Unit Preventive Maintenance Checks and Services (PMCS)
Quarterly Schedule - continued
Item to be
To avoid injury, compressed air used for
cleaning purposes must not exceed 30 psi
a. Blow accumulated dust and dirt out of air passages in
evaporator coil (12) using compressed air. Blow from
front to back in opposite direction from operational airflow
b. Inspect coil (12) for obvious damage and all mounting
hardware for tightness and security. Straighten any bent
a. Wipe any remaining dust or dirt from heating elements
(13), heater thermostat, and all other components and
surfaces in the area.
Use a clean, dry cloth (or one slightly
m o i s t e n e d with water) for all wiping
operations. NEVER use an oily or greasy
cloth, oily residue left on any surface will
attract and accumulate much more dust and
dirt than dry surfaces.
b. Inspect heating elements (13) and thermostat for obvious
damage and all mounting hardware for tightness and
c. Inspect wiring harness for damage or chafing and all
electrical connections for tightness.
d. Install mist eliminator and conditioned air supply louver.