DeVillbiss Air Power Company SP-100-F Troubleshooting Guide download pdf (Page 6)

GENERAL INFORMATION

You have pumhaeed a complete compressoroutfit con-

sistingof an air compressor, ASME approved airtank,

gasoline engine, and associated controls and instru-

ments. The compressor outfit you have selected is a

two stage stationaryoutfit.

Your new compressor can be used for operatingpaint

sprayers,air tools,grease guns, airbrushes, caulking

guns, and sand blasters, spraying weed killer and

insecticides, etc. An air pressure regulatormay be

necessary for some ofthese

applications. Refer to Figure1 for a photographof

the compressorand to identifythe majorcomponents

of the compressor.

A regularlyscheduled program of preventive mainte-

nanceis necessaryto insurethe longlifethat has been

designed into your DeVilbisscompressor outfit.This

instruction manual, along with regular maintenance

will maintainyour compressor outfit ingood working

order.Beforeoperatingor performingany maintenance

onyour outfit,referto these publications.

DESCRIPTION OF OPERATION

The gasoline engine uses a pulley and drive belt to

drive the compressor flywheel. The flywheel turns the

compressor crankshaft causing the up and down move-

ment of the pistons in the cylinder; this up and down

movement draws and compresses the air.

On the down strokeofthe piston,airisdrawn inthrough

the air intake. The exhaust valves remain closed. On

the upstroke of the piston, both the valves are closed

and air is compressed in the cylinder. As pressure

builds inthe cylinderthe exhaust valveopens and the

compressed air is forced out of the cylinder through

the check valve and into the air tank. This process

continuesuntiltheair pressurereachesmaximum tank

pressure.

Working airpressure becomes availablewhenthe com-

pressor has raised the tank pressure above that re-

quired at the air discharge valve.The air intake must

be kept clear of allobstructions which could interfere

with air delivery to the compressor.

All gasoline compressor outfits are continuouslyrun-

ning outfits controlled bytank pressure. At maximum

tank pressure the unloader valve exhausts air to at-

mosphere (blowoff); tank pressure closes the check

valve retainingairpressureinsidethe tank. Whentank

pressure drops to a pre-determined pressu,=, ;3,=

unloader valve closes, and air pressure opens the

check valveallowingcompressed air into the tank.As

maximum tank pressure is reached, if the unloader

valve malfunctions and compressed air is not ex-

haustedat ornear itsblowoff setting,the airtank safety

valve wilt protect the airtank against high pressure by

popping at its factory set pressure. The safety valve

popping pressure is slightly higher than the unloader

valve blowoff pressure.

This compressor outfit is equipped with a gas saving

throttlecontroldevice. When maximumtank pressure

is reached and the unloader valve opens the throttle

control is also activated, The throttlecontrol holdsthe

engine at a factory set idlingspeed untilair pressure

in the tank drops to reset or minimum tank pressure.

At reset pressure when the unloader valve closesthe

throttle control is reactivated and the engine acceler-

ates to full throttle.

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DeVillbiss Air Power Company SP-100-F Troubleshooting Guide Page 6

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