5-4. HEAT EXCHANGER MAINTENANCE - Continued.
Carbon Monoxide Testing - Continued
Draw a sample of ventilating air according to the procedures of the carbon monoxide tester being used.
Replace the heat exchanger if carbon monoxide in the ventilating air stream is in excess of 0.005
percent or 50 parts per million.
5-5. FUEL TANK MAINTENANCE.
This task covers:
Tool Kit, General Mechanics
Cleaning Solvent (Item 11, Appendix E)
Cleaning solvent, Federal Specification P-D-680, is toxic and flammable. Use only in a well-
ventilated area. Avoid prolonged breathing of fumes. Keep solvent away from flames. Do not
use in excessive amounts. Avoid skin contact.
Heater unit shut down and cool.
Power cable disconnected from power source.
Exhaust pipes removed from storage compartment (para 2-6).
Duct assemblies removed (para 3-12a).
Fuel level gage removed (para 3-41a).
Duct covers removed (para 5-3).
Cabinet assembly and skid removed (para 5-3).
(1) Lift fuel tank (1) from skid (2).