NOTES
64
DISCHARGE CHECK VALVE Blocks the reverse flow of air/fluid through the
compressor unit during shutdown.
MINIMUM PRESSURE VALVE Maintains 50 psig (3.5 bar) in the separator/sump tank
when the compressor is running loaded. Also
incorporates a check valve, which prevents compressed
air backflow from the system when unloaded or
shutdown.
PRESSURE RELIEF VALVE Vents the sump vessel to atmosphere before the
compressed air pressure exceeds rated tank pressure.
Its operation indicates fault with the Supervisor
operation unload pressure set too high or failure of
solenoid valve #1.
BLOWDOWN VALVE ASSEMBLY Vents the sump vessel to atmosphere during unloading
and shutdown.
THERMAL MIXING VALVE Bypasses fluid flow around the cooler until the fluid
reaches a temperature of 185°F, 85°C (195°F for water
cooled KT and ≥ 150 psi/ 10.3 bar). Useful for fast
warm-up during start. Maintains a minimum temperature
during periods of low load or low ambient temperatures.
SUMP SIGHT GLASSES Indicates level of lubricant in the sump. Located on the
sump side, fluid level should be maintained at center of
the sight glass with machine shut down.
SEPARATOR RETURN LINE SIGHT GLASSES Indicate fluid flow in the separator return lines. Flow
should be visible during full load operation; little to no
flow during unloaded operation. Sluggish flow during full
load operation indicates the need to clean the strainers
fitted to the return lines.
WATER PRESSURE SWITCH De-energizes the starter, via the Supervisor, if the water
pressure falls below 10 psig (0.7 bar). This switch is not
adjustable. Used on water-cooled packages only.
DRAIN VALVES Lubricant sump drain valve.
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