TM 9-4520-251-14
4-28 RESTRICTION INDICATOR
This task covers:
a. Inspection
c. Service
b. Removal
d. Installation/Replacement
INITIAL SETUP
Tools
Tool kit, service, refrigeration unit
(Appendix B, Section Ill, Item 1)
Special Environmental Conditions
Adequate ventilation required during
cleaning.
Materials/Parts
Dry cleaning solvent (Item 15, Appendix E)
Restriction Indicator
Safety filter
General Safety Instructions
Do not operate heater in enclosed space. Adequate ventilation is re-
quired to prevent buildup of exhaust fumes which can be toxic in con-
centrated amounts.
Wear approved ear protection equipment within 25 feet (7.6 meters) of
operating heater. Failure to do so may result in impairment or loss of
hearing.
Location/Item
Action
Remarks
INSPECTION
1. Restriction
Observe window (1). If red is visible, follow proce-
indicator
dures in paragraph 4–27 to ensure that air filter is
(before startup)
clean. Press button (2) to reset.
4-63
