B-17 Pilots Manual.pdf

7. HEATING~. GLYCOL HEATING SYSTEM. - Cabin heat issupplied by a hot air system in which heat is transferredto the ventilating air from a glycol system inthe No.2 nacelle. Flow of heated air to the cabin iscontrolled by a damper at the pilot's left. Defrosterair is controlled by a red knob in the "v" of the pilot'swindshield and by a control near the outlet in thebombardier's air duct. Fill glycol tank with approvedmixture only; do not dilute with water.CAUTIONDuring starting and ground operation of engines,the cabin heat control must be in the "OFF"or "COLD" position to prevent glycol in thesystem from boiling away.b. AUXILIARY HEATING SYS-TEM. - A similar glycolsystem,installed in the No.3 nacelle ofsome airplanes, supplies eightradiator-fan heating and defrostingunits in various locations inthe airplane. Fan motors arethermostatically controlled andthe flow of heating air is regulatedby a damper at each unit.c. SUIT HEATER OUTLET. -Tenreceptacles for plugging in elec- .tric suit heaters are provided atvarious crew stations. The heatoutput of each suit is controlledby a rheostat on the receptaclebox. .Figure 12 - SUit Heater Recep tac Ie8.::" Heat ing & Vent i h.t ingSystem DuctsG1yco1 System LinesVentCONTROL SETTING VANE POSITIONSCONDITIONWHEN ODNTROLHANDL.POSiTIDNS ARE AS SHOWNBY SOLIO UNES.* I. FULL OUTPUT OF HEATING SYSTE..ENTERSCABIN.2. COLD AIR INLET a.OSED.3. HOT AIR GIRCULATION IN CABIN.HOT* I. FULL OUTPUT OF HEATINGSYSTE"SPILLS OVERBOARD.2. FULL VOLU"E OF COLD AIR ENTERSCABIN.COLD3. COLD AIR cuiCULATION IN CABIN.* ,. FULL OUTPUT 'OF HEATING SYSTE"SPILLSOVERBOARD.2. COLe AIR INLET a.OSED.OFFCABIN AI.3. NO C'RCULATION IN CABIN.*TM£ G\.YCQI. SYST... """ATES COOTINUOUSLYR",RIX.US OF THE POSIYlON OF HEAT'NG CONTROLS. THE FLOW OF HOT AIR IIIIST THEREFORE BE UN-RESTRIOTED TO PRE-_T DAMAGETO THE GLYCOLSYST"'.Figure11 - Heating System Diagram8------------------