TM 9-4520-258-14
2-2.
LOCATION AND USE OF CONTROLS AND INDICATORS.
a.
FRONT and RIGHT SIDE controls and Indicators. (Refer to Figure 2-1)
(1)
DAMPER (1) allows fresh air to enter the unit's supply air system.
(2)
HOUR METER (2) indicates the total number of hours the burner has been operated.
(3)
MODE SWITCH (3) is used to place the heater unit in the VENT, AUTO HEAT, MANUAL HEAT or
OFF mode.
(4)
POWER LIGHT (4) illuminates when power to the heater is available, the power circuit breaker is set
and the mode switch is moved to the VENT, AUTO HEAT or MANUAL HEAT position.
(5)
HIGH TEMP (5) light illuminates any time the heater discharge air exceeds the limit of the temperature
limit switch setting.
(6)
FLAME OUT (6) light illuminates any time there is a burner flame out during unit operating in the
heating mode caused by a lack of combustion when the controls require heat.
(7)
FLAME RESET (7) switch is pressed to reset the burner control relay (Ki).
(8)
PURGE SWITCH (8) is used to purge air from the fuel system.
(9)
THERMOSTAT CIRCUIT BREAKER (9) trips whenever an overcurrent condition exists with the
remote thermostat circuit. Must be manually reset by pushing in.
(10)
POWER ON CIRCUIT BREAKER (10) protects the electrical circuits whenever an overcurrent
condition exists within the heater unit. Must be manually reset by pushing in.
(11)
FUEL PRESSURE GAGE (11) provides a constant indication of the fuel system pressure (in psi and
kilobars) of the fuel pump output.
2-2
