TM 55-1930-209-14&P-16 C-3.2  Voids  ventilation  system  description.    The  void  areas  are  provided  with  forced  fresh  air  ventilation  by electrically driven fans.  Two fans mounted high on deckhouse port and starboard bulkheads provide ventilation to eight void areas; void 1 In bow, voids 2 port and starboard, voids 3 port and starboard, voids 4 port and starboard, and void 5 in stem.  In addition, two fans mounted In ducting at rear of ROWPU space exhaust hot air from voids 4, which contain three diesel generators.  Two louvered hatches with covers and ducting provide fresh air Intake from the  stem  weatherdeck  into  voids  4  -  one  in  port  and  the  other  In  starboard.    The  voids  ventilation  system  also includes air ducts, electrical wiring, controls, and both mechanical and electrical emergency shutoffs. C-3.3 Heating and air conditioning system.  The dayroom and workshop are provided with heated and cooled air from a HAC unit on the forward bulkhead in the workshop .  This unit forces either heated or cooled air through overhead  ductwork  into  the  workshop  and  dayroom.    Bulkheads  In  both  rooms  are  well  Insulated  so  that  a reasonable temperature is maintained.  The control to select either heating or air conditioning (AC) is on upper right side of box containing heating element above the AC unit.  The AC controls are on front of the unit.  The heating unit, located in ductwork above the AC unit, uses an electrically powered element.  Both heating and AC use the blower fan In the AC unit to move air into the dayroom and workshop The thermostat for the heating portion of this system Is on the port bulkhead in dayroom near the refrigerator receptacle Both dayroom and workshop are also equipped with a mushroom-style, nonpowered ventilator in the deckhouse top The AC unit's water cooling condenser is provided seawater from one of two sources.  If seawater pumps In void 2 starboard are operating, and the proper valves open, they provide seawater for cooling the AC condenser and for cooling the chlorination unit.  When these pumps are not operating, seawater for cooling is provided by an AC cooling water pump.  This pump draws seawater from the forward seachest through a set of AC seawater strainers in void 2 port and provides water for cooling both the AC unit and the chlorination unit For details, see TM 55-1930- 209-14&P-2, Seawater Systems. Table C-1.  Preventive Maintenance Checks and Services for Ventilation, Heating and Air Conditioning System (Continued) B - Before D - Daily Q - Quarterly D - During W - Weekly S - Semiannually A - After M - Monthly A - Annually PROCEDURES INTERVAL CHECK FOR AND HAVE EQUIPMENT ITEM ITEM TO BE REPAIRED OR ADJUSTED IS NOT READY/ NO. B D A D W M Q S A INSPECTED AS NECESSARY AVAILABLE IF DECKHOUSE VENTILATION SYSTEM NOTE If the deckhouse ventilation system equipment falls to operate, troubleshoot according to TM 55-1930-209-14&P-16. Report deficiencies and failures to the shift leader or bargemaster.  Use proper forms to describe maintenance or repair problems.  Keep ventilation, heating, and air conditioning system operations and PMCS logs current 1 l l Hatches a.   Make sure hatch covers that are In open position are secured with cotter pins and cotter keys. l l b    Check for damage to watertight hatches   Hatches and light-proof louvers. Rep air as leak necessary C-3