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TM 9-4120-367-14
TM 07592B-14/1
c. Operate on the heating mode in ambient temperatures as low as minus 50°F (10°C) and as high as plus 80°F
(26°C).
d. Start and operate on coding mode at 0°F (-18°C) ambient temperature, with air at plus 70°F (21°C) entering
the evaporator.
1.7.6
Evaporator Airflow. With MODE SELECTOR set at VENT and the FAN SPEED set at HIGH, the evaportator
air flow will be as follows:
m3/m
F18H
590
16.5
F18H-3
590
16.5
F18H-4
640
17.9
1.8
1.8.1
a.
b.
c.
d.
e
f.
g.
h.
i.
j.
k.
l.
m.
1-4
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.
Equalizing Solenoid Valve. This solenoid valve causes discharge and suction pressures to equalize whenever
compressor is not operating.
Liquid Line Solenoid Valve. This solenoid valve controls flow of liquid refrigerant to the evaporator coil.
Quench Expansion Valve. This valve controls expansion of liquid refrigerant to gas in the suction line when the
suction line super heat rises above 31 to 33°F (-1 to +1°C).
Drier/Filter (Dehydrator). A drier/filter (dehydrator) is a device used to remove water or water vapor from the
refrigerant.
Receiver. The receiver is a storage tank for liquid refrigerant.
Condenser Coil. It is constructed of interconnected parallel tubes which are retained in a series of multiple, close-
ly spaced fins. Hot compressed gas is air cooled to a liquid in this coil.
Compressor. It consists of a reciprocating compressor driven by an electric motor, hermeticall sealed into a steel
container with a lifetime charge of oil. A crankcase heater surrounds the lower part of the container. The heater
is thermostatically controlled to prevent migratiom of liquid refrigerant into the crankcase where it would become
mixed with the oil.
Pressure Regulator Valves. The pressure regulator valves are part of the hot gas bypass circuit and open when
the compressor suction pressure drops below a preset level of 68 psig (4.78 kg/cm2).
Relief Valve. The relief valve opens when the discharge Iine pressure rises above 540 psig (37.97 kg/cm2).
Actuating Cylinder. This hydraulic cylinder operates discharge louver assembly. It will start to open the louver
assembly at 150 to 180 psig (10.55 to 12.66 kg/cm2) and fully open louver assembly at 220 to 260 psig (15.74
to 18.28 kg/cm2) compressor discharge pressure to allow unit operation when outside temperature is low.
Charging Valve. The charging valves provide connection ports so that refrigerant can be put into the system.
They also provide poets for checking system operating pressures.
Condenser Fan and Motor. This fan and motor draws outside air over and through the condenser coil in order
to remove the heat from the hot gas entering the condenser coil.
Input Power Receptacle (alternate location). Connection for power supply.
M o d el
S C F M
Condenser Section (See figure 1-2.).
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