TM 9-4520-258-14
2-8.
OPERATING PROCEDURES- continued.
b.
Heat-Auto Mode (Refer to Figure 2-7)
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.
(1)
Perform assembly and preparation for use procedures in paragraph 2-7.
(2)
Operate the unit in the VENT mode by following the instructions in paragraph 2-8a.
CAUTION
Do Not attempt to operate the heater in the HEAT AUTO mode if
ignition arc is not present. Damage to equipment may occur.
(3)
Look through the sight glass (1) to check for ignition arc. If ignition arc is not seen, do not attempt to
fire heater. The arc should be steady and bright blue in color.
NOTE
If the ambient air temperature is below 0°F (-17. 8°C), wait 30 to 45
seconds prior to performing step (4).
If the burner does not ignite within 15 seconds after mode switch is
placed in the HEAT AUTO position or if burner goes out during
heating mode, the FLAME OUT light will come on.
(4)
Set the MODE SWITCH (5) to the HEAT AUTO position.
(a)
If the FLAME OUT light (6) comes on wait 30 seconds and depress the FLAME RESET button
(7).
(b)
If FLAME OUT light comes on after three attempts to reset, notify unit maintenance.
(5)
Set remote thermostat (2) at least 3°F above ambient temperature. Depress the up arrow (3) to
increase setting or the down arrow (4) to decrease setting.
(6)
Check fuel pressure at the fuel pressure gage (8). 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.
2-26
