TM 9-4120-411-14
1.6 WARRANTY INFORMATION. The FDECU is warranted for a period of one (1) year from the date the unit was
accepted, via signed DD Form 250, and allows for a maximum of sixty (60) days from the date a defect is
discovered/reported. Report all defects to your supervisor, who will take appropriate action.
1.7 CORROSION PREVENTION AND CONTROL (CPC). It is important to report any corrosion problems with this item
so the problem can be corrected and improvements made to prevent it in future items. While corrosion is typically
associated with rusting of metals, it can also include deterioration of other materials, such as rubber and plastic. Unusual
cracking, softening, swelling, or breaking of these materials may be a corrosion problem. If you find a corrosion problem,
report it on an SF368 (Product Quality Deficiency Report). Using key words like corrosion, rust, deterioration, or cracking
will help ensure identification as a CPC problem. Submit the form to the address specified in DA PAM 738-750.
1.8 REPAIR PARTS, TOOLS, TEST, MEASUREMENT, DIAGNOSTIC EQUIPMENT (TMDE), AND SUPPORT
EQUIPMENT. Repair parts are listed and illustrated in TM 9-4120-411-24P covering unit, DS, and GS maintenance for
the FDECU. For authorized common tools and equipment, refer to the Modified Table of Organization and Equipment
(MTOE), CTA 50-970, or CTA 8-100, as applicable to your unit. All common and special tools as well as TMDE and
support equipment are listed in Appendix B and Appendix F of this manual as applicable.
Section II. EQUIPMENT DESCRIPTION AND DATA
1.9 CHARACTERISTICS, CAPABILITIES, AND FEATURES.
1.9.1 The FDECU is a horizontally configured electric motor driven heat pump. The unit uses integral supplemental
resistance heaters during system defrost and low ambient temperature conditions.
1.9.2 The unit will circulate and filter the air as well as provide fresh make-up air as desired.
1.9.3 The unit is designed for use while directly exposed to the environment and will operate with filter blower
overpressure systems developed for use in Nuclear/Biological/Chemical (NBC) environments.
1.10 DIFFERENCES BETWEEN MODELS. The FDECU-2 uses two compressor crankcase heaters that are wrapped
around the compressor and a compressor warm up indicator light on each of the control panels to indicate heater
operation. Units after the FDECU-2 do not have compressor crankcase heaters or compressor warm up indicator lights.
The FDECU-4 and thereafter are lighter weight due to manufacturing process changes and the use of a lighter
compressor. The new compressor is placed on resilient mounts and stabilized with a cushion clamp to reduce vibration
and sound levels.
1.11 IDENTIFICATION PLATES. Refer to figure 1-2.
1-2 Change 1
