Conair VRU, User Manual

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4-2 I Operation
Starting Operation
Turn on the main disconnect and then turn the selector switch to bin number to be filled.
Turn power switch on.
The pump will start and will load material into the vacuum receiver until the bindicator in
the receiver is satisfied.
The 4-way valve on the pump then reverses the air flow and blows the filter clean. This
backflow of air also aids the discharge of material from the receiver.
After a timed discharge-blowback cycle, the 4-way valve again reverses and material is
loaded in the receiver. This load - unload cycle is repeated until the high level bindicator
in the bin is satisfied. At this time, the pump shuts off and the “bin full” light comes on.
At times, the bindicator in the vacuum receiver may not be satisfied because material
never gets to it. This may be caused by several reasons: A plugged material line; broken
material or vacuum line; the container (railcar, bin, etc.) from which material is being
drawn runs empty. When this happens, the alarm timer lTM will time out and the alarm
light comes on. If the optional alarm horn has been installed, it too will come on at this
time.
If the control switch is in the “shut down” position, the system ill shut down and it will be
necessary to press the reset button to re-start it.
If the control switch is in the “continuous cycle” position, the system will continue to
cycle until it is manually shut down. The alarm light and optional horn will come on and
stay on until the system is shut down or the reset button is pressed.
The ·load timer in the control box should be set 15 to 20 seconds longer than it takes the
material to reach the bindicator in the vacuum receiver. This will prevent frequent nui-
sance tripping of the alarm.
If desired, the bindicator in the vacuum receiver can be omitted. In order for the control to
operate without the bindicator, it is necessary to do the following:
1
Connect jumper to terminals 9 and 13 in control box.
2
Remove relay 3CR (See wiring diagram).
3
Adjust the load timer for necessary. load time.