Carrier 17/19EX Specifiche Scaricare il pdf (Pagina 122)

100

101

When the SOFT STOP AMPS THRESHOLD is being applied, a status message

‘‘SHUTDOWN IN PROGRESS, COMPRESSOR UNLOADING’’ is shown.

Chilled Water Recycle Mode

The machine may cycle off and wait until the load increases to restart again when the

compressor is running in a lightly loaded condition. This cycling of the chiller is normal and is

known as recycle. A recycle shutdown is initiated when any of the following conditions are true:

• when in LCW control, the difference between the

LEAVING CHILLED WATER

tem-

perature and

ENTERING CHILLED WATER

temperature is less than the

RECYCLE

SHUTDOWN DELTA T

(found in the SERVICE 1 table) and the

LEAVING CHILLED

WATER TEMP

is below the

CONTROL POINT

, and the

CONTROL POINT

has not

increased in the last 5 minutes

• when

ECW CONTROL OPTION

is enabled, the difference between the

ENTERING

CHILLED WATER

temperature and the

LEAVING CHILLED WATER

temperature is

less than the

RECYCLE SHUTDOWN DELTA T

(found in the SERVICE 1 table) and

the

ENTERING CHILLED WATER TEMPERATURE

is below the

CONTROL POINT

and the

CONTROL POINT

has not increased in the last 5 minutes

• when the

LEAVING CHILLED WATER

temperature is within 3° F (2° C) of the

BRINE

REFRIG TRIPPOINT

When the machine is in RECYCLE mode, the chilled water pump relay remains energized so

that the chilled water temperature can be monitored for increasing load. The recycle control

uses

RECYCLE RESTART DELTA T

to check when the compressor should be restarted. This

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Carrier 17/19EX Specifiche Pagina 122

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