Commissioning; Checks Prior To Commissioning; Possible Problems At Commissioning - Carrier 38HB series Installation, Operation And Maintenance Instructions

Split-system cooling units
and heat pumps
11. C
OMMISSIONING
Che ck s prior t o c om m issioning
- 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 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
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 verifi 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.
WICHTIG: WIEDERBEHEIZUNG DER
OLWANNE
BEIDER ERSTEN INBETRIEBSETRUNZ ORDER NACH EINER
LANGEN STROMUNTER-BRECHUNG BRINGEN SIE DIE
MASCHINE UNTER SPANNUNG 24 STRUNDERLANG
BEVOR SIE DEN(DIE) KOMPRESSOR(EN) EINSCHALTEN
KOENNEN.
IMPORTANT: CRANKCASE HEATING
FOR THE FIRSTSTART OR AFTER ALONG TIME OUT OF
VOLTAGE PUT THE MACHINE ON LIVE 24 HOURS BEFORE
TO ALLOW THE COMPRESSOR(S) STARTING
IMPORTANT: SURCHAUFFE CARTER D'HUILE
AU PREMIER DÉMARRAGE OU APRÈS UNE ABSCENCE
DE COURANT PROLONGÉE, METTRE LA MACHINE SOUS
T E N S I O N 2 4 H E U R E S A V A N T D ' A U T O R I S E R L E
DÉMARRAGE DU(DES) COMPRESSEUR(S).
IMPORTANTE: RISCALDARE IL CARTER
DELL'OLIO
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).
IMPORTANTE: RECALENTAMIENTO DE
ACEITE DEL CÁRTER
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.
- All the 38HB/HF units are equipped with scroll type compressor
and have a phase control relay. Verify that they turn in the correct
direction and, if not, reverse the power wires.
SCROLL COMPRESSOR.
CHECK SENSE OF ROTATION
COMPRESSEUR SCROLL.
VÉRIFIER LE SENS DE ROTATION
COMPRESOR SCROLL.
COMPROBAR SENTIDO DE GIRO
- When commissioning the compressor, check
the subcooling and overheating and thus
verify if the refrigerant load is appropriate to
the operating conditions.
- If the refrigerant load has not been completed and is lower than that
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.
- If the refrigerant load is insuffi cient the liquid sight glass will not be
clean, gas bubbles will appear as foam. To adjust the refrigerant
load, a schrader valve is built into the unit on the liquid line.
The liquid sight glass is located on the support next to the electric
panel.
Access to the
electric panel
Liquid sight
glass
- Verify the absence of any leaks of the refrigerant. In the event of
a leak completely empty the unit using a specifi c recovery unit for
R-410A. Refi ll by following the recommendations featured in the
chapter "Checking before commissioning".
- Check the unit operation and verify the safety devices.
Possible proble m s at c om m issioning
All indications given in this brochure must be respected and
complied with to guarantee a correct operation of the units.
Next, several possible operation problems are stated which could
happen if the conditions of the commissioning are not appropriate.
- Air flow lack: very high differences between inlet and outlet
temperatures, originated by a high pressure drop in the ducts, or by
other causes that impede the correct circulation.
- Air recirculation in the unit, originated by some obstacle in the air
aspiration or outlet.
- Noise problems because of excessive air fl ow in the grille.
- Water overfl owing to the pan problems, originated by an excessive
R 410A
fl ow, an incorrect siphon installation or because a defective unit level.
- Refrigerant circuit humidity problem, because of an incorrect vacuum
realization.
Main door High pressure
switch schrader valve
Gas Liquid Low pressure
line line schrader valve
15