TM 10-4520-262-12&P 0002 00
SPACE HEATER, CONVECTIVE (SHC)
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
The following are the major components of the Space Heater, Convective. A brief description of the
function of each component and its location is detailed below.
IN-TENT CONTROLLER ASSEMBLY (1). The in-tent control assembly (1) contains the operator controls
and advisory lights for the heater. The in-tent control assembly is a remotely wired, splashproof box that
can be easily attached to the tent framework. The in-tent controller assembly is only intended for use
inside the tent.
IN-TENT CONTROLLER CABLE ASSEMBLY (2). An in-tent controller cable assembly (2) is used to
connect the in-tent controller assembly to the heater.
BATTERY PACK ASSEMBLY (3). The battery pack assembly consists of a 12-volt battery (3) with an
electrical heating element. The battery pack assembly location is clearly marked and is located in a
recess (4) below the lower housing assembly. Two fuse holders (5) carrying 20 amp fuses are
incorporated into the side of the battery pack. Two spare fuses (6) are located at the breathable air inlet
end of the heater.
The battery is used for burner ignition, and to power the control system until the thermoelectric generator
(TEG) generates power. The battery is recharged during heater operation by the TEG. Depending on
battery condition and temperature, the battery has a approximate 30-minute recharge time.
If battery temperatures are below 40°F (4.4°C), it is electrically heated by the heating element. When the
battery reaches 60°F (15.6°C), the heating element is shut off by the controller. When battery heat is
called for, only excess power is used for heating the tent.
COMBUSTION AIR INLET ASSEMBLY (7). The combustion air inlet assembly (7) is connected to the
combustion air blower located inside the heater and is the source of outside air used for combustion by
the burner assembly.
UPPER HOUSING ASSEMBLY (8). The upper housing assembly (8) consists of a compartment cover
assembly having certain hardware and electrical wiring and connections mounted on it.
LOWER HOUSING ASSEMBLY (9). The frame and heater housing are welded together to form the lower
housing assembly (9).
FUEL SOLENOID VALVE ASSEMBLY (10). The fuel solenoid valve assembly (10) has a normally
closed valve which opens to allow fuel to enter the heater when the ON/OFF switch is in the ON position.
The solenoid valve is closed when the switch is turned OFF or if heater control assembly detects a
SYSTEM FAULT condition. This solenoid is independent of the fuel pump assembly described below.
FUEL QUICK DISCONNECT (11). A fuel quick disconnect (11) is located at the inlet side of the fuel
solenoid valve assembly (10). This military style male fitting has a protective dust cap (12) chained to it for
use when the heater is not connected to the fuel supply.
OPERATING INSTRUCTIONS PLATE. Operating instructions plate (13) is provided on the in-tent control
AIR SUPPLY DUCT WITH DEBRIS GRILL (14). The air supply duct with debris grill (14) conducts air
from the tent to heater assembly for warming. This duct is 10.5 inches in diameter and has a debris grill
(15) to prevent accidental entry of foreign objects into the heater assembly. A strap is used to connect the