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A — START INITIATED — Prestart checks made; evaporator pump started
B — Condenser water pump started (5 seconds after A)
C — Water flows verified (30 seconds to 5 minutes maximum after B). Chilled water temperatures checked against control point.
Guide vanes checked for closure. Oil pump started; tower fan control enabled.
D — Oil pressure verified (15 seconds minimum, 300 seconds maximum after C)
E — Compressor motor starts, compressor ontime and service ontime start, 15-minute inhibit timer starts (10 seconds after D)
F — SHUTDOWN INITIATED — Compressor motor stops, compressor ontime and service ontime stops, 3-minute inhibit timer
starts on PSIO Software Version 08 and lower and 1-minute inhibit timer starts for PSIO Software Version 09 and higher.
G — Oil pump and evaporator pumps deenergized (60 seconds after F). Condenser pump and tower fan control may continue to
operate if condenser pressure is high. Evaporator pump may continue if in RECYCLE mode.
O/A — Restart permitted (both inhibit timers expired) (minimum of 15 minutes after E; [minimum of 3 minutes after F on PSIO Soft-
ware Version 08 and lower] [minimum of 1 minute after F on PSIO Software Version 09 and higher])
Figure 24 — Control Sequence