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MOISTURE IN COMPRESSED AIR
Moisture in compressed air will form into droplets as it comes from an air
compressor pump. When humidity is high or when a compressor is in continuous
use for an extended period of time, this moisture will collect in the tank. When
using a paint spray or sandblast gun, this water will be carried from the tank
through the hose, and out of the gun as droplets mixed with the spray material.
IMPORTANT: This condensation will cause water spots in a paint job, especially
when spraying other than water based paints. If sandblasting, it will cause the sand
to cake and clog the gun, rendering it ineffective. A filter in the air line, located as
near to the gun as possible, will help eliminate this moisture.
to drain moisture from the tank daily
to reduce the risk of corrosion.
Drain liquid from
tank daily.
Reduce tank pressure below 10 psi, then
drain moisture from tank daily to avoid
tank corrosion. Drain moisture from
tank by opening the drain valve located
underneath the tank.
Motor Protection - If the unit is over
worked, a thermal limiter will shut unit
off. If this happens, switch unit to OFF,
wait 30 minutes to cool, turn ON again
to resume work.
BEFORE FIRST START-UP
BREAK-IN PROCEDURE
(Complete this procedure before using
compressor for the first time. Once
completed, it is not necessary to repeat.)
1. Turn regulator knob fully clockwise (to
the right) to open air flow and open
drain valve.
2. Turn On/Off switch to OFF position.
3. Plug in power cord.
4. Turn On/Off switch to ON position and
run compressor for 30 minutes.
5. Turn On/Off switch to OFF position.
6. Unplug power cord.
The compressor is now ready for use.
OPERATING PROCEDURE
1. Turn regulator knob fully counter
clockwise (to the left) to close air flow.
2. Connect air hose to outlet of
regulator.
3. Turn On/Off switch to OFF position.
4. Plug in power cord.
5. Turn On/Off switch to ON position
and let compressor run until it reaches
automatic shutoff pressure.
6. Attach tire chuck or tool to end of
hose.
7. Turn regulator knob clockwise (to
the right) to desired pressure of tool
being used.
ON/OFF CYCLING OF COMPRESSOR
In the ON position, the compressor
pumps air into the tank. When a shut-off
(preset “cut-out”) pressure is reached,
the compressor automatically shuts off.
If the compressor is left in the ON
position and air is depleted from
the tank by use of a tire chuck, tool,
etc., the compressor will restart
automatically at its preset “cut-in”
pressure. When a tool is being used
continuously, the compressor will cycle
on and off automatically.
In the OFF position, the pressure switch
cannot function and the compressor
will not operate. Make sure switch
is in OFF position when connecting
or disconnecting power cord from
electrical outlet.
ASME SAFETY VALVE
Do not remove or
attempt to adjust
the safety valve!
Check the safety valve by performing
the following steps:
1. Plug the compressor in and run until
shut off pressure is reached (see
Operating Procedure).
2. Wearing safety glasses, pull the ring
on the safety valve (see Figure 4) to
release pressure from compressor
tank. Use your other hand to deflect
fast-moving air from being directed
toward your face.
3. The safety valve should automatically
close at approximately 40-50 psi. If the
safety valve does not allow air to be
released when you pull on the ring,
or if it does not close automatically, it
MUST be replaced.
Safety valve must
be replaced if it
cannot be actuated or it leaks air after
ring is released.
PRESSURE GAUGES
Gauge attached to regulator indicates
air pressure going to hose (and any tool
attached to end of hose).
Gauge attached to pressure switch
indicates air pressure in tank.
Maintenance
Release all pressure
and disconnect
power before making any repair.
1. Check compressor for any visible
problems, especially check air filter to
be sure it is clean.
2. Pull ring on safety valve and allow it to
snap back to normal position (Figure 4).
Safety valve must
be replaced if it
cannot be actuated or it leaks air after ring
is released.
3. Daily with compressor shut off:
Depressurize system prior to draining
tank. Drain moisture from tank by
opening drain cock underneath end
of tank and tilt to drain.
4. Turn power OFF and clean dust and dirt
from motor, tank, air lines and pump
cooling fins.
NOTE: The air filter in the filter housing on
the side of the head must be checked and
cleaned periodically, more often if used
under very dusty conditions or when a
great deal of fog from spraying is allowed
to circulate near unit.
5
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HM7500 and HM7510
Operation (Cont.)
Figure 5
Drain
Cock
Figure 4