TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 701 of 764
TM 9-2320-361-34
17-20. FUEL BURNING PERSONNEL HEATER TESTING
(Contd)
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Turn two
dzus fasteners (11) and remove guard (5) from heater (13).
Disconnect lead (18) from 24-volt power source (20).
Disconnect igniter lead (7) from ignition control unit (6).
Remove nut-assembled lockwasher (1), shutoff valve lead (2), nut-assembled lockwasher (15), and
thermostat lead
(14)
from overheat switch (3). Discard nut-assembled lockwashers (1) and (15).
Connect hose (10) to bleed screw (8) on fuel control valve (9) and place other end of hose (10) in
container (12).
Connect lead (18) to 24-volt power source (20).
Open fuel shutoff valves (17).
NOTE
Have drainage container ready to catch fuel.
Place switch (23) in LO position. Place switch (21) in START position and hold. Open bleed screw (8)
and let fuel flow from bleed screw (8) until no air bubbles are observed in fuel.
Place switch
(21)
in OFF position. Close bleed screw (8).
Install thermostat lead (14) and shutoff valve lead (2) on overheat switch (3) with new nut-
assembled lockwashers (15) and (1).
Connect igniter lead (7) on ignition control unit (6).
NOTE
Ignition time is the interval from activating control box switch to
START position until indicator lamp illuminates.
Place switch (21) in START position and hold. Record time interval from activating switch (21) until
indicator lamp (22) illuminates. During this time interval, record ignition amperage on
ammeter (19). Place switch (21) in OFF position.
If ignition time exceeds three minutes, or if ignition amperage exceeds
15
amperes, check fuel flow
and
replace damaged parts (paras. 17-11 through 17-18, as necessary).
b. Flame Detector Switch Test
1.
Place switch
(21)
in START position.
2. When indicator lamp (22) illuminates, place switch (21) in RUN position.
3. If
indicator lamp (22) does not light, adjustor replace flame detector switch (4) (para. 17-15).
4. Place switch
(21) in
OFF position.
c.
Fuel Control Valve Testing
1.
2.
3.
4.
5.
17-58
Place switch (21) in START position.
When indicator lamp (22) illuminates, place switch (21) in RUN position.
Check fuel consumption at flowmeter (16). Fuel consumption should be 10-13 cc/min at low heat,
and 19-24 cc/min at high heat. If fuel consumption rate is not within limits, replace fuel control
valve (9) (para. 17-12).
Check operating amperage at ammeter (19). If operating amperage exceeds 10 amperes, check
heater wiring and replace damaged parts (para. 17-11 through 17-18, as necessary).
Place switch (21) in OFF position.
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