Figure 3-44. Airless hot spray system
c. The system shown in Figure 3-43, page 3-35, is operated by compressed air; however, some
airless models and the hot sprayer are electrically operated. The generation of static electricity and
proper daily maintenance are two primary concerns when airless-spray systems are used.
(1) Static electricity. It is possible for sparking to occur between a gun and the object being
sprayed; this is due to a static-electrical potential that is generated by the high pressure necessary for
airless spraying. Sparking can result in explosion and/or fire. To prevent sparking, ensure that both the
object being sprayed and the airless equipment are grounded. Do this by attaching a static wire to
ground. If the hose does not contain a static-electrical conductor, a static wire must be attached from the
spray gun to a ground rod.
(2) Daily maintenance. Under no circumstances should paint be permitted to set up, settle
out, or dry within the pump. Perform routine maintenance and cleaning daily by using the following
Step 1. Lubricate the motor when the pump is operating and there are signs of moisture
condensing on the cylinder wall during compression action. However, if an airline lubricator is
installed, the motor should cause no trouble as long as the amount of oil used can be controlled.