TM 9-4120-371-14
c. Adjust louvers to suit.
NOTE
To pull in maximum of fresh (outside) air, close conditioned air inlet louvers.
2-9. OPERATION IN LO
HEAT MODE
In the LO HEAT mode three thermostatically controlled heaters are activated.
a. Turn mode selector switch to LO HEAT.
b. Turn Temperature control thermostat knob as far as it will go in the INCREASE (warmer) position.
2-15