Emerson VISSION 20/20 Manuel D’Utilisation
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CAPACITY INCREASE OUTPUT – This output is only active when the compressor is running. When the Vission
20/20 determines that the compressor should increase capacity by moving the slide valve to a higher percent-
age, this output is energized. Once the slide valve reaches 100%, this output will not energize.
20/20 determines that the compressor should increase capacity by moving the slide valve to a higher percent-
age, this output is energized. Once the slide valve reaches 100%, this output will not energize.
CAPACITY DECREASE OUTPUT – This output is only active when the compressor is running. When the Vission
20/20 determines that the compressor should decrease capacity by moving the slide valve to a lower percent-
age, this output is energized. Once the slide valve reaches 0%, this output will not energize.
20/20 determines that the compressor should decrease capacity by moving the slide valve to a lower percent-
age, this output is energized. Once the slide valve reaches 0%, this output will not energize.
VOLUME INCREASE OUTPUT – This output is only active when the compressor is running. When the Vission 20/20
determines that the compressor should increase VI by moving the volume slide to a higher percentage, this out-
put is energized. Once the volume slide reaches 100%, this output will not energize.
determines that the compressor should increase VI by moving the volume slide to a higher percentage, this out-
put is energized. Once the volume slide reaches 100%, this output will not energize.
VOLUME DECREASE OUTPUT – This output is only active when the compressor is running. When the Vission
20/20 determines that the compressor should decrease VI by moving the volume slide to a lower percentage,
this output is energized. Once the volume slide reaches 0%, this output will not energize.
20/20 determines that the compressor should decrease VI by moving the volume slide to a lower percentage,
this output is energized. Once the volume slide reaches 0%, this output will not energize.
OIL SUMP HEATER OUTPUT – This output is active and energized when the oil separator temperature is lower than
the oil separator temperature setpoint. It is de-energized when the oil separator temperature is higher than the
oil separator temperature setpoint.
the oil separator temperature setpoint. It is de-energized when the oil separator temperature is higher than the
oil separator temperature setpoint.
ALARM OUTPUT – This output is energized when the system has no alarms. If an alarm is issued, the output de-
energizes and stays de-energized until the alarm condition is cleared.
energizes and stays de-energized until the alarm condition is cleared.
SLIDE VALVE SETPOINT #1 OUTPUT (ECONOMIZER) – Normally used for an economizer solenoid, but could be used
for other devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point
#1”, the output is energized. When the compressor slide valve percentage is less than “slide valve set-point #1”,
the output is de-energized.
for other devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point
#1”, the output is energized. When the compressor slide valve percentage is less than “slide valve set-point #1”,
the output is de-energized.
SLIDE VALVE SETPOINT #2 OUTPUT (HOT GAS) – Normally used for a hot gas solenoid, but could be used for other
devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point #2”, the
output is energized. When the compressor slide valve percentage is less than “slide valve set-point #2”, the
output is de-energized.
devices. When the compressor slide valve percentage is equal to or greater than “slide valve set-point #2”, the
output is energized. When the compressor slide valve percentage is less than “slide valve set-point #2”, the
output is de-energized.
SLIDE VALVE SETPOINT #3 OUTPUT – When the compressor slide valve percentage is equal to or greater than
“slide valve set-point #3”, the output is energized. When the compressor slide valve percentage is less than
“slide valve set-point #3”, the output is de-energized.
“slide valve set-point #3”, the output is energized. When the compressor slide valve percentage is less than
“slide valve set-point #3”, the output is de-energized.
SLIDE VALVE SETPOINT #4 OUTPUT – When the compressor slide valve percentage is equal to or greater than
“slide valve set-point #4”, the output is energized. When the compressor slide valve percentage is less than
“slide valve set-point #4”, the output is de-energized.
“slide valve set-point #4”, the output is energized. When the compressor slide valve percentage is less than
“slide valve set-point #4”, the output is de-energized.
LIQUID INJECTION #1 OUTPUT – If the compressor has liquid injection oil cooling, this output is active. When the
compressor is running and the discharge temperature is above the liquid injection temperature control set-point
– 5 degrees, and the oil separator temperature is above the override setpoint, then the output is energized. The
output is de-energized when the discharge temperature falls below the “on” setpoint minus the solenoid differ-
ential.
compressor is running and the discharge temperature is above the liquid injection temperature control set-point
– 5 degrees, and the oil separator temperature is above the override setpoint, then the output is energized. The
output is de-energized when the discharge temperature falls below the “on” setpoint minus the solenoid differ-
ential.
LIQUID INJECTION #2 OUTPUT – Not Defined
REMOTE ENABLED OUTPUT – This output is energized when the Vission 20/20 panel is enabled for remote con-
trol. The compressor can be running or stopped, but is available to the remote system. If the compressor has an
alarm or is placed into the manual stop position, this output is de-energized.
trol. The compressor can be running or stopped, but is available to the remote system. If the compressor has an
alarm or is placed into the manual stop position, this output is de-energized.