b. The heater draws in fresh, cool air through the adjustable louvered side panels of through the return air opening in
one end of the heater case if the side panels cannot be used. Combustion air is fed to the burner by a combustion motor.
Circulating air is blown across the heat exchanger by the ventilating motor fan, and discharged through a screen at the
discharge outlet of the heater.
c. The heater is equipped with a time delay ignition control (flame failure shutdown) to provide for safe, thermostat-
controlled starting without continuous operator supervision. If proper ignition does not occur within a predetermined time,
power is shut off and manual reset is required. This minimizes the danger of fire or explosion, and protects the heater
from damage in case of equipment malfunction or loss of fuel supply.
d. When the heater is operating, another safety control shuts off the flow of fuel if the heater exceeds a preset
overheat temperature. The heater will automatically restart when it cools to just below the overheat temperature.
e. The maintenance paragraphs of this manual contain detailed descriptions of heater components.
IDENTIFICATION AND TABULATED DATA.
a. Identification. The heater has four major identification plates. These are:
(1) The manufacturer's data/operating data plate (fig. 1-1) lists information regarding the model number, serial
number, electrical characteristics, and heat output. It also provides brief operating instructions. The data plate is an
integral part of the control box cover.
(2) The U.S. Government identification data plate (fig. 1-2) lists the heater's nomenclature national stock number,
manufacturer's part number, manufacturer, contract number, assembly date, serial number, and weight.
(3) The circuit schematic data plate (fig. 1-2) shows the major components of the heater and how they are
functionally interconnected. It is mounted on one side access door. Refer to figure 1-3 for a detailed view of the circuit
(4) The wiring diagram data plate (fig. 1-2) shows all of the electrical connections inside the heater. It is mounted
on one side access door. Refer to figure 1-4 for a detailed view of the wiring diagram.
b. Tabulated Data. Tabulated data applicable to the space heater and its components is listed in Table 1-1.