TM 9-2320-260-34-2
17-25. PERSONNEL HEATER TESTING (Contd)
2.
Turn two dzus fasteners (6) and remove guard (5) from heater housing (11).
Disconnect lead (19) from 24-volt power source (20).
3.
NOTE
Disconnect igniter lead from circuit board for late model heaters.
Disconnect igniter lead (3) from ignition control unit (2).
4.
Remove nut-assembled lockwasher (15), shutoff valve lead (16), nut-assembled lockwashers (14),
5.
and thermostat lead (13) from overheat switch (12).
Connect hose (8) to bleed screw (4) on fuel control valve (7) and place other end of hose (8)
6.
in container (9).
Connect lead (19) to 24-volt power source (20).
7.
Open fuel shutoff valves (18).
8.
NOTE
Have drainage container ready to catch fuel.
Place switch (24) in LO position. Place switch (22) in START position and hold. Open bleed screw (4)
9.
and let fuel flow from bleed screw (4) until no air bubbles are observed in fuel.
Place switch (22) in OFF position. Close bleed screw (4).
10.
Install thermostat lead (13) and shutoff valve lead (16) on overheat switch (12) with nut-assembled
11.
Iockwashers (14) and (15).
NOTE
Connect igniter lead to circuit board for late model heaters.
Connect igniter lead (3) on ignition control unit (2).
12.
b. Ignition Test
NOTE
Ignition time is the interval from activating control box switch to
START position until indicator lamp illuminates.
1. Place switch (22) in START position and hold. Record time interval from activating switch (22)
until indicator lamp (23) illuminates. During this time interval, record ignition amperage on
multimeter (21).
2. If ignition time exceeds three minutes, or if ignition amperage exceeds 15 amperes, check fuel flow
components and replace damaged parts (paras. 17-15 through 17-22, as necessary).
3. Place switch (22) in OFF position.
C.
Flame Detector Switch Test
1. Place switch (22) in START position and hold.
2. When indicator lamp (23) illuminates, place switch (22) in RUN position.
3. If indicator lamp (23) does not light, adjustor replace flame detector switch (1) (para. 17-15).
4. Place switch (22) in OFF position. Burning should stop within thirty seconds and blower motor (10)
within three minutes. Replace or adjust flame detector switch (1) (para. 17-15) if time exceeds limits.
d. Fuel Control Valve Testing
1. Place switch (22) in START position and hold.
2. When indicator lamp (23) illuminates, place switch (22) in RUN position.
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