Carrier 50EH, Installation, Operation And Maintenance Instructions

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Packaged rooftop units
26
WICHTIG: WIEDERBEHEIZUNG DER
OLWANNE
IMPORTANT: CRANKCASE HEATING
IMPORTANT: SURCHAUFFE CARTER D’HUILE
IMPORTANTE: RISCALDARE IL CARTER
DELL’OLIO
IMPORTANTE: RECALENTAMIENTO DE
ACEITE DEL CÁRTER
KOENNEN.
TO ALLOW THE COMPRESSOR(S) STARTING
AU PREMIER DÉMARRAGE OU APRÈS UNE ABSCENCE
TENSION 24 HEURES AVANT D’AUTORISER LE
DÉMARRAGE DU(DES) COMPRESSEUR(S).
AL PRIMO AVVIAMENTO U DOPO UNA INTERRUZIONE
PROLUNGATA DELLA ALIMENTAZIONE ELETTRICA,
LASCIARE LA MACCINA SOTTO TENSIONE PER 24 ORE
PRIMA DI AUTORIZZARE L’AVVIAMENTO DEL(DEI)
COMPRESSORE(I).
ANTES DEL PRIMER ARRANQUE O DESPUÉS DE UNA
AUSENCIA DE CORRIENTE POR UN LARGO PERIODO DE
TIEMPO, CONVIENE QUE LA UNIDAD ESTÉ CONECTADA
UN MÍNIMO DE 24 HORAS.
BEIDER ERSTEN INBETRIEBSETRUNZ ORDER NACH EINER
LANGEN STROMUNTER-BRECHUNG BRINGEN SIE DIE
MASCHINE UNTER SPANNUNG 24 STRUNDERLANG
BEVOR SIE DEN(DIE) KOMPRESSOR(EN) EINSCHALTEN
FOR THE FIRSTSTART OR AFTER ALONG TIME OUT OF
VOLTAGE PUT THE MACHINE ON LIVE 24 HOURS BEFORE
DE COURANT PROLONGÉE, METTRE LA MACHINE SOUS
COMPRESOR SCROLL.
COMPROBAR SENTIDO DE GIRO
COMPRESSEUR SCROLL.
VÉRIFIER LE SENS DE ROTATION
SCROLL COMPRESSOR.
CHECK SENSE OF ROTATION
- Check the unit operation and verify the safety devices.
- Verify the absence of any leaks of the refrigerant. In case of a leak:
• Completely empty the unit using a speci
fi
c recovery unit for R-410A
and repair the leak.
• Next, reload the gas into the unit according to load data provided
in the technical characteristics table and in the unit’s data plate.
• Add the refrigerant via the schrader valve of the liquid line using the
appropriate equipment and tools, with the compressor(s) stopped,
monitoring the pressures to control any anomaly.
- When commissioning the compressors, check the subcooling and
overheating and thus verify if the refrigerant load is appropriate to
the operating conditions.
- If the refrigerant load is lower than required, the suction pressure
will be rather lower than normal, and overheating when suctioning
from the compressors will be high. This can cause an interruption
in operation due to activation of the refrigerant load safety device.
To adjust the refrigerant load, a schrader valve is built into the unit
on the liquid line for each circuit.
Note: the schrader valves are located inside the compressors
enclosure.
R 410A
Control of the refrigerant load
Access to the compressors
enclosure of circuit 1 and
recovery circuit (optional)
Access to the
compressors
enclosure of circuit 2
Models 200 to 360
- All the 50EN/EH models are equipped with scroll type compressors
and have a phase control relay. Verify that they turn in the correct
direction and, if not, reverse the power wires.
12. C
OMMISSIONING
Checks prior to commissioning
- It is advisable to make a complete sketch of the installation including
the location of the unit and all the components used. This will be very
helpful for maintenance and repairs to the installation.
- The following must be veri
fi
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
electric wiring diagram provided with the unit (consult the chapter
on “Checking before commissioning”).
• The correct connection of the sensors supplied with the unit.
• That they are no cables close to heat sources.
- Once the above veri
fi
cations have been carried out, the control circuit
is supplied with voltage by the automatic control switch. It is necessary
to leave the compressor crankcase heater with voltage for 24 hours
before starting the compressor.