TM 5-4520-256-14
Table 2-1. Control Panel, Controls and Indicators
KEY
CONTROL OR INDICATOR
FUNCTION
1
Audible Alarm (EM1)
Sounds whenever the heater is shut down
because of an overtermperature condition or
burner flameout
2
OFF/VENT/HEAT Switch (S1)
Used to place the heater unit into ventilation
or heat mode and to shutdown the heater
unit.
3
FUEL Pressure Gage
Provides a constant indication of the fuel
system pressure (in psi) of the fuel pump
output.
4
HOUR METER
Provides a continuous indication of the total
operating time of the heater unit in hours and
tenths of hours.
5
SAFETY RELEASE Indicator
Illuminates any time the safety relay (K8) us
tripped.
6
RESET Switch
This switch must be pressed to reset the
heater unit relay (K8) when the relay has
been tripped.
7
INTERNAL TANK/EXTERNAL
TANK Selector Switch (V1)
Used to select either the internal fuel tank or
the external fuel source (if) connected.
8
ON/OFF Switch (S7)
A toggle switch used to purge the fuel lines
or air.
9
Circuit Breaker (CB1)
Trips whenever an overcurrent condition
exists within the heater unit. Must be
manually reset by pushing in.
10
Temperature
Controller
Knobs
(See Figure 2-12)
Used to set output air temperature of unit
during the heating mode.
2-2
