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 TM 55-1905-220-14-1
i. The Heat Interchanger is a shell and tube heat exchanger connected to the main suction and liquid lines near the
compressor. Inside the interchanger, the cold suction gas is used to cool the warm liquid refrigerant. This causes greater
capacity and efficiency in the system. A liquid line bypass valve is usually provided to isolate the interchanger in case a
liquid leak develops in the suction line or the compressor discharge gas temperature rises above 240'F
(115. 60C) .
j. The Dryer is installed in the main liquid line or in a bypass. It is a cylinder containing renewable cartridges filled
with activated alumina or silica gel. The dryer is used to keep the system free of moisture.
k. The dryer continues working at all times after it has been installed in the main liquid line. When installed in a
bypass, it is used for charging refrigerant or for freeing the system of moisture. If the system is properly purged and
dehydrated when first installed, and operated carefully, the dryer will only be used when drying.
l. Some dryers come with a "dry-eye" or moisture indicator. It consists of a paper disc visible through a sight glass.
The paper disc changes in color from blue to pink. A blue color indicates there is an acceptable level of moisture in the
refrigerant. A pink color indicates too much moisture and the cartridges should be replaced with dryer ones.
m. Fresh air is taken in through air intakes at Frame 33 at the deckhouse and passes over the cooling coils. A
circulation fan moves the cooled air to the pilothouse, galley mess, crew berthing and stateroom. Condensation from the
cooling coil drains to the bilge.
n. The Sea Water Cooling Pump circulates water through the condenser and out the overboard discharge.
o. The control for the Air Conditioning System is located in the air conditioning room on the forward side of
bulkhead 33, above the air conditioning condenser.
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