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 TM 55-1905-220-14-8
4-29. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(c) The receiver is a steel shell with steel dished heads welded at each end. The receiver collects the
liquid refrigerant drawing from the condenser. The shell is provided with refrigerant inlet and outlet connections
and a magnetic float type liquid level indicator for observing the refrigerant liquid level. General data on the
receiver is tabulated below.
Receiver Data
Carrier Assembly No.
8M15-314-3
Type Mounting
Horizontal
Refrigerant Capacity
120 lb. (54.43 kg)
Shell Diameter
10"
Overall Length
38-1/8"
(7) Evaporator
(a) The evaporator is that part of the system in which refrigerant is vaporized to produce refrigeration.
The types of evaporators used on shipboard is finned cooling coils mounted on bulkheads or in a unit (cold
diffuser) for cooling circulated air.
(b) The operation of the compressor maintains a reduced refrigerant pressure within the coils. At this
reduced pressure, the liquid refrigerant evaporates or boils at a temperature sufficiently low to absorb heat from
the air, fresh water or brine in contact with the outside of the coils.
(8) Heat interchanger.
(a) The heat interchanger is a shell and tube heat exchanger connected in the main suction and liquid
lines near the compressor. Within the interchanger, the cold suction gas is used to cool the warm liquid
refrigerant. This results in greater system capacity and efficiency. A liquid line bypass valve is usually
provided to isolate the interchanger should either: (a) a liquid leak develop in the suction line, or (b) the
compressor discharge gas temperature rise above 240 (115.60C).
F
(b) A heat interchanger is installed in the main suction and liquid lines leading from the condensing unit
to the air conditioning cooling coil. Suction gas circulates through the tubes of the interchanger while liquid
refrigerant passes through the shell. The cold suction gas cools the warm refrigerant thus increasing the
efficiency and capacity of the system. Liquid inlet and bypass stop valves are provided in the liquid lines to the
interchanger. Heat interchanger data is tabulated below.
4-844
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