TM 55-1930-209-14&P-1
Table 7-3. Major Components of Heating and Air Conditioning System
Component
Quantity
Function
Location
5-ton marine air
1
Provides cooled air for
On workshop forward
conditioner
workshop and dayroom
bulkhead
In-line heating
1
Heats air in workshop
In air plenum above AC
element
and dayroom
unit in workshop
Air outlets
2
Directs air flow
1 in workshop; 1 in
dayroom
Air ventilators
2
Allows air to exit from
On deckhouse top, 1 in
workshop/dayroom
workshop, 1 in
dayroom
Thermostat
1
Controls heating element
On dayroom bulkhead
near refrigerator
receptacle
HEAT/COOL/
1
Selects heating or cooling
On side of heating
OFF switch
element housing above
AC unit in workshop
AC control unit
1
Selects AC or fan only
On front of AC unit in
workshop
Cooling pump
Controls cooling pump
On centerline bulkhead
motor controller
in void 2 port
c.
Heating element controls (Figure 7-10). On dayroom port bulkhead aft of refrigerator. Thermostat control on
upper portion of control box sets temperature desired from heating element. Bottom portion of control box
displays a thermometer indicating temperature in the dayroom.
NOTE
The following controls and indicators are part of the seawater system but are
critical to operation of the AC unit. For details see TM 55-1930-209-14&P-2
Seawater Systems.
d.
Seawater valves SW3 and SW27 in void 2 port (Figure 7-11). SW3 controls water flow from forward seachest to
seawater strainer 3 and SW27 controls flow of cooling water from seawater strainer 3 to cooling water pump.
e.
Seawater valve SW28, in void 1 underneath AC unit (Figure 7-11). Controls flow of cooling water from cooling
water pump to AC unit.
f.
Seawater pressure gauges and associated valves SW35 (seawater strainer 3 pressure in) and SW36 (seawater
strainer pressure out) in void 2 port. Gauges show seawater pressure going into strainer 3 and seawater
pressure coming out of strainer 3. A pressure differential of 2 pounds per square inch (psi) or more indicates that
the strainer must be switched and the dogged strainer basket cleaned. See TM 55-1930-209-14&P-2, Seawater
Systems, for details. Valves control water pressure to pressure gauges and should normally remain open.
g.
Seawater valve SW47 in void 2 port (Figure 7-11). Controls flow of seawater from cooling pump to chlorination
unit.
h.
Seawater valve SW48 in void 2 port. Controls flow of seawater from seawater pumps to air conditioning unit and
chlorination unit.
i.
Cooling water pump controller on centerline bulkhead in void 2 port (Figure 7-11). Controls electrical power to
cooling water pump.
7-18
