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OPERATING INSTRUCTIONS (CONTINUED)
Recommended Break-In Period
The compressor should be run continuously at 90 PSI or lower 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.
If the compressor is run under humid conditions for short
periods of time, the humidity will condense in the crankcase and
cause the oil to look creamy. Oil contaminated by condensed
water will not provide adequate lubrication and must be
changed immediately. Using contaminated oil will damage
bearings, pistons, cylinders and rings and is not covered under
warranty. To avoid water condensation in the oil, periodically
run the compressor with tank pressure near 120 psi for single
stage compressors by opening the drain valve or an air valve
connected to the tank or hose. Run the pump for an hour at
a time at least once a week or more often if the condensation
reoccurs.
IMPORTANT: Change oil after first 50 hours of operation and
every 200 hours
Pressure Switch, Start - Stop
NOTE: Single stage compressors have a maximum operating pressure of 140 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 110 psi cut-in and 140 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 7).
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 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.
Draining Tank
Condensate must be drained from the tank daily, use
manual tank drain (see Figure 8).
afterwards.
Figure 7 - Pressure Switch
Figure 8 - Manual Tank Drain
11
Unloader
(behind pressure switch)
Safety Relief
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