13–11–602 Page 33
to monitor compressor temperature and shut down the
compressor if a coolant problem is detected.
Oil Thermistor – This sensor is located in the oil pip-
ing and is used to monitor lubrication oil temperature.
System Thermistor – This sensor is located in the
unit discharge piping after the aftercooler. Its signal is
used for gauging and temperature shutdowns.
Water Level Switches – This assembly is located
within the reservoir, and normally simply monitors and
maintains coolant level. If water cannot be adequately
drained, the controller will shut down due to high water
level.
Water Solenoid Valves (FIGURE 1–6, page 4) –
The fill and drain valves respond to the signal from the
water level switches to maintain water level. The fill
valve adds coolant to the system by injection into the
compressor. The drain valve drains water from the res-
ervoir.
Optional Switches – The “Auto Sentry–ES” control-
ler 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 a user selectable message (refer to unit setup ad-
justments for list of messages).
Emergency Stop Push–Button – This is a main-
tained push–button, and removes power from the con-
troller outputs regardless of controller status. It is lo-
cated on the upper section of the panel, next to the
keypad. This should be used for emergency purposes
only – use the keypad “STOP/RESET” for normal con-
trolled stopping.
Automatic restarting or electrical
shock can cause injury or death.
Open, tag and lockout main discon-
nect and any other circuits before
servicing the unit.
Control Transformer – This changes the incoming
power voltage to 110–120 volts for use by all unit con-
trol devices. Two primary fuses and one secondary
fuse are provided. Refer to adjacent labeling for re-
placement information.
Terminal Strip – This provides connections for all
110–120 volt devices not contained within the enclo-
sure.
Pump and Fan Starter – The starter is used to pro-
vide control and overload protection for the fan and oil
pump. Overload heaters should be selected and ad-
justed based on the motor nameplate amps and the
instructions located inside the cover of the electrical en-
closure.
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 in-
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.
Summary of Contents for TWISTAIR EWDQ D
Page 14: ...13 11 602 Page 4 FIGURE 1 6 AIR WATER SCHEMATIC FIGURE 1 7 OIL SCHEMATIC...
Page 17: ...13 11 602 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 18: ...13 11 602 Page 8 DECALS 216EAQ077 206EWD077 222EAQ077 221EAQ077 208EAQ077...
Page 35: ...13 11 602 Page 25 FIGURE 4 2 FLOW CHART FOR SET UP PROGRAMMING...
Page 44: ...13 11 602 Page 34 FIGURE 4 6 CONTROL TUBING SCHEMATIC 206EWD797 A Ref Drawing...
Page 48: ...13 11 602 Page 38 FIGURE 4 10 WIRING DIAGRAM FULL VOLTAGE 202EWD546 REF DRAWING...
Page 49: ...13 11 602 Page 39 FIGURE 4 11 WIRING DIAGRAM WYE DELTA 203EWD546 REF DRAWING...
Page 50: ...13 11 602 Page 40 FIGURE 4 12 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 53: ...13 11 602 Page 43 FIGURE 5 2 FLOW DIAGRAM AIR COOLED 202EWD797 B Ref Drawing...
Page 54: ...13 11 602 Page 44 FIGURE 5 3 FLOW DIAGRAM WATER COOLED 203EWD797 A Ref Drawing...
Page 68: ......
