Carrier 50FC Installation, Operation And Maintenance Instructions page 55

14 - MAINTENANCE
■ A logbook must be established for equipment subject to
periodic leak tests (verify the registration requirements under
national regulations). It should contain the quantity and the type
of fl uid present within the installation (added and recovered),
the quantity of recycled fl uid, regenerated or destroyed, the
date and output of the leak test, the designation of the operator
and its belonging company, etc. Contact your local dealer or
installer if you have any questions.
■ All refrigerant charging, removal and draining operations must
be carried out by a qualifi ed technician and with the correct
equipment for the unit. Any inappropriate handling can lead to
uncontrolled fl uid or pressure leaks.
■ Limit the amounts stored in mechanical rooms. Cylinders
and tanks of refrigerant must be handled with care and signs
warning users of the related poisoning, fi re and explosion
hazards must be clearly visible.
■ Refrigerant that reaches the end of its life must be collected and
recycled in accordance with applicable regulations.
Important: Always follow the recommendations given in
section 2.2 "Safety standards for refrigerant".
R-454B refrigerant leak detector (standard)
Due to the A2L category of refrigerant R-454B (lightly fl ammable),
it requires the installation of a refrigerant leak
detector. This detector uses infrared instead
of semiconductor technology with no need of
calibration (self-calibration).
This detector integrates, in a single assembly, housing +
electronics + sensor. It is divided into two parts, for easy inspection
and sensor replacement.
This detector is installed on a panel next to the supply fans. This
position ensures the correct reading of the gas concentration in
the indoor coil.
■ ● En primer lugar hay que colocar el detector en la máquina:
Sensor
The mitigation parameters established in the electronic control
in case of refrigerant leakage are:
- Delay time (by default, 180 seconds): Time so that when a
warning appears on the sensor it does not become an alarm.
After this period the PROTECTION MODE will be activated.
- Concentration of LFL (Lower fl ammability limit) for alarm
(by default, 50%): percentage of the LFL from which the
refrigerant leak failure occurs and the unit starts operating
in PROTECTION MODE.
- Concentration of LFL for alarm switch-off (by default, 10%):
Percentage of LFL below which the refrigerant leak alarm
ends and the unit stops operating in PROTECTION MODE.
- Airfl ow (by default, to 100%): Percentage of the airfl ow rate
of the indoor fans (supply and also return if available) when
the unit starts operating in PROTECTION MODE.
The PROTECTION MODE instantly disables the compressors
and support elements, activates the indoor fans (supply and
also return if available) at 100% of airfl ow (parameterizable)
and opens the fresh air damper at 100% (if available). This
happens temporarily, as long as the leak occurs or the sensor
is held down with failure. If one of these two conditions ceases,
the unit will return to the operating mode it had before the leak
(ON, OFF, COOLING, HEATING, VENT, etc.) and the warning
of protection mode will disappear.
In any case, alarms will be maintained until they are reset from
the graphic terminal (manual reset).
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.
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