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THEORY OF OPERATION
THEORY OF OPERATION (cont) - TM-10-4520-262-12P_33

TM-10-4520-262-12P Space Heater Convective Manual
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TM 10-4520-262-12&P                                                 0003 00 0003 00-2 Placing the ON/OFF switch of the in-tent controller in the ON position sends a signal to the power control assembly (1) as well as to the heater control assembly (2) energizing the system. At this point the “heater on/on-hold” advisory light (3) on the in-tent controller will illuminate, indicating the heater has begun operation. After a wait of five seconds a visual audible function check of the in-tent controller is made. The battery charging light, battery charged light and system fault light are illuminated with the audible tone for approximately two seconds. A battery pack (4) is used to supply power to the heater assembly (1) and facilitate burner ignition until the thermoelectric generator (TEG) (5) begins generating power. The power drawn from the batteries is replaced by the TEG while the heater delivers heat to the shelter. Once power is applied to the system, the heater control assembly (2) sends a signal to the fuel solenoid valve assembly (6), opening the valve and allowing fuel to flow through the sediment strainer (7) to the float assembly (8). Power is supplied to preheat the glow plug (12). Fuel is then pumped in short pulsating bursts by the fuel pump (9) to the burner head assembly (10), where it is vaporized from the heat of the glow plug.   Air that is drawn through the combustion air inlet is mixed with the hot vaporized fuel providing oxygen for flame ignition. Heat produced from this combustion is converted to electrical power by the thermoelectric generator (TEG)  (5). The TEG provides electricity which is used to recharge the batteries. When the batteries are charging, the “battery charging” advisory light (14) on the in-tent controller assembly illuminates. The heater continues to run as the batteries recharge. When the batteries (4) are fully recharged, the “battery charged” advisory light (15) on the in-tent controller assembly illuminates and the “battery charging” light (14) is extinguished.  At a specified temperature measured at the TEG, the heated air blower assembly (16) is engaged and cold air is drawn from the shelter through the air supply duct (17)  and forced through the heat exchanger (18) at the outlet end of the heater. The shelter air is heated and forced out the air return duct (19) into the shelter as heated air. As heated air is supplied to the shelter, the temperature inside the shelter rises. This temperature is monitored by a sensor (20) on the in-tent controller assembly. When the shelter temperature reaches the value set on the “lower/higher” control (21) on the in-tent controller assembly, a signal is sent to the heater. The fuel pump and combustion air are slowed down reducing the heat supplied to the shelter. Air continues to circulate through the shelter via the heated air blower assembly (16) and the “At Setpoint” advisory light (22) illuminates.   If the shelter temperature exceeds approximately 90 degrees F, the in-tent controller will shut off the heater. The heater on/ on hold light will remain on. When the shelter cools the heater will  begin a normal start cycle. Heater operation is terminated by switching the ON/OFF switch (23) on the in-tent controller to the OFF position. The fuel solenoid valve (6) is closed and all fuel flow to the burner assembly (10) ceases. When all advisory lights are extinguished, the heater is shut down and can be moved or left in place for another operational cycle.







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