Porter-Cable C3151 Instruction Manual page 12

Cooling System (not shown): This compressor contains an advanced design
cooling system. At the heart of this cooling system is an engineered fan. It is
perfectly normal for this fan to blow air through the vent holes in large amounts.
You know that the cooling system is working when air is being expelled.
Air Compressor Pump (not shown: Compresses air into the air tank.
Working air is not available until the compressor has raised the air tank
pressure above that required at the air outlet.
Drain Valve (I): The drain valve is
located 41at the base of the air tank and
is used to drain condensation at the end
of each use.
Check Valve (L): When the air
compressor is operating, the check valve is "open",
allowing compressed air to enter the air tank. When
the air compressor reaches "cut-out" pressure, the
check valve "closes", allowing air pressure to remain
inside the air tank.
Air Intake Filter (K): This filter is designed to clean air
coming into the pump. This filter must always be clean
and ventilation openings free from obstructions. See
"Maintenance".
Pressure Release Valve (M): The pressure release valve located on the side
of the pressure switch, is designed to automatically
release compressed air from the compressor head and
the outlet tube when the air compressor reaches "cut-
out" pressure or is shut off. The pressure release valve
allows the motor to restart freely. When the motor stops
running, air will be heard escaping from this valve for
a few seconds. No air should be heard leaking when
the motor is running, or continuous leaking after unit
reaches "cut-out" pressure.
A08192 12- ENG