3-3
“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
3.0 System Operation
Check all voltages supplied to the Scroll
system
to ensure they are the required value and phases
needed by the control panel.
Open the outlet isolation valve on each compressor.
Open the receiver isolation valves.
Close the receiver bypass valve.
Close the DP sensor isolation valve.
Close the inlet and outlet valves on
both
dryer/
fi lter/regulator assemblies.
Close the outlet isolation valve.
Apply power to the system and turn the disconnect
switches to “On”.
Inside the control cabinet, switch one of the unit
printed circuit boards from the manual override
“Off ” position to the bottom position, the default
“Automatic” mode. Make sure the Pump Mode on
the Unit touchscreens are in the Off position, see
Figure 3.3.
Figure 3.3 Unit Screen - Off Position
Check for correct direction of rotation of each
compressor by pressing the “Rotation” button
on touchscreen display (found in the Service
section of the Unit touchscreens - See Section
D.3.7 for additional information) and observing
rotation. See Figure 3.4. The Pump Mode for each
compressor must be in the Off Position for the
Rotation to function.
WARNING:
DO NOT RUN THE COMPRESSOR
BACKWARDS!
Figure 3.4 Unit Screen - Service: Rotation
Rotation direction arrows are located on the
belt guard (rotation is counter clockwise, facing
the compressor pulley). Correct the rotation, if
required, by switching the motor leads at the
starter.
REMOVE POWER BEFORE WORKING ON ANY
ELECTRICAL CONNECTIONS.
Repeat the process of switching the Unit printed
circuit boards from the manual override “Off ”
position to the default “Automatic” position and
testing rotation.
Start each compressor by pressing “Automatic”
on the touchscreen. See Figure 3.5. Allow each
compressor module to operate for a short time (15
to 30 seconds) and check for any unusual noises
