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General troubleshooting Ricerca inconvenienti
(Probable cause /
Remedy
)
Unit operates long or continuously:
Cooling load underestimated
Decrease load or reselect a larger size
Ambient thermostat too low
Adjust setting
Low refrigerant charge, leak
Locate leakage, repair, add refrigerant
Compressor valve not tight
Replace compressor
Direct expansion coil fan failure
Check, repair or replace
Air or non-condensable gas in the system
Remove refrigerant, create vacuum,
recharge
Clogged cold water coil, air flow
restriction, air flow bypass
Clean, remedy
Condenser scaled
Clean if possible
High head pressure:
Clogged condenser
Low water flow rate
Check, clean or replace
Refrigerant charge too high
Remove excess
Air or non condensables refrigerant gas in
the system
Remove refrigerant, create vacuum and
recharge
Low head pressure:
Leak or low refrigerant charge
Check for leak, repair, recharge
Worn compressor valve plate
Replace compressor
High suction pressure:
Worn compressor valve plate
Replace compressor
Internal safety valve open
Check and remedy
Refrigerant charge excess
Remove excess
Restrictor failure
Check, replace
(Probabile causa /
Rimedio
)
Il compressore non si arresta:
Unità sottodimensionata
Passare a una grandezza superiore
Regolazione del termostato ambiente
troppo bassa
Regolare adeguatamente
Carica di refrigerante troppo bassa, perdite
Localizzare la perdita, riparare, aggiunge-
re refrigerante
Valvola del compressore lenta
Sostituire il compressore
Ventilatore dellunità ad espansione
diretta difettoso
Controllare, riparare o sostituire
Aria o gas non condensabile nel sistema
Svuotare il sistema, fare il vuoto e
riempire nuovamente
Batteria dellacqua fredda intasata, flusso
daria difficoltoso, aria in corto circuito
Pulire, rimediare
Condensatore ad acqua incrostato
Pulire se possibile, o contattare un ditta
specializzata
Pressione di condensazione troppo alta:
Condensatore dellacqua intasato
Flusso dacqua troppo basso
Verificare, pulire o sostituire
Eccessiva carica refrigerante
Rimuovere leccesso
Aria o gas non condensabile nel sistema
Svuotare il sistema, fare il vuoto e
riempire nuovamente
Pressione di condensazione bassa:
Carica refrigerante insufficiente
Riempire il sistema
Valvola del compressore non a tenuta
Sostituire il compressore
Pressione di aspirazione alta:
Valvola del compressore non a tenuta
Sostituire il compressore
Valvola interna di sicurezza aperta
Verificare e rimediare
Eccessiva carica refrigerante
Rimuovere leccesso
Organo di laminazione difettoso
Verificare, sostituire
44


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