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WALTER KIDDE TRANSFER UNIT - 14217_43
Running Gear Assembly

Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices - index
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(4), motor (7), multibreaker (l), power cable (9), and base (8). The only difference between the models lies in the type of compressor supplied; however, the compressors are interchangeable between the models. A spare parts kit, recharging transfer fittings, and charging fittings are used in conjunction with the units. Motor The repulsion start induction single-phase motor, shown in figure 3-3, is a 115- to 230-volt, 60-cycle, three-fourths horsepower unit. It operates at 1750 rpm and draws 9.8 amperes at 115 volts. This type of motor supplies very high starting torque with a very low starting current. In starting, the motor has repulsion motor characteristics; but at running speeds, it functions as an induction motor since the motor windings are automatically short-circuited and the brushes a r e  l i f t e d  f r o m  t h e  c o m m u t a t o r  w h e n  t he operating speed is approached. Multibreaker The thermal, magnetic multibreaker, shown in figure 3-3, is a two-pole, 115-volt ac, 20-ampere unit installed to protect the power circuit from overloads. In addition, it acts as a manual ON/OFF switch for the operation of the transfer unit. If the multibreaker trips because of a power overload, you may reset it by placing the switch first to OFF and then to ON. Compressor Assembly, Model 4211 Carbon Dioxide Transfer Unit This unit, shown in figure 3-4, is a two-stage, single-action, displacement-type compressor. The running gear assembly actuates the unit and transfers the liquid carbon dioxide from the supply cylinder to the cylinder being recharged. The lower section consists of a cylinder body (6), plunger (7), molded metallic packing (8), spacer (10), and plunger guide (9). The plunger (7), which acts as a piston and transfers the liquid carbon dioxide, is connected to the crosshead of the running gear assembly. The upper section of the unit consists of a cylinder head (2) with an intake and outlet port, an intake valve (11), a discharge valve disc (4), and a discharge valve cap (l). A safety disc and washer, located in the cylinder head behind the safety disc plug (13), releases the carbon dioxide from the compressor when the pressure exceeds the 2650- to 3000-psi range. Figure 3-4.—Compressor Assembly, Model 4211 Carbon Dioxide Transfer Unit. 3-6







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