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 TM 55-1905-220-14-8
4-29. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(5) Condenser.
(a) The condenser is a shell and sea water tube heat exchanger in which the compressed refrigerant gas
is condensed (liquefied) and lowered in temperature by the removal of heat.
(b) The condenser is of the multipass shell and finned tube type with circulating sea water flowing
through the tubes. The condenser is constructed of a steel shell with copper nickel finned tubes and tube sheet
and bronze water heads. The refrigerant vapor is admitted to the shell and is condensed on the outer surface
of the tubes. Sea water flow through the condenser is controlled by a water regulating valve in response to
changes in condenser refrigerant pressure. Operation of this valve is described in paragraph 4-29a(20).
General data on the condenser is tabulated below.
Condenser Data
Carrier Model No.
9W50-129-4
Shell Diameter
6-5/8"
Overall Length
57-9/16"
Effective Cooling Surface
50 sq. ft
No. of Tubes
26
No. of Passes
2
Tube Size
3/4" OD x.049W
Sea Water Quality (Design)
48 gpm (181.7 lpm)
(6) Receiver.
(a) Liquid refrigerant from the condenser drains into the receiver. The receiver serves as a liquid
refrigerant reservoir when there are surges due to load changes in the system; as a storage space when
pumping down the system; and as a liquid seal against the entrance of refrigerant gas into the liquid line.
(b) Receivers are provided with two bull's-eye sight glasses or with a magnetic, gauge type, liquid level
indicator for the observation of liquid level in the receiver. To maintain a liquid seal, there should always be a
minimum liquid level in the receiver when the plant is in operation. During shutdown, the refrigerant charge J is
pumped into the receiver so that only gas remains in the rest of the system.
4-843
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