DeVillbiss Air Power Company SP-100-F Troubleshooting Guide download pdf (Page 12)

Over-pressurization of the air tank

may cause tank rupture or explosion.

The air tank is protected from over-

pressurization by a safety valve. Do

not eliminate, make adjustments or

substitutions to this device. Occasion-

ally pull the ring on the safety valve

to make sure it operates freely. If it

doesn't, the safety valve must be

replaced. Innercooler safety valves

used on two stage outfits must be

similarly checked.

The safety valve, Figure 7, isset at the factory to be

pressure approximately 15 pounds higher than the

ratedpressureof the outfit.Ifthe unloadervalvemal-

functions and does notexhaustcompressedairauto-

matically at maximum tank pressurethe safety valve

willprotecttheairtank againstexcessive airpressure

by poppingoffat its preset pressure.

Two stagecompressorswithunloadercontrolswillhave

a safetyvalve on theintercooler, set50 to 55 pounds.

The purpose of thissafety valve isto prevent the full

tank pressure building up inthe large, low pressure

cylinderor intercooler.

THRO'I-rLE CONTROL

A gas saving throttle control has been incorporated

on somecompressor outfits.Duringnormaloperation,

as maximumtank pressureis obtained,the unloader

exhausts compressed air and activates the throttle

control of the engine. The throttle control holds the

engine at a factory set idlingspeed untilair pressure

inthe tank dropsto reset orminimumtank pressure.

The unloaderthen reactivates the throttle control

and accelerates the engine to fullthrottle.

ADDITIONAL REGULATORS AND

CONTROLS

Since the air tank pressure is usually greater than

that which is needed, a separate regulatoris usually

employedto controlthe air pressureahead of any

individualairdrivendevice.

The gasoline engine and air compressor

pumps on all compressor outfits are

shipped without oil Do not attempt to

operate for any reason without first add-

ing oil to the engine and compressor

pump crankcase. Serious damage can

result from even very limited operation

unless filled with oil and broken in

correctly. Make sure to closely follow the

initial startup procedures.

NOTE

The compressor outfit should be placed

on a level surface in a dry, clean, well

ventilated, area. Do not place any mate-

rial on or against the belt guard. This

blocks ventilator openings necessary for

proper compressor cooling.

1. Remove the oilfill plugson the gasoline engine

and air compressorpump and slowly addoil

untilthe unitsare full. Refer to the "Gasoline

Engine OwnersManual"for recommended oils

and fill capacitiesfor the engine. The compres-

sor pump holdsapproximately60 fluid oz..

TWO STAGE COMPRESSOR UNITS

Figure 7. Safety Valve

Viscosity Chart

Recommended Oil

(API SG/CD Heavy Duty]

Room or Ambient

Temperature

SAE20 Below 20°F

SAE30 Above 32°F

Crankcase capacity equals approximately 60 fluid

ounces,

2. The air compressor outfitis readyforuse.

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DeVillbiss Air Power Company SP-100-F Troubleshooting Guide Page 12

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