TM 9-2320-361-10 2-6. SPECIAL PURPOSE KITS CONTROLS AND INDICATORS (Contd) Key Item and Function 9 10 Power Plant Heater Shutoff Cock is opened (turned left) to let fuel enter power plant heater combustion chamber. Personnel Heater Shutoff Cock is opened (turned left) to let fuel enter personnel heater combustion chamber. Key 11 12 13 Item and Function Alcohol Evaporator Bottle stores alcohol used to keep air lines from freezing during cold weather operations. Inlet Coolant Shutoff Cock is opened (turned left) to let coolant from power plant cooling system enter heating chamber of power plant heater. Outlet Coolant Shutoff Cock is opened (turned left) to let coolant from heating chamber of power plant heater enter power plant cooling system. 2-25