Carrier 50FF/FC 020-093 Installation, Operation And Maintenance Instructions page 66

14 - MAINTENANCE
14.3.6 - Air fi lters
■ Depending on the installation conditions, the fi lter aspect must
be examined to defi ne the cleaning or replacing periodicity.
Spare parts should be planned for.
■ The pressure drop data of the technical catalogue are given for
clean fi lters. Cleaning the fi lters is very important to maintain
the required available pressure of the unit.
On units with fi lter fouling detection with diff erential pressure
switch, an alarm is triggered on the electronic control when the
factory-set clogging threshold is exceeded depending on the
combination of fi lters selected.
■ Gravimetric fi lters (G4):
- Cleaning can be done with a household vacuum cleaner.
Replace them regularly.
■ Creased opacimetric fi lters (M6, F7, F8 and F9):
- It is necessary to replace them.
Filter removal:
■ The access panel to the fi lters features
dual locks which can serve as a hinge or
can be used to remove the panel.
Check that the locks are not blocked.
Open the locks with a 4 mm Allen key (in
an anticlockwise direction).
Caution: pay attention when opening the panel to avoid any
damage to the siphon of the condensate drain.
■ The width of the frames is 24 mm for the G4 standard type and
48 mm for the G4 low pressure drop and all opacimetric fi lters.
Important: G4 fi lters standard type supplied from the factory
cannot be replaced by other types of filters because the
thickness of the frames is diff erent.
When the factory-selected frames combination has less than
98 mm width, the structure incorporates a tensioner to lock the
position of the frames.
To extract the frames it is necessary to loosen the screws
securing the tensioner.
Tab for displacement
of the frames
Fastening screws for the
tensioner (M4 Allen)
66
14.3.7 - Air fi lters in the recovery module
■ The inside of the heat recovery unit module is accessed via the
left-hand panel (front view), for maintenance tasks concerning
the fi lters and the condensate pan. This panel features dual
locks.
The access panels to the fi lters are secured using M4 Allen
screws. The procedure for cleaning the fi lters is described In
the preceding paragraph.
Note: gravimetric fi lters G4 on the fresh air intake can be
replaced by G4 with low pressure drop (l.p.d.) or G4 + M6.
Access panel to fi lters,
M4 Allen screws
Filters on
the exhaust
air outlet
14.3.8 - Air fi lters in the grids of the electrical cabinet
■ The appearance of the fi lters located
inside of the grids must be examined
periodically, because the clogged fi lters
impede good ventilation.
■ Cleaning can be done with a household
v a c u u m c l e a n e r. R e p l a c e t h e m
regularly.
115 x 115 mm G2 fi lters.
14.3.9 - Refrigerant leak detector (optional)
The gas detector sensor is a device that
signals leaks in refrigerant. This sensor is
installed next to the supply fan. In case of
alarm, it is reset manually.
Maintenance:
■ Annual testing: it is necessary to carry out testing every year
to comply with the EN378 and F-GAS regulations.
■ Every 3 years: a taring test is recommended.
■ Every 5/6 years: it is recommended that the gas detection
Tensioner
element be replaced and calibration performed.
Note: Check the documentation attached to the leak detector for
taring and calibration testing.
Filters on the
fresh air intake
Wheel
Drain
connection
Left-hand panel