Gardner Denver AUTO SENTRY EAU99G Operating And Service Manual page 36

Solenoid Valves TVC and TVO - These valves control position of the turn valve in response to signals
from the "AutoSentry" controller. With both valves de-energized, equal pressure is supplied to both sides
of the actuator to hold it in its current position. If TVC only is energized, the right side of the turn valve
actuator is exhausted to the compressor inlet cavity, causing the turn valve to move towards the full load
position. If TVO only is energized, the left side of the turn valve actuator is exhausted to the compressor
inlet cavity, causing the turn valve to move towards the unload position.
Control Transformer - This changes the incoming power voltage to 110-120 volts for use by all unit
control devices. Two primary fuses and one secondary fuse are provided. Refer to adjacent labeling for
replacement information.
Terminal Strip - This provides connections for all 110-120 volt devices not contained within the
enclosure.
Fan Starter - The starter is used to provide control and overload protection for the fan. Overload
heaters should be selected and adjusted based on the motor nameplate amps and the instructions
located inside the cover of the electrical enclosure. The starter must be present even for packages
without a local fan.
Main Starter - This starter is used to provide control and overload protection for the main drive motor.
Full voltage starters employ a single contactor; overload heaters should be selected and adjusted based
on the motor nameplate amps and the instructions located inside the cover of the enclosure. Wye-delta
starters employ three contactors which are controlled sequentially to provide low current starting. For
wye-delta starters, the motor nameplate amps must be first multiplied by 0.577 before using the heater
table.
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