12
MAINTENANCE
It is advisable to make maintenance visits every 1000
hours of the system operation, or every cooling sea-
son.
During every visit check the following
DRAIN: If drain pan is clean, water drain is not ob-
structed, and water can flow from the drain pan, drain
pipe and the trap.
AIR FILTERS: Clean the filters after 4 hours of sys-
tem operation and every 3 months, or more often de-
pending on the application. Clean filters elements by
immersing in warm water detergent solution, rinse
with clean water and carefully dry before installing
them in their place.
CENTRIFUGAL FANS: Check and adjust belt trans-
mission every 15 days during the first month from the
start up and later every 1000 hours. Motor and fan
have self lubricating bearings and do not need addi-
tional lubrication.
REFRIGERATION CIRCUIT: Check for refrigerant
and oil leaks in the system, or for vibrations and com-
pressor unusual noises. Take note of operating pres-
sures.
When the system is running and that symptoms of re-
frigerant charge loss are detected (abnormal low cool-
ing capacity or low pressure pressostat tripping), it is
necessary to make a leak test. If result is not satisfac-
tory follow with gas tightness test using compressed
nitrogen. It has to be performed by an experienced
service technician. First all refrigerant must be re-
moved from the circuit and stored in a tank.
IMPORTANT: Never use the compressor as a vacuum
pump. If more refrigerant is needed add gas very slowly
via the suction line. Liquid refrigerant must never be
introduced into the suction line. Fill in the refrigerant
charge indicated in the nameplate, plus the required
charge for the refrigerant lines, if the system is a split
system.
ELECTRICAL CIRCUIT: Make sure that there are
no faulty terminals or contactors, etc..
Be sure that all electrical connections are properly
tightened. Take measurements of the tension and
amperage of each phase and check if they are within
operation limits of the unit. Check the operation of all
the relays, high and low pressure pressostat, etc..
When unit has scroll compressors check if phases se-
quence safety relay is working properly.
CONDENSER COILS: Once a year clean condenser
coils (use water detergent solution, dry with air at the
pressure of around 6 bars). Never use for coil cleaning
the wire brush.
ATTENTION
Never switch off or disconnect the power supply of the compressors
crankcase heaters.
If, for any reason it is necessary to shut down the complete installa-
tion, first stop the compressors operation by selecting the "OFF" po-
sition on the thermostat, then disconnect the main power supply.
After a shut down period of some days it is mandatory to energise
the crankcase heater for a period of at least 24 hours before new
compressor start up.
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