TM 5-4520-240-14
CHAPTER 2
OPERATING INSTRUCTIONS
WARNING
If equipment fails to operate, refer to
troubleshooting procedures in Chapter
Section I. OPERATING PROCEDURES
2-2. Controls and Instruments.
2-1. General.
Before operating the heater, you must become familiar
This section contains information and instructions for
with the controls and instruments provided on the unit.
the personnel responsible for operating this space
Refer to table 2-1 for a description of control features.
heater. The information includes starting and stopping
Refer to figures 2-1 and 2-2.
procedures, and basic heater operation.
Table 2-1. Controls and Instruments
Figure and
Operation and use
item number
Name
Houses a spare fuse which can be used if the in-circuit fuse blows out.
SPARE FUSE holder
1
FUSE holder
Houses the in-circuit fuse to protect electrical circuits from overload.
2
Provides a connector for 28-volt direct current input to the heater.
POWER receptacle
3
THERMO receptacle
4
Provides a connector for the room thermostat which controls heater opera-
tion.
RESET switch
5
When pressed, switch resets heater circuits after heater has stopped due to
ignition failure or lack of fuel.
Controls starting and stopping of heater. In ON position, heater will start
6
ON-OFF switch
and operate under control of room thermostat. When placed in OFF posi-
tion, switch stops heater operation, If motor blower is running when
switch is moved to OFF, heater will continue to run until coal, then shut
off.
Thermostat knob
Provides a means of selecting the temperature which heater is to maintain
in the enclosure. Rotate knob until desired temperature is aligned with
index mark.
NOTE
The thermostat provides only an on-off control of the heater. Raising the thermostat setting does not increase the heat output of
the heater per unit of operating time. It merely causes the heater to run longer to satisfy the heat demand. Setting the thermostat
to the highest setting at startup does not increase the rate at which the desired temperature will be reached, To prevent tem-
perature overshoot, set the thermostat only to the temperature de-sired for the enclosure.
2-1
