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Figure 1-1. Operational Flow Charts (1 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 1 • Operational Flow Charts
Volume and
Capacity slides are
less than 5%
Oil Separator Temp
>Oil Sep Start Trip
Setpt
Filter Di Press <
Start Filter Di Trip
Setpt
Oil Pump On: Prelub Oil Press is > Prelub Oil
Press Reset Setpt for “Min Compressor Prelub Timer”
setting (typically 5 seconds)
Start Compressor
Start
Compressor
Is
Run Oil Press>
Prelub Oil Press
Reset setpt?
(Default 5 PSI)
Is
Run Oil Press>
Run Oil Press
Reset setpt?
(Default 40 PSI)
“Oil Press
Bypass at Comp
Start” timer
expires (60 sec
after start)
Run Oil Press Failure Run Oil Press Failure
“Filter Di Press Safety
Changeover” timer expires
(60 sec after start)
Is Filter Di >
Hi Filter Di Press Run
Trip Setpt
for 5 seconds
Oil Separator Temp
Safety Changeover
Timer expires (5 min
after start)
Is
Oil Sep Temp > Lo
Oil Sep Run Reset
setpt?
Run
Run Filter Di Press Failure
Lo Run Oil Sep Temp Failure
Is
Motor Amps >
FLA (ON)
Setpt?
Is
Dsch Press >
Cutin (ON)
Setpt?
Is
Dsch Press >
Cutout (OFF)
Setpt?
Capacity Increase
Disabled
Capacity Decrease
until Amps < FLA x
1.0625
Normal Loading and
Unloading
Is
Motor Amps >
FLA (OFF)
Setpt?
Capacity Increase
Disabled
Capacity Decrease until
Dsch Press < ON Setpt x
1.0625
Normal Loading and
Unloading
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
YesYes
No
No
No
No
No
No
No
Requirements to Start Compressor
Critical Compressor Run Logic at Compressor Start
Compressor Amperage Load Limiting High Discharge Pressure Load Limiting