TM 5-4610-218-12
Figure 2-21. Black-out switch, installed on door frame.
(2) Purpose. It is a toggle switch having
heater.
three positions which control heating, ventilating,
b. Louver Handle.
and stopping.
(1) Location The heater louver handle is lo-
cated on the heater above the control box.
a. Heater Reset Button.
(2) Purpose. It is used to open and close the
(1) Location. The heater reset button is lo-
heater louver, to control the amount of ventilation
cated on the upper right-hand side of the heater
to the heater.
control box.
c. Indicator Light.
(2) Purpose. It is used to restart the heater
(1) Location. The white heater indicator
manually.
light is located on the upper left-hand corner of the
g. Thermostat.
heater control box.
(2) Purpose. It lights when the heater is
attached to the ceiling of the van body in the rear
turned on and stays lit while the heater is oper-
corner.
ating.
(2) Purpose. The thermostat, when set by
d. Warning Light.
hand at a temperature above the ambient tem-
(1) Location The heater warning light is a
perature, controls the operation of the heater to
red light located on the upper right-hand corner of
maintain the set temperature.
the heater control box.
(2) Purpose. The light comes on auto-
2-17. Chemical Solution Feeder Lever Arms
matically when the heater fails to start or run, due
and Indicators.
to lack of fuel or ignition.
a. Feed Indicators.
e. Heater Toggle Switch.
(1) Location. The heater toggle switch is lo-
are mounted on the lever arms, pointing toward the
cated on the left-hand side of the heater control box.
two feed scales.
(2) Purpose. The position of the two feed in-
2-51
