Crankcase Breather - Speedaire 35WC74 Instrucciones De Funcionamiento Y Manual De Piezas

OPERATING INSTRUCTIONS (CONTINUED)
Guarding
The belt guard provided must be installed before operating the unit.
All moving parts must be guarded. All electrical covers must be installed before turning on the power.
Recommended Break-In Period
The compressor should be run continuously for one hour to allow proper seating of the piston rings.
1. Open drain cock completely and run the compressor for 60 minutes.
2. Turn off the compressor and close drain cock. The compressor is now ready for use.
Pressure Switch, Start - Stop
NOTE: This compressor has a maximum operating
pressure of 175 psi. Do not alter pressure settings on
control components above this limit.
The compressor unit starts and stops based on preset
pressure switch settings of 145 psi cut-in and 175 psi
cut-out. The pressure switch contains an unloader which
is a small valve that vents air to allow the motor to start
easily (see Figure 11).
Unloader valve
The unloader valve on the pressure switch should hiss
for a short period of time when the compressor shuts
off. This relieves the head and the exhaust tubing of any
pressure and allows the compressor to start under no
load. Because compressors have high starting torque Figure 11 - Pressure Switch
the unloader is necessary for proper starting of the
compressor.
The check valve is a one way valve that keeps the air in the tank when the unit shuts off. The easiest way to de-
termine if the check valve is working properly is to make sure that the pressure switch unloader quits hissing after
the compressor shuts off. The hissing should last for several seconds and then quit.

Crankcase Breather

During severe operating conditions or initial start-up, some oil may accumulate at the crankcase breather
opening. This is normal and will diminish as the pump accumulates run time and the piston rings become fully
seated.
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