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 TM 55-1905-223-10
(3) Convection heaters One 1 kW convection heater (CH-1) and three 0.5 kW convection
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heaters (CH-2, CH-3, and CH-4) are installed on the LCU. CH-1 is a Model DFM 11.0-1 and CH-2 through CH-
4 are Model DFM 10.5-1. Each is a reflecting type bulkhead mounted heating unit. Each unit is equipped with
an on/off switch, a temperature controlling thermostat knob, and a manual high limit reset pushbutton switch.
The high limit thermostat is set to open at 350 and close at 190 when reset.
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h.
Ventilation In addition to forced supply air provided to accommodation compartments by the fan in
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air conditioning unit AC-1 and ducting, specified areas of the LCU are provided with forced air ventilation. The
LCU compartments provided with only forced air ventilation are:
(1) 01 Level. The 01 level main toilet and sick bay rooms are provided exhaust ventilation by
toilet and sick bay exhaust fan EF-4 located on the pilothouse deck (02 level).
(2) Main deck The paint locker room is ventilated by exhaust fan EF-7. The galley is supplied
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with forced supply air by supply fan SF-6 and ventilated through the galley hood by exhaust fan EF-6 located
on the pilothouse deck (02 level). The emergency generator room is provided forced supply air by supply fan
SF-5.
(3) Below main deck The engine room is provided forced supply air by supply fans SF-2 (port)
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and SF-1 (starboard) located on the main weather deck. Forced air ventilation for the engine room is provided
by exhaust fans EF-2 (port) and EF-1 (starboard) located in the stack on the pilothouse deck (02 level). The
machine shop, tool locker, storeroom, engine room operating station, and tunnel receive forced supply air from
supply fan SF-3 located in ducting in the machine shop area. The bowthruster room is provided forced supply
air by supply fan SF-4 located in the bowthruster room. The steering gear room is provided forced air
ventilation by exhaust fan EF-3 located in the steering gear room.
i.
Air Conditioning Air conditioning is provided by the accommodation air conditioner AC-1,
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pilothouse air conditioner AC-2, and engine room operating station air conditioner AC-3.
(1) Accommodation air conditioner AC-1 AC-1 is a 15-ton, Model LSL-106 unit consisting of
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condenser, blower motor, and compressor with a nominal cooling capacity of 180,000 Btu at 40 suction
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temperature and 110 condensing temperature. Cooling air or air only is forced out by a belt driven blower
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motor via ducting to specified rooms and passageways of the 01 level and main deck. Return air is routed
through door louvers and grills, bulkhead grills, passageways, and ducting back to the unit. Seawater is routed
to the unit condenser to absorb heat given off by the system refrigerant and routed back out through the
seawater discharge line. A seawater regulating valve automatically controls seawater flow through the
condenser to maintain a relatively constant condensing pressure and temperature.
(2) Pilothouse air conditioner AC-2. AC-2 is a self-contained 3-ton, Model KC 33 D vertically
mounted unit consisting of condenser, blower motor, and compressor with a nominal cooling capacity of 36,000
Btu. In the cooling mode of operation, refrigerant is directed from the compressor to the water-to-refrigerant
condenser when the ambient temperature is above the external thermostat setting. Seawater is routed to the
unit water inlet through a seawater regulating valve. The seawater
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