TM 5-4520-253-13
CHAPTER 2
OPERATING INSTRUCTIONS
Section I. DESCRIPTION AND USE OF OPERATOR’S CONTROLS AND INDICATORS
2-1. OPERATOR CONTROLS AND INDICATORS
Key
1
2
3
4
Table 2-1. Controls and Indicators
White HEAT light
Red FAULT light
Control or Indicator
HEATER-OFF-FAN
switch
RESET circuit
breaker
Function
Starting and stopping of heater. HEATER position circulates heated
air. FAN position circulates unheated air. When switched to OFF from
HEATER position, heater continues to run until heater has cooled.
Indicates heater is in HEAT mode.
Indicates heater has stopped because of:
a. Ignition failure.
b. Lack of fuel.
c. Combustion blower failure.
Resets heater circuits causing heater to repeat normal starting
procedure.
Change 2
2-1
