CHAPTER 4 UNIT MAINTENANCE INSTRUCTIONS

Section III. OPERATOR MAINTENANCE PROCEDURES - TM-9-4120-411-140039

Section I. SERVICE UPON RECEIPT - TM-9-4120-411-140041

TM-9-4120-411-14 Field Deployable Environmental Control Unit Models FDECU-2 FDECU-3 and FDECU-4 (NSN 4120-01-449-0459) Manual Page Navigation
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TM 9-4120-411-14

CHAPTER 4

UNIT MAINTENANCE INSTRUCTIONS

SECTION/PARAGRAPH

TITLE

PAGE

Section I

Service Upon Receipt ......................................................................................................................

4-2

4.1

Site Requirements .........................................................................................................................

4-2

4.2

Raising And Lowering Cover ...........................................................................................................

4-4

4.3

Service Upon Receipt Of Materiel ...................................................................................................

4-5

4.4

Installation Instructions ...................................................................................................................

4-5

4.5

Preliminary Servicing And Adjustment Of Equipment ........................................................................

4-14

Section II

Unit Preventive Maintenance Checks And Services ...........................................................................

4-14

4.6

Introduction ...................................................................................................................................

4-14

Section III

Unit Troubleshooting Procedures ....................................................................................................

4-17

4.7

Introduction ...................................................................................................................................

4-17

4.8

Access For Troubleshooting ............................................................................................................

4-17

4.9

Logic Control Details ......................................................................................................................

4-18

4.10

Temperature Potentiometer Settings ...............................................................................................

4-25

4.11

Thermistor Temperature Sensors Testing .........................................................................................

4-25

4.12

General Troubleshooting Procedures ..............................................................................................

4-27

4.13

Secure Electrical Assembly .............................................................................................................

4-31

Section IV

Unit Maintenance Procedures .........................................................................................................

4-31

4.14

Frame Cover Assembly Replacement .............................................................................................

4-31

4.15

Outside Fan Replacement ..............................................................................................................

4-33

4.16

Electrical System General Repair ....................................................................................................

4-34

4.17

Outside Fan Motor Replacement .....................................................................................................

4-45

4.18

Handle Replacement ......................................................................................................................

4-47

4.19

Latch Hinge And Latch Hinge Doubler Replacement ........................................................................

4-48

4.20

End Panel Replacement .................................................................................................................

4-49

4.21

Access Panel Replacement .............................................................................................................

4-50

4.22

Rear Screen Replacement ..............................................................................................................

4-51

4.23

End Screen Replacement ...............................................................................................................

4-52

4.24

Front Screen Replacement .............................................................................................................

4-53

4.25

Supply Panel Replacement .............................................................................................................

4-54

4.26

Electrical Assembly Replacement ....................................................................................................

4-55

4.27

Power Box Assembly Replacement .................................................................................................

4-61

4.28

Capacitors (C7 Thru C9) Replacement ............................................................................................

4-66

4.29

Capacitors (C1 Thru C6) Replacement ............................................................................................

4-68

4.30

Relays (K1 Thru K5) Replacement ..................................................................................................

4-70

4.31

Overload Relays (K7 & K8) Replacement ........................................................................................

4-72

4.32

Large Overload Relay (K6) Replacement .........................................................................................

4-74

4.33

Electrical Assembly Mounting Bracket And Slide Repair Or Replacement ...........................................

4-76

4.34

Magnetic Proximity Switch (S1) Replacement ..................................................................................

4-79

4-1

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