Commissioning - Carrier 50NC Series Installation, Operation And Maintenance Instructions

14 - COMMISSIONING

14.1 Commissioning
● It is advisable to create a detailed layout of the installation,
including the position of the unit and all utilized components.
This will be greatly benefi cial for maintenance and repairing
purposes.
● The following must be verifi ed:
- That the electrical power supply remains constant and that
it corresponds to that featured on the unit data plate.
- That the electric installation has been carried out according
to the provided wiring diagram (refer to "Electrical
connection" chapter).
- The correct connection of the sensors supplied with the unit
(refer to "Electrical connection" chapter).
- That there are no cables close to heat sources.
● After completing the aforementioned verifications, the
automatic control switch supplies voltage to the control circuit.
Attention: the compressor crankcase heater must be put
under voltage for 24 hours before starting the compressor.
Important: As a safety feature to ensure heating of the
crankcase heater, if there is a power cut lasting over 2 hours,
the compressors will be locked. The unit must be powered for
8 hours to unlock them. The graphic terminal unit display will
show the time remaining until they can be unlocked.
● All the units are equipped with
scroll-type compressors and a
phase control relay. Verify that
they rotate in the correct sense
and, if not, reverse the power
wires.
● Check the unit operation and verify the safety devices.
SCROLL COMPRESSOR.
CHECK SENSE OF ROTATION
COMPRESSEUR SCROLL.
VÉRIFIER LE SENS DE ROTATION
COMPRESOR SCROLL.
COMPROBAR SENTIDO DE GIRO
Control of the refrigerant charge
● The Package version is shipped from the factory with an exact
charge of R-410A refrigerant for proper operation.
The Split version must be fi lled with refrigerant following the
recommendations in the chapter "Refrigerant connections".
The Split version with service valves (optional) is supplied
with the required charge for an equivalent distance of 7.5 m.
● The following images show the access panels to the refrigerant
circuits, fi xed with Allen M6 screws.
Models 022 to 042 (1 circuit)
Models 058 to 490 (2 circuits)
Circuit 2
Circuit 1
● To make sure that the unit is fi lled with the correct charge of
refrigerant, check the values of overheating and subcooling,
circuit by circuit, with the system running at full capacity.
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