TM 10-3510-208-12
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Check for a cracked, broken or leaking fuel pump.
Refer to instructions a. and b., listed under step 2. of 7. WATER HEATER FUEL PUMP FAILS TO
DELIVER FUEL, and replace the fuel pump.
12. PULSATING FLAME
Step 1. Check the air shutter to see if the vent holes are blocked.
Adjust the shutter by depressing the pin and spring and moving the shutter up or down until a near clear
smoke emits from the exhaust duct. Approximately 1/2 of total opening.
Step 2. Check fuel level.
Fill fuel supply drum, if low.
Step 3. Check for water in fuel by draining some fuel and checking for bubbles.
Drain and refill fuel supply drum if water is evidenced in fuel.
13. BURNER SMOKES
Step 1. Check the air shutter to see if the vent holes are blocked.
Adjust the shutter by depressing the pin and spring and moving the shutter up and down until a near clear
smoke emits from the exhaust duct. Approximately 1/2 of total opening.
Step 2. Check the fuel pressure for being too high or too low. With the fuel pressure control valve (fig. 2--2 (sheet 1 of 2)) turned
counterclockwise (shut} and the burner control valve clockwise (shut) the gage should register 100 pounds per square
inch (7.03 kg per sq cm).
Adjust the fuel pressure as follows:
NOTE
Adjustment must be made with the fuel pump operating.
b. Turn the pressure regulating setscrew clockwise to increase the pressure, and turn it counterclockwise
to decrease the pressure on the pump.
c. Replace the adjusting screw end cap on the pump.
14. WATER LEVEL LOW
Step 1. Start the water pump (fig 3-2 (sheet 4 of 4)) and check for proper operation, refer to paragraph 2-36. (4).
Rated capacity of water pump is 18 to 20 gpm (gallons per minute) (68.4 to 76 liters) at 65 foot head.
Fill heater and maintain pressure, paragraph 2-3b. (4).
Step 2. Check for leaks.
Tighten connections or replace hose.
Step 3. Check for the drain valve being opened (it is open when the valve dump lever is all the way to the right of the "open"
mark).
Close the valve by swinging the lever to the left of the "open" mark.
15. WATER PUMP FAILS TO DELIVER WATER
Step 1. Check for reversed rotation.
Interchange any two external leads at the motor.
Step 2. Check for a clogged or defective impeller,
Refer to the following instructions and clean or replace the impeller.
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