TM 9-2320-260-34-2
17-25. PERSONNEL HEATER TESTING (Contd)
NOTE
Perform steps 6 through 39 for late model heaters.
6.
Ensure power source is disconnected. Turn two dzus fasteners (2) and remove guard (1) from
heater housing (3).
`7.
Loosen nut (4) and disconnect fuel tube (5) from fuel control valve outlet (7).
8.
Connect one end of fuel tubing (6) to fuel control valve outlet (7) and place other end in graduated
beaker or similar container.
9.
Disconnect lead (18) from shunt resistor (19) to disable the blower motor and igniter.
10.
Disconnect lead (12) from fuel control valve (16) to disable fuel control valve (16).
11.
Connect power source and place HI-LO switch to LO position.
NOTE
Have drainage container ready to catch fuel.
12.
Open bleed valve (17) on fuel control valve (16) to remove air from fuel flow. Close bleed valve (17)
when fuel flow is free of air bubbles.
13.
Connect lead (12) to fuel control valve (16).
14.
Disconnect lead (11) from fuel control valve (16).
15.
Partially raise lead (12) and place switch in START position.
16.
Connect jumper lead (14) to lead terminals (13) and ( 15). A clicking sound should increase in rate.
17.
Connect 50 in. (127 cm) long, 0.187 in. (0.474 cm) diameter clear tubing (20) to bleed valve (17) and
position the open end of tube (20) at least 45 in. (114 cm) higher than bleed valve (17). Open bleed
valve (17) and allow fuel to flow up the tube (20) until it stabilizes.
18.
From bleed valve (17) measure vertically the height of fuel. Fuel should be between 36-40 in.
(91-102 cm) from bleed valve (17). If adjustment is necessary, proceed to step 18. If not, proceed to
19.
Adjust height (regulated pressure) by turning the regulated pressure adjusting screw (10). If height
will not adjust or stabilize, then replace fuel control valve (16) (para. 17-16). Close bleed valve (17).
20.
Disconnect tube (20) from bleed valve (17).
21.
Disconnect jumper lead (14) from lead terminals (13) and (15).
NOTE
Low fuel flow rate must be set before high fuel flow can be set.
22.
Operate fuel pump for one minute and stop.
23.
Repeat steps 16 and 17.
24.
Disconnect jumper lead (14) from lead terminals (13) and (15).
25.
Record amount of fuel accumulated in graduated beaker. The fuel flow rate must be 0 or 10 cc per
minute.
26.
If flow is not within limits, turn adjusting screw (9) clockwise to lower flow rate or counterclockwise
to raise flow rate. If flow rate is not obtainable, replace fuel control valve (16) (para. 17-16).
27.
Place HI-LO switch in HI position.
28.
Operate fuel pump for one minute and stop.
29.
Repeat steps 16 and 17.
30.
Disconnect jumper lead (14) from lead terminals (13) and (15).
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