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10 - MAINTENANCE
Dryer fi lter
● The fi lter function is the preserve the cooling circuit clean and
without humidity, neutralizing the acids that can be found in
the cooling circuit.
● Measure the diff erence in the temperature of the pipes at the
dryer inlet and outlet.
● If necessary, replace.
Liquid sight glass
● This sight glass, located on the liquid line, after the dehydrating
fi lter, enables controlling the refrigerant load and the presence
of moisture in the circuit. The presence of bubbles in the
indicator means that the refrigerant fl uid load is insuffi cient or
that there are non-condensable products in the cooling circuit.
The presence of moisture is characterised by the change in
colour of the control paper located on the sight glass.
● In the 38ZS/ZF units the liquid sight glass is accessed via the
access panel to the electric panel (models 90 to 320) or via
the cooling circuit access (models 360 to 600)..
Warning:
If the unit stops, certain indicators may appear in yellow; the
change in colour is due to the sensitivity, which depends on the
temperature of the fl uid.
These will change to green after a few hours of the unit operating.
If the indicators remain yellow, that will indicate the presence of
excessive humidity in the circuit. This will require the presence
of a specialist.
20
Dryer fi lter
Condensate drain pan
● Check that the condensate pan is clean. There should be no
stagnant water.
● Check that the drain is not clogged.
● Cleaning of the pan can be done with water and non-abrasive
detergent.
Note: in the section "Condensate drain connection" are images
with the position of the drain for all units.
Air coil
● Check that the coil is free from dust and grease.
● Cleaning the accumulated dust on the coil can be performed
with a vacuum cleaner perpendicular to the fi ns or with a low-
pressure water cleaner. Grease can be removed with water
with degreaser. Do not put stress on the fi ns as they could
deform.
Note: models 38ZS/ZF - 90 to 320 with coil in U may incorporate
a protection grille for the coil (optional). This grille is fi xed by
modules in the holes made for this goal in the unit's support.
Remove the grille to clean the coil.
Use safety gloves for this task. Take care with the
sharp parts of the coil.
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