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FIGURE 1-32. Below Main Deck Aft HVAC Equipment (Sheet 5 of 6).

TM-55-1905-223-10 Landing Craft Utility (LCU 200 Class) NSN 1905-01-154-1191 Manual

FIGURE 1-32. Below Main Deck Forward HVAC Equipment (Sheet 6 of 6).

TM 55-1905-223-10

(7) Tunnel unit heaters UH-10 (42) and UH-4 (43)Unit heaters UH-10 are forced air electric

space heaters that provide heating to the aft and forward areas of the tunnel, respectively.

(8) Storeroom unit heater UH-11 (44).Unit heater UH-11 is a forced air electric space heater

that provides heating to the storeroom.

(9) Engine room unit heater UH-1 (45).Unit heater UH-1 is a forced air electric space heater

that provides heating to the starboard side of the engine room.

(10) Engine room operating station air conditioning unit AC-3 (46).r conditioning unit AC-3 is a

self-contained, 3-ton capacity air conditioner that provides conditioned air to the engine room operating station

only. Supply air for the self contained unit is provided through overhead ducting.

(11) Ventilation. Ventilation for the engine room is provided by the stack uptake. Engine room

supply air is provided by supply fans SF-1 and SF-2 located on the main weather deck. Exhaust ventilation for

the storeroom, tunnel, and machine shop is provided by watertight through-bulkhead vents with wire screens

and shutoff dampers. Inlet ventilation for the tunnel is provided by a through-bulkhead vent with wire screen

and shutoff damper.

Below Main Deck Forwar. The bowthruster room is located below the main deck forward and is

provided with the following heating and ventilation equipment (FIGURE 1-32, Sheet 6):

(1) Bowthruster room unit heater UH-5 (48).Unit heater UH-5 is a forced air electric space

heater that provides heating to the bowthruster room.

(2) Bowthruster room supply fan SF-4 (47). upply fan SF-4 is an axial fan with electric motor

V-belt drive that draws air in from the forecastle deck to the bowthruster room.

(3) Ventilation Ventilation for the bowthruster room is by natural exhaust ventilation through the

boatswains storeroom door vent on the main weather deck.

Heating

Three types of heating units are used on the LCU: duct heaters, unit heaters, and

(1) Duct heaters Duct heaters are flange type, installed in the ducting serving the pilothouse, 01

level, main deck, and engine room operating station.

(a) Duct heater DH-1. This heater is a Model TFZU, 19.1 kW type measuring 49.125

inches in width, and 23.875 inches in height. DH-1 is located inside the main accommodation air conditioning

unit AC-1. The unit provides pre-heating for accommodation spaces on the 01 level and main deck. Outlet air

from AC-1 flows over finned tubular electric heating elements aligned across the ducting leaving the air

conditioning unit. The heater will not energize without fan air flowing across the heating elements. Setting the

thermostat to a temperature above ambient will turn the air conditioner fan and duct heater on. The duct heater

cannot be energized while in the air conditioning (cooling) mode of operation.

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