TM 9-4120-411-14
Figure 4-48. Crankcase Heaters (HR1 & HR8) (FDECU-2 ONLY).
b. Installation. See figure 4-48.
CAUTION
Crankcase heaters can be damaged if crankcase temperature sensor is not located
properly. Be sure temperature sensor is located under heater clamp area and not
under heater element area. If located under heater element area, the element will
kink and can short internally.
(1) Place crankcase heater (5) around compressor (4). Be sure crankcase temperature sensor (7) is under clamp, as
noted during removal, and not under heater element. Assemble crankcase heater clamp and tighten clamp screw
(8) to secure.
(2) Insert the two leads (3) that go to crankcase heater (HR1 or HR8) (5) into compressor (4). Connect wire leads
with four crimp nuts (6) per paragraph 4.16 using tags and wiring diagram figure 4-14. Remove tags.
(3) Install compressor cover (2) under reversing valve guard (9) then align mounting holes and secure with two
screws (1).
(4) Lower and secure cover per paragraph 4.2.
(5) Connect FDECU to power source and operate per paragraph 2.4.
4-117
