Galletti LCP Series Installation, Use And Maintenance Manual

Galletti LCP Series Installation, Use And Maintenance Manual Manual pdf 28 page image

LCPRG66006889-Rev.01 2810.2 GENERALITIESIt 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 theyare securely tightened. The movable and fixed contacts of the contactors must be periodicallycleaned 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). Check the filling of the water circuit, bleeding air from the circuit by means of the valves situated inthe highest points. 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 isnot 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 novibrations and/or knocking can be detected.Galletti S.p.A.. is not responsible for inexact translations of the manual in languagesother than English.10.3 REPAIRING THE COOLING CIRCUITWarning: while performing repairs on the cooling circuit or maintenance work onthe 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;- emptying and drying of the cooling circuit;- charging with refrigerant.If the system has to be drained, always recover the refrigerant present in the circuit usingsuitable equipment; the refrigerant should be handled exclusively in the liquid phase.10.4 TIGHTNESS TESTFill the circuit with anhydrous nitrogen supplied from a tank with a pressure-reducing valve until thepressure rises to 10 bar.During the pressurisation phase, do not exceed the pressure setting of the safety valves;otherwise you will cause the latter to open.The presence of any leaks must be determined using special leak detectors. Should any leaks bedetected during the test, empty out the circuit before repairing the leaks with suitable alloys.