RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
070.200-IOM (DEC 11)
Page 23
Integral control will increase the output in increments,
over time, to correct the control input to the setpoint.
Control Input Output %
150°F 0%
155°F 20%
160°F 40%
165°F 60%
170°F 80%
175°F 100%
Figure 21 - Analog Output Calibration
Figure 22 - PID Setup
Based on these descriptions set PID #1 for EZ‑Cool
™
LIOC
per Figure 22 as a starting point. Tuning of the output will be
required. There should be no need to use a derivative gain.
SUCTION CHECK VALVE
Low temperature booster compressor operations require
a more positive suction check valve closure. This is ac‑
complished by allowing the high stage discharge pressure
gas to assist the spring tension and intermediate pressure
closing force.
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