TM 5-4520-241-14
(1) Disconnect the power plug and open the access doors. Disconnect the red, yellow, grey, and white wires
from the transformer.
(2) Remove the screws and washers which secure the transformer to the heater case and remove the
transformer.
(3) Install a new transformer and secure it to the heater case. Connect the wires as shown in the wiring diagram.
Close the access doors, connect the power plug, and check for proper operation of the heater.
SECTION VIII. MAINTENANCE OF HEATER CASE ASSEMBLIES
4-24.
DESCRIPTION.
a. Heater Case. The heater case consists of a steel framework with a shelf and bulkhead which together form four
compartments.
b. Side Panels and Louver Linkage. Right and left side panels cover the entire area below the shelf. Both panels
are fastened with stud turnlock fasteners, and have louvers for air intake near the rear of the heater. A louver linkage
operated from the front panel of the heater controls the louver positions. When the handle is moved back and forth, one
set of louvers opens while the other closes.
c. Doors and Bottom Cover. An access door in the front panel and one on each side of the heater above the side
panels provide access to the most frequently adjusted and serviced components. The bottom cover, located on the side
opposite the discharge outlet, can be removed for additional air intake if the louvers do not provide enough air.
d. Data Plates. Data plates affixed to the heater case contain a wiring diagram and a circuit schematic diagram. A
U.S. government data plate is also provided. The manufacturer's operating data is imprinted on the cover of the control
box assembly.
4-25.
HEATER CASE ASSEMBLY.
a. Disassembly.
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be sure to disconnect the power plug before repairing the heater.
(1) A grommet (1, fig. 4-17) protects the ignition cable. If the grommet is cracked, worn, or damaged, work it out
of the bole in the heater case. Normally, the ignition cable need not be removed to replace the grommet.
4-49
