TM 10-4330-236-13&P2-6.OPERATING PROCEDURES - continued.f. Heat Adjusting. (Refer to Figure 2-19). When the defrost shroud (1) is used to prevent water freezing in thefilter-separator sump, heating from the system pump is adjusted by positioning the defrost door (2) on the shroud.WARNINGTo avoid bums, wear hand protection when adjusting defrost door. The door and shroud may bevery hot.(1)The adjustment bracket (3) on shroud (1) provides four positions for adjusting the defrost door (2).CAUTIONNever fully close the defrost door during system operation This would apply excessive backpressure to the pump assembly exhaust, which could result in engine damage.(2)Adjust heat by moving the bar (4) attached to the defrost door (2) to the selected notch. The first notch(fully open) position on the adjustment bracket (3) provides the least heat and the fourth notch (fullyclosed) position provides the most beat.Figure 2-19. Heat Adjusting.2-34
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