TM 9-4520-258-14
2-8.
OPERATING PROCEDURES - continued.
c.
Heat Manual Mode. The ASH Unit may be placed in the HEAT MANUAL mode by using the MODE
SWITCH. (Refer to Figure 2-8)
CAUTION
Do not attempt to operate the heater unit in the heating mode for
more than 10 minutes when ambient temperature is above + 100°F
(+39°C). Failure to comply may result in damage to equipment.
Operation in the VENT mode may be done at any temperature.
NOTE
If unit is presently operating in the HEAT AUTO mode, proceed to step (4).
(1)
Perform setup procedures in paragraph 2-7.
(2)
Operate the unit in the VENT mode by following the instructions in paragraph 2-8b.
CAUTION
Do Not attempt to operate the heater in the HEAT MANUAL mode if
ignition arc is not present. Damage to equipment may occur.
(3)
Look through the sight glass (2) to check for ignition arc. If ignition arc is not seen, do not attempt to
fire heater.
NOTE
If the ambient air temperature is below 0°F (-17°C), then wait 30-45
seconds prior to performing step (d).
(4)
Set MODE SWITCH (1) in the HEAT MANUAL position.
(5)
Look through sight glass (2) and ensure flame is present. If flame is not bright and steady, notify unit
maintenance.
(6)
Check fuel pressure at the fuel pressure gage (3). Proper pressure for elevation and voltage frequency
(50 or 60 Hz) is listed in Table 1-2. If pressure is not correct, notify unit maintenance.
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