TM 55-1930-209-14&P-1
CHAPTER 7 VENTILATION, HEATING, AND AIR CONDITIONING SYSTEMS
Section I. General
7-1 General. Ventilation system provides fresh air circulation In the deckhouse and voids with 17 hatches and 10
ventilation fans. The Heating and Air Conditioning System (HAC) controls air temperature in the workshop and dayroom
Equipment specifications, maintenance information and manufacturer's service manuals are in TM 55-1930-209-14&P-16
Section II. Deckhouse ventilation system
7-2 Description. The deckhouse is provided with fresh air circulation by manually operated hatches and electrically
driven fans Fresh air is supplied by opening 17 louvered hatches (Figure 7-1), 10 port and 7 starboard. (Doors may also
be opened.) Air circulation is increased by using six exhaust fans on the deckhouse top (Figure 7-2). These are controlled
by circuit breakers on power panel 2 (Figure 7-3) and motor controllers on port and starboard bulkheads In the ROWPU
space. Fan motors and louvered hatches can be used in different combinations to control air movement The deckhouse
ventilation system also includes electrical wiring, controls, and an electrical emergency shutoff. Installation of this system
is shown in drawings referenced in Appendix A. Major components are listed in Table 7-1.
7-3 Capabilities. This system provides sufficient change of air In the deckhouse to maintain safe working conditions
under normal operations
7-4 Performance characteristics. Each of the six exhaust fans on the deckhouse top moves air at the rate of 14,000
cubic feet per minute (cfm) at 1/2-inch static pressure.
7-5 Operating instructions
7-5.1 Operating controls and indicators
a.
Circuit breakers controlling power to six deckhouse ventilation fans are on power panel 2 on deckhouse starboard
bulkhead forward of sliding door Figure 7-3 shows location of circuit breakers for specific fans.
b.
Six fans are controlled by electric controllers with ON/OFF toggle switches. Raise toggle switches to start fans.
Lower toggle switches to stop fans. Location of controllers is provided in paragraph 7-5.3.1 and In Figure 7-4.
7-5.2 Prestart procedures
a.
Open ventilation hatches as desired to provide fresh air ventilation There are 10 hatches on port and 7 on
starboard. Secure hatch covers in open position with pins and cotter keys.
b.
Make sure that air ducts are free of obstructions and not severely dented or damaged.
c.
Visually inspect fans and motors to make sure they are not damaged, fan blades have sufficient clearance,
motors and fans are properly secured, and electrical connections are tight.
d.
Make sure switchboard circuit breaker P8 is closed to provide power to power panel 2.
e.
Make sure power panel 2 circuit breakers 1 P8 thru 6P8 are closed to provide power to six roof-mounted exhaust
fan motors. Power panel 2 is on ROWPU space starboard bulkhead forward of sliding door.
7-1
