Operation - Vanguard CPW 125-4-S Series Operation And Maintenance Manual

OPERATION

This compressor has been inspected, thoroughly tested and approved at the factory. For this unit to give
long satisfactory service it must be installed and operated properly. This compressor has been designed
for a 80%/ON – 20%/OFF duty cycle.
PL70A models are equipped with a pilot valve and head unloaders to provide continuous run capabilities.
The pilot valve acts as an automatic air switch allowing air to flow from the receiver to the head unloader
mechanism, thus actuating it. When the receiver pressure reaches the cut-out pressure setting of the
pilot valve, the pilot valve opens and air is released to the unloader mechanism. The compressor stops
compressing air and runs unloaded until the cut-in pressure setting of the pilot valve has been reached.
At this time air released from the unloader mechanism and the compressor starts compressing again.
Continuous run is recommended if motor starts exceed 8 starts/hour.
Initial Start Up
1. Inspect unit for any visible signs of damage that would have occurred in shipment or during
installation.
Pull main disconnect switch to unit to assure that no power is coming into the unit. "Lock Out" or
2.
"Tag Out" switch. Connect power leads to start.
Do not attempt to operate compressor on voltage other than that specified on order or on
compressor motor.
Check compressor oil level. Add oil as required. See "Compressor Oil Specifications" Section.
3.
NOTE: Do not mix oil type, weights or brands.
4. Activate main disconnect switch.
"Jog" motor and check for proper rotation by direction arrow. If rotation is wrong, reverse input
6.
connections on the magnetic starter.
7. Close receiver outlet hand valve and start.
8. With receiver hand valve closed, let machine pump up to operating pressure. At this stage the
automatic controls will take over. Check for proper cycling operation.
9. This compressor is equipped with a pressure lubrication system. The oil pressure gauge is located
on the bearing housing on the front of the crankcase. During operation oil pressure should normally
be between 15 PSIG and 30 PSIG. Oil pressure can drop to 10 PSIG with no adverse operation.
Oil pressure is maintained internally in the oil pump, so no adjustment is required.
10. Check for proper operation of any options. Refer to individual option instruction sheet.
11. When the initial run period has shown no operating problems, shut unit down and recheck oil level.
12. Open receiver hand valve. The air compressor unit is now ready for use.
This unit can start automatically without warning.
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