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 TM 55-1905-223-10
(b) Duct heater DH-2. DH-2 is a Model CHMS-3-F, flanged metal sheath element type
utilizing fins for heat transfer. DH-2 is located in the ducting just above air conditioning unit AC-2 in the pilot
house. Fan air from the air conditioning unit flows over the heating elements which heat the air. This unit
provides heating to the pilot house. Air must be forced over the heating elements before they can be
energized. The thermostat for DH-2 is located overhead in the stairway. A metal door on the unit can be
opened to provide access to controls.
(c) Duct heater DH-3. This unit is a Model CHMS-3-F, three stage type. Three stages of
heating elements, each controlled by a separate thermostat mounted in the provisions storeroom, control
temperature of this heater. DH-3 serves as a preheater for the galley areas and provisions storeroom.
(d) Duct heaters DH-4 through DH-17. Each of these duct heaters is a Model CHMS-3-F.
Wattage ratings vary from heater to heater. Heaters are installed in the ducting according to FIGURE 1-12,
and are controlled by thermostats located in the space they serve.
(2) Unit heaters Three types of unit heaters are utilized on the LCU: horizontal, waterproof
.
horizontal, and explosion proof horizontal.
(a) Horizontal model LUH-B-15-23-34-40. UH-1 and UH-2 are 15 kW units mounted
overhead and forward in the engine room. These are flameless fan-forced types with a spiral metal sheath
fintube electric heating element with built-in overheat protection. Individual adjustable discharge louvers direct
air flow. These units are temperature controlled from separately mounted thermostats.
(b) Horizontal model LUH-B-10-23-34-40. UH-4 and UH-10 are 10 kW units located in the
tunnel. Each unit is identical to UH-1 and UH-2 except for wattage rating.
(c) Horizontal model LUH-B-5-23-34-40. UH-9 and UH-11 provide heat to the machine
shop and engineer's storeroom and are 5 kW models. These heaters contain controls for on/off, LO and HI
settings for temperature on the front panel. The LO setting is approximately 40 and the HI setting is
F
approximately 90 .
F
(d) Waterproof horizontal model 234-U11N-0100K-3090. UH-3 and UH-5 are 10 kW types
used in areas where moisture is present (steering gear room and bowthruster room). These units are overhead
mounted and contain temperature and on/off controls. Adjustable louvered outlet grills may be rotated 90" to
direct air flow up, down, left, or right. An adjustable temperature knob provides a 40100 temperature range.
-
F
A three-position control switch provides for heater on, heater standby, and fan only operation. A red indicator
lamp labeled HEATER ON will light when heating elements are energized. UH-6 is the same type except it is a
Model 234-UllN-0050K-3092, 5 kW type.
(e) Explosion proo horizontal model 236-F015-0052K-4087. UH-8 and UH-8A (paint
f
locker) are explosion proof 5 kW types. These units are overhead mounted, operable in areas where maximum
ambient temperature is 80 . Each heater is controlled by a single externally mounted thermostat. A built-in
F
time delay relay allows the fan to continue to run for about 1 minute after the heater elements are switched off,
in order to cool the elements.
1-88
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