TM 9-4520-251-14
1-10 EQUIPMENT DATA.
Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hunter Manufacturing Co.
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PH--400-G
Heated air output:
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400,000 Btu/hr @ -65°F (-54°C) ambient
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100,000 Btu/hr @ 70°F (21°C) ambient
Heated air temperature range:
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
280°F(138°C)
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°F(65.6°C)
Air delivery rate:
Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1500 cfm (0.707 cu m/s)
Minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
600 cfm (0.28 cu m/s)
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gasoline per MIL-G-3056
Fuel tank capacity (nominal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..34.5 gal(131 liters)
Overall dimensions:
Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 in. (1981 mm)
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 40 in. (1016 mm)
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 in. (1372 mm)
Shipping Cubit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70.3 cu ft(1.99 cum)
Weight, empty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .675 lb(306kg)
Engine (gasoline) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-HP2-4552
Engine speed, factory set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3450 t0 3750 rpm
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
1-11 HEATER OPERATING PRINCIPLES.
a.
b.
c.
d.
e.
f.
Engine (1) is set into operation by means of a starter rope. The engine speed is approximately
3600 rpm.
Engine (1) is direct-coupled to fan (2). A portion of the fan air is used for burning fuel,the remainder
is heated and forced out as hot air.
A belt from engine (1) drives fuel pump (3). The fuel pump pumps gasoline from fuel tank (4) into
the combustor section of heat exchanger (5) and supplies fuel to the engine.
In the combustor section of heat exchanger (5), fuel is sprayed through a nozzIe. Alongside the
nozzle is an igniter, which is similar to a spark plug. An altemator delivers high voltage to the igniter
to produce an electric arc. The arc keeps the-gasoline burning at the nozzle.
A combustion chamber in heat
exchanger (5) isolates air used
for burning fuel from space
heating air. Burning fuel fumes
and the gasoline engine ex-
haust are expelled through ex-
haust stack(6). Clean, heated
air blows out of heat exchanger
(5). Air duct hoses carry heated
air to the location to be heated.
Controls (7) allow adjustment of
the combustion flame for vari-
ous outlet air temperatures.
Gauges indicate air tempera-
ture and fuel level in the fuel
tank.
1-5
