TM9-4120-398-14
(4) Insert the serrated end of the strap under the screw at the other end such as to engage the screw threads onto the
serrations (figure 4-4).
(5) Tighten the screw sufficiently to clamp the 7-foot duct securely onto the return fitting adapter port flange. Do
not overtighten; the duct will carry airflow at a relatively low pressure.
(6) Repeat steps (3) through (5) as necessary to attach the 9-foot flexible duct to the supply fitting.
(7) Repeat steps (3) through (6) as necessary to attach the 9-foot flexible ducts (supply) to the structure that will
receive the conditioned air. Figure 4-2 shows an air conditioner properly connected to a structure.
b. Drain Hose Connection. Condensate drain hoses are provided for connection to the drain outlets which are located in
the fork lift opening on each side of the unit. The 1/2 inch barbed hose connection is connected to the 1/4-female pipe fitting
and the hose is then attached to the barbed connector. During shipment the drain hose can be disconnected and placed in the
duct storage compartment along with the power cable.
Section III. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
a. Systematic, periodic, Preventive Maintenance Checks and Services ('PMCS) are essential to ensure that the air
conditioner is ready for operation at all times. The purpose of a preventive maintenance program is to discover and correct
defects and deficiencies before they can cause serious damage or complete failure of the equipment, Any effective preventive
maintenance program must begin with the indoctrination of operators to report all unusual conditions noted during daily
checks or actual operation to organizational maintenance. All defects and deficiencies discovered during maintenance
inspections must be recorded, together with corrective action taken, on DA Form 2404 (Equipment Inspection and
Maintenance Worksheet).
