Carrier 50FC 020-099 Installation, Operation And Maintenance Instructions Download Page 71

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14 - MAINTENANCE

Main circuits:

R-454B

Cooling recovery circuit (optional):

■

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

uid present within the installation (added and recovered),

the quantity of recycled

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 quali

ed technician and with the correct

equipment for the unit. Any inappropriate handling can lead to
uncontrolled

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,

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

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,
h elect sensor. It is divided
into two parts, for easy inspection and sensor
replacement.

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 flammability 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-o

ﬀ

(by default, 10%):

Percentage of LFL below which the refrigerant leak alarm ends
and the unit stops operating in PROTECTION MODE.

■

Air

ow (by default, to 100%): Percentage of the air

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 air

ow (parameterizable) and opens

the fresh and exhaust air dampers at 100% (if they are 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.
If the unit is connected to a BMS monitoring system, the electronic
control is prepared to send an alarm signal in case of leakage
detection.
In any case, alarms will be maintained until they are reset from
the graphic terminal (manual reset).
Note: Refer to the “50FC” control brochure to obtain more detailed
information on its operation.

Sensor

This detector is installed on a panel next to the supply fans of the
indoor circuit. This position ensures the correct reading of the gas
concentration in the indoor coil.

50FC

020

028

037

040

045

047

Charge

(kg)

C1: 7,2 C1: 7,5 C1: 9,9 C1: 9,9 C1: 10,2 C1: 10,4

Environ.

impact