TM 5-4520-241-14
Table 2-1. Controls and Receptacles
Fig.
and
Item
No.
Name
Operation and Use
1
EXTERNAL FUEL PUMP
Provides for the connection of an external fuel pump.
RECEPTACLE
2
POWER RECEPTACLE
Provides a connection for 120 VAC power to the heater;
includes radio interference filter.
3
ROOM THERMO receptacle
Provides for the connection of the remote thermostat which
controls heater operation.
4
HEATER-OFF-FAN switch
Control starting and stopping of the heater. In the HEATER
position the unit provides heated ventilating air. In the
FAN position the unit provides unheated ventilating air. In
the OFF position the unit will not function. When the
heater is switched to OFF while running, it will cool down
and then shut off.
5
White indicator light
Indicates that the unit is on and operating normally.
6
Red indicator light
Indicates that the unit has stopped because of ignition failure,
lack of fuel, or combustion blower failure.
7
RESET switch
When pressed, switch resets heater circuits and the heater will
repeat normal starting procedure.
8
FUEL OVERFLOW receptacle
When pressed, switch resets heater circuits and the heater will
repeat normally starting procedure.
9
FUEL RECEPTACLE
Provides for connection of a fuel supply.
10
CIRCUIT BREAKER
Provides for power disconnect if a short circuit occurs.
11
Louver operating handle
Controls position of lovers in louvered panels.
2-2