ester oils tend to absorb large
amounts of humidity, which results in the formation of weak acids.
If the cooling circuit has undergone any repairs, the following operations must be carried out:
tightness test;
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emptying and drying of the cooling circuit;
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charging with refrigerant.
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If the system has to be drained, always recover the refrigerant present in the circuit
using suitable equipment; the refrigerant should be handled exclusively in the liquid
phase.
RG66000986 – Rev.00 22