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 TM 55-1905-242-14
0012 00
Cooling Unit
Three cooling units are installed in the heating and air conditioning system. Two units, one port and one starboard, are
located in the wing walls of the accommodation module. The third unit is located under the pilothouse console, starboard.
The cooling units receive compressed, condensed refrigerant from the condensing units, allow the refrigerant to evaporate in
an evaporator core, and send the evaporated refrigerant back to the condensing units for compression and condensation.
The cooling units also contain fans, which draw in compartment air, pass that air over the evaporator core where it is cooled
by the evaporating refrigerant, and discharge the cooled air back to the compartment.
Refrigerant
An R-22 refrigerant is used in the system. The refrigerant is a Hydrochloroflourocarbon (HCFC), a Class II Ozone Depleting
Substance (ODS), and as such, requires special handling. Special handling instructions are contained in WP 0168 00.
Control Assemblies
Each cooling unit has its own control assembly mounted near the unit's outlet. The control assemblies have three rotary
knobs. The top knob controls the mode of operation. When in the OFF position, the unit is off. When in the FAN position,
the fan circulates air, but no heating or cooling is provided. When in the RUN position, the unit provides heating or cooling
as required. The middle knob controls fan speed. The bottom knob controls temperature. When the selected temperature
is lower than the compartment's ambient temperature, the unit enters cooling mode, and when the selected temperature is
higher than the compartment's ambient temperature, the unit enters the heating mode.
Raw Water Pump
A single raw water pump, mounted in the engine room, centerline, at frame 33 supplies raw water to cool all three condens-
ing units. The raw water pump draws water in from the sea chest at frame 31 starboard through a shutoff valve and a strainer.
The raw water pump discharges to a raw water manifold where it is distributed to the three condensing units. After passing
through the condensing units, the raw water is discharged overboard through the port side hull aft of frame 37.
VENTILATION SYSTEM
General
Forced air ventilation is provided to the accommodation module, the battery compartment, the water closet compartment,
and the engine room. All of these ventilation systems use fans to force air out of the compartments. Fresh air intake is by
natural flow.
ACC. MOD.
WATER CLOSET BLOWER
BLOWER (P/S)
(UNDER PILOTHOUSE DECK)
NATURAL
VENTILATION
NATURAL
NATURAL
VENTILATION
VENTILATION
ENGINE ROOM
BLOWER
WATER CLOSET
BLOWER EXHAUST
BATTERY
COMPARTMENT
BLOWER
0012 00-2
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