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Carrier 38MC 207-334 Manual

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Refrigerant line connection
(Flare connnections)
Collegamento linea refrigerante
(attacchi a cartella)
Refrigerant line selection
(For 38MC/MCJ models)
General conditions
When designing the refrigerant lines, the
following must be kept in mind:
• Depending on the unit arrangement:
Suction line (option A):
• A trap is needed at the base of the
vertical stretch.
• MOST UNFAVOURABLE CONDITION
The suction speed in the vertical stretch
must be higher than 6 m/s.
Suction line (option B):
• The intermediate traps can be omitted.
• MOST UNFAVOURABLE CONDITION:
The suction speed in the vertical stretch
must be higher than 6 m/s.
For both option A and for option B you must
remember the following:
• The maximum speed permitted in any line
is 15 m/s.
• The suction line must be insulated and
have a 2% slope towards the compressor
in the horizontal stretch.
• In long lengths it could be necessary to
adjust the oil charge.
• The liquid should be subcooled by at
least 1°K at the restrictor inlet. If the liquid
line is ariser and longer than 15 m, it must
be subcooled 1°K for each 3.5 m in
excess.
Indoor unit
Outdoor unit
Liquid
Suction
Scelta delle linee frigorifere
(Per modelli 38MC/MCJ)
Condizioni generali
Nel progettare le linee frigorifere si consiglia
di tenere sempre presente le seguenti
raccomandazioni:
• In base alla sistemazione dell’unità:
Linea di aspirazione (opzione A):
• È indispensabile un sifone alla base del
tratto verticale
• CONDIZIONE MAGGIORMENTE SFAVO-
REVOLE: la velocità di aspirazione nel tratto
verticale deve essere superiore ai 6 m/s
Linea di aspirazione (opzione B):
• I sifoni intermedi non sono strettamente
necessari.
•
CONDIZIONE MAGGIORMENTE SFAVO-
REVOLE: La velocità di aspirazione nel tratto
verticale deve essere superiore ai 6 m/s.
Per entrambi le opzioni (A e B) si deve
ricordare quanto segue:
• La velocità massima permessa in ogni
linea è di 15 m/s.
•
La linea di aspirazione deve essere
isolata e avere una pendenza del 2%
verso il compressore nel tratto orizzontale.
• Nei lunghi tratti potrebbe essere necessa-
rio regolare la carica d’olio.
•
Il liquido dovrebbe essere sottoraffreddato
a una temperatura di almeno 1°C all’orga-
no di laminazione. Per questa ragione,
quando la linea di mandata è in salita e
superiore ai 15 m di lunghezza, deve
essere sottoraffreddata di 1°C per ogni
3.5 m in eccesso.
Unità interna
Unità esterna
Liquido
Aspirazione
A
B
38MC
38MCJ 334
… 30 …


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