![background image](http://html1.mh-extra.com/html/gardner-denver/electra-saver-ii/electra-saver-ii_operating-and-service-manual_3661013032.webp)
13–9/10–641 Page 23
side the cover of the enclosure. Wye–delta starters
employ three contactors which are controlled sequen-
tially to provide low current starting. For wye–delta
starters, the motor nameplate amps must be first multi-
plied by 0.577 before using the heater table.
Optional Switches – The “Auto Sentry” controller has
one additional input available for dealer or user
installed optional shutdown switches. If the contact is
opened, the compressor will be shut down, and will dis-
play “HIGH VIBRATION.”
COMPRESSOR CAPACITY CONTROL – TURN
VALVE UNITS ONLY
The capacity of the compressor is controlled by the ac-
tion of the Turn Valve and the Compressor Inlet Valve.
The turn valve controls compressor delivery to match
demands of 40% to 100% of the compressor’s maxi-
mum capacity. The inlet valve throttles to control com-
pressor delivery to match demands of 0% to 40% of the
compressors maximum capacity.
Example with normal setting of 100 PSIG:
Discharge
Compressor
Manifold
Delivery
Inlet Valve
Turn Valve
Pressure
Full Capacity
Open
Closed
100
70% Capacity
Open
50% Open
100
40% Capacity
Open
Full Open
100
30% Capacity
Closing
Full Open
103
20% Capacity
Closing
Full Open
103
0% Capacity
Closed
Full Open
103