Table 4-2. TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check to see if draft is low or down.
Correct draft if required
Step 3. Check to see is air inlet or flue is restricted
Remove restriction
3. HEAVY SOOT DEPOSIT IN BURNER OR FLUE PIPE.
Step 1. Check to see if draft is correct.
Correct draft.
Step 2. Check to see if correct grade of fuel is being used.
Change fuel if incorrect grade is being used.
Step 3. Check to see if too much fuel is flowing at high fire setting.
Reduce fuel flow.
Step 4. Check to see if low fire segment or burner rings are warped or burned out of shape.
Replace, if required.
Step 5. Check to see air inlet or flue is restricted.
Remove restriction
4. FLUCTUATING FLAME.
Check to see if draft is correct
Correct draft if required.
5. SMOKY FLAME.
Step 1. Check to see if draft is correct.
Correct draft if required.
Step 2. Check to see if air holes in burner are clogged.
Clean burner if required.
Step 3. Check to see if low fire segments or burner rings are warped or burned out of shape.
Replace as necessary.
Step 4. Check to see if air inlet or fuel is restricted.
Remove restriction
6. OIL OR GAS ODOR.
Step 1. Check to see if proper grade of fuel is being used.
Change fuel if incorrect grade is being used.
Step 2. Check to see if draft is correct.
Correct draft, if required.
Step 3. Check fuel pipe joints.
Tighten pipe joints if required.
Section VI. MAINTENANCE OF FUEL SYSTEM
4-12. General
a. The heater fuel system is designed to burn fuel oil conforming to specification VV-F-800, class DF-1, DF-2, or
DF-A having a cloud point not lower than -55F.
b. A siphon provides a constant flow of fuel from a standard military rectangular can to a constant level control
valve. Fuel flows through a wire mesh strainer within the control valve. The fuel is metered out to the burner in a
regulated amount.
4-13. Control Valve
a. Removal and Installation.
(1) Heater must be shut off and cool. Depress valve trip lever on fuel control valve (fig. 2-4 (2)) to shut off fuel
flow.
(2) Lift and remove the siphon assembly (fig. 4-1) from the fuel can and the siphon drain assembly (27, fig. 4-2).
(3) Disconnect both fuel lines (25) and (26). Depress valve trip lever (fig. 2-4 (2)) on fuel control valve and allow
oil to drain from the valve.
(4) Remove two bolts from the base of the control valve (24, fig. 4-2), remove valve. To install new valve,
reverse procedure. Securely tighten connections and check for leaks.
b. Removal and Installation (Models 441-4ABJ and 444-4A).
(1) Heater must be shut off and cool. Raise the reset lever of the fuel control valve to shut off fuel.
(2) Repeat steps (2), (3), and (4) above.
c. Cleaning and Inspection.
4-3
