Carrier 50FF 020 Installation, Operation And Maintenance Instructions page 73

14 - MAINTENANCE
R-410A 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.
■ Every 5/6 years: it is recommended that the
gas detection element be replaced.
Note: Check the documentation attached to the
leak detector for taring and calibration testing.
Active recovery (optional)
■ A cooling recovery circuit is optionally available for these
units (BA and BB assemblies). It is a complete circuit with
independent electronic control. The circuit is composed of:
- Return EC plug-fan.
- Air circuit comprised of coils with copper pipes and aluminium
fi ns.
- Electronic expansion valve.
- Hermetic scroll-type compressor assembled over antivibration
mounts.
- Crankcase heater.
- Four-way cycle reversing valve.
- Anti-acid dehydrator fi lter.
- High and low pressure transducers.
- Condensates drain pan.
■ The same recommendations for the maintenance of the
components of the main circuits must be followed for the
components of this circuit.
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.
Compressors
in tandem
Filter dryer
Air coil
■ Check that the coil is free from dust and grease.
■ Cleaning the accumulated dust on the coil can be performed
using a soft-bristled brush or 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.
Use safety gloves for this task. Take care with the sharp
parts of the coil.
Outdoor coil protection grid (optional)
A protective grid can be fi tted to the coil.
This grid, fi xed with M6 Allen screws, must be removed to
clean the coil.
M6 Allen
screws
Condensate drain pan
■ These units are equipped with a
condensate drainage pan sloped
toward the drain. This pan is removable
for easy cleaning. It is secured to the
unit using 4 M6 Allen screws.
■ Check that the condensate pan is
suffi ciently clean.
■ Check that the drain is not clogged.
■ Cleaning of the pan can be done with water and non-abrasive
detergent.
Supply fan in «In-line» units
■ The terminal block of the motor is accessed from the outdoor
unit. For that the next panel must be removed:
M6 Allen
screws
Access
panel
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