Maintenance ESIE10-01
5–6 Part 5 – Maintenance
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N.B.:
1. Monthly activities include all weekly ones.
2. Yearly (or early season) activities include all weekly and monthly activities.
3. Machine operating values should be read on a daily basis thus keeping high observation stand-
ards.
4. Bank cleaning may be necessary more frequently in environments with a high percentage of
particles in the air.
5. Replace the oil filter when the pressure drop reaches 2.0 bar.
6. Check for any dissolved metals.
7. TAN (Total Acid Number):
• ≤ 0.10: No action.
• Between 0.10 and 0.19: Replace anti-acid filters and check after 1,000 running hours. Con-
tinue to replace filters until the TAN is lower than 0.10.
• > 0.19: Change oil, replace oil filter and filter dryer. Check at regular intervals.
Filter dryer
replacement
It is strongly recommended that the filter dryer cartridges be replaced in the event of a considerable
pressure drop across the filter, or if bubbles are observed through the liquid sight glass while the
subcooling value is within the accepted limits.
Replacement of the cartridges is advised when the pressure drop across the filter reaches 50 kPa with
the compressor under full load.
The cartridges must also be replaced when the humidity indicator in the liquid sight glass changes
colour and shows excessive humidity, or when the periodic oil test reveals the presence of acidity (TAN
is too high).
Check refrigerant flow using the liquid sight glass - Sight glass
full
X
Check filter dryer pressure drop X
Check oil filter pressure drop (Note 5) X
Analyse compressor vibrations X
Analyse compressor oil acidity (7) X
Condenser section:
Clean the condensation banks (Note 4) X
Check that the fans are properly fastened X
Check the bank fins - Comb if necessary X
List of activities Weekly
Monthly
(Note 1)
Yearly
(Note 2)
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