underwater lights, ECS circulation motors, and the hotplate. All other loads are 

 supplied 110 volt power by a pair of step down transformers. The oxygen con- 

 troller turns off internal electrical circuits if the oxygen level increases 

 beyond a pre-set point. A 12 volt battery pack will supply emergency power 

 for the CO2 analyzer, oxygen controller, and CO2 removal subsystem for 12 hours. 

 The emergency power is automatically turned on if the A.C. power fails. 

 Emergency lighting is provided by battery powered waterproof lanterns. Fig- 

 ure 6 is a block diagram of the minitat electrical system. 



mhi)'c^^ 



EXTERNAL LIGHTS 



d3' 



OWER ,^— N ^ 



il Al I?- 



JNG PU MP( H EATING PUMP H / JC 



220V 220V I f" 



110V 110V 



COOLING PUMPI heating pump 

 HOTPLATE 



jCOj SCRUBBER 

 FAN MOTOR 



STANDBY POWER 



CONTROL CONTACTORS" 

 ECS COMPRESSOR 

 OVEN 



CO2 SCRUBBER 

 COOLING PUMP 

 HEATING PUMP 



<>? 



HOT WATER HEATER 



O, CONTROLLER 



CO, ANALYZER 



tlh 



CONTROL CONTACTOR 



' 2 ..^.^^., REFRIGERATOR , 



INVERTER I NVERTE R ^-^ AUXILIARY j 



I I 1 I 1 I ( jiC02 SCRUBBER j 



] ' J—" \r^FAN MOTOR j 



•AC POWER TURNED OFF WHEN PO2 EXCEEDS PRESET LIMIT 

 DC POWER TURNED ON WHEN AC POWER IS TURNED OFF 



^220V. 30 , 3WIRE. 60HZ 



220V, 10, 60HZ 



110V, 10,6OHZ 



FIGURE 6.— ELECTRICAL SYSTEM BLOCK DIAGRAM 



The primary communications system is a Bogen intercom with master stations in 

 the pressure vessel, and the support ship and a remote station in the wet room. 

 A Stromberg-Carlson sound powered telephone provides backup communications in 

 case of power failure. A wide angle television camera and an open microphone 

 are provided for observing the aquanauts. A hydrophone connection from the 

 open microphone allows the aquanauts to talk to divers in the water outside the 

 minitat. Figure 7 is a schematic diagram showing the location of the communi- 

 cations system. 



The minitat is equipped with a 10 gallon electric water heater (with a two 

 hour recovery time), a hot water shower, a sink, and a marine-type toilet with 

 a macerator and a holding tank. A 200 foot long polyvinal chloride pipe will 

 carry run-off from the holding tank to a site away from the minitat. Fresh 

 water is supplied to the minitat from the support ship via the umbilical. 



SURFACE SUPPORT 



The surface support vessel for the minitat during TEKTITE II was the R/V 

 UNDAUNTED. It was operated by the Cape Fear Technical Institute under a con- 

 tract from the Office of Sea Grant Programs, National Science Foundation. The 

 vessel was built for the U. S. Navy in 1944, as a seagoing tug, and converted 



III-7 



