(1) SAFETY RELIEF VALVE Every ROLAIR air compressor is equipped with a safety relief valve which is designed to
discharge tank pressure at a predetermined setting when a systems failure occurs. Check the safety valve periodically by
pulling on the ring only when the tank pressure is completely drained. The spring loaded valve should move freely within the
safety valve body. An inoperable safety valve could allow an excessive amount of tank pressure to build causing the air tank to
catastrophically rupture or explode.
Do not tamper with or attempt to eliminate the safety relief valve.
(2) MANUAL OVERLOAD / MOTOR RESET Every ROLAIR electric air compressor is built with manual overload protection. If
the motor overheats, the overload sensor will trip the reset button to protect the motor. If this occurs, please allow the motor to
cool for approximately five minutes. Locate and push in the reset button. The use of an undersized or excessive length of
extension cord may be the cause of overheating. Re-evaluate the power source and gauge/length of extension cord being
used. (Refer to chart on page 8)
(3) PRESSURE SWITCH Most electric air compressors are operated by the use of a pressure switch. Always make sure
the lever is in the off position before plugging in the power cord. By moving the lever to the “On/Auto” position, the compressor
will start and stop automatically within the settings of the pressure switch which are typically 105 – 130 PSI. Do not attempt to
stop the compressor by unplugging the power cord. To stop, simply move the lever to the “Off” position. The lever operates a
relief valve that dumps off head pressure and allows the compressor to restart without load the next time it is used.
(4)REGULATOR – WORKING PRESSURE To adjust the output/line pressure, simply lift up on the regulator adjustment knob
and rotate clockwise to increase working pressure or counter-clockwise to decrease. Push adjustment knob back down to lock
in setting. Never exceed the manufacturer’s maximum allowable pressure rating of the tool being used or item being inflated.
(5) PRESSURE GAUGE(S) Typically, most compressors are designed with a gauge to measure tank or storage pressure
and another gauge attached to the regulator that indicates output or working pressure.
(6) DRAIN VALVE(S) One or more drain valves are installed to allow moisture to be drained on a daily basis from the
compressor storage tank(s). Open drains carefully and slowly to prevent scale, rust, or debris from becoming expelled at a
high rate of speed.
(7) AIR INTAKE FILTER Air intake filters are installed to prevent foreign matter from entering into the engine or
compressor pump. Check intake elements on a regular basis and either clean or replace as needed. Warm soapy water or
low compressed air may be used to clean the elements. Check intake canisters or elbow components for cracks or broken
seals and replace if structural problems are found.
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