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FORM 160.72-O1 (810)
figure 16 -
AUTO / MANUAL CONTROL SCREEN
overvieW
This screen allows the manual control of the Pre-
Rotation Vanes, Hot Gas Bypass Valve, Subcooler
Valve, and Interstage Valve. Each device may be set
for automatic control or manual control between 0%
and 100%. This display also allows the setting of Anti-
Surge points and the Leaving Chilled Local Setpoint.
displaY onlY
All devices will have to following parameters that may
be viewed:
•
Auto calculated percentage
•
Manual percentage
•
Delta (differential) between auto and manual.
•
Control Mode
In addition, the Anti-Surge setpoints are also displayed.
See the Anti-Surge setpoints section for a detailed ex-
planation.
pre-rotation vanes
Displays the current PRV position.
JOHNSON CONTROLS
auTo / Manual ConTrol sCreen
hot gas Bypass
Displays the current Hot Gas valve position.
subcooler level
Displays the current Subcooler Liquid Level.
interstage valves
Displays the current Interstage valve position of valve
"A" or "B".
anti-surge-high head Min. vane
Minimum vane position in percent for stable operation
at high head condition.
anti-surge-low head Min. vane
Minimum vane position in percent for stable operation
at low head condition.
anti-surge-pressure delta
Condenser pressure minus Evaporator pressure.
anti-surge Max.pressure delta
Maximum compressor differential pressure in PSID
for stable operation.
3
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